No preview available
HomeMy WebLinkAboutWWP273555ENGINEERING . PLANNING . ENVIRONMENTAL SCIENCES 1019 39th AVE SE, SUITE 100 PUYALLUP, WA 98374 T.253.604.6600 F.253.604.6799 www.parametrixxom TECHNICAL MEMORANDUM Date: June 21, 2011 To: Dave Christensen John Hobson Ron Straka Allen Quynn From: Jeff Coop, P.E. Subject: Upper Failure Site Options cc: Jenna Friebel, CJ Shin (Soil and Environmental Engineers) Project Number: 218-1779-037 Project Name: Thunder Hills Creek INTRODUCTION Thunder Hills Creek, located within the City of Renton, begins northwest of the intersection of Grant Avenue South and South 18th Street, flows to the northwest, crosses under I-405 through a storm drain, and continues through several ditches and pipes and a three -sided concrete flume before its confluence with Rolling Hills Creek. Thunder Hills Creek varies from an open stream in riparian areas to concrete channels to enclosed storm drains and pipe systems. The portion of Thunder Hills Creek of concern is located within a steep confined ravine just southeasterly of I-405. A sanitary sewer was constructed along a portion of the stream in approximately 1964. Based on record drawings, a maintenance access road along the existing sanitary sewer Was generally not constructed with the original construction of the sanitary sewer. However, a maintenance access road was constructed along a portion of the stream along the Berkshire Apartments. The access road is approximately 800 feet in length and extends from the Washington State Department of Transportation (WSDOT) 1-405 right-of-way upstream to the parking lot for the Berkshire Apartments. When constructed, the Berkshire Apartments were called the Country Hills Apartments. Based on contours on record drawings for the Country Hills Apartments, this access road existed as of 1980. It is unknown when the access road was constructed. The width of the access road varies by location and condition. The width varies from 9 feet to 20 feet. In November 2008, a storm drain conveying the upper portion of Thunder Hills Creek failed in the vicinity of the Berkshire Apartments. There was erosion in the vicinity of the storm drain and along the sanitary sewer access road. In response to the failure, a section of the storm drain was replaced. In November 2009, sediment plugged the storm drain inlet, the creek flowed overland, and extensive erosion occurred. In November/December 2009, City of Renton maintenance crews unplugged the storm drain inlet and constructed a trapezoidal overflow channel above the existing storm drain using large rock and quarry spalls. The rock and quarry spalls that were placed in the eroded areas as well as at the inlet of the existing storm drain. This was done to minimize the potential of further erosion, protect the access road, protect the existing sanitary sewer line, and protect the repaired storm drain. TECHNICAL MEMORANDUM (CONTINUED) In addition, the maintenance access road downstream of the Berkshire Apartments toward I-405 is also unstable. Based on record drawings dated 1984, the city constructed gabion walls along the left bank of Thunder Hills Creek in various locations along the access road. However, these gabion walls have failed in several locations, and portions of the access road have washed out. Thunder Hills Creek, in the vicinity of the Berkshire Apartments and down to I-405, continues to be subject to erosion and the sanitary sewer line, storm drain, and access road are at risk of being damaged. This memorandum summarizes options that have been considered to protect the existing sanitary sewer. Mitigation for stream and riparian impacts due to the emergency riprap placement and permitting associated with the preferred alternative identified below are discussed in a separate technical memorandum (April 15, 2011, Parametrix). In addition, restoration and protection of the maintenance access road have been considered because the road is needed to access the sanitary sewer, or the sanitary sewer is located under the access road, depending on the location of the sanitary sewer. Due to changes in soils and topography, the project area has been divided into the Upper Failure Site along the Berkshire Apartments, and the Lower Reach between the Apartments and I-405. Figure 1 shows the project location. Figure 2 shows the areas of impact. Figure 3 shows the limits of the project survey and how the project has been divided. The City has scheduled a television inspection of the existing sanitary sewer in 2016. Because the condition of the existing sanitary sewer will not be known until the inspection is performed, this analysis focuses on short-term solutions to address the stability of the sanitary sewer until 2016. After the television inspection is performed, long-term options will be developed based on the condition of the existing sanitary sewer, replacement options, and alignment options. EXISTING CONDITIONS Watershed Description The headwaters of Thunder Hills Creek are located to the southeast and upstream of I-405. Upstream of 1-405, . Thunder Hills Creek is contained in a ravine through the project area. Upstream of that the stream is still confined within a steep valley with a narrow floor. The headwaters of the stream are developed with residential development of varying densities. Downstream of the project area ravine, Thunder Hills Creek flows under I-405 and then flows through several ditches and pipes and a three -sided concrete flume before its confluence with Rolling Hills Creek. The lower portion of the watershed is intensely developed for commercial land uses and has little to no natural riparian vegetation. Rolling Hills Creek is a tributary of Springbrook Creek and ultimately the Green River. Habitat and Fish Use Thunder Hills Creek and Rolling Hills Creek do not support anadromous fish. The project reach supports cutthroat trout, western brook lamprey, sculpin, and threespine stickleback (WSDOT 2008a). Springbrook Creek, which is approximately 1.5 miles downstream, is the first resource that supports Chinook, coho, and Steelhead Trout. Based on the WSDOT Environmental Assessment of this watershed, I-405 acts as a complete upstream fish passage barrier due to the water velocity in the storm drain during high water flows and the report mentions numerous additional blockages to fish migration throughout Thunder Hills Creek (WSDOT 2008a). City of Renton 218-1779-037 Upper Failure Site Options 2 June 21, 2011 n Figure 1 (� Thunder Hills Creek o N aoo Vicinity Map SCALE IN FEET , .�J PROJECT AREA OF IMPACT EXCESS MATERIAL PLACED AFTER 2009 OVERFLOW CHANNEL CONSTRUCTION :y1 EXISTING THUNDER HILLS CREEK CULVERT \ \ + i �i i +_', •'�:�, 36's DIA INSIDE 4a%DIA PIPE EXISTIN ANITARY SEWERI XI N RIPRAP L M T i �� ':\';fir=,\�=N �';•\ \ ' :r `.fir z •\ \ \,\ j EXISTING STORM DRAIN BASIN • \ _ } \4 : _ EXISTING THUNDER HILL: CREEK CULVERT, 48' DIA RIPRAP AT CULVERT aG GRAVEL ACCESS ROAD THUNDER HILLS -FT FROM CULVERT ASSUME CULVERT IN STORIC STREAM ' IMPACTED AREA =401 SO FT, AREA IMPACTED DURING 2008 \\��`:,^�' '1`•t."y�(\\1.%L'\i �' POTENTIA ? _ , �•: n, , r �� SITE \ =-\'y ��� py 4' •\ AND 2009 EMERGENCY ACTIONS THAT WAS NOT \ �:=\;,•\;'C' Y��.: j ,,TAt PREVIOUSLY DISTURBED. \' < EXISTit WALLS LEGEND — PARCEL LINE��: \' — — — — — — — UTILITY EASEMENT LINE EXISTING RIPRAP LIMITS Figure 2 Thunder Hills Creek N Area of Impact EXISTING WSDOT CULVERT J GPR GPR KJ .. GPR \ / EXISTING SANITARY SEWER) ` \ LOWER REACH \ \ \ 1f \ \ 1 \ I GPR 6 OVERALL GROUND SLOPE TO \ ; �'•'�rLIMITS OF RIPRAP PLACED — TOE �• � "mot TOE OF RIPRAP: 100 % GPR 6`,r\ +N a >�7� DURING 2008 AND 2009 EMERGENCY ACTIONS \ OVERALL GROUND SLOPE, STORM DRAIN TO NEAR TOP OF SLOPE: 10% \ ,l 1t t GPR 7 \` \' , V GPR9 EXISTING STORM DRAIN :-GPR 9 V. --- ---��\,mow\2� �:`'• t Il t p GPR 11 LEGEND: GPR GROUND PENETRATING RADAR SECTION LOCATION l y.` GEOTECHNICAL SECTION LOCATION 'arametrlx UPPER FAILURE SITE rigureThunder s �\ Thunder Hills Creek 0 N fi0 Upper Failure Site ® and Lower Reach SCALE IN FEET TECHNICAL MEMORANDUM (CONTINUED) It is not likely that the stream supported salmon spawning and migration because of the stream slope, the associated high velocities, and the sandstone layer within the project area. Within the Upper Failure Site, the sandstone layer is relatively deep and is covered with granular material. However, the sandstone layer has a drop of over 26 feet and a slope of over 26 percent at the transition to the Lower Reach. Both of these criteria exceed limits for fish passage. Within the Lower Reach, the sandstone layer is exposed within the normal flow portion of the stream channel. Because of the smooth walls and high velocities within the sandstone channel, spawning and rearing habitat could not be sustained. Site Conditions The Upper Failure Site begins approximately 355 feet upstream of the I-405 storm drain and continues approximately 280 feet upstream. The Upper Failure Site is generally the same as the area where the riprap was placed in November/December 2009 (see Figure 2). In the Upper Failure Site, Thunder Hills Creek has an overall gradient along the riprap of approximately 10 percent from the top of the existing 48-inch-diameter storm drain to the beginning of the steep slope. The flow path then has a slope of approximately 100 percent from the top of the slope to the toe of the slope near the discharge point of the existing storm drain. The stream channel has a high point in the riprap in an effort to route water through the existing storm drain. However, based on observations by Parametrix on November 1, 2010, and by the City on December 15, 2010, the inlet to the existing storm drain was submerged, and flow was routed along the riprap above the pipe. Based on these observations, the existing storm drain appears to have limited capacity and may be plugged. The storm drain was not able to be television inspected when field services were performed for the project. The Lower Reach is located immediately downstream of the Upper Failure Site, where the stream is in a ravine with steep sidewalls. The channel is incised and largely contained in weathered sandstone with very little in - stream habitat or gravel. The right bank is made of sandstone and is relatively stable except where noted in the geotechnical memorandum. The existing sanitary sewer and access road are located along the left bank (looking downstream). Based on record drawings, portions of the left bank have been armored with gabion baskets, which were intended to protect the unstable loose materials associated with the historic access road. Many of the gabion baskets are failing. Sanitary Sewer Based on information provided by the City, the existing sanitary sewer is 12-inch-diameter pipe. However, record drawings of the original construction indicate the pipe is 10-inch-diameter asbestos cement. There are no existing manholes on the sanitary sewer within the project area. Connections to the existing sewer from the Berkshire Apartments were made using tees with cleanouts. The sanitary sewer was not able to be television inspected during site survey. Consequently, the condition of the line is unknown. Also, because of equipment limitations, survey crews could not locate portions of the sanitary sewer within the project area. Consequently, the sewer location shown on the project base map is based on data obtained at selected locations. Ground penetrating radar (GPR) was used at eleven sections as shown on Figure 3. The location of the existing sanitary sewer was interpolated between the GPR sections and plotted on geotechnical cross -sections to determine the potential sewer elevation relative to the soil profile. Based on the geotechnical data obtained and the field locating results, the existing sanitary sewer appears to be located within the layer of weathered or unweathered sandstone where geotechnical data was obtained. Where the sanitary sewer is located in the sandstone layer, it is anticipated that the joints of the existing sewer would not be impacted by lateral stream migration. Also, because of the relatively steep slope of the existing sewer, it is anticipated that there is limited corrosion in the pipe. The main cause of corrosion of sewers conveying domestic wastewater is the accumulation of hydrogen sulfide gas where there is blockage in the sewer or the sewer has a relatively flat slope. City of Renton 218-1779-037 Upper Failure Site Options 6 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Existing Storm Drain An attempt was made to television inspect the existing storm drain that conveys Thunder Hills Creek. However, blockage was encountered in the existing pipe, and only a limited section of pipe could be inspected. Consequently, the overall pipe condition and alignment could not be determined. Based on site observations by the City and by Parametrix, the existing storm drain appears to be plugged and its capacity significantly reduced. It is not currently known if the pipe was installed following the profile of the sandstone layer or in a trench cut into the sandstone layer. If the pipe was installed following the profile of the sandstone layer, the pipe would have a steep slope at the end where the sandstone layer has a significant drop. If the pipe was installed in a trench within the sandstone layer, this would likely have taken a significant amount of time because of the time and effort required to excavate into sandstone. Access Road The segment of the existing access road located adjacent to the Upper Failure Site and along the Berkshire Apartments appears stable. This portion of the access road was used to access the Upper Failure Site to perform the storm drain repairs and emergency riprap placement in 2008 and 2009. The segment of the access road located between the Upper Failure Site and the Lower Reach has failed and can only be traversed by foot. This segment of access road could also be traversed by small construction equipment if it was improved and stabilized by filling in voids and clearing vegetation. Restoring the segment of the access road located at the failure site for use by heavy maintenance or construction equipment would be costly since a retaining wall would be needed to limit encroachment into the stream. The condition of the access road along the Lower Reach varies. The access road is severely degraded in locations where gabions along the left bank of the stream have failed. The Lower Reach does not appear to be readily accessible from I-405. Consequently, this memorandum focuses on options for the Lower Reach to stabilize the access road and temporarily protect the existing sanitary sewer until the television inspection is performed in 2016 and a long term solution identified based on the inspection results. Options were considered that would allow relatively small construction equipment to access the Lower Reach from the Upper Failure Site. UPPER FAILURE SITE OPTIONS CONSIDERED Four options were considered to permanently stabilize the Upper Failure Site and address the mitigation required for placing the riprap during the emergency response (see Table 1). A detailed description of each alterative is provided in the following sections. Table 1. Summary of Upper Failure Site Options Design Element Option A — Option B — Stream Option C — Option D — Full Do Nothing Construction Repair/Replace Restoration for Existing Storm Drain Fish Passage Existing Riprap Leave in place. Temporarily remove riprap to Leave in place. Remove. perform channel grading. Install liner over any remaining loose in situ material. Install vegetation along normal flow portion of channel. Install riprap along high -flow portion of channel. Table Continues City of Renton 218-1779-037 Upper Failure Site Options 7 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Table 1. Summary of Upper Failure Site Options (Continued) Design Element Option A — Option B — Stream Option C — Option D — Full Do Nothing Construction Repair/Replace Restoration for Existing Storm Drain Fish Passage Existing High Leave in place. Remove. Leave in place. Remove. Point Existing Storm Leave in place. Remove/abandon. Replace/repair. Remove/abandon. Drain Existing Sanitary Leave in place. Leave in place. Leave in place Leave in place Sewer Stream Habitat On -site mitigation. On -site mitigation. Provide in On -site mitigation. On -site mitigation; bench areas outside of low -flow limited design life due channel and beyond edges of to velocities and slopes design water surface elevation through sandstone where feasible. layer. Existing Access Leave as is. Reconstruct as part of stream Reconstruct as part of Reconstruct as part of Road construction. storm drain channel restoration repair/replacement. construction. Upper Failure Site Option A — Do Nothing Option A would leave the existing riprap in place, leave existing grading as -is, leave the existing storm drain as - is, and would provide on -site mitigation for placement of the riprap. On -site mitigation would be performed upstream of the inlet to the existing storm drain. See the mitigation memorandum (Parametrix 2011) for further information about off -site mitigation. Flows that cannot be conveyed through the existing storm drain are conveyed through the voids in the riprap and along the top of the riprap. Although there may be finer grained soils below the riprap that could be transported out of the riprap, the site appears stable for current conditions. Option A includes annual inspection of the riprap and site stability until the television inspection in 2016. Any long-term options for the riprap at the Upper Failure Site would be addressed after the television inspection. Option A provides the lowest cost solution for the Upper Reach because there are no construction activities in the Upper Reach. Upper Failure Site Option B — Construct a Normal Flow Channel Option B would remove or abandon the existing storm drain and re -grade the'stream channel from approximately 46 feet upstream of the existing storm drain inlet to the top of the riprap near the storm drain outlet. The new stream channel would be the sole conveyance through this reach. Approximately 245 feet of the new channel would have a slope of 2 percent and the high point in the profile would be removed. This portion of the stream channel would be restored with natural streamgravel substrate, a floodplain terrace, and native plants in the riparian area. At the downstream end of this reach, the stream would transition to a reach with a slope of approximately 40 percent, which matches the existing slope of the bedrock. This lower reach is approximately 75 feet long and would continue to be lined with riprap for long-term stability. Option B would be constructed by temporarily removing the existing riprap so that a liner could be installed over any loose material (historic fill). Once the site was stabilized the new open channel would be constructed using the retained riprap. Option B would also include restoration of the access road since that would be required for construction of the channel. City of Renton 218-1779-037 Upper Failure Site Options 8 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Option B has the advantage of providing on -site stream restoration for the area impacted during the emergency riprap placement. Similar to existing conditions, Option B would not provide fish passage because of the steep slope at the end of the riprap. Upper Failure Site Option C — Repair/Replace Existing Storm Drain Option C would leave the existing riprap and high point in place and add additional riprap to the Upper Failure Site as needed to stabilize the stream. The existing storm drain pipe that historically conveyed the stream in this reach would be repaired or replaced and would continue to convey most of the stream flows except during flood events. Option C would require off -site mitigation for the riprap placed during the 2008 and 2009 emergency responses and for additional riprap placed to stabilize the stream. Option C would include restoration of the access road since that would be required for construction equipment access for the storm drain repair/replacement. For the short-term, Option C has a relatively high cost for the storm drain with little benefit to the existing sanitary sewer. Based on observations by the City and Parametrix, the riprap in the Upper Failure Site appears to be stable for the current storm drain condition. Repairing/replacing the existing storm drain as part of a long-term solution will be evaluated after the existing sanitary sewer is television inspected in 2016. If the City wishes to further consider replacing or repairing the existing stonn drain, the existing debris will need to be removed from the pipe and the pipe television inspected to determine the condition, size, and material of the pipe. The television inspection will also give an indication of changes, if any, in the horizontal and vertical alignment of the pipe, which will be important if a trenchless technology is desired. If the existing storm drain is replaced, the opening at the end near the riprap drop-off will need to be exposed to allow for construction and a free discharge at the end of the pipe. Upper Failure Site Option D — Full Restoration for Fish Passage Option D would remove all of the riprap placed in the stream during the 2008 and 2009 emergency responses, remove the existing storm drain pipe, remove historical fill, and reconstruct an open channel using large rounded river rock. Grade control structures would not likely be used because the slope and velocities would reduce their long-term viability. The constructed stream would have an overall slope of approximately 11.4 percent. Construction of this channel would require extensive grading, which would extend into the toe of the valley wall and would likely extend into the sandstone layer. Option D would provide the greatest restoration of the stream since all material placed historically as well as during emergency riprap placement would be removed. Sections of storm drain below the riprap would be plugged. Option D would provide on -site stream restoration. Option D has a high level of risk because the underlying sandstone layer may preclude the long-term stability of constructed stream 'restoration measures. Such measures could wash out during high -flow events. Also, Washington State Department of Fish and Wildlife (WDFW) has published guidelines for determining natural fish passage barriers. For resident cutthroat, the upper boundary gradient is 20 percent (WDFW 2003). This gradient is exceeded at the northerly (downstream) end of the Upper Reach. Based on the stream gradient, the underlying sandstone layer, the gradient of the underlying sandstone layer, and the potential for erosion, it was determined that restoring the Upper Reach to provide for fish passage was not feasible. LOWER REACH OPTIONS CONSIDERED Short-term options for protecting the existing sanitary sewer in the Lower Reach are discussed in the following sections and summarized in Table 2. These options were identified based on observations by City staff on December 15, 2010, and by Soil and Environmental Engineers, Inc. on January 27, 2011. These options were identified because the existing sanitary sewer is generally not located immediately adjacent to the stream bank and is scheduled for TV inspection in 2016. City of Renton 218-1779-037 Upper Failure Site Options 9 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Long-term options for the existing sanitary sewer will be developed after the television inspection is performed in 2016. If the existing sanitary sewer is in acceptable condition and does not need to be replaced, then an evaluation should be performed to determine if a more permanent wall should be constructed or the sanitary sewer located in an alternative alignment. If the existing sanitary sewer is not in an acceptable condition, then replacing the sewer in a similar or new alignment or repairing the sewer with a trenchless technology would likely be considered. Stabilizing the Lower Reach for a long-term solution would need to be considered at that time. Table 2. Summary of Lower Reach Options Option C - Option D - Replace Option B - Replace Replace Existing Existing Gabion Existing Gabion Gabion Baskets Baskets with an Element Option A - Do Nothing Baskets with a Rockery Armored Slope Impacts to Ongoing gabion failure likely Areas not protected Areas not protected Areas not protected Existing Access with subsequent erosion along may erode in future. may erode in may. erode in future. Road road edge. future. Impacts to Potential plugging if access Potential plugging if Potential plugging if Potential plugging if Existing WSDOT road washes out or east bank new areas erode or new areas erode or new areas erode or Storm Drain at fails. east bank fails. east bank fails. east bank fails. 1-405 Potential damage to 1-405 fill embankment. Potential flooding of 1-405. Overflow riser at Not included. Install. Install. Install. WSDOT Storm drain at 1-405 Amount of 18,300 cubic feet.a Not applicable unless Not applicable Not applicable Erosion new areas erode. unless new areas unless new areas erode. erode. Inspection Every 2 months between Semiannually to review Semiannually to Semiannually to Frequency October and May. status of unprotected review status of review status of areas. unprotected areas. unprotected areas. Stabilization Not Applicable. Gabions. Rockery. Not evaluated; not Material considered feasible. Advantages No construction costs. Stabilize currently Does not rely on Not evaluated; not eroded areas at wire baskets for considered feasible. relatively low cost. long-term stability. Disadvantages Potential loss of access road Cost incurred prior to Earthwork; new Would require along sanitary sewer. 2016 television rockery below extensive earthwork Potential loss of sanitary sewer inspection. ordinary high-water and likely changing if east bank fails and stream mark (OHWM). the cross -slope of realigns. the existing access Potential emergency repairs road. during winter months. Potential water quality violations and fines. Typical Not Applicable. See Attachment B. See Attachment B. Not developed; not Cross -Section considered feasible. Permitting Not Applicable Would require a Would require an Not evaluated; not Issues/Mitigation Hydraulic Project HPA and local considered feasible. Approval (HPA) and critical areas local critical areas permits.' perm its. b a Amount of erosion assumes washout of approximately half of access road along the Lower Reach and loss of embankment material along the east bank overhang material as discussed in the geotechnical memorandum. Access road volume reflected is based on 360 linear feet, 7.5 feet wide, 4 feet high. Loss of east bank overhang materials based on 250 linear feet, 10 feet wide, 3 feet high. b Refer to Parametrix technical memorandum dated 04/08/2011 City ojRenton 218-1779-037 Upper Failure Site Options 10 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Lower Reach Option A — Do Nothing Option A would not take any action to replace the failing gabion baskets, but does include quarterly inspection of the existing gabions to monitor their condition prior to the television inspection scheduled in 2016. This would enable the City to identify locations on the access road that may need to be stabilized until the television inspection is performed. The existing access road and gabion baskets would continue to be subject to erosive action by the stream, and there is a high potential for continued failure of gabion baskets and loss of access road material, which could result in failure of the existing sanitary sewer depending on the extent of erosion and the location. Also, there is the potential for plugging at the existing WSDOT storm drain under I-405 and flooding of I-405 without a provision for overflow. Costs for these types of losses are not included in Table 3. The cost to perform the quarterly inspection is also not included in Table 3; however, it is anticipated that the inspection could take up to 2 hours of staff time to perform each inspection. Under Option A, there is no projected capital cost. Lower Reach Option B — Replacing Existing Gabion Baskets Option B includes replacing the existing gabion baskets that have failed with new gabion baskets in their current location. The condition of the existing gabions varies along the stream. Some gabions have failed. Some gabions are in the process of failing due to corrosion of the wire mesh. Gabion failure results in loss of the retained aggregate and the access road material. Some gabions are still intact and some are leaning which indicates lateral movement of the hillside along the access road. Additional gabion failure and loss of access road material has occurred from fall 2010 through winter 2011. Uncoated gabion wire can also contribute metals into the stream as the wire corrodes. The stream bank erosion along the left bank is encroaching on the alignment of the sanitary sewer. In addition, the sanitary sewer is also potentially subject to damage if the east (right) bank of the stream fails. The east (right) bank, which is on the opposite side of the access road, has several locations where soil overhangs the stream channel. If the soil in the overhang areas fails and falls into the stream, the soil could block the stream flow because of the large soil volume. This blockage in the stream could cause the stream to realign to the looser materials along the access road. If the stream washes out the access road material, it could potentially wash out bedding material for the sanitary sewer, which could result in pipe damage and/or failure and subsequent discharges of sanitary sewer flows. Stabilizing the right bank was not evaluated because technical and permitting factors would result in a higher cost than stabilizing the left bank. The advantage to Option B is that it provides a relatively low cost short-term solution. The gabions are accessible by relatively small construction equipment, which is an important consideration due to access constraints. Option B also includes excavating at least two test holes along the alignment of the sanitary sewer to confirm if the sanitary sewer is located within the sandstone layer. For Option B, it is anticipated that minor grading could occur along the west bank between the Upper Failure Site and Lower Reach to restore access between these two sections because there does not appear to be adequate access to the Lower Reach from I-405. Access would need to be restored to accommodate smaller construction equipment to transport materials to the Lower Reach. If large equipment was used, a retaining wall would likely be required, which would increase the costs reflected in this technical memorandum. City of Renton 118-1779-037 Upper Failure Site Options ! 1 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Lower Reach Option C — Replace Existing Gabion Baskets with a Rockery Option C includes removing any remaining gabions and constructing a rockery the full height, minimum, of existing gabions. Although rockeries can provide erosion control, rockeries do not provide lateral stability. For Option C, it is anticipated that minor grading could occur along the west bank between the Upper Failure Site and Lower Reach to restore access between these two sections because there does not appear to be adequate access to the Lower Reach from I-405. Access would need to be restored to accommodate smaller construction equipment to transport materials to the Lower Reach. If large equipment was used, a retaining wall would likely be required, which would increase the costs reflected in this technical memorandum. Lower Reach Option D — Replace, Existing Gabion Baskets with an Armored Slope Option D would decrease the slope on the edge of the access road and install a slope armoring system. However, there could be a significant cut within the access road to accommodate the system, depending on the manufacturer's requirements. Also, an armored slope protects against erosion but does not provide lateral stability which is necessary for the ongoing stability of the sanitary sewer. Because Option D is more extensive than Options B and C, it is not likely that minor grading for construction equipment access between the Upper Failure Site and the Lower Reach would be adequate. Consequently, a retaining wall would likely be required. CONSTRUCTION COSTS Table 3 presents the opinion of probable construction cost for each option considered for the Lower Reach. Table 3. Conceptual Opinion of Probable Construction Costs for Lower Reach Options Option B - Option C - Replace Option D - Replace Option A: Do Replace Existing Existing Gabion Baskets Existing Gabion Baskets Element Nothing Gabion Baskets with a Rockery with an Armored Slope One overflow riser $0 $14,650 $14,650 $14,650 (WSDOT cost) On -site mitigation for $2,000 $2,000 $2,000 $2,000 Upper Reach emergency riprap placement Off -site mitigation for Not applicable Not applicable Not applicable Not estimated; not Lower Reach considered feasible Restore access from Not applicable Incidental grading Incidental grading Not estimated; not Upper Reach considered feasible Remove existing gabion Not applicable $5,600 $5,600 $5,600 baskets where failed and rock Install new gabion baskets Not applicable $21,600 Not applicable Not applicable and rock where replacing failed gabions Install rockery Not applicable Not applicable $12,600 Not applicable Install armored slope Not applicable Not applicable Not applicable Not estimated, not considered feasible TOTAL: $2,000 $43,850 $22,250 Not estimated; not considered feasible City of Renton 218-1779-037 Upper Failure Site Options 12 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) EVALUATION PROCESS The options developed for the Upper Failure Site (Table 4) and the Lower Reach (Table 5) were evaluated independently using the following criteria: • Constructibility — Criteria based on whether or not the option would allow smaller construction vehicle access without having to restore the failed portion of the access road between the Upper Failure Site and the Lower Reach. A value of 0 indicates that the access road would likely not have to be restored except for minor grading. A value of 5 indicates that the access road would need to be fully restored for access by large construction equipment. • Relative Construction Cost — Criteria based on relative construction cost. A value of 0 indicates that there is no construction cost. A value of 5 reflects a high relative construction cost. This evaluation criteria does not reflect inspection time by City maintenance staff. • Long-term Channel Stability — Criteria based on whether or not the option would provide long-term stability for the Upper Failure Site or short-term stability for the Lower Reach. A value of 0 reflects that stability is anticipated. A value of 5 reflects that failure is anticipated during a high -flow event. A lower value is preferred. • Maintenance Concerns — Criteria based on anticipated frequency of inspection. A value of 0 reflects an inspection frequency of less than one per year because stability is. anticipated. A value of 3 reflects quarterly to annual inspection frequency but that no maintenance is required because stability is anticipated. A value of 5 reflects that maintenance will need to be quarterly at a minimum and some amount of maintenance activity would be required because stability is not anticipated. • Off -Site Mitigation — Criteria based on if the option requires off -site mitigation. A value of 0 reflects no off -site mitigation required. A value of 5 reflects off -site mitigation will be required. Because of the small area disturbed during the emergency riprap placement in 2008 and 2009, it appears that mitigation can be provided on -site. Consequently, off -site mitigation is not likely to be required for any of the options. • These criteria were not evaluated for the Lower Reach since the Lower Reach is outside the limits of the emergency riprap placement. Table 4. Evaluation of Options for Upper Failure Site Option C - Option D - Full Option A - Option B - Stream Repair/Replace Restoration with Evaluation Criteria Do Nothing Construction Existing Storm Drain Open Channel Constructibility 0 5 5 5 Relative Construction Cost 1 3 4 5 Long-term Channel Stability 2 3 2 5 Maintenance Concerns 2 3 3 5 Off -Site Mitigation 0 0 0 0 Upper Failure Site Score: 5 14 14 20 City of Renton 218-1779-037 Upper Failure Site Options 13 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) Table S. Evaluation of Options for Lower Reach Evaluation Criteria Option A — Do Nothing Option B — Replace Existing Gabion Baskets Option C — Replace Existing Gabion Baskets with a Rockery Option D — Replace Existing Gabion Baskets with an Armored Sloped Requires full access restoration from Upper Failure Site to Lower Reach 0 0 0 5 Relative Construction Cost 0 2 1 5 Long -Term Channel Stability 5 3 3 3 Maintenance Concerns 4 2 2 2 Fish Passage N/A N/A N/A N/A Off -Site Stream Habitat N/A N/A N/A N/A Lower Reach Score: 9 7 6 15 PREFERRED ALTERNATIVE For the Upper Failure Site, Option A ranked the lowest and is the preferred alternative. Option A provides the lowest cost solution for the Upper Failure Site because there are no construction activities in the Upper Failure Site. The following options are not recommended for the Upper Failure Site: • Option B is not recommended because of concerns with the long-term stability of the streambed aggregate that would be placed in the new channel and does not increase protection of the existing sanitary sewer in this portion of the project area. • Option C is not recommended because the cost to repair or replace the existing storm drain does not increase protection of the existing sanitary sewer in this portion of the project area. • Option D is not recommended because of the cost and concerns with long-term stability of the stream restoration. For the Lower Reach, Options B and C are ranked similarly and have the lowest ranking. Options B and C provide the lower cost solutions to address short-term stability for the Lower Reach until the television inspection is performed in 2016. Option B (replace gabions) would use materials similar to existing conditions and could possibly reuse and recovered basket fill material. Option C (rockery) would require materials that are different from existing conditions. However, Option C has the advantage of not relying on the long-term stability of the gabion wire. If it is determined that the existing sanitary sewer can remain in its current location after the 2016 television inspection, the rockery installed in Option C could be left in place without long-term concerns regarding corrosion of the wire. This technical memorandum focused on impacts to previously constructed elements within the Upper Failure Site and Lower Reach, for example, potential options to address existing gabions. However, based on field observations by the geotechnical engineering firm, Soil and Environmental Engineering, there are locations along the west (left) bank of the Lower Reach where additional stabilization should be considered if Option B or C are implemented. The additional stabilization would include construction of approximately 95 linear feet of new rockery from 150 to 195 feet and 215 to 265 feet upstream of the existing WSDOT storm drain under I-405. Currently, there are no existing gabions at these locations but the west (left) bank is eroding. City of Renton 218-1779-037 Upper Failure Site Options 14 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) The following options are not recommended for the Lower Reach: • Option A is not recommended because of the potential risks to the existing sanitary sewer and the existing WSDOT storm drain if the gabions continue to fail or the right bank fails. • Option D is not recon-u-vended because the high cost could be a short-term solution if the existing sanitary sewer needs to be rerouted. Additional surveying, geotechnical field exploration, and engineering as well as television inspection of the existing sanitary sewer will be required to support future design phases of the preferred alternative. The cost of the preferred alternative is summarized in Table 6. The cost opinion includes the following assumptions: • There is no work in the Upper Failure Site; • Stream restoration will occur on -site; • The construction will occur outside of the rainy season; • Existing gabions will be replaced with new gabions based on the limits shown on as -built drawings; • Approximately 95 linear feet of rockery infill will be constructed; and • A long-term solution will be evaluated after the television inspection in 2016. Table 6. Summary of Cost Opinion for Preferred Alternative Item Opinion of Cost Approximately 400 square feet of on -site riparian restoration, including weed removal and understory plantings 2,000 Emergency Overflow Riser on WSDOT storm drain 14,650 Install approximately 56 cubic yards of gabion wall along Lower Reach access road 27,105 Install approximately 84 cubic yards of rockery infill along Lower Reach access road 15,575 Allowance for Temporary Erosion and Sediment Control 3,000 Subtotal, Construction: $62,330 Contingency 18,700 Sales Tax 5,920 Survey, Engineering, Geotechnical, TV Inspection 12,470 Permitting 3,120 Allowance for Temporary Construction Easements 3,120 Administration 3,120 Construction Management 6,230 TOTAL: $115,010 REFERENCES Parametrix, Inc. 2011. Thunder Hills Creek Permitting Options. Technical Memorandum to City of Renton. Puyallup, Washington. WDFW (Washington Department of Fish and Wildlife). 2003. Design of Road Culverts for Fish Passage. Fish Passage Technical Assistance. May 2003. City of Renton 218-1779-037 Upper Failure Site Options 15 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) WSDOT (Washington State Department of Transportation). 2008a. I-405, Tukwila to Renton Improvement Project (I-5 to SR 169 — Phase 2) Ecosystems Discipline Report. Prepared by Anchor Environmental, LLC. WSDOT. 2008b. Thunder Hills Creek Culvert Emergency Replacement, I-405, MP 3.05, Summary Report. City of Renton 218-1779-037 Upper Failure Site Options 16 June 21, 2011 ATTACHMENT A - SCORING CRITERIA CITY OF RENTON Thunder Hills Creek 1 I I Ranking of Project Options I I � I I I Option C - Repair Option B - / Replace Option D - Full Option A - Off- Stream Existing Storm .Restoration with Evaluation Criteria site Mitigation Construction Drain Open Channel Comments UPPER FAILURE SITE Requires full access restoration from Upper Failure Site to Lower Reach 0 5 5 5 0 = does 1 require; 5 = required _ _ 10 = none; 3 = medium range of options 'considered; 5 = high. Does not reflect cost for maintenance staff for inspection Relative Construction Cost 1 3 4 5 for maintenance actions I 10 = long term stability anticipated. 2 or 3 concern of loss of looser material under existing riprap. 5 = subject to Long Term Channel Stability 2 3 2 5 !failure during high flow event. IO = none or low if option is considered !stable for the long term. 3 = quarterly to 'annual inspection frequency to review stability but option is considered relatively stable for the long term. 5 = Maintenance Concerns 2 3 3 5 !subject to failure in high flow event _ ;Not evaluated since stream was not Fish Passage N/A N/A N/A N/A ,likely fish passable. _ _ I 10 = not required since option provides on Off -site Stream Habitat 0 0 0 0 site stream restoration. 5 = required. Upper Failure Site Score 5 14 14 20 LOWER REACH i Option D - Option C - Replace Existing Option B - Repair Replace Existing Gabion Baskets Option A - Do ExistingGabion Gabion Baskets with an Armored Evaluation Criteria Nothing I Baskets with a Rockery Sloped (Comments Requires full access restoration i from Upper Failure Site to I Lower Reach 0 0 0 5 10 = does not require; 5 = required 0 = none or low; 3 = medium range of options considered; 5 = high. Does not ;reflect cost for maintenance staff for Relative Construction Cost 0 1 2 1 5 inspection or maintenance actions 0 = long term stability anticipated. 2 or 3 = concern of loss of looser material under existing nprap. 5 = subject to Long Term Channel Stability 5 3 3 3 !failure during high flow event. 0 = none or low if option is considered stable for the long term. 3 = quarterly to annual inspection frequency to review stability but option is considered 'relatively stable for the long term. 5 = Maintenance Concerns 4 2 2 Isubject to failure in high flow event _ __2_ 'Not evaluated since stream was not Fish Passage N/A I N/A N/A N/A Iiikely fish passable. Not evaluated since Lower each is !outside the emergency riprap placement Off -site Stream Habitat N/A WA N/A N/A !area. Lower Reach Score 9 7 6 15 218-1779-037 (01/04) Prepared February 2011 Data and Analyses.xlsx \ 201 10208 Ranking Page 1 of 1 ATTACHMENT B - CONCEPTUAL GABION OR ROCKERY SECTION SKETCHES 1 NOTES: 1. INSTALL NEW GABION BASKET ON TOP OF EXISTING GABION IF EXISTING GABION WIRE IS STILL IN TACT. WHERE EXISTING GABION WIRE HAS FAILED IN LOWER COURSE, REMOVE EXISTING GABION AND INSTALL TWO LAYERS OF GABIONS. 2. DO NOT REMOVE MORE THAN 10- TO 15-FT OF EXISTING GABION MATERIAL AT A TIME. 3. SECTION BASED ON INFORMATION NEAR GPR 3. GABION FAILURE, EROSION OF ACCESS ROAD, LOCATION OF EXISTING SANITARY SEWER. AND LOCATION OF STREAM VARIES. EXISTING ACCESS ROAD \ BACKFILL WITH 2" MINUS CRUSHED ROCK WITHOUT FINES i EXISTING SS J LEAVE EXISTING GABION IN PLACE EXCEPT WHERE EXISTING WIRE HAS FAILED CONCEPTUAL SECTION NOT FOR CONSTRUCTION NTS STREAM BOTTOM / i / EXISTING GROUND �T ON SANDSTONE LAYER Parametrlx GATE: AP114, 2011 FILE: SU37S4813F-04 Thunder Hills Creek Lower Reach Option B Replace Existing Gabion Baskets NOTES: 1. WHERE UPPER COURSE OF EXISTING GABION HAS FAILED, REMOVE ANY REMAINING PORTIONS OF BOTH THE UPPER AND LOWER COURSE AND INSTALL TWO LAYERS OF 3- OR 4-MAN ROCK. 2. DO NOT REMOVE MORE THAN 10- TO 15-FT OF EXISTING GABION MATERIAL AT A TIME. 3. SECTION BASED ON INFORMATION NEAR GPR 3. GABION FAILURE, EROSION OF ACCESS ROAD, LOCATION OF EXISTING SANITARY SEWER, AND LOCATION OF STREAM VARIES. I \ EXISTING ACCESS RC \ BACKFILL WITH 2" MINUS CRUSHED ROCK WITHOUT FINES �l EXISTING SS CONCEPTUAL SECTION NOT FOR CONSTRUCTION NTS Parametrlx GATE: April 14. 2011 FILE: SU3784813F-04 No STREAM BOTTOM J 6 % i � EXISTING GROUND iET ROCK ON SANDSTONE LAYER Thunder Hills Creek Lower Reach Option C Replace Existing Gabion Baskets with a Rockery ATTACHMENT C - CONCEPTUAL OPINION OF PROBABLE CONSTRUCTION COST of Unit Unit Cost I Amount Includes 12 cubic yards for Furnish and install 1 ea 84-inch ID CB Type 2 with Structure Excavation Class B 1 EA house -style opening and beehive grate. $14,650.00 $14,650 Including Haul. Based on 168-If of existing gabions per survey and 3-ft by 3-ft existing gabion section per record drawings. Assumes only 1 layer is removed. Unit cost based on Structure Excavation Class B 56 CY Remove top course of existing gabions $100.00 $5,600 Including Haul. Furnish and install new gabion baskets and 168 LF crushed rock $128.00 $21,504 Assumes 1 course of gabions Assumes 1 layer of 4-man rock 48 TONS 4-man Rdck *ton ockery infill `J $125.00 $6 000 ' for 95 If Structure Excavalon Class B Including Haul for,' 1 Assumes 95 If at 6-ft wide by 4-ft 84 CY rockery infill' 4: $100.00 :$8 400 : high for new rockery t w Assumes 2-fl wide by 4-ft high r :: aggregate section behind large 47 TONS Backidl for'Rock Wall alorid rockev ihfill 9 $25.00 $1 175 -; rock. Furnish and install 1 ea 84-inch ID CB Type 2 with 1 EA jailhouse-style opening and beehive grate. $14,650.0 48 TONS 4-man Rock for rockery infill $125.00 _ Structure Excavation Class B Including Haul for 84 CY ,rockery infill $100.00 47 TONS Lackfill for Rock Wall along rockery infill $25.00 I 112 1 CY Remove two course of existing gabions I I 168 TONS i4-man Rock for replacing existing failed gabioi Structure Excavation Class B Including Haul fc 74 CY rockery to replace existing failed gabions IBackfill for Rock Wall along rockery to replace 168 TONS existing failed gabions Furnish and install 1 ea 84-inch ID CB Type 2 1 EA jailhouse-style opening and beehive grate. 48 TONS 4-man Rock for rockery infill _ Structure Excavation Class B Including Haul f 84 CY rockery infill I 47 TONS Lackfill for Rock Wall alono rockery infill 1 1 LS $125.00 $100.00 I Includes 12 cubic yards for Structure Excavation Class 8 $14,650 Including Haul_ (Assumes 1 layer of 4-man rock $6.000 for 95 If Assumes 95 If at 6-ft wide by 4-ft $8,400 � high for new rockery Assumes 2-ft wide by 4-ft high aggregate section behind large $1,175 rock. ,Based on 168-If of existing ;gabions per survey and 3-ft by 3-ft existing gabion section per record jdrawings. Assumes 2 layers are removed. Unit cost based on Structure Excavation Class B $11,200 :Including Haul. ,Weight from WSDOT Standard Specifications. Assumes 2 layers $21,000 of 4-man rock. Assumes 168 If at 2-ft wide by 6-ft $7,400 I high 'aggregate section behind large 11 $25.00 $4 200 rock ;Assumes 5 days of labor. Includes 12 cubic yards for Structure Excavation Class B $14,650.00 $14,650 iIncluding Haul. Assumes 1 layer of 4-man rock $125.00 $6,000 (for 95 If (Assumes 95 If at 6-ft wide by 4-ft $100.00 $8,400 high for new rockery (Assumes 2-ft wide by 4-ft high aggregate section behind large $25.00 $1,175 (rock. I Not estimated; not considered cost effective for a short term solution. Does not provide lateral support and not considered cost Not Estimated Not Estimated effective for a long term solution. r. ' x'. lA ' Notes: I I Does not reflect $2,000 for riparian vegetation restoration for Uppear Failure Site. 218-1779-037(01/05) Cost Opinions.xls \ 04_05_2011 Prepared February 2011 Page 1 of 1 CITY OF RENTON Thunder Hills Creek Concept -level Opinion of Probable Cost for Lower Reach For Preferred Option Description Location Amount, $ Approximately 400 square feet of off -site stream restoration, including grading and plantings Upper Failure Site 2,000 Emergency Overflow Riser on WSDOT culvert Lower Reach Install<approximately 56 cubic yards of new dabions to, replace existing failed gabions along Lower�Reach Lower Reach Con-tructy,approximatelyr84 cubic yards of�rockery Lower Reach Allowance for Temporary Erosion and Sediment Upper Failure Site and Lower Control Reach 14,650 27,105 3,000 Sub -total,. Construction 62,330 Contingency -- -- — --- ------------ 30% -- 9.50% 18,700 - -- Sales Tax 5,920 Survey, Engienering, Geotechnical 20% 12,470 Permitting 5% 3,120 Allowance for temporary construction easements 5% 3,120 Administration 5% 3,120 Construction management, 10% 6,230 Total 1 115,010 218-1779-037 (01/05) Cost Opinions.xls \ Preferred Option Prepared February 1 of Page 1 of 1 ENGINEERING . PLANNING . ENVIRONMENTAL SCIENCES 1019 39th AVE SE, SUITE 100 PUYALLUP, WA 98374 T.253.604.6600 F.253.604.6799 www.parametrix.com TECHNICAL MEMORANDUM Date: June 21, 2011 To: Dave Christensen John Hobson Ron Straka Allen Quynn From: Jenna Friebel ffiyylf� Subject: Permitting Opti ns cc: Project Number: 218-1779-037 Project Name: Thunder Hills Creek INTRODUCTION The purpose of this technical memorandum is to summarize the proposed habitat mitigation for both the Upper Failure Site and the Lower Reach, document the anticipated permits required for the project, summarize impacts, and outline a mitigation strategy for impacts to riparian habitat. This memorandum was prepared specifically to address stream and habitat restoration and permitting. See the memorandum dated April 15, 2011, prepared by Parametrix for further project details, project options, and evaluation of identified options. PROJECT DESCRIPTION The project area is located in the steep confined ravine of Thunder Hills Creek just southeasterly of I-405 in Renton (Figure 1). The project area, which includes 660 linear feet of Thunder Hills Creek (280 feet are located in a pipe), is divided into two distinct reaches: the Upper Failure Site and the Lower Reach, which are generally divided by the headwall and steep piped segment of stream. The original project purposes included determining the location of the existing sanitary sewer relative to the stream channel, evaluating the condition of the existing sanitary sewer, and identifying mitigation options to offset environmental impacts associated with the emergency placement riprap that occurred in 2008 and 2009. However, because the existing sanitary sewer was not able to be television inspected due to limitations in the ability of the system to accommodate inspection equipment (the City has scheduled television inspection in 2016), the project purpose has been refined. The current project purpose focuses on evaluating short-term options to keep the sanitary sewer stable from potential stream migration in the lower reach until the television inspection is performed and on developing stream mitigation plans to offset impacts associated with both the emergency riprap placement in the Upper Failure Site and the preferred option for protecting the sanitary sewer in the Lower Reach. � => bra •fit � ' . � ,y` ` � • ,<' � `- Q3 �. /; �+! „Ss; ft" r � t EEby •.� � • g� i�t . �+� c+.r�� f� f�"'� �. ,THUNDER HMLS CREEK ... , � PROXIMATE LOCATION, P15--v • @s I �.9�, .ram , j "¢�•+�t '<" y' r f T LOCAWIN ' '� ..,,! t 1 •� .^♦r tr r w,; -4-'cra `'n � � rsi..� it i'�4 its' Ak lot rxf+` t '.' �`•' OWN 10, Magi oo t 3�•, t �,m i . �•i' ` y a . F , s->• � � �. lkr. r +-s. r n a wf v { 4 i ` low, t om aa•.y t'Y�'•r �}�, ss �'`� S}r � yt...; 1 'tt"•t lb' ;�' ,{�,ws�'& ' irk' µy�,,� £S y��.,g• ',i FE R w �, a �y,,1lo ✓r :a f AR fat 9po-' .•4 1l ��. �; - ti ,' � r 4�� y:n- %F" t. -kfRt�,� '�' �L.r� y4 g'. y, i. df,{l .14 •% i x,.1 !„Y pig 5 '`3 v S t �q -�s'3"' D ���. \���''1 �TTI {F.` ��• �'� SJ1t1• ..T IX Ell J. im ti . "a� ♦y ;8 � �9 TECHNICAL MEMORANDUM (CONTINUED) Upper Failure Site Site Conditions The Upper Failure Site begins approximately 380 feet upstream of the I-405 storm drain and continues approximately 280 feet upstream. During the 1960s, an access road was constructed during sewer line installation. At that time, approximately 280 linear feet of Thunder Hills Creek was placed in a storm drain. In November 2008, this storm drain failed during a large storm event. The failure caused the storm drain to plug which resulted in the stream flowing overland above the storm drain. This overland flow resulted in erosion above the stone drain and along the sanitary sewer access road. In response to the failure, a section of the storm drain and the eroded area was regraded and covered with straw. In November 2009, material plugged the storm drain inlet which once again led to extensive erosion of the access road and the area above the storm drain. City of Renton maintenance crews unplugged the stone drain and constructed a trapezoidal overflow channel above the storm drain. This overflow channel was constructed in November/December of 2009 using large rock and quarry spalls that were placed in the eroded areas to minimize the potential of further erosion and protect the integrity of the access road, the existing sanitary sewer line, and the repaired storm drain. Placement of riprap occurred within previously disturbed areas, the stream channel below the ordinary high water mark (OHWM) at the upstream entrance to the existing storm drain, and immediately adjacent to the channel in riparian habitat. The riparian habitat affected was low quality, consisting of herbaceous species and shrubs, and was dominated by invasive species, primarily Himalayan blackberry (Rubes armeniacus). Thunder Hills Creek continues to be subject to erosion, although the emergency repairs achieved the desired goals. Preferred Alternative for Upper Failure Site The preferred alternative for the Upper Failure Site is to continue to monitor the site for stability and repair the riprap as needed to ensure long-term stability at the site. This alternative will not require placement of riprap outside the area impacted during the 2008 and 2009 emergency response. Any stream or riparian areas disturbed by equipment during on -going repair work will be restored to the existing condition. See the April 15, 2011, technical memorandum regarding the options considered for the Upper Failure Site. Lower Reach Site Conditions The Lower Reach is downstream of the upper reach where the stream is located in a ravine with steep sidewalls. The stream channel is incised and largely contained in weathered sandstone with very little in -stream habitat or gravel. The right bank is made of sandstone and is relatively stable. The existing sanitary sewer and access road is located along the left bank. Portions of the left bank have been armored with gabion baskets, which were intended to protect the unstable loose materials associated with the historic access road. Many of the existing gabion baskets are currently failing. In many cases, the stream material supporting the gabions or located in the bank behind the gabions is eroding and/or material within the gabion baskets has been washed out. Preferred Alternative for Lower Reach The preferred alternative for the Lower Reach is to stabilize the maintenance access road until the television inspection is performed in 2016. This would include replacing the existing failing gabions with new gabions or rockery. Existing gabions would be replaced starting with the most severe failure locations. Gabion replacement would be performed in short increments, approximately 10- to 20-feet at a time, to reduce the potential for loss of lateral stability along the access road. The preferred alternative for the Lower Reach also includes installing an emergency overflow riser on the inlet to the WSDOT storm drain under I-405. Except for installing a new emergency overflow riser, the proposed actions associated with the Lower Reach are classified as maintenance and repair, but would still require environmental permits as discussed in the following section. City of Renton 218-1779-037 Permitting Options 3 June 21, 2011 TECHNICAL MEMORANDUM (CONTINUED) PERMITTING REQUIREMENTS The proposed work in the lower reach will require several environmental permits which are summarized in Table 1. Table 1. Environmental Permitting Requirements Environmental Permit (Environmental Documentation Needed) Lower Reach Average Agency Review Time Notes Renton: Clearing and Grading (Critical Areas Report) X 1-3 Months Ecology: Construction NPDES NA Construction will disturb less than 1 acre of land WDFW: HPA (JARPA) X 1-2 Months Will require some work within OHWM USACOE: 404 Permit (JARPA) X 1-6 Months Nationwide 3 Permit Biological Assessment X 1 Month No Effect Letter assumed SEPA Checklist X 1-3 Months The preferred alternative for the Upper Failure Site would not require any construction activities. Therefore, the City would not be required to obtain any pen -nits for continued monitoring of the site. If additional riprap is required to stabilize the channel, then applicable environmental permits, similar to those listed in Table 1, would likely be required. MITIGATION During emergency response efforts in 2008 and 2009, riprap was used to stabilize portions of the Upper Failure site. Riprap was placed in a portion of the open stream channel and riparian areas adjacent to the upstream end of the existing storm drain to prevent further erosion, channel instability, and property damage. In general, most of the riprap was placed in areas impacted by previous projects (Figure 2). However, it is likely that WDFW will require some mitigation for the placement of the riprap below the OHWM in areas not previously filled with riprap. Replacement of the existing failing gabions in the Lower Reach would be performed as a maintenance action to protect the sanitary sewer until it is television inspected in 2016. Replacement of the existing gabions will not require mitigation because replacement of the riprap is maintenance- and self -mitigating. WDFW Policy WDFW Policy POL-M5002 summarizes the WDFW requirements and recommendations for mitigation for impacts to streams. The goal of this policy is to achieve no loss of habitat functions and values and to maintain the functions and values of fish and wildlife habitat. According to WDFW, mitigation ratios shall be greater than 1:1 to compensate for temporal losses, uncertainty of performance, and differences in functions and values. Mitigation should ensure no loss of habitat functions or values, or fish and wildlife populations. Although WDFW prefers on -site and in -kind mitigation, off -site and out -of -kind mitigation is also acceptable. According to this policy, WDFW generally requires that mitigation ratios provide equal or better biological functions and values as compared to the existing conditions. The factors WDFW must consider in making this decision are identified in RCW 90.74.020 (3). City of Renton 218-1779-037 Permitting Options 4 June 21, 2011 PROJECT AREA OF "IPAC7 EXCESS MATERIAL PLACED AFTER 2009 OVERFLOW CHANNEL CONSTRUCTION \ pt EXISTING THUNDER HILLS CREEK CULVERT 364 DIA INSIDE 48'i DUV PIPE t EXISTING SANIT V EWER EXISTING RIPRAP L M TS F i \\ 75-FT FROM CULVERT (j ASSUME CULVERT IN .t HISTORIC STREAM CHANNEL EXISTING STORM DRAIN CATCH BASIN EXISTING THUNDER HILLS CREEK CULVERT, 48' DIA \ \ .� . �\ .,•. ti \ j. RIPRAP AT CULVERT ENTRANCE EXISTING GRAVEL ACCESS ROAD !"i / THUNDER HILLS CREEK C \,. £\"'m \ ` l� ', of ,`•i `� IMPACTED AREA=401 SO FT, AREA IMPACTED DURING 2008 AND 2009 EMERGENCY ACTIONS THAT WAS NOT PREVIOUSLY DISTURBED. LEGEND — — _ PARCEL LINE UTILITY EASEMENT LINE EXISTING RIPRAP LIMITS iMetrl][ o..r. w...n n,i me. sunsieisa, 75-FT FROM CE y -�?'. STREAM "'y`^5.�,.✓1 \\ �+ \ , POTENTIAL SITE k` EXISTID WALLS Figure 2 Thunder Hills Creek N Area of Impact TECHNICAL MEMORANDUM (CONTINUED) Functional Assessment Based on review of design drawings of the original 1960s project, projects constructed in the early 1980s, and an evaluation of the site, there was very limited in -stream or riparian habitat in the project area even before the emergency responses in 2008 and 2009. Prior to 2008, the stream channel was already located in a storm drain and the riparian area was primarily a gravel road, grass, and low -growing shrubs or weeds. Therefore, at the time of the emergency actions, the existing functions normally provided by streams and riparian areas were already degraded. Specifically, the riparian buffer did not provide adequate levels of LWD recruitment, overhead stream cover, bank stability, leaf litter recruitment, and water quality maintenance. In addition, Thunder Hills Creek does not support anadromous fish use. The stream supports cutthroat trout, western brook lamprey, sculpin, and threespine stickleback, but likely in the reaches upstream of the Upper Failure Site (WSDOT 2008). Springbrook Creek, which is located approximately 1.5 miles downstream, is the closest stream that supports Chinook, coho, and steelhead trout. Based on the WSDOT Environmental Assessment of this watershed, 1-405 acts as a complete upstream fish passage barrier due to the water velocity in the stonn drain during high water flows and the report mentions numerous additional blockages to fish migration throughout Thunder Hills Creek (WSDOT 2008). In addition, hydrologic and sediment conditions in the project reach is not conducive to salmonid spawning or rearing. The stream gradient within portions of the project reach exceeds 20 percent, which is on the extreme high end of gradient range which can support upstream salmonid migration. In addition, in the absence of properly installed bank protection, the erosion of fine sediment would likely result. The mobilized sediment would then be transported downstream, and potentially deposited in downstream reaches that may support salmonid spawning. Direct Impact Calculation Impacts to the stream and riparian area from the 2008 and 2009 emergency response and the proposed project were calculated using the methodology described in the following section. • Areas impacted in the 1960s and early 1980s were delineated on the base map (see Figure 2). • Areas where riprap was placed during the 2008 and 2009 emergency responses were delineated on the base map. • Areas not impacted by previous projects where "new" riprap was placed during the 2008 and 2009 emergency responses were identified. This area (approximately 400 square feet) is assumed to be directly impacted by riprap, which has potentially caused some minor loss of riparian functions and in -stream habitat. Proposed Mitigation Strategy WDFW bases mitigation on loss of function and determination of appropriate mitigation for lost function is somewhat subject and varies from project to project. Because such a small area of riparian area was impacted by riprap placement (approximately 400 square feet) and no in -stream habitat was impacted by the project and because the site provided limited function prior to 2008, a mitigation ratio for riparian impacts of 1:1 is proposed to offset the direct impacts of the riprap placement. Although the impacts occur in the Thunder Hills Creek basin, which does not provide habitat for anadromous fish, on -site mitigation is preferable if feasible. Enhancement of approximately 400 square feet of degraded buffer (blackberry and herbaceous species) of Thunder Hills Creek with native trees and shrubs will enhance riparian buffer functions, at an equal or greater level than the areas affected by placement of riprap (see Figure 2). Any invasive vegetation present within the mitigation area would be removed prior to planting. REFERENCES WSDOT (Washington State Department of Transportation). 2008. I-405, Tukwila to Renton hnprovement Project (1-5 to SR 169 — Phase 2) Ecosystems Discipline Report. City of Renton 218-1779-037 Permitting Options 6 June 2/. 2011 I_.DEl""WOOD Proposal S12-2010 Queensborough Sewer Rehabilitation Project Index Page Index..........................................................................................................................................1 Letter of Interest Letterof Interest.............................................................................................................2-3 Proposal A. Specialized Experience and Technical Competence.........................................4-9 Project Team — Organization Chart ................................................................................... 5 ProjectTeam — Narrative...............................................................................................6-9 B. Work Plan/Level of Effort (LOE)............................................ Not Included in 20 Page Limit Work Plan — Narrative........................................................................................... WP 1-15 Levelof Effort .........................................................................................................LOE 1-2 C. Record of Past Performance & Project Examples ......................................... 10-16 Record of Past Performance — Narrative..................................................................10-12 ProjectExamples......................................................................................................12-16 Resumes Project Team Resumes................................................................ Not Included in 20 Page Limit M 11 [�7 INDEX Page 1 C* 1.111111 Included in 20 pages CCONSULT,I TS Letter of Interest j. _ v CON S_ 0 LTA N T S Engineers Planners September 10, 2010 Bob Hastings, Construction Project Manager Alderwood Water & Wastewater District 3626 156th Street SW Lynnwood, WA 98087-5021 BHC Consultants, LLC 1601 Fifth Avenue, Suite 500 Seattle, WA 98101 206.505.3400 206.505.3406 (fax) www.bhcconsultants.com Subject: Proposal for Professional Services — S12-2010 Queensborough Sewer Rehabilitation Project Dear Mr. Hastings: BHC Consultants, LLC (BHC) is excited to provide you with this proposal for the Queensborough Sewer Rehabilitation Project. This project requires the involvement of a number of different and specialized disciplines and expertise. It also requires the involvement of experienced senior level individuals to not only perform the work, but work closely with you and others at the AWWD. We have assembled a talented team, some of whom you and other staff are probably already familiar with, to provide the necessary expertise. Our team includes BHC for project management, rehabilitation of the sewer, maintenance access, community outreach, easement acquisition and oversight of the stream's restoration and mitigation; Herrera Environmental Consultants for environmental and permitting; Shannon & Wilson for geotechnical; Hammond Collier Wade Livingstone for surveying and mapping; Macaulay & Associates for property appraisals; Interactive Pipe Inspection for inspection of the pipe and manholes and; Cascadia Archaeology for archaeological survey. Each member of the team brings specialized expertise to the table which will allow us to make certain the needs of the project are met. We have worked with all of the firms on past projects and have developed good working relationships with one another. There are many reasons the BHC team is worthy of the AWWD's selection. We believe the BHC team offers the District the following: ® A solid understanding of project issues and requirements ® Demonstrated successful and relevant experience ® A talented and dedicated team that has worked together on sewer related projects A Solid Understanding of Project Issues and Requirements — The BHC team understands the project issues and requirements. We can claim this as over the past month our team has met with the AWWD, reviewed available information, and performed field reconnaissance along the interceptor sewer's alignment. In addition, our key team members have all worked on similar projects, and consequently, have a good understanding of the typical and likely issues and requirements that will be involved with this project. LETTER OF INTEREST Page 2 Included in 20 pages : {JNSULTAr=4TS Alderwood Water & Wastewater District S12-2010 Queensborough Sewer Rehabilitation September 10, 2010 Demonstrated Successful and Relevant Experience — We have successfully completed a number of sewer rehabilitation and cross country sewer projects. We are experienced with 1/1 studies, trenchless technologies, environmental and permitting requirements as well as easement acquisition and effective community outreach. Over the last ten years, BHC professionals have successfully completed more than 200 sewer system projects. Our capable and experienced staff have planned, studied, designed, permitted and constructed numerous sewer system improvements for municipalities, counties, and districts throughout western Washington. In the last decade, Reed Kelly, our proposed project manager, has completed over 30 sewer system improvement projects for municipalities in Washington. A Talented and Dedicated Team that has Worked Together on Sewer Related Projects — The BHC team is comprised of some of the most experienced, capable and respected firms and individuals in the Puget Sound region. This team of talented and dedicated individuals will give priority, and be responsive, to you and the project. Reed Kelly is the proposed project manager and has project management experience on wastewater projects ranging from feasibility studies to preliminary engineering, final design and construction management over the past 27 years. Reed is an experienced, hands-on, communicative project manager who enjoys managing, being involved in the design work, and working side by side with the client and team members. Reed has worked with Shannon & Wilson on several projects over the years (Juanita Bay Pump Station, Lake Forest Park Sewer System Expansion, Kitsap County South Central Force mains). BHC has also worked with Herrera Environmental on a number of projects (Vashon Landfill, Southwest Regional Transfer Station, Cedar Hills Landfill). Reed as well as others at BHC have also worked a great deal with Macaulay and Associates (City of Marysville Trunk Sewer, Edgewood Sewer, Carlsborg Sewer, Bainbridge Island Sewer). Lastly, Reed has been working recently with Hammond Collier Wade Livingstone on a recent sewer project for the City of Fircrest. The BHC team is sincerely interested in working with AWWD on this project. We look forward to being given the opportunity to present ourselves and further demonstrate that the BHC team is the best suited to assist the AWWD implement this project. Should you have any questions or require additional information, please feel free to contact me at 206-505-3400. Respectfully Submitted, Reed Kelly,'}PE Project Manger LETTER OF INTEREST Page 3 0 Included in 20 pages CO'N' 1ATAN-t Proposal A. Specialized Experience & Technical Competence ►,_r i R'yV00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project A. Specialized Experience and Technical Competence BHC Consultants, LLC (BHC), is ® ■ an employee owned and managed C QN' ,cLTAN i 1 consulting engineering and planning firm located in Seattle, Washington comprised of 45 engineers, planners, and support personnel. Our civil and structural engineering staff is one of the most experienced in municipal utility design and construction in the Northwest. We are very adept at providing efficient design and study services on small as well as large complex projects. Most of our civil engineering staff have worked together in the northwest for 30 years and have collectively solved some of the more intriguing design and construction challenges found in the region. Our main focus and bread and butter for the last 20 years has been wastewater projects, including the planning, design, rehabilitation, and construction services for all elements of the wastewater industry. Our attention has been on, and the main focus of our expertise centers on collection, conveyance, treatment, and disposal. The following table concisely illustrates our areas of expertise. B ME ■ Gravity ■ Submersible ■ MBR ■ Saltwater ■ Comprehensive Pump Outfalls Sewer Plans Stations ■ STEP/Grinder ■ Wet Well/Dry ■ Activated ■ River ■ Inflow & Well Pump Sludge Outfalls Infiltration Stations ■ Vacuum ■ Self Priming ■ Oxidation ■ Spray ■ LID & ULID Pump Ditch Irrigation Formation Stations ■ Vacuum ■ SBR ■ Subsurface/ ■ Rate Analysis Stations Infiltration ■ Interceptors ■ Recirculating ■ District Sand Filters Management Assistance ■ Siphons n SPECIALIZED EXPERIENCE & Page 4 0 TECHNICAL COMPETENCE C0i':SUICT NITu Included in 20 pages LD17, R\V00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Project Team — Organization Chart The commitment, availability, and expertise of your project team will determine the successful outcome of this project. BHC has assembled a project team that will provide creative and practical solutions to the District. Team Key 1- BHC Consultants 2- Herrera 3- Shannon & Wilson 4- Hammond Collier Wade Livingstone 5- Macaulay & Associates 6- Interactive Pipe Inspection 7- Cascadia Archaeology Larry Amans, PE 1 Project Engineer Julie Hampden z Environmental Scientist Kris Lepine, PWS 2 Ecologist Greg Wadell Chris Brummer, PhD, PE, LEG s Planner Geomorphologist Dave Harms, PE 1 Hydrologic Analysis Ian Mostrenko, PE 2 Hydraulic Analysis & Stream Restoration Les Hillebrand, PLS 4 Survey Manager Dennis Smith 6 Inspection Lead Bill Laprade, LEG 3 Geologist Larry West, LHG 3 Hydrogeologist Brian Reznick, PE 3 Geotechnical Lead Stan Boyle, PhD, PE 3 QC & Design Review John Hatch 1 Design/Construction Review & Schedule Gary Bourne, PE' Easements/Outreach Bob Macaulay 5 Lead Appraiser Archaeology? Archaeologist SPECIALIZED EXPERIENCE & Page 5 ©� � TECHNICAL COMPETENCE 0IN'SULTA NT5 Included in 20 pages t_Dr_RNV`O«D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Project Team — Narrative The following narrative briefly highlights our team members' relevant experience and technical competence in their disciplinary specialties. Detailed resumes for each of the key team mernbers identified are provided under the "'Resume" tab in this proposal. CONIS rLTANTS Reed Kelly, PE is our proposed Project Manager and will have overall responsibility for the scope of work, budget and schedule compliance, coordination with the District and subconsultants, and the overall technical aspect and quality of the work. Reed is a senior project manager and principal engineer with over 27 years of diverse experience in planning, permitting, designing, and constructing water, wastewater (municipal and industrial), stormwater, solid waste, and general civil facilities. He has specialized experience with wastewater conveyance systems that includes comprehensive sewer system planning, infiltration/inflow studies, trenchless technologies, rehabilitation, as well as the design and construction of collection facilities, pumping systems and often related odor control facilities. He has been involved with wastewater facility planning for dozens of communities both in Washington and California, and has been responsible for, and prepared numerous engineering reports, preliminary engineering feasibility studies, and plans and specifications for collection system improvements (6- to 36-inch sewers), small to large pumping systems (50 gpm to 4,000 gpm) and odor control facilities and forcemains (<4-inch to 36-inch). Craig Chambers, PE is our proposed Project Principal. Craig will assure that Reed has the resources and staff needed to successfully complete the project, and will be available to provide technical guidance as appropriate and review the work for quality assurance/quality control. Craig has over 30 years of experience in the planning, design, and construction of wastewater systems and was the project manager for the most recent Update to the District's Comprehensive Sewer Plan. Larry Amans, PE will be the Project Engineer for pipe and manhole investigations and rehabilitation. Larry has over 35 years of experience designing and providing construction support services for hundreds of thousands of feet of sewer and water pipelines. Gary Bourne, PE will lead the charge for Easement Acquisition and Community Outreach. Gary has over 35 years experience in providing engineering and community outreach services for municipal infrastructure projects throughout the Puget Sound region. Dave Harms, PE will provide Hydrologic Analysis. Dave has over 25 years of experience with comprehensive sewer planning and design studies Dave is well versed in using state of the art hydraulic and hydrologic computer models for analyzing these types of systems. John Hatch will assist in the development of the preliminary Construction Cost and Construction Schedule and review and critique the design. John has over 40 years of experience in design, construction management, and inspection of numerous wastewater and water facilities for both public and private clients. SPECIALIZED EXPERIENCE & Page 6 TECHNICAL COMPETENCE C "t7NG0i-T,,D]TS Included in 20 pages I. DER:\V'(_) 0 D Proposal S12-2010 Queensborough Sewer Rehabilitation Project To supplement our in-house team and address all the elements of the project, we have included the following subconsultants to our team. HERRER4 Herrera Environmental E:h:+AioO:.h:Et.TAC CGht;ULTF.UiS Consultants (Herrera) staff will provide Stream Geomorphology & Restoration and Environmental Assessments and Permitting. Herrera is a Seattle -based consulting firm, established in 1980, providing scientific and engineering services to public and private clients throughout the Pacific Northwest. With over 110 highly qualified engineers, environmental scientists, biologists, and planners, Herrera has the staff and experience for providing comprehensive services and solutions on natural resource projects. Herrera's expertise encompasses all phases of environmental planning and analysis, conceptual through PS&E, and construction and post -construction monitoring. Chris Brummer, PhD, PE, LEG and Ian Mostrenko, PE will provide Stream Geomorphology & Stream Restoration services to the team. Chris is a professional engineer and licensed engineering geologist with 19 years of both applied and research experience in the fields of geology and engineering geology. Ian is a senior civil engineer with 17 years experience in civil and environmental engineering projects including stream restoration, surface and ground water quality, stormwater design, and general civil site development design. Julie Hampden and Kris Lepine will be responsible for Environmental Permitting. Julie is a senior environmental scientist and policy analyst with 14 years of experience in fisheries, wildlife, natural resource management, education, and policy analysis. Kris has 12 years of professional experience in wetland assessment, wildlife biology, fisheries biology, restoration and mitigation, wetland mitigation banking, environmental permitting, and environmental chemistry. Q1 SHANNON6WILSON,INC. Shannon & Wilson staff will provide will provide Geologic, °°.a,,. Hydrogeologic, and Geotechnical services. Since 1954, Shannon & Wilson geotechnical engineers have completed field exploration and geotechnical engineering studies for pump stations, wastewater treatment plants, and related conveyance systems for sewer, water, and public utility districts throughout the Puget Sound. Their ability to provide a full range of in-house expertise from geologic reconnaissance and characterization, slope stability, seismicity, environmental services and geotechnical foundation design provides reliable support in the siting design and construction of wastewater and water related systems and facilities. Bill Laprade, LEG will be the team's Engineering Geologist. Bill has more than 37 years of experience in all phases of geotechnical consulting. His specialties include interpretation of glacial stratigraphy for design of civil works projects, slope stability evaluations in a multitude of geologic conditions, and the geotechnical aspects of hydroelectric facilities, including small and large diameter pipelines. SPECIALIZED EXPERIENCE & Page 7 TECHNICAL COMPETENCE GU NSULT; ,NTS Included in 20 pages 1::IZ`V00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Larry West, LHG will be the team's Hydrogeologist. Larry has 37 years of experience in ground water management, development, control, and protection. He has conducted over 150 construction dewatering evaluations and dewatering system designs across the United States and overseas. Brian Reznick, PE will provide Geotechnical Engineering support. Brian has 8 years of professional experience in geotechnical engineering developing subsurface exploration and laboratory testing programs, managing field and laboratory work, completing design analyses, preparing reports, managing staff for the analyses and report preparation, and reviewing plans and specifications. Stan Boyle, PhD, PE will provide QC & Design Review and Support of the geotechnical work. Stan has 25 years experience in construction and design including evaluating and designing trenched and tunneled pipeline installations, retaining structures, highway and railroad embankments, excavation shoring systems, and structure and bridge foundations. Hammond Collier Wade Livingstone (HCWL) staff will provide Surveying and Mapping services. HCWL, an employee -owned municipal engineering and land surveying firm established in 1943, offers a full range of professional land surveying services that include topographic and boundary surveys, parcel descriptions for easements and acquisitions plotting, along with construction staking. Les Hillebrand will be the Survey Manager. Les has 30 years of survey experience and is responsible for overseeing all aspects of HCWL's survey department including surrey crews, fieldwork, and work products. He has extensive experience in both engineering surveying and land surveying including topographic surveys, ALTA surveys, boundary surveys, construction surveys, and route surveys `,1t1` at uCit� rJ.l`s"eiatcs. L.1ci� Macaulay and Associates, Ltd, will prepare Property Appraisals for the project. Macaulay and Associates, established in Everett in 1962, provides appraisals and real estate consultation services for governmental and public agencies, financial institutions, corporations, developers, institutional investors, non-profit organizations, and individuals. Bob Macaulay will lead the appraisal process. Bob has been involved with numerous large road and utility infrastructure projects and feasibility studies, as well as large, multi -parcel right- of-way partial and total acquisition assignments. SPECIALIZED EXPERIENCE & Page 8 [� TECHNICAL COMPETENCE C 0NSULT,'.r11"S Included in 20 pages l._t_)1-4\%V OD Proposal S12-2010 Queensborough Sewer Rehabilitation Project (I* P' Interactive Pipe Inspection (IPI) will provide lNiFaACT E Po3E:NSS EC, Pipe and Manhole Inspection services. IPI is a division of Pipe Experts LLC, a leader in inspection of wastewater and water piping systems and trenchless technology since 1995. IPI was established in 2009 as a corporation specializing in advanced technology for the inspection of underground pipe systems. Dennis Smith will oversee the pipe and manhole inspection. Dennis has over 30 years experience in the wastewater inspection and rehabilitation field. Cascadia Archaeology will provide an Archaeological ---cam cA��A A�ci�Ae°�°cv - Survey. Cascadia Archaeology is a consulting firm that specializes in archaeology and historic preservation in the Pacific Northwest. For the past 12 years, it has provided a wide variety of cultural resources management and planning services to help clients achieve their preservation goals. Margaret Nelson will be the lead Archaeologist. Margaret has worked in the Pacific Northwest as an archaeologist for the past 28 years. Her experience includes managing numerous Section 106 process projects and preparation of cultural resource overviews, and evaluations for NEPA EA and EIS, and SEPA. Project Team — Resumes Resumes for our team members identified above are provided for review under the Resume tab in the submittal. SPECIALIZED EXPERIENCE & Page 9 0 1�7 TECHNICAL COMPETENCE C��P�s1_ LTNTS Included in 20 pages B. Work Plan/LOE IX R\1r00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project B. Work Plan/Level of Effort (LOE) Work Plan — Narrative TASK 100 — PROJECT MANAGEMENT Because of the project's location and the rather unique situation, this project has a number of different elements and aspects that need to be both properly managed and conducted. The project will require the expertise of a number of different specialties, disciplines, and seasoned, experienced, senior level personnel. The BHC team has and brings the varied expertise and senior level personnel to this project to properly accomplish the work and assure that this is a successful project for the District. Project Kick -Off The BHC team will start by meeting with District staff to obtain the staffs ideas, thinking, desires, objectives, concerns, issues, etc. for the project. Discuss design requirements. At this same time, the BHC team will review and discuss project information and data that was obtained through various sources and made available such as the plans, flow data, and TV video of the sewer. More detail about our steps to project management is presented in the Record of Past Performance Narrative of this proposal. TASK 200 — ENGINEERING SERVICES It is understood that this is a sewer pipeline rehabilitation project and that while it is possible that some sewers may need to be replaced based on condition or location, the District's primary project objectives are: ® Providing access for inspecting and maintenance of the sewer ® Rehabilitating and protecting the manholes that are in the stream bed ® Re -aligning the stream (if necessary) and/or protecting and reducing erosion of the stream bed and banks where there are sewer manholes (and possibly sewer piping) that are at risk ® Eliminating major sources of infiltration/inflow (1/1) (and exfiltration) It is further understood that this project is not intended to be a stream restoration project. The District is interested in protecting and reducing erosion of the stream bed and banks in the areas of the manholes and sewers that are in or near the stream (and the new maintenance access), and is willing to do some additional restoration/mitigation to offset impacts and improve the situation to satisfy the regulatory agencies, but the District is not interested in performing wholesale restoration of the stream. WORK PLAN WP 1 0 Not Included in 20 pages .J, a k2w, C C)IN'S U LT=,,r,iT; i _I)t _RAN` 00D Proposal ` S12-2010 Queensborough Sewer Rehabilitation Project Pipe and Manhole Inspection The comprehensive sewer plan indicates that this 2,600 foot section of 12-inch ductile iron pipe does not have a capacity issue and does not need to be upsized. Although almost 40 years old, it is anticipated that the pipe should, in general, be in reasonable condition and not need to be replaced. It is understood that the District recently TV'd a portion of the upper section and found this to be the case. The District also did not encounter any root intrusion or see obvious evidence of 1/1 or potential sources of 1/1 (spalled lining or dislocated joints). The District was not able to TV the entire section due to limitations of its equipment. It is possible though that certain portions may need to be repaired or possibly replaced, either because of its condition or perhaps its location. Given the slopes of the pipe, it's possible that the lining along the invert of the pipe may be eroded due to scouring. It is anticipated that there will be 1/1 found at pipe joints, manhole penetrations, and manhole joints. (Since this is an interceptor line, there are no laterals connected to it; however, we understand that there may be one lateral connected to it in the lower section.) We are anticipating, however, that due to the pipe material and installation date, most of the 1/1 will be at the manholes. It will be necessary to conduct a TV inspection of the pipe as well as a detailed physical inspection of the interior (and visible exterior) of all of the manholes to determine where rehabilitation is needed and the best approach for the rehabilitation. Since it is anticipated that most of rehabilitation work will be to correct 1/I, this work would be scheduled during the winter months. Our approach is to use the sewer inspections to isolate and identify localized areas needing rehabilitation. The recommendations would then be formulated to target these specific areas, rather than entire pipe runs. We believe that this is approach will be more economical for the District. The BHC team has the firm Interactive Pipe Inspection (IPI) for this work. IPI has the equipment and capability to TV the entire section from either of the available access points. They also have equipment for root removal should roots be encountered that prevent the TV camera from progressing further. There are essentially three options for TV'ing the pipe. Option 1: If the night time flows are low enough, the entire section of pipe would be TV'd from Meridian Avenue. Option 2: If the night time flows are not low enough, and the system capacity is such that the pipe could be plugged for a short period of time without surcharging upstream services, the pipe would be plugged and a section of the pipe between manholes TV'd. The plug would be removed after each section was TV'd to allow the upstream system to drain. This process would be repeated until the entire length of pipe was TV'd. Option 3: If the night time or wet weather flows are too high, pumps and a temporary bypass line would have to be installed to TV the pipe. Because of the equipment noise (engine -driven pumping equipment), this work would be done during the day time. We would suggest that the District consider the increased cost and need and potential additional value of conducting the TV inspection during high flows/wet weather. Doing so may not yield better or more information on the condition of the pipe or 1/I. This, coupled with the additional cost for a temporary bypass, may not justify TV inspection during such times. WORK PLAN WP 2 3 Not Included in 20 pages C0N,S, Ul,G-cl1 1..[ LI-\M!00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project It is understood that the District has two flow meters in place, one at each end of this section of sewer, and is currently in the process of collecting flow data. These meters will remain in place and data will be collected for some months, for analysis and comparison of dry and wet weather flows. This data will be provided to BHC for review and analysis. This analysis will provide flow information for the TV inspection and determine the magnitude of 1/I. In analyzing the 2006 peak flow data that is in the comprehensive sewer plan, we found that the 1/1 in the microbasin in which this section of sewer is located was high (-r11,400 gallons/ac-day or 1,800 gpcd). The EPA considers 1/1 above 400 gpcd to be excessive. We were also able to obtain from King County, the flow meter data from their 1/1 study that was collected in the winter of 2001/2002. This flow meter was located at the manhole at the bottom of the ravine just off 4th Avenue SE. Although the District's flow metering data will be specific to this reach of sewer, this flow data may still be found to be of some value. Based on this finding, we are assuming that the 1/1 in this section of sewer will be fairly significant. However, if the 1/1 is found to be minor, our proposed testing and approach would likely be modified. Assuming that the flow data suggests that there is appreciable 1/I, all of the manholes will be visually inspected by IPI. [nspection of the manholes will require that there be reasonable access as there will be need to bring in equipment for confined space entry (e.g., tripod, portable generator, blower(s), and lights). Vacuum testing the manholes is another test that is a relatively quick test and could help to assess any leakage if the visual findings were inconclusive and/or help locate the sources of 1/1 (if the groundwater is high enough water will be drawn into the manhole). This testing, however, would require better access given the equipment that is required for it. The need and value of vacuum testing would be determined after the manhole inspections. We are proposing to conduct the manhole inspections using a "plug and release" approach to identify the reaches with significant 1/I. This entails two inspection crews working and coordinating together. One crew would plug an upstream manhole while another crew in the downstream manhole observes the flow. If there is little or no flow after the flow has subsided (-5 minutes), then this would suggest that there is little to no 1/1 in this section of pipe. If however there is flow, this would suggest that there is 1/1 in this section of pipe. A portable V- notch weir could be installed to estimate the flow. At the same time, the manholes would be inspected and any 1/1 at the manhole penetrations, joints, cracks or otherwise would be observed and documented. Vacuum testing of the manholes would follow after the visual inspections and review of the findings. Depending on the findings of the manhole inspection and condition of the manholes, vacuum testing may or may not be recommended. If there appears to be significant 1/1 in a section of pipe, air testing could also be used to determine the area that is leaking. Except for perhaps the initial air testing of the pipe sections (i.e. manhole to manhole), air testing would require temporary bypassing to isolate the location(s) of the leak(s) if the initial test of the section fails. Air testing of the pipeline has not been included in the level of effort. This information will help the TV inspection to focus on those particular pipe sections that were found to leak and/or have appreciable 1/1 and determine if the source(s) of 1/1 or leaks can be located during the TV inspection. By isolating the major sources of 1/1, spot repairs [using for example cured in place pipe (CIPP)], can possibly be used instead of having to rehabilitate the entire section wholesale which will help to reduce construction costs. Sewer inspections will be performed in accordance with NASSCO's Pipeline Assessment and Certification Program (PACP) standards. The camera used will have color, pan, tilt, and zoom capabilities. WORK PLAN WP 3 Not Included in 20 pages ,c N'S,ULT;-. dTv l__DI_I\`\\." )OD Proposal S12-2010 Queensborough Sewer Rehabilitation Project In addition to participating in some of the sewer and manhole inspections, sewer videos and assessment reports along with the manhole inspection photographs and reports will be reviewed and assessed by BHC (Larry Amans). Access/Maintenance Road It is understood that the District desires to have a 10 to 12 foot wide maintenance road along the alignment for access, preferably, by a 4WD pickup truck. This road would be developed and used for access during the pipe rehabilitation work. Although it is possible that some retaining structures (e.g., gabions) will be necessary in places, the District is not interested in having to install structures to cross the stream. Access does not necessarily have to be from one end to the other. Access to the sewer could be provided from both directions. Another possibility that the District might consider is a narrow road/trail (— 6 feet wide) that could be accessed by a 4- wheel UTV/ATV to reduce construction requirements, environmental impacts, and mitigation requirements. This type of narrow road/trail may be more readily accepted by the regulatory agencies and others. Based on our reconnaissance of the sewer alignment, it appears that the sewer is situated to a greater extent on the south side of the creek. The terrain and grade on the south side of the creek seemed better suited for an access road and was probably used for access during construction of the sewer back in the early 1970s. As such, it would appear based on this initial field review that an access/maintenance road would be best situated and most likely located on the south side of the creek/ravine. BHC (Larry Amans, Reed Kelly) will investigate and evaluate the constructability of an access/maintenance road. Stream Bed and Bank Restoration Geomorphic investigations, hydrologic and hydraulic analyses, stream re -alignment, stream bed and bank restoration will be performed by Herrera (Chris Brummer) and BHC (Dave Harms). Herrera (Chris Brummer) conducted a field reconnaissance of the ravine in 2004 to document sediment sources for the City of Bothell's Stormwater Management Plan. A comprehensive geomorphic investigation of the ravine will be performed to document existing geomorphic processes, project constraints for maintenance access and project construction, other utilities, adjacent land use, potential mitigation sites, and design opportunities that provide solutions to overcome the identified constraints and construction challenges. The geomorphic investigation conducted in this task and the critical areas characterizations (Task 400) should occur prior to any brush clearing to document existing conditions. A preliminary hydraulic analysis using HEC-RAS will be performed to determine flow depths and velocities in support of the restoration design. Cross -sections required for the development of the HEC-RAS model will be flagged in the field during the geomorphic investigation and tied in during the field survey. Hydrologic modeling of the basin will establish design flows for the ravine. WWHM3 will be used to perform the hydrologic modeling and to establish the design flows for input to the HEC-RAS model. WWHM3 is Ecology's standard hydrologic model that generates a hydrologic response based on drainage basin land use and soil types. After the WWHM3 model is developed, the results will be compared to anecdotal data as a check on the model. WORK PLAN WP 4 01.. Ca Not Included in 20 pages ( )N'SULT- 'ITS 1__ h \V C)0 D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Pipe and Manhole Evaluation and Rehabilitation BHC (Larry Amans, Reed Kelly) will be responsible for the pipe and manhole investigations, evaluation, and rehabilitation. Our general approach is to isolate and identify the major sources of 1/1 or deterioration in the pipe sections and target them for spot repairs using CIPP rather than rehabilitating the entire section between manholes wherever possible to reduce costs. We would not advocate pressure grouting of joints since our experience has shown this to be a short-term fix/repair. Based on the findings of the manhole investigation, it is possible that some repairs might need to be made by excavating and replacing a particular pipe section. This would only be recommended if it was determined to be truly necessary after taking into account equipment and material needs and construction access. We anticipate that most of the 1/1 is occurring at manhole penetrations and manhole joints. Some deterioration of the interior concrete and spalling could also be found. There could also be some root intrusion at joints as well as cracks in the manholes due to settlement. Based on our reconnaissance of the sewer alignment, all of the manholes need to have the frame and cover replaced. Those that are exposed in the stream and other places may need to have the cone and riser section replaced. If the manhole penetrations are deteriorated and leaking, these would need to be chipped out to sound concrete and repaired. If the interior of the manhole has numerous issues, the major issues would need to be repaired and the manhole either epoxy -lined or have a cured in place liner installed. Both of these methods are costly and need to be used only where absolutely required. There are other repair/rehabilitation methods that could and will be considered and used as well. We will work closely with the District to determine the preferred repair methods. TASK 220 — MITIGATION AND RESTORATION WORKSHOPS Based on the findings from the pipe inspection and geomorphic and geotechnical investigations, the BHC team.would work with the District to develop a conceptual (10 percent design) restoration plan that mitigates impacts from pipe repairs and construction of the access road. The plan will include design elements that address ongoing migration of the creek into the manhole cones and channel incision that is currently destabilizing steep slopes within the ravine. The concept plan will be presented to the District staff in a workshop setting along with a summary of construction materials and methods, preliminary opinion of probable construction cost, preliminary construction time frames, estimated environmental impacts, potential utility conflicts, and the extent of temporary (construction) and permanent easements. The concept drawings presented at the workshop will provide the basis for the evaluation of various restoration options and the recommendation for a preferred restoration plan. The preferred plan and the process leading up to its selection will be summarized in a technical memorandum. It is proposed that another similar workshop be held at the draft predesign report stage. WORK PLAN WP 5 :+ 1" [�. Not Included in 20 pages GQIN3 Ut.T,!NT5 I._DI--`RWOOD Proposal S12-2010 Queensborough Sewer Rehabilitation Project TASK 230 — COORDINATION WITH JURISDICTIONS AND AGENCIES The BHC team will assist the District with presenting the preferred conceptual design, mitigation, and restoration plans to local and state agencies to solicit additional feedback and gain consensus. Comments received from the coordination with the jurisdictions and agencies will be used to refine the preferred restoration plan and develop a predesign report documenting the design criteria, selection process, and supporting information (inspections and geomorphic and geotechnical investigations). The predesign report will also include refinements to the preliminary opinion of probable construction cost, construction schedule, estimated environmental impacts, and the extent of temporary (construction) and permanent easements. TASK 240 — PREDESIGN REPORT The information, investigations, analyses, findings, and conclusions for the completed tasks/activities will be summarized and documented in a preliminary design report, with tables and figures as appropriate to illustrate the conditions, investigations, assumptions, analyses, alternatives and findings. The 30% design drawings will be appended as well as other documents, as appropriate, that were completed in other tasks. A draft report will be prepared by the BHC team and submitted to the District for review and comment. Following the District's review, the BHC team will meet with the District to discuss the draft report and the District's comments. Review comments will be addressed, and incorporated into a final report. TASK 250 - 30% DESIGN DRAWINGS Following acceptance of the.restoration plan by the District and consensus with the appropriate public agencies, the BHC team will develop 30 percent design drawings in accordance with District standards. The 30 percent design drawings will incorporate findings from the geomorphic and geotechnical investigations, engineering analyses, and topographic survey. The 30 percent design drawings will include the access road design, stream restoration and mitigation design, and any rehabilitation to the sewer interceptor or manholes deemed necessary based on findings from the pipe and manhole inspections. TASK 300 — SEPA SUPPORT SEPA support will be provided by BHC (Greg Waddell) along with Herrera (Julie Hampden). The lead agency will be the District. Based upon initial project evaluation, a SEPA Environmental Checklist form will be prepared, and it is anticipated that the appropriate threshold determination of the project will be a mitigated determination of non -significance (MDNS). The checklist, per WAC 197-11-960, will include project information on background and environmental elements (earth, air, water, plants, animals, energy and natural resources, environmental health, land and shoreline use, housing, aesthetics, light and glare, recreation, historic and cultural preservation, transportation, public services, and utilities). Prior to beginning work on the checklist, we will coordinate with the District to agree upon the specific environmental elements that are applicable to the project. SEPA documentation and required accompanying documentation will be prepared in compliance with City of Bothell requirements as specified in the Bothell Municipal Code Section 14.02 and will be prepared consistent with City of Bothell Permit Center guidance. We propose to complete the environmental site assessments and surveys early in the project timeline, not only to substantiate interceptor rehabilitation and environmental mitigation designs, to] 11 [�7 WORK PLAN WP 6 = Not Included in 20 pages C,�0N SUI.T.!,FIT6 L. [) E R \VOO D Proposal S12-2010 Queensborough Sewer Rehabilitation Project but also to serve as the basis for the environmental technical documentation prepared for the project including the Environmental Checklist and permit applications. We will complete a draft and final Environmental Checklist in this task, assuming that the 30- percent design provides a level of detail that is sufficient for SEPA documentation. Per the scope of work accompanying the RFP, we will assist the District with the scheduling and publication and or coordination of requisite public notices and meetings. The District will sign the Environmental Checklist and route the SEPA decision to the regulatory agencies. TASK 400 — PERMITTING Permitting services will be provided by Herrera (Julie Hampden, Kris Lepine). The Queensborough sewer rehabilitation project will require permits and approvals at the federal, state, and local levels. Early coordination with permitting agencies will be essential to obtaining permits in an efficient and timely manner. Permitting (along with possibly easement acquisition) will likely drive the project's schedule. Based on an initial evaluation of the project, it is anticipated that all necessary environmental permits can be obtained to allow a construction start date in spring 2012. The permitting task will be partially implemented in Phase 1 of the Project and completed in Phase 2. Given the scope of work included in the RFP culminates in 30 percent designs, it is assumed that the permitting support task for Phase 1 will include preliminary coordination with permitting agencies, development of a permit management plan, and development of preliminary draft permit applications. The level of detail required by permitting agencies generally requires that project designs be 60-percent or greater prior to making application. As such, the JARPA and supporting documentation in addition to local permits applications will not be finalized or submitted until 60-percent designs have been completed in Phase 2 of the project. At the federal level, project work adjacent to and in the creek will require a Clean Water Act Section 404 permit from the U.S. Army Corps of Engineers (Corps). We are anticipating that a Nationwide Permit will be required. In support of the Corps permit, a critical areas report for the project is necessary including delineation of all wetlands, identification of ordinary high water mark, and plans for mitigating impacts to wetlands and streams. The Corps involvement will trigger the need for an archaeological survey in accordance with Section 106 of the National Historic Preservation Act. The archaeological survey will be conducted by Cascadia (Meg Nelson). In addition, the Corps involvement will necessitate compliance with the Endangered Species Act (ESA) and Magnuson Stevens Fishery Conservation and Management Act (MFCMA). At the state level, work within the creek will require a Hydraulic Project Approval (HPA) from the Washington Department of Fish and Wildlife (WDFW). Impacts to wetlands may require a Water Quality Certification from the Washington Department of Ecology (Ecology) according to the Clean Water Act (Section 401). In addition, depending on the extent of the project, earth -moving activities may require a National Pollutant Discharge Elimination System (NPDES) permit from Ecology according to the Clean Water Act (Section 402). The project is located within a coastal county; therefore, will require consistency with the Coastal Zone Management Act, which is also coordinated with Ecology. The project will also require local permits including a land use WORK PLAN WP 7 Not Included in 20 pages ; oINS ,LTANTS I._DERWC- OD Proposal S12-2010 Queensborough Sewer Rehabilitation Project development permit (e.g., Clearing and Grading) from the City of Bothell and associated approvals including SEPA (described above) and critical areas ordinance compliance. In Phase 1, we will assist the District in preliminary meetings with permitting agencies. Once final permit applications are completed in Phase 2, we will provide the District with permitting support in the form of permit submittal meetings and ongoing coordination with permit reviewers to help expedite the approval or review process. The level of effort presented in this proposal is not inclusive of all the necessary permitting effort. The level of effort that will be required for Phase 2 has not been included. We propose the following sequence of sub -tasks in support of expedited permitting: 1. Prepare Permit Management Plan 2. Conduct pre -application meetings with the Corps, WDFW, and City of Bothell 3. Conduct delineations and baseline characterization of critical areas 4. Prepare a Critical Areas Report 5. Prepare Endangered Species Act (ESA) and Magnuson -Stevens Fishery Conservation and Management Act (MFCMA) compliance documentation 6. Prepare preliminary draft Joint Aquatic Resources Permit Application (JARPA) Each of these sub -tasks are discussed in greater detail below. Permit Management Plan The Plan will consist of: 1) a plan summarizing project -specific permit requirements, and 2) a project -specific permitting -timeline showing the strategic sequencing of anticipated projects. We would first familiarize ourselves with the project by reviewing project site materials provided by the District and meeting with the District to discuss the project. Next, we would visit the project site to review the permitting issues involved, and then we would review applicable city, county, state, and federal regulations. Pre -Application Meetings At this point, having reviewed available information so that we understood the project and the permitting issues involved, we would meet with the City of Bothell Planning and Development department as well as federal and state permit reviewers. The purpose of these initial meeting(s) would be to verify the District's initial determination of the permitting issues involved, to obtain up-to-date information on the processes and timing for all permits required, and to determine who the permit contact would be at the City of Bothell and each regulatory agency. Obtaining current information regarding local permit processes is important to do each time a permit management plan is developed because for many cities and counties permit processes and timing may change frequently. These meetings also serve to introduce the involved local, state, and federal agencies to the project and to determine proactively what their concerns may be about the project. At this point, a permit management plan can be completed. The permitting plan would include the following information: 1) A brief description of the project. 2) A list of the required permits. 3) For each required permit the plan would include: 1. The name of the permitting agency 2. The name of the contact at the permitting agency WORK PLAN WP 8 Not Included in 20 pages C01'. S1ii ,T;hiT f..I:)I R%\ C- 0D Proposal S12-2010 Queensborough Sewer Rehabilitation Project 3. A description of all materials required for submittal including the content, scale, size, and number of all supporting materials (plan sheets and narratives) 4. The application fee 5. A description of the permit process (e.g. the need for formal pre -application or intake meetings, whether the decision process would be administrative or would involve a public hearing) 6. The expected timing of permit processing 4) An overall permitting schedule with detail regarding the steps in the preparation of each permit submittal and a demonstration of how permit processes would dovetail with project design and environmental documentation, such as SEPA, ESA, and NHPA Section 106/05-05. Through the course of the project, the permitting schedule would be revised as necessary. Environmental/Critical Areas Assessments During field investigations, our biologists will assess existing habitat conditions and ecological functions provided at the project site, determine suitability of habitat for wildlife, delineate wetlands, and identify the ordinary high water mark of the creek. Site assessments will be conducted in accordance with Bothell Municipal Code (BMC) section 14.04. The boundaries of identified wetlands located within the project site limits will be delineated. The wetland conditions within 300 feet of the project site will be estimated to determine if buffers associated with off -site wetlands will be affected by the project. The wetland determination and delineation will be conducted using the routine determination method outlined in the Washington State Wetland Identification Delineation Manual, the U.S. Army Corps of Engineers Wetland Delineation Manual, and the Interim Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region. Delineated wetlands will be classified according to U.S. Fish and Wildlife Service (USFWS) and hydrogeomorphic classification systems, and rated in accordance with the BMC and Washington State Department of Ecology (Ecology) Washington State Wetland Rating . System for Western Washington. The functions of wetlands will be assessed using the Ecology rating system. The Bothell Municipal Code (14.04) will be used to identify the regulated buffer widths of the wetlands. The boundaries of the wetlands and all test plots will be flagged. Biologists will delineate the ordinary high water mark (OHWM) of the creek during the field investigation. The OHWM will be determined using the definition set forth in WAC 173-22- 030(11). This involves using sequentially numbered flags to identify the OHWM as evidenced by abrupt changes in topography, dominance of perennial vegetation, sediment deposits, drift lines, and signs of scouring. The boundaries of OHWM will be flagged. These delineations and site assessments will be compiled in a Critical Areas Report, which is anticipated to include information on the creek, wetlands, and habitat conservation areas. As part of this environmental site assessment, impact minimization and mitigation opportunities will be identified by Herrera biologists and communicated to project engineers to inform project designs. The Critical Areas Report will include mitigation measures for impacts to the creek, wetlands, buffers, and habitat conservation areas in accordance with the BMC. Preliminary draft permit applications and a preliminary draft Critical Areas report (for local permits and Critical Area Project Review) will be prepared in Phase 1. The final local utility permit application materials (per City of Bothell requirements) and the final Critical Areas Report will be submitted WORK PLAN WP 9 c S Not Included in 20 pages u0NS:., LT..A N T5 V(�)0 D Proposal S12-2010 Queensborough Sewer Rehabilitation Project once project impacts and associated mitigation have been comprehensively designed to the 60- percent design level (Phase 2). Endangered Species Act and Magnuson Stevens Fishery Conservation and Management Act Compliance Based on a preliminary evaluation of the project site, the project should qualify for a No Effect letter because listed threatened and endangered species (e.g., Chinook salmon steelhead, and bull trout residing); and critical habitat are located far enough away from the site that they would not be affected. The no effect evaluation will be based on site reconnaissance, available published documentation, and contacts with resource agency staff and other knowledgeable individuals. Biologists will coordinate with the Corps to make a no effect determination, because the Corps will be the lead agency responsible for ESA. Similarly, we will prepare documentation assessing potential impacts to Essential Fish Habitat (EFH) for MFCMA compliance. Project related impacts to the creek are not anticipated to adversely affect EFH. We will coordinate this determination with the Corps, as lead agency. These letters will be completed in Phase 1, and submitted to the District for subsequent submittal to the Corps. Joint Aquatic Resources Permit Application (JARPA) BHC (Greg Waddell) along with Herrera (Julie Hampden) will prepare a preliminary draft of the Joint Aquatic Resources Permit Application (JARPA) form and supporting figures in support of acquiring permits from the Corps, WDFW, and Ecology. A final JARPA form will, however, not be prepared until 60-percent designs have been developed in Phase 2 of the project. We will prepare the application form including information pertaining to the applicant, property owners, project location, project description, wetlands, streams, and necessary permits. The JARPA figures will be prepared according to Corps formatting guidelines including a vicinity map, property ownership information, plan views, and representative cross -sections. The JARPA figures will identify all work proposed in wetlands and waterward of the ordinary high water mark including quantities of excavation and fill. TASK 500 — COMMUNITY OUTREACH Community outreach will be provided by BHC (Gary Bourne, Reed Kelly). We recognize the importance of clearly and effectively communicating the project's issues and requirements to property owners that are directly impacted by the project as well as others that are within the general area of the project, and other interested parties. Although this is not a capital project it is certainly not a typical maintenance project. Because of the proximity of the existing interceptor to the creek and the associated environmental concerns it is imperative that the Project team communicate with the surrounding neighborhoods in an effective manner. This will require that the team understand the methods of communications normally employed on projects by the District. The result will be more effective communications particularly in the beginning of the project. =3S[ WORK PLAN WP 10 ■ Not Included in 20 pages ,'�tr stJi,TA.h.TS R11'(-)0D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Residents surrounding the project will be most interested in the impacts that the project may have on their neighborhood. Some of the impacts that could be anticipated during pre -design could include the following. Pre -Design Neighborhood Impacts ® Increased activity in the neighborhood from all of the field trips by pre -design personnel which will include numerous field trips by; surveyors, clearing specialists, civil engineers, geotechnical engineers, and permit and environmental specialists. ® The existing sewer pipe easement alignment through the creek regime will need to be cleared which presents the potential of attracting the neighborhood kids. Although this contract does not include final design and construction management during the course of communications with the residents the topic will arise and needs to be addressed by the project team and a public fashion. Some of the impacts that might be anticipated during construction might include the following. Construction Neighborhood Impacts ® General increased noise and traffic ® Working hours will need to be addressed ® Trucks hauling import material will cause increased noise and street sweeping ® Transferring material from trucks to equipment suitable for transport to the site will increase activity and may require a specific site be obtained ® The new maintenance road will attract every kind of wheeled vehicle and will need to be secured when not in use by the contractor ® Work in the creek will need to be detailed and mitigation will need to be addressed At this point it is not feasible to develop the solutions to these impacts but rather address the methods by which the District's team will communicate with the neighborhood residents. From our work with communities we have found that communications need to be "early and often." Some of the tools that work well for communicating with property owners include: mailers, a project website, project emails, general meetings, and individual discussions. For this project we anticipate the following general tasks to be accomplished under the Community Outreach Task: 1. Develop with the District a summary of the key elements and goals of the project and why the project needs to happen now. 2. Develop with the District the details of the communication plan and how best to interact with the public in general and in particular the neighborhood. a. Discuss potential of Citizens Advisory Committee 3. Establish with the District the boundaries of the neighborhoods that should be included in the core impacted neighborhoods and prepare a list of such properties. Anyone outside that are can ask to be included on the list. 4. Assist the District in holding two public meetings to discuss the project. a. Key elements of the first meeting to be held at the beginning of the work could include the following. i. Prepare a mailer for the District announcing the public meeting WORK PLAN WP 11 0 1 Not Included in 20 pages C()NSULTr.NTS I_Dl_I �VOOD Proposal S12-2010 Queensborough Sewer Rehabilitation Project ii. Prepare display materials and boards for the meeting iii. Prepare Power Point presentation as a visual aid to assist in the description of the need for the project, elements of work, environmental concerns and the challenges anticipated during completion of the work. Other information presented would include; schedule, anticipated budget, funding sources, and contact information iv. Prepare attendee handouts with a recap of the information presented at the meeting including information on how to sign up to receive project updates. v. Provide time for a Q&A session with the attendees vi. Should a Citizens advisory Committee be contemplated this is a good time to hand out a sign-up sheet to volunteer for the CAC. Even if a CAC is not established such a list can also be used to enlist the assistance of individuals that are community minded and who may be able to assist the team in understanding the character and concerns of the neighborhood. vii. Assist the District with the preparation of written responses to public comment. b. Key elements of the second meeting which would most likely be held at our near the completion of design development could include the following. i. Prepare a mailer for the District announcing the public meeting ii. Prepare display materials and boards for the meeting iii. Prepare Power Point presentation as a visual aid to assist in explaining how the proposed project elements were selected and presenting updates on the schedule, budget, and other information presented at the first meeting. iv. Prepare attendee handouts recapping the information presented at the meeting. v. Provide time for a Q&A session between the attendees and the presenters. vi. Assist the District with the preparation of written responses to public comment. TASK 600 — EASEMENT ACQUISITION Rights -of -Entry (ROEs) will need to be obtained prior to any work being performed. BHC (Gary Bourne) will be responsible for ROEs and easement acquisition. HCWL (Les Hillebrand) as part of their surveyor responsibilities will provide necessary legal descriptions. Easement appraisals will be prepared by Macaulay and Associates (Bob Macaulay). Work under this task will include the following: is Obtain Rights -of -Entry from the owners of property over which access is needed during the Pre -Design work. There may be more or less ROEs than the number of properties affected by easements. At this time we will assume the number is the same. For this project it is not recommended that ROE forms be mailed to effected property owners before first contact because the majority of property over which an ROE is required will be on property for which additional easements are required. Consequently it is WORK PLAN WP 12 , [ Not Included in 20 pages Gc�h u�Jt,z,,NT S I [_� 1: I\` \-V (_.)0 D Proposal S12-2010 Queensborough Sewer Rehabilitation Project recommended that those property owners be contacted personally before a blind mailing of the ROE forms and before any public meeting is held on the project. ® BHC will develop a list of properties for which a ROE and/or easements will be required. This list will be used to develop owner contact information and to obtain Title Reports for each ROE or easement required. ® Performing Field Surveys to locate the boundary of the existing easements, proposed easements, and property lines when needed. Writing legal descriptions, calculating areas of take and preparing exhibit drawings for new permanent and temporary easements. ® Perform real-estate appraisals of the value of the easements to be obtained. BHC will assist the appraiser in understanding project impacts on the properties. ® Prepare easement documents and supporting information which will assist in communications and negotiations with property owners. IN Communicate and negotiate with property owners of property over which new permanent and temporary easements will be required. It is expected that BHC and the District will discuss in detail the Districts policies for negotiating easements and that any negotiations are within predetermined Districts guidelines. ® Be prepared to assist the District's legal counsel in condemnation proceedings. It is understood that depending on the District's workload at the time, the District may perform the work of obtaining ROEs themselves. If not, the District will provide BHC with its standard ROE forms and document(s). In the latter case, we will coordinate with the property owners and will obtain the ROEs for the District. It appears that there are about fifteen properties that could be impacted by the project over which new temporary and/or additional permanent easements may be required. Based on record drawings provided by the District, it is appears that the District has a 20 foot easement along the sewer alignment (10 feet each side of the sewer). It is generally anticipated that an additional 30 to 40 feet of temporary easement will likely be required to allow for the sewer improvements (50 to 60 feet total). However, this remains to be determined and will depend on a number of factors. For instance, additional temporary easements may be necessary for construction of the maintenance road and additional permanent easements may be required depending on the location of the pipeline relative to the existing easement and creek. In addition the details of a typical road section and construction requirements will impact easement requirements. Based on our reconnaissance of the sewer alignment, it appears that the sewer is situated to a greater extent on the southerly side of the creek. The terrain and grade on the south side of the creek appears to be better suited for an access road. As such, it would appear based on this initial field review that a greater amount of easement would be required on the southerly side of the creek/ravine. However, where the manholes are situated within the creek bed itself, additional easement will likely be required on the northerly side as well. The calendar time to obtain right of way has become longer in the recent past due in part to changes in RCW addressing right of way acquisition by public agencies as well as a rise in property values. Consequently it is important that communications with the owners of the properties affected regarding ROE and the need for easements begin as soon as possible. We will need to have detailed discussions with the District relative to its' policies and procedures for WORK PLAN WP 13 1�7 Not Included in 20 pages }I S1)LT:N'TS Proposal S12-2010 Queensborough Sewer Rehabilitation Project obtaining ROE and Easements considering the neighborhood nature of the alignment. It will be important to have a consistent message when talking to each property owner. In addition two large parcels are owned by the Snohomish County Parks Department. Obtaining necessary ROE and easements may require considerable discussions regarding the nature of the work and the location and nature of the road. Discussions with Parks may lead to the potential of a collaborative effort under which Parks could benefit from Project environmental and permit mitigation and thereby reduce actual cash outlay for new easements. Although it is anticipated that new easement documents will be prepared following the District standards it is also expected that additional documents may need to be prepared and work performed as part of the negotiation process. Communications with Parks and investment group property owners would normally take place during normal working hours. However it is expected that communications with private property owners would take place during the evening or weekends and often times it will take a number of meetings. Site visits with property owners to visually expect the easement locations are anticipated. This effort will require that property lines and easement boundaries be clearly delineated. Often times this survey effort needs to be repeated a number of times due to the attractive nature of flagging to the youth in the neighborhood. TASK 700 — CONSTRUCTION COST ESTIMATES AND SCHEDULE Preliminary opinions of probable construction cost and the schedule will be prepared by BHC (John Hatch, Larry Amans) and Herrera (Chris Brummer). Cost estimates will be developed based on unit costs obtained from recently constructed projects and will include the appropriate contingencies. TASK 800 — GEOTECHNICAL INVESTIGATION Shannon & Wilson (Bill Laprade, Larry West, Brian Reznick, and Stan Boyle) will be providing geologic, hydrogeologic and geotechnical services. It is understood that there is no existing geotechnical information or detailed construction records for the sewer. Our approach to the geologic and geotechnical investigation for preliminary project concept development will consist of reviewing historic aerial photographs and available geologic information. The geotechnical team will join the design team to complete a reconnaissance of the pipeline alignment to assess existing conditions and observe geologic exposures and creek erosion and depositional environments. Following this reconnaissance, a brief technical memorandum summarizing our observations and interpretation of ground conditions and geotechnical considerations will be prepared. After preliminary concepts for construction of an access/maintenance road, rehabilitation of the sewer, re -alignment of the creek, restoration of the creek including the stream's bed and banks are better established (i.e., at the 30% design level), an appropriate geotechnical exploration plan can be developed for the project. A geotechnical investigation will be made and a report will be prepared in Phase 2 that summarizes and presents the data collected; exploration results; and our interpretation of geotechnical, geologic, and groundwater conditions and preliminary recommendations and guidance for the design and construction of the project. The report will present recommendations for excavation, dewatering (if necessary), creek bypasses, creek shaping and WORK PLAN WP 14 Not Included in 20 pages C0N'& 11LTnf'±T I__D1.1`% `00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project erosion protection, foundations, and other geotechnical related design, mitigation, and restoration measures. TASK 900 — SURVEYING AND MAPPING Following the clearing of brush and deadfall (see below), the alignment will be surveyed and mapped, within 50 feet on each side of the existing sewer. Trees in excess of 8-inches in diameter will be located as well. The surveying and mapping will be provided by HCWL (Les Hillebrand). TASK 1000 —ARCHAEOLOGICAL SURVEY The archaeological survey will be conducted by Cascadia (Meg Nelson). Project work adjacent and in the Creek requires a Clean Water Act Section 404 permit from the Corps of Engineers. The Corps permit triggers the need for an archaeological survey in accordance with Section 106 of the National Historic Preservation Act. TASK 1100 — CLEARING AND TRAIL CONSTRUCTION It is understood that the District would like to have the pipeline alignment cleared of brush and deadfall to improve access for maintenance to the extent allowed by easement agreement and regulatory agencies. The District would also like to have a foot path/trail of some kind. Since better access and a trail of some kind will be necessary for the manhole inspections as discussed earlier, it is proposed that a trail be developed for conducting the work. Prior to the surveying and mapping, a brushing/trail building contractor will be retained to remove brush and deadfall within a 20 foot swath and construct a foot path along the pipeline's easement/alignment. Several local brushing/trail building contractors were contacted to provide us with an estimate of the level of this effort. Manholes that are currently inaccessible due to trees, tree roots, and brush will also be made accessible. This clearing will be done by hand and not include trees greater than 6-inches in diameter or as otherwise desired by the District or regulatory agencies. Clearing in and along banks and edges of the stream will also be done with some care and consideration of the stream and wetland ecology. WORK PLAN WP 15 p ® � Not Included in 20 pages ; 0p N,55 . i;t,TANTS C. Record of Past Performance & Project Examples � R\V(.)0D Proposal S12-2010 Queensborough Sewer Rehabilitation Project C. Record of Past Performance & Project Examples Record of Past Performance — Narrative Our project team is committed to the successful completion of the Queensborough Sewer Rehabilitation Project. Project management, project communication, and quality control will be important to this projects success. Project Management Our proposed Project Manager, Reed Kelly, PE will have overall responsibility for the scope of work, budget and schedule compliance, coordination with the District and subconsultants, and the overall technical aspect and quality of the work. Reed's role will also be to ensure that timely and clear communication occurs with the District and amongst BHC staff and team members; that the District receives exemplary service; and that the work satisfies your needs and requirements. Once the District notifies us of selection, we will meet with the District and go over our preliminary scope of work. While developing the scope and budget, we will concurrently define the project's initial needs and coordinate assignments as appropriate, so that when we receive notification to proceed; our team will be in place and ready to begin work. As a principal of the company, Reed is committed to the project and will ensure that the project has the resources and staff needed for its success. Reed will monitor the project's progress such as work products, costs, and schedule on a weekly basis. BHC establishes project cost control by setting up major phases and tasks with discrete budgets in our project accounting software. Time records and expenses, including subconsultant expenses, are entered every Friday. Each week, Reed will have a record of total charges for the week by phase and task, and the same record for the project -to -date. Every four weeks, the job cost control system will create an invoice for Reed's review, and following this review for correctness, it is forwarded to the District. BHC has established a strong professional reputation for high quality work. Each day we stake our reputation on our ability to operate efficiently and effectively within the parameters set forth by our clients, our government, and the natural world. With extensive years of combined experience, BHC staff have learned the crucial importance of bringing their projects in on time and within budget. We are confident in our ability to meet the schedule required for this project. This confidence is based on a history of success on past projects and our attention to detail when putting together a plan for a project including work scope, schedule, and budget. We will provide a hands-on project manager, partnership with the District, proven management and design capabilities, familiarity with applicable standards, and strong project experience. Project Communication A key element common to all successful projects involves effective communication between the client and project team and other entities such as regulatory agencies. Reed will coordinate closely with District staff through phone communications, regularly scheduled meetings, and various means of electronic and written communications. RECORD OF PAST PERFORMANCE Page 10:3 - 1". 0 1�7 & PROJECT EXAMPLES CNSULT NTS Included in 20 pages ER'\-Vc 0 D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Historically, we have prepared monthly project status reports, which provide a global summary of the project that is helpful in presentations to the Board. These reports typically have included a summary of challenges, changes, a listing of major accomplishments completed during the previous month, work anticipated to be completed for the coming month, and a comparison of original schedule and budget against the current schedule and budget. Each month, a brief monthly project report will be prepared and submitted along with our invoices that will summarize the status of work and the activity on each task and an explanation of work to be completed. As an additional client benefit, BHC has established a formal process of obtaining feedback from our Clients. For active projects, Jon Davies, Director of Business Development, arranges a meeting with our client's project managers about every three months (free of charge) to ask the "how are we doing" questions. QA/QC The BHC Team has a quality assurance/quality control (QA/QC) system in place to ensure that our projects are consistently delivered with the same quality and thoroughness. Each of our technical staff is familiar with our QA/QC policy and QA/QC resources to develop a project specific QA/QC Plan that is followed on every project. Our designs also go through a rigorous internal review process that involves an independent senior level review in addition to Project Manager. These signed review documents remain in the project file and are available for client review at any time. Our assigned QA/QC engineer, Craig Chambers, will be consulted not only at submittal milestones (30%, 60%, & 95% designs), but also early in the project to collaborate on various technical matters and value -engineer design concepts and approach. Wastewater Pipeline Experience Our wastewater pipeline engineering and design encompasses gravity sewers, force mains, siphons, grinder pump/pressure sewers and vacuum sewers. Pipeline design is.usually a two phase process, that is, preliminary design followed by final design. With perhaps some exceptions, BHC will typically prepare a preliminary design report or technical memorandum that develops, considers, evaluates, and presents: flows, hydraulic analyses, potential alignment and material alternatives and considerations, appurtenances, costs, project implementation (environmental conditions, issues and permits, design and construction issues and requirements and schedule), and final design requirements. In essence, the preliminary design report establishes the basis of design and is an important first step. The design of wastewater pipelines typically involves surveying and mapping, geotechnical engineering, environmental assessments and permitting. If portions of the project are not within the rights -of -way or existing easements, easement acquisition will be required. Depending on the project's location specialty consultants may be required, such as traffic engineers, real estate appraisers, and property acquisition consultants. Some of this information and these investigations will be obtained or done during preliminary design while other or more detailed investigations and efforts will be deferred until final design. BHC has worked with, and established solid working relationships with many consultants in the Puget Sound area. BHC is well versed in coordinating and orchestrating the work of multiple consultants on a design team. Often times wastewater pipelines involve the use of trenchless technologies, such as jack and bore, horizontal directional drilling, microtunneling, and other methods to cross underneath RECORD OF PAST PERFORMANCE Page 11 Q & PROJECT EXAMPLES ,CONSULT,^.NITS Included in 20 pages 1._UERWOOD Proposal S12-2010 Queensborough Sewer Rehabilitation Project streams, major roads and highways, railroads and wetlands. At times, existing pipelines can be replaced by pipe bursting or cured -in -place -pipe (CIPP). BHC staff are knowledgeable in the different technologies and understand the conditions and requirements for their use. Project Examples Backyard Sewer Relocation, City of Fircrest, WA BHC Consultants completed a preliminary design report to replace sewers that were constructed in the backyards between homes in various parts of the City. These backyard sewer mains were old and deteriorated and had considerable root intrusion. The landscaping was mature and well developed and there were other improvements such as garages, sheds, walls, fences, etc. constructed over or near the sewers. As such, it was very difficult for City Staff to find and access these sewers for inspection, maintenance, and repair. Sewer improvements for three different areas within the City of Fircrest (areas designated A, B & C) were determined. A preliminary report was prepared. Rehabilitation and replacement of the existing sewer using trenchless technologies such as pipe bursting and CIPP was considered and evaluated. Sewer improvements consisted of gravity sewers as well as pressure sewers located within the right of way. Although the City was looking to proceed with final design and construction of improvements in all three areas, due to budgetary constraints and uncertainty of construction funding, the City was unable to proceed with final design in all three areas. The City determined that the priority improvements were in Area B, and BHC prepared final design for these improvements. The sewer improvements consisted of approximately 3,500 feet of 8-inch gravity sewer and related appurtenances (manholes and laterals). Most of the properties were served by gravity, but approximately six (6) properties were served by grinder pump systems. Owner's name/ Telephone: City of Fircrest, 253-564-8900 ro�ect Manager/Te/ephone _,.�BiIlwLarkirn no�longer of the�Ci Contract value: $288,980 (fee) Construction contract price Not constructed at this time due to lack of at time of completion: funding Names and title of Firms' project Reed Kelly* — Project Manager; Gary Bourne* — personnel on the project with a Community Outreach; John Frech — Project description of their project Engineer; Noah Allen — Staff Engineer; Aaron responsibility: Werner — Staff Engineer RECORD OF PAST PERFORMANCE Page 12 0 [ & PROJECT EXAMPLES CONSULTANTS Included in 20 pages L_I 1`_:RW 00D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Beach Sewer Line Rehabilitation, Southwest Suburban Sewer District, Burien, BHC was selected by Southwest Suburban Sewer District to design improvements for the failing sewer beach line in Seahurst Pak. In the 1950's, installing buried sewer mains in the tidal zones of Puget Sound was commonly done because it offered unobstructed corridors. However, these pipes, which are subjected to brackish water and shifting foundation support, have approached, and in some cases, exceeded their useful life. Dislocated joints, differential settlement, and thinning pipe wall thicknesses have resulted in increasing maintenance issues and the need for routine flushing. For this project, coordination with the stakeholders included Corps of Engineers, Shoreline Management, Department of Fisheries, City of Burien Park's Department, the Marine Research Center, and all the private single-family residences along the route. r Alternatives evaluated included: abandonment of the beach line and re -directing flow from the beach into a different drainage basin; installation of a new beach line; repair of the gravity line in place; and sliplining the existing pipe with a new force main. The selected option involved sliplining the main with a 4-inch force main, constructing a new waterfront pump station, and serving the parcels along this 6,000 foot segment with grinder pumps. Permits obtained included a Corps Nationwide Permit (wetlands), Shoreline Permit, Biological Evaluation (endangered species), JARPA, SEPA Checklist, and WSDOT agreements. Owner's name/Telephone: Southwest Suburban Sewer District, 206-244- 9575 "'Owner's Project Manager/Telephone ' Rbh Hall 206 24�4 9575 Contract value $478 000 (fee) .. s r Project start date`- September, 2008 Project end date Estimated Dec 2011 s-Construction contract price` NIP; j " Y K z � i 4 at time o f award' .�,. Construction contract price N/A at time of completion Firm'sRole , Pnme <, _ , f 4 _(f?rlme,'Subconsultant,;or'OtherL Names and title of Firms' project Craig Chambers* — Project Manager; Chen -Wei personnel on the project with a Shen — Project Engineer; Peter Cunningham — description of their project Staff Engineer responsibility: RECORD OF PAST PERFORMANCE Page 13 Is & PROJECT EXAMPLES C0145ULT.AN1TS Included in 20 pages Proposal S12-2010 Queensborough Sewer Rehabilitation Project Combined Sewer Overflow (CSO) Project, City of Snohomish, WA BHC provided preliminary engineering, final design, and services during construction for facilities to intercept and control existing combined sewer overflows (CSO) in the City of Snohomish. The new facilities include a new 6,500 gpm combined CSO and stormwater pump station, nearly 6,200 feet of 18-inch and 24-inch force main and gravity sewer pipe, 3,000 feet of 18- to 30-inch stormwater pipe, and 1,200 feet of 12-inch water main.. Special design considerations include stabilization of the pump station site using a stone column system, architectural pump station features to conform to the historic neighboring community, and location of separate sanitary sewer, stormwater, and potable water pipelines within one relatively narrow existing City street. The pump station consists of two suction lift pump sets, one at 6,500 gpm (sewer), and one at 5,400 gpm (storm). A key factor in the project was the crossing of an SR-9 interchange under a WSDOT bridge. We secured WSDOT approval of a Channelization Plan and Franchise Agreements. We also convinced WSDOT to agree to closing off -ramps and on -ramps to SR-9 for weeks at a time to allow for phased, efficient pipeline installation. A six -stage traffic control plan was developed to maintain and detour traffic while pipe installation work proceeded. BHC was the lead design firm for the project and retained several subconsultants for specialized design and permitting services. Subconsultant disciplines included surveying, geotechnical engineering, electrical engineering, architectural services, wetlands specialists, traffic control, and archeologists. BHC is also providing services during construction including field observation, office engineering, and the preparation of an operations/maintenance manual. Permits obtained included a Corps Nationwide Permit (wetlands), Shoreline Permit, Biological Evaluation (endangered species), JARPA, SEPA Checklist, and WSDOT agreements. Owner's name/ Telephone: City of Snohomish, 360 568 3115 AOwners Pro�ect,Manager/Telephone � ;Steve Schuller 360'568y31,15 �,�si,�,r.� :�; Contract value $2,523 996 (fee) ti:..y� xPro�e'ct start date :, Aug", 2007 Project end date Estimated December 2011 . �, f ;....:x .-. a_.,.•� ¢at time ofaward,; � -� 1� _:. (Y ; d ., x _._'_�`��,k f.�. �_ � .._' : �. .. ,{ Construction contract price Not yet complete at time of completion fir m's,Role Y `Prime W (PIIm0' Sub'cbnsi►ltant, or::Other)` Names and title of Firms'project Marty Harper— Project Principal; Larry Amans* personnel on the project with a — Project Manager; Jim Lutz — Structural description of their project Engineer; John Frech — Project Engineer; responsibility: Aaron Werner — Construction Engineer RECORD OF PAST PERFORMANCE Page 14 8c PROJECT EXAMPLES �tgS1iLTP.N1T5 Included in 20 pages I_DERA1'O0D Proposal S12-2010 Queensborough Sewer Rehabilitation Project Meridian Ave Sewer LID No. 1, City of Edgewood, WA This project consists of the design and construction of three pump stations, approximately 11,000 linear feet of sanitary sewer force main and 25,000 feet of gravity sewer main. The scope of work included preliminary design, design, permitting, and construction management services as well as assistance with the formation of a Local Improvement District (LID). The preliminary design services consisted of evaluating potential service areas, reviewing probable construction costs, and defining the LID boundary. Design efforts included preparing the construction documents for the gravity sewer, force mains, and sewage pump stations, developing detailed construction cost estimates, applying for the required permits, assisting in the acquisition of easements, and assisting the City with the formulation of the LID. The design team also prepared environmental reports, provided survey, and geotechnical support. Design challenges included highly saturated ground conditions, two Jack and Bore operations to maintain traffic in SR 161 and multiple utility crossings. The construction management services involved observing the contractor's work for compliance with the contract, interfacing with the public to determine the location for the side sewers, administering the construction contract, and coordinating with the numerous regulatory agencies. Owner's name/ Telephone City of Edgewood 253 952 3299 ' ;Owner's Project Manager/Telephone EncPhillips, 253 952 3299 Contractvalue: $1 189 811 (BHC s fee) 1 ..: •ys,.. .* T '.:� ilB. N f _e'�` -. H 3 7fdr t l� lyv f.. ti 1 Project start.date . Project end date: Estimated December 2011 Construction contract price, $5, 8.15,161;75 wF ;. at time of -award Construction contract price Not yet complete at time of completion Names and title of Firms' project Gary Bourne* — ULID Specialist, Public personnel on the project with a Involvement, Principal -in -Charge; Tony Fisher — description of their project Project Manager; Jordan Zier — Design responsibility: Engineer RECORD OF PAST PERFORMANCE Page 15 a3 11 Dn 4.1 & PROJECT EXAMPLES l-ON ULTANTS Included in 20 pages L_1 ERWOOD Proposal S12-2010 Queensborough Sewer Rehabilitation Project Upper Vasa Creek Storm Damage Repair Project, City of Bellevue, WA Herrera assisted the City of Bellevue with permitting and design for the repair of a series of check dams along upper Vasa Creek that were damaged during major storm events in December of 2007 and created vulnerability for a city sewer line adjacent to the stream channel. Due to grant requirements associated with funding provided by the Federal Emergency Management Agency (FEMA), and a need to complete repairs within permitting windows before the winter of 2008, Herrera expedited the completion of construction plans, contract specifications, and repair costs on a very short schedule. Additional design challenges included limited site access and restrictions to the construction budget. Herrera also assisted with permit documentation by preparing figures for the Joint Aquatic Resource Permit Application (JARPA) submittal and coordinated with the City project manager to provide project details to the local Emergency Management Division to satisfy requirements related to the FEMA funding mechanism. The project was successfully constructed in September of 2008. Owner's name/ Telephone: City of Bellevue, 425.452.5271 Contract value: $49,900. eject start,date` 6/20084 oiect end date: 9/2008 g t; Construction contract price N/A at time of completion: =(Pnme,iSubconsulfant;_orOther)" Names and title of Firms' project Kris Lepine* — Lead Ecologist and Permit personnel on the project with a Coordinator; Ian Mostrenko* — Senior Design description of their project responsibility: Review; Chase Barton — Project Manager; Katheryn Seckel — Permit Assistance RECORD OF PAST PERFORMANCE Page 16 & PROJECT EXAMPLES C0NSULTI"NTS Included in 20 pages Resumes Reed A. Kelly, PE Project Manager Education: MS, Environmental/Ocean Engineering, Oregon State University, 1987 BS, Civil, California State University at Sacramento, 1983 Registration: Professional Civil Engineer, Washington, Oregon, Alaska, and California Associations: Water Environment Federation, American Water Works Association, North American Society of Trenchless Technology Reed Kelly is a senior project manager and principal engineer with over 27 years of diverse experience in planning, permitting, designing, and constructing water, wastewater (municipal and industrial), stormwater, solid waste, and general civil facilities. He has specialized experience with wastewater conveyance systems that includes comprehensive sewer system planning, infiltration/inflow studies, trenchless technologies, as well as the design and construction of collection facilities, pumping systems and often related odor control facilities. He has been involved with wastewater facility planning for dozens of communities both in Washington and California, and has been responsible for, and prepared numerous engineering reports, preliminary engineering feasibility studies, and plans and specifications for collection system improvements (6- to 36-inch sewers), small to large pumping systems (50 gpm to 4,000 . gpm) and odor control facilities and forcemains (<4-inch to 36-inch). In addition to his engineering experience, Reed has provided construction support and management, and management of multi -disciplinary teams of engineers and subconsultants for both sewer and water projects. ® Backyard Sewer Relocation Final Design, City of Fircrest, WA — Project manager for the preparation of plans, specifications and cost estimate for sewering one of the three areas investigated. The improvements generally consisted of 3,500 feet of 8-inch gravity sewer and appurtenances (manholes and laterals) and 6 grinder pump systems. The design was unique in that designs were prepared for the on -site side sewers. The construction cost was approximately $2 million. ® Backyard Sewer Relocation Preliminary Design Report, City of Fircrest, WA — Project manager for the preparation of a preliminary design report that investigated rehabilitation, replacement and relocation of backyard sewers in three different areas within the City. In the three areas over 100 properties were connected to backyard sewers that were failing. Access for inspection, maintenance, and repair was a major problem. Conceptual designs and cost estimates were determined for each area. Trenchless technologies were investigated but were determined not to be feasible due to the presence of compacted and cemented glacial till in all of the areas. Although CIPP could have worked in some situations, its use was limited since access for maintenance was still and issue. In addition, TV inspection could not be performed due to severe root intrusion and other issues. The recommendation involved installing gravity sewers within the streets fronting the properties. Since some of the homes were significantly lower than the sewers, some homes required grinder pumps. Total construction cost for relocating the sewers (including the on -site improvements) for the three different areas was estimated to be $6,000,000. ® Everett Basin Study Technical Memorandum, Alderwood Water and Wastewater District, WA — Project engineer for a preliminary investigation to reroute sewage flows from several basins within the South Everett area. A conceptual design for rerouting and conveying the flows for seven alternatives was developed. The alternatives included CD] : [� CONSULTANTS Reed A. Kelly, PE Page 2 pump stations (capacities of 1,300 to 5,200 gpm), force mains (12-24 inch), and gravity sewers (12-42 inch). From these conceptual designs, planning level project costs were developed for near term and future flows. Allied costs included potential capacity charges. Project costs varied from $10 million to $47 million. ® South Central Force Main Replacements Final Design, Kitsap County, WA — Project engineer for the preparation of specifications for both Schedules 1 and 2, including assistance with various aspects of the design. The project also included the addition of 6,500 feet of 18-inch HDPE reclaimed water transmission main parallel to the 34-inch HDPE sewage force main for the Silverdale Water District (Schedule 2). ® South Central Force Main Replacements Preliminary Design Report, Kitsap County, WA — Project manager for the preparation of a preliminary design report that investigated and evaluated alternatives for replacing 3,300 feet of 12-inch AC sewer force main with 12 or 14-inch force main (Schedule 1) and 6,500 feet of 30-inch Techite sewer force main with 30-inch force main (Schedule 2). Transient analyses were conducted on both projects. HDPE pipe was selected for both projects for its corrosion properties, reduction in transients, and reduced vulnerability to seismic events. Schedule 1 was situated in County roads while Schedule 2 was situated in open pastures, woodlands, and wetlands/streams. Schedule 1 included investigation and evaluation of four alternatives/options: 1) parallel replacement with a 12 or 14-inch force main; 2) replacement with a 12 or 14-inch force main using pipe bursting; 3) abandonment of a lift station with installation of a 15-inch gravity sewer and; 4) extending the sewer force main to a lift station. Project costs for Schedule 1 were estimated at over $4 million. In addition to different pipe materials and use of trenchless technologies, two different alignments were investigated for Schedule 2: 1) parallel replacement and; 2) alternative alignment for a portion. As the force main could not be shut down, hot tapping and line stopping were required at both ends of the project. Project costs were estimated at $12.9 million. ® Sanitary Sewer Expansion — Phase I, City of Lake Forest Park, WA — Project manager for the preparation of plans and specifications for sewering one of several unsewered and topographically challenging areas within the City. A combination of gravity sewer and individual grinder pump systems were designed. The project involved 1,800 feet of 8-inch gravity sewer, 54 grinder pumps and 3,400 feet of 2-inch HDPE force main and appurtenances. ® Trunk Sewer, City of Marysville, Marysville, WA — Project manager for the design of 5,000 feet of 18-inch sewer. Project included environmental field reviews (cultural resources, biological assessment and wetland's delineation) and permitting (SEPA, NPDES, US Army Corps, JARPA). Trenchless techniques were needed to cross two streams along the project's alignment. Due to high groundwater and sandy soils, dewatering was a significant aspect of the project. Easement acquisition was also performed. I"I■1~ CONSULTANTS Craig P. Chambers, PE Principal Engineer Education: MS, Civil Engineering, University of Washington, 1976 BS, Civil Engineering, Oregon State University, 1972 Registration: Professional Engineer, Washington Associations: Water Environment Federation Craig Chambers has more than 30 years of experience in the design, construction, and management of wastewater, stormwater, and water projects for municipalities, counties, and special service districts. Craig has successfully evaluated, designed, and provided construction services more than 60 wastewater projects. This experience includes authoring 15 comprehensive sewer plans, 10 wastewater treatment plants, 22 pump stations and pipelines projects (including vacuum sewers, grinder pumps, and traditional gravity collection systems), and 1/1 reduction projects under the King County program. ® Update to Sewer Comprehensive Plan, Alderwood Water and Wastewater District, WA — Craig was the project manager of the BHC team selected by the District to update its comprehensive sewer plan. Alderwood Water and Wastewater District provides service to a population of more than 200,000, covering an area of approximately 60 square miles. As one of the largest special service districts in the state, the District desired a useable planning tool that would anticipate the needed infrastructure improvements to match growth. To meet this need, the BHC Team, in concert with the District staff, evaluated several hydraulic models, and is in the process of selecting, calibrating, and training District staff to use the model. Working with 13 Cities and Districts that are either served by, or adjacent to the District, population forecasts and resulting flows were projected. Combining this information with the calibrated model, conveyance and treatment facilities were evaluated and, where necessary, slated for improvement as part of the CIP program. ® Beach Sewer Line Rehabilitation, Southwest Suburban Sewer District, Burien, WA — Craig is the project manager responsible for designing improvements to this 50 to 60 year old sewer line installed at the beach at Seward Park. The project includes slip lining the existing main with 4-inch pipe and installing a new 4-inch force main, installing grinder pumps to serve 24 parcels, and constructing a new pumpstation and modifications to an existing station. is Bainbridge Island South Island Sewer System LID #20, City of Bainbridge Island, WA — Project manager for LID formation assistance, design, and construction services for the City of Bainbridge Island's South Island Sewer System. This project provided sanitary sewers to 220 homes in four neighborhoods and an elementary school in an area with 71 documented (DOH) septic system failures. The septic failures impacted a sensitive wetland or flow directly into Puget Sound in the sensitive Blakely Harbor. The Project included providing on -site sewer facilities and related service connections, collection and conveyance piping, pump stations, and connection to the existing sewage treatment plant. There are 220 residential lots or approximately 500 people in the project service area and close coordination with the residents was key to the project's success. Weekly coordination meetings with the School District, home owners associations, and emergency service providers were held to insure that construction activities did not disturb traffic flow. Traffic control plans were reviewed, published, and distributed to all affected agencies. CONSULTANTS Craig P. Chambers, PE Page 2 13 Marians Park Addition Sewer Rehabilitation, Southwest Suburban Sewer District, WA — Project manager for the engineering design and construction assistance for the sewer pipe rehabilitation of the Marians Park Addition. The project consisted of the replacement of 3,000 linear feet of 8-inch diameter sewer main with associated manholes, sewer stubs and surface restoration. Open cut, cured in place pipe (CIPP), and pipe bursting methods were specified for the work. Tasks included: preparation of specifications and contract documents, cost estimation, and construction services. The project included coordination with King County Real Estate Services Section for traffic control plans and right-of-way permits. ® Interceptor/Collectors, Several Locations, City of Auburn, WA —Project manager for interceptor sewers, as follows: LID 310: 2500 feet of 30- to 42-inch interceptor; 170 feet of 8-to 12-inch collectors; 2 crossings of Mill Creek. LID 314: 300 feet of 30- to 36-inch; 1300 feet of 18-inch; 2900 feet of 12-inch; 2 crossings of Mill. Creek; 1 jacked highway crossing of SRI 8. LID 318: 3350 feet of 21-inch interceptor; 250 feet of 10-to 18-inch pipe; 2 jacked railroad crossings; pump station abandonment. LID 330: 1270 feet of 12-inch; 1 jacked crossing of SR 167. Pay 'N Save: 1450 feet of 12-inch; 1 jacked railroad crossing; 1 jacked crossing of SR 167 Extension ® King County 1/1 Project, King County, WA — Served as a Local Area Manager for the $30 million Regional 1/1 Reduction Program. LAM responsibilities included: • Liaison with several north sewering agencies in northern King and southern Snohomish Counties. • Selection of pilot projects to investigate the effectiveness of various 1/1 removal techniques • Provided QA/QC control for all 1/1 design documents • Workshop involvement throughout the five year course of the work ® Monroe East Side Interceptor — Monroe's growth and North Hill developments were destined to overload the City's main pump station. Nearly 60% of the City wastewater flow currently is directed through this single station. The added anticipated flow would be more than the station could accommodate and expansion of the station was infeasible. Prompted by the need to redirect sewage flow away from the main pump station and motivated to accommodate the new developments the City elected to combine several improvement projects under a single design and construction effort. The Eastside Interceptor included the following elements: 5200 LF of 24-inch sewer interceptor; 40-inch borings under SR2 and an active railroad line; 3800 If of water main replacement; rechannelization of Main Street and cross streets; elimination of all overhead electrical and telephone lines; and new street lighting This project was complicated by the fact that the sewer interceptor ran through the heart of old downtown Monroe. The temporary inconvenience of construction disruption eventually resulted in a revitalized downtown core. ®111 CONSULTANTS Larry Amans, PE Project Engineer Education: BS, Civil Engineering, Oregon State University, 1970 Registrations: Professional Civil Engineer, Washington, California Larry Amans has over 35 years of experience in planning, design, preparation of plans and specifications, and construction management for a wide variety of civil engineering projects, concentrating mainly on utility designs for sewage, water, and drainage systems. ® CSO Reduction Project, City of Snohomish, WA — Project manager for design of a two-part pump station and pipelines to separate sewage from stormwater, thus stopping combined sewer overflows (CSO's) to the Snohomish River. The pump station consists of two suction lift pump sets, one at 6,500 gpm (sewer), and one at 5,400 gpm (storm). Sewer and storm piping to convey both flow streams to the City's treatment plant included 2,100 feet of sanitary sewer force main, 3,000 feet of storm drain, and 50 new manholes. Permits obtained included a Corps Nationwide Permit (wetlands), Shoreline Permit, Biological Evaluation (endangered species), JARPA, SEPA Checklist, and WSDOT approval of Channelization Plan and Franchise Agreements (pipes and roadwork within WSDOT right-of-way.) ® 1&I Reduction Program, City of Sultan, WA — Engineer for the design of a two-phase program to reduce I&I in the City's downtown sewer system. Phase I included lining and repairs on fourteen leaking manholes, and re-routing several storm drain lines connected to the system. Phase II replaced 2,900 linear feet of leaking 8-inch sewer pipe with new 18-inch sewer pipe, and reconnecting 38 existing side sewers along 1st Street. The pipeline was up -sized to provide for future extensions. ® 1st Street Sewer Improvements, City of Sultan, WA — Project Manager for the design of 7,000 feet of 12-inch storm drain, 18-inch sewer, and 8- and 12-inch water lines in Sultan, WA. All pipes are in existing City streets and replace aging or undersized infrastructure. Pipes had to be positioned to maintain existing pipes in service, and to provide minimum water and sewer pipe separation distances State Route (SR) 20 Sewer Relocation, State Parks, Deception Pass State Park, WA — Project manager for the design of 2,000 feet of 6-inch sewer force main along SR 20 near Deception Pass. WSDOT planned to lower the highway by up to 10 feet in this area, which necessitated the relocation of Parks' sewer line. Staged construction was specified to mesh with the concurrent highway construction and keep sewer downtime to an absolute minimum. To maintain continuous sewer service to the park, we worked closely with Parks' staff to develop a program for providing 36 portable toilets at 11 comfort stations during a one-time nighttime shutdown of the force main to connect the new pipeline to the old. ® Wastewater Conceptual Engineering Study for Lower Elwha Klallam Tribe, Port Angeles, WA — Designer and author of a preliminary design study for a new sewage collection and disposal system to serve 370 homes at buildout, with new grinder pumps. Disposal alternatives studied included an onsite treatment plant, onsite drainfield, and a lift station with a 2-mile-long force main. Services of special value to the Tribe included: quick turnaround time in responding to requests by staff; explaining the details of different technologies at community meetings and in conversations with staff; and developing a detailed cost model of monthly homeowner charges for 100, 150, 200, and 370 homes. ■ [~ CONSULTANTS Gary Bourne, PE Easement Acquisition/Community Outreach Education: Civil Engineering, Arctic Engineering, University of Washington Registration: Professional Civil Engineer, Washington, Alaska Professional Land Surveyor, Washington Award: Engineer of the Year, ACEC Washington, 2007 Gary Bourne has over 35 years of experience in the design, management, and administration of public works facilities. He is also skilled in grant writing, leading public involvement efforts, making presentations to councils and boards, and assisting clients with funding allocations and permitting. Gary's broad knowledge and experience allows him to work with municipal clients as a senior engineer, representing their interests and guiding their development. He has distinguished himself among colleagues and clients alike for his attention to technical excellence and client service. The long-standing professional relationships that he has developed throughout his career are evidence of his ability to consistently deliver projects that are successful and meet client expectations. ® South Island Sewer System LID, Bainbridge Island, WA — Lead LID formation and public involvement process to this project that provided sanitary sewers to 220 homes in four neighborhoods and to an elementary school in an area with 71 documented (DOH) septic system failures. The Project included providing on -site sewer facilities and related service connections, collection and conveyance piping, pump stations, and connection to the existing sewage treatment plant. Public involvement included weekly coordination meetings with the School District, home owners association, and emergency service providers. ® Sanitary Sewer System Expansion, Phase II & III, City of Lake Forest Park, WA — Project manager responsible for preliminary engineering, final design, community outreach, and construction administration for installation of 13,000 LF grinder pump force mains and 5,600 LF of gravity lines required to serve previously unserviced areas. Resolution of service details for each property required the design team to work closely with the property owners and develop unique design details to couple the new grinder pump system with new and old gravity collection systems. ® Meridian Avenue Sewer Improvements, City of Edgewood, WA — This project consists of the design to install three pump stations, approximately 14,000 linear feet of sanitary sewer force main and 15,000 feet of gravity sewer main. Included in the scope of work is a preliminary design effort to review probable construction costs and the LID boundary; prepare construction documents for gravity sewer, sewage pump stations, and forcemains; prepare permit and environmental documentation; assist the City in the formulation of a local improvement district (LID); assist in property acquisition negotiations and preparation of the conveyance documents, survey, and geotechnical support; and probable cost estimating. CONSULTANTS David C. Harms, PE Hydrologic/Hydraulic Modeling Education: BS, Civil Engineering, University of Washington, 1982 Registration: Professional Engineer, WA, 1992, 28532 Associations: American Water Works Association, Washington Hydrologic Society Dave has over 26 years of experience in wastewater, stormwater, and water projects, including comprehensive planning and design studies for wastewater collection systems, stormwater conveyance and control facilities, and water distribution systems. His professional engineering experience is primarily in drainage basin and utility systems modeling and design studies using state of the art hydrologic and hydraulic computer models to analyze a wide range of scenarios. Dave has extensive experience using HSPF, MIKE Urban (MOUSE), SWMM, WWHM3, MGSFIood, KCRTS, StormShed, HEC-RAS, HYDRA, INFOWater, WaterCAD, H2ONET, EPAnet, HAMMER and SURGE5 modeling software. ® Stormwater System Improvements, City of Bothell, WA — Dave oversaw the hydrologic/hydraulic analyses for four areas experiencing localized flooding within the City. He defined the modeling approach; generating subbasin hydrology using WWHM3PRO and extracting resultant hydrographs for input to XPSWMM models of local conveyance systems. Dave provided Q/C for the analyses, which identified conveyance inmprovements to resolve the localized flooding. ® Stormwater System Plan, City of Monroe, WA — Dave was project manager for this project, responsible for overall coordination with subconsultants and the City. Dave oversaw the hydrologic/hydraulic analysis for three study areas within the City. Each study area experiences localized drainage problems and the analysis identified alternative solutions using infiltration and/or improved conveyance. Dave coordinated the subconsultant regulatory analysis effort addressing NPDES II requirements and their update of O & M practices. He also lead the development of an updated CIP, as well as overall document preparation. ® Sea-Tac International Airport Natural Resource Mitigation/Master Plan Update, Seattle, WA — Dave performed hydrologic analyses for the Port of Seattle 3rd runway Stormwater Management Plan, using the HSPF computer model. Dave updated/calibrated the Des Moines Creek model and determined detention facility requirements for multiple scenarios. He assisted with recalibration of the Miller Creek mode and determined detention requirements for airport facilities discharging to Miller Creek. Dave utilized the KCRTS model to determine preliminary detention volume and control structure requirements. Detention facility requirements were then verified in HSPF by performing statistical analyses of long term simulations. Impacts of Airport development on creek base flows were also analyzed. ® Hydrologic Analysis, Snoqualmie Ridge Development, WA.— Dave performed a comprehensive hydrologic analysis for a large scale residential Master Drainage Plan. He developed and calibrated the HSPF computer model to streamflow for two independent drainage basins. Dave was responsible for management of flow monitoring data used for model calibration and for development of baseline hydrologic response. Model calibration consisted of annual and seasonal volumes, together with characteristics of individual storm events. Calibration parameters were applied to additional drainage basins within the project area, based on corresponding soil, slope and ground cover types. Existing conditions model simulations were performed for all CONSULTANTS David C. Harms, PE Page 2 basins, using the entire 40-year precipitation record. Statistical analyses were performed on model output to determine baseline peak recurrence interval flows and flow duration curves. Model calibration parameters were modified to simulate developed conditions, using USGS regional calibration parameters as an initial basis for the change from forested to grass ground cover. Stormwater detention and conveyance facility requirements were initially determined independently from HSPF, then input to the HSPF model and verified by performing statistical analyses on long term simulations. Resulting peak recurrence interval flows and flow duration curves were compared to baseline data to verify facility performance. Requirements for flow diversion to direct discharge pipelines were determined using HSPF. The combined routing from developed conditions detention, conveyance and diversion to direct discharge was then analyzed in HSPF for each drainage basin. A separate hydraulic analysis was performed on the direct discharge pipeline to verify adequate capacity. ® Comprehensive Stormwater Management, City of Kirkland, WA — Dave developed HSPF models for Juanita and Forbes Creeks. GIS based land use from the City was categorized and formatted for input to the HSPF input files. He coordinated field investigations to define stream channel characteristics for model input; developed future conditions model scenarios by incorporating projected increases in impervious acreages for each subbasin; and utilized the models to analyze future increases in stream flows and determine regional versus on -site detention volume requirements necessary to hold flow durations to current development levels and also to retrofit to a predeveloped condition. His analysis included investigation into synergistic impacts of regional versus on -site detention, on a watershed scale. Dave prepared a summary report identifying hydrologic, financial, O & M and other advantages and disadvantages of regional versus on -site detention practices, recommending a policy for the City to adopt. ® Stormwater Outfall Study, City of Oak Harbor, WA — Dave oversaw the hydraulic analysis of alternatives for the replacement of the City's existing 42-inch diameter Dry Creek Basin western stormwater outfall into the harbor. XPSWMM modeling software was used to analyze the effectiveness of the alternative solutions in lowering the hydraulic gradient at an up stream intersection experiencing recurring flooding. ® Dayton Avenue NE and NE 22nd Street Drainage Improvements Project, City of Renton, WA — Dave performed a hydrologic/hydraulic analysis using XPSWMM software, to identify improvements to the City's existing stormwater conveyance system that would mitigate existing drainage problems in the project vicinity. System improvements included collection and conveyance piping, catch basins, related system appurtenances, and existing facility adjustments and/or connections. ® SR 520 West Lake Sammamish Parkway, Redmond, WA — Dave assisted with conceptual drainage configuration for the Phase 3 widening of SR 520, from the interchange with West Lake Sammamish Parkway, to the interchange with SR 202. The phase 3 widening project involves Bear Creek Buffer and FEMA floodway issues, as well as changes in stormwater management requirements based on regulatory, project, and physical changes in the project vicinity. Dave assisted with stormwater detention and water quality requirements, working with challenges including flat topography and limited available space. Prime consultant: CH2M Hill, Inc. M 3101~, CONSULTANTS Greg Waddell Planner — Permitting Support Education: BA, Urban & Regional Planning, Western Washington University, 1969 Greg Waddell has over 30 years of planning experience including master planning, urban design, and environmental studies. Greg was Director of Planning and Community Development for the City of Bellingham for eight years and was SEPA Responsible Official for all City sponsored projects and private development proposals. He has been project manager and contributing author of numerous Environmental Impact Statements and has provided permitting assistance on BHC water and wastewater engineering projects. His experience includes: 19 SE Transmission Main (Bear Creek), City of Redmond, WA Is South Central Sewer Forcemain Replacement, Kitsap County, WA ® Combined Sewer Overflow Facilities, City of Snohomish, WA ® Shoreline Master Plan Compliance Analysis, City of Everett, WA ® NEPA Environmental Report, Hartstene Pointe Sewer & Water District, WA ® Water Tanks #4 Safety & Seismic Improvements, Covington Water District, WA ® South Central Conveyance Sewer System Replacement, Kitsap County, WA ® The Bellingham Plan, City of Bellingham, WA ® Snoqualmie Pass Design & Development Plan, Snoqualmie Pass, WA ® Development Code Update, City of Auburn, WA ® Freeland Sub -Area Plan, Island County WA IN Downtown Plan, City of Kelso, WA ® Growth Management Planning Services, City of Leavenworth, WA ® Development Code Update, City of Orting, WA ® Design Guideline Visioning, City of Milton WA South County Subarea Plan, Lewis County, WA CONSULTANTS John Hatch Design/Construction Review & Schedule Education: Continuing education classes, University of Washington Continuing education classes, Bellevue College OSHA 10 Hour Construction Training Course John Hatch has over 40 years of experience in design, construction management, and inspection of numerous water and wastewater facilities for both public and private clients. John has been the Construction Manager on many multi -million dollar projects, with six to eight of those projects between five and eight million dollars in construction cost. His construction management experience includes site development, utilities, all types of structures for treatment, storage, and complex pumping facilities, related equipment and system installations, electrical and control systems, and facility commissioning. Skills and Accomplishments • Lead presenter for CEU-qualified worships in utility construction management and inspection given in Federal Way, Edmonds, and Spokane • Created Construction Services Management and Inspection Manual for utility projects • Completed numerous on-line company traning programs in ethics, diversity, project management, and office and construction safety. ® Senior Project Manager/Construction Services Manager • Onsite inspection and construction engineer support for upgrade of an industrial wastewater treatment facility in eastern Washington • Assisted with design of modifications to the digester system of a wastewater treatment facility in western Washington • Performed constructability reviews of infrastructure on light rail facilities for Sound Transit. • Assisted with design and provided construction management support for water and wastewater improvements to Safety Rest Area facilities for WSDOT • Project management, design and design assistance for over one hundred water and wastewater facilities ranging from utilities to pump stations to reservoirs to treatment plans in Washington. • Provided construction services management and inspection for twenty plus potable water, and municipal and industrial wastewater facilities with construction costs ranging from $100,000 to over $6 million in Washington. • Assisted with development of facilities plans and technical reports for water and wastewater facilities in western Washington. ® Project Manager/Construction Services Manager • Performed project management, design, and design assistance for more than fifty wastewater and water treatment plans, pump stations and utilities in Washington. • Construction services manager and inspector for over fifteen water and wastewater facilities with project costs exceeding $200,000 in Washington. GQNSULTANTS John Hatch Page 2 ® Senior Design Technician • Design assistance for several water and wastewater facilities in Washington • Provided construction management and inspection for utilities, reservoirs, pump stations, and treatment plans in Washington. • Supervised drafting group. 13 Design Technician • Assisted with design and drafting of a number public works projects in Washington, Oregon, and Saudi Arabia. • Inspected water and wastewater facilities in western Washington. ® Drafter • Lead drafter for projects ranging from water and sewer utilities to an industrial fire pump station. CONSULTANTS Christopher J. Brummer, PhD, PE, LEG Senior Engineer/Geomorpho(ogist Chris Brummer is a professional engineer and licensed engineering geologist with 19 years of both applied and research experience in the fields of geology and engineering geology. Dr. Brummer brings an interdisciplinary approach to the solution of complex environmental problems by drawing on his diverse background in fluvial geomorphology, geotechnical analysis, engineering design, and permitting. Dr. Brummer specializes in debris -flow hazards in alluvial -fan environments, sediment supply and transport in mountain and lowland channels, the stability and transport of woody debris, the influence of woody debris on sediment aggradation and channel migration zone delineation, scour analysis, and channel rehabilitation and bank protection using bioengineering methods. Dr. Brummer has applied these tools to perform reach -scale river and floodplain assessments and develop design alternatives for bank stabilization, levee setback, infrastructure protection, and habitat restoration. He has performed numerous slope stability and seismic analyses of bedrock slopes, engineered soil embankments, and geosynthetic-lined slopes. His engineering experience also includes the preparation of construction plans and specifications for river and floodplain projects. Key Project Experience Erosion and Bank Stability Assessment for Private Property near Jim Creek, Snohomish County, WA Herrera assessed the erosion and bank stability for a private tax parcel located adjacent to Jim Creek, a tributary to the South Fork Stillaguamish River in Snohomish County, Washington. The erosion and bank stability assessment was conducted to support an application for a Shoreline Variance Permit with the Washington State Department of Ecology. Herrera conducted a site visit to assess existing erosion and slope stability, and completed a report summarizing the field investigation and assessment of the existing erosion and bank stability. Dr. Brummer provided assisted in preparation and review of the final report, which included channel cross-section data, a geomorphic base map, and a summary of findings. Herrera concluded that the property may be at risk from erosion due to unstable banks both at and adjacent to the property. City of Bothell Surface Water and Drainage Master Plan Snohomish County, WA Herrera assisted the City of Bothell with engineering and geomorphic assessments of two sites proposed for capital improvement projects under the Surface Water and Drainage Master Plan. Dr. Brummer conducted a one -day field reconnaissance of the Queensborough tributary to North Creek to determine the source of excess fine sediment deposition and turbidity between 4th Avenue SE and I-405 in Bothell. Herrera staff also performed a field reconnaissance of Perry Creek to evaluate the performance of several stormwater detention ponds. Dr. Brummer assisted with the development of several conceptual solutions for channel stabilization and erosion control and the development of preliminary cost estimates for each measure. Recommendations were incorporated into the City's Master Plan Update. Lower Boise Creek Channel Relocation, King County, WA The King County Water and Land Resources Division proposes to relocate the lowermost 500 feet of Boise Creek into a newly constructed stream channel. The purpose of the project was to improve fish and wildlife habitat in lower Boise Creek Herrera Environmental Consultants, Inc. www.herrerainc.com Chris Brummer, PhD, PE, LEG, page 2 and the floodplain of the White River by restoring habitat -forming riverine processes on property owned by King County. The newly constructed channel and floodplain areas will provide spawning, rearing, and refuge habitat for juvenile salmonids including Chinook, pink, coho, and chum salmon, as well as resident and sea - run cutthroat trout, and rainbow/steelhead trout. Dr. Brummer is the project manager for this work order, which rapidly developed a 100% plan set suitable for use in construction by King County crews during summer 2009 and 2010. Dr. Brummer performed a shear stress and incipient motion analysis to properly size the channel width, depth, and slope and the proper spacing of large woody debris structures providing hydraulic roughness. Dr. Brummer also conducted a compensatory storage analysis to evaluate flood impacts on the proposed grading plan and authored the basis of design report. Upper Puyallup River Bank Stabilization and Road Repair Pierce County, WA The Puyallup Tribe of Indians operates and maintains a fish ladder at the Electron Dam near river mile 41.5 of the Puyallup River. The fish ladder was installed in 2000 to restore fish passage to 30 miles of riverine habitat and constructed rearing ponds for Chinook and coho salmon. Peak flows in November 2009 destroyed a bridge and caused channel migration into the only other access road to the Tribe's facility. Herrera's project manager, Chris Brummer, worked with Hancock Timber Resources, the property owner of the road, to provide design services for bank repair and reconstruction of the access road. Dr. Brummer conducted a geomorphic assessment, completed an inventory of floodplain wood for use in bank reconstruction, assisted in the developed a hydraulic model of the project reach and two nearby problem sites, and supervised the design of 250 lineal feet of a log crib -wall for reconstruction of the bank and roadway. Herrera received the notice to proceed in July 2009 and completed the geomorphic assessment, permit application, and final construction drawings within two months. Herrera also provided on -site construction oversight. The project was successfully completed under budget in fall 2009 and restored access to the Tribe's fish ladder, which had been inaccessible for three years. Mashel River Restoration for South Puget Sound Salmon Enhancement Group and Nisqually Indian Tribe, Eatonville, WA Herrera is assisting the South Puget Sound Salmon Enhancement Group (SPSSEG) and the Nisqually Indian Tribe (NIT) with the feasibility analysis, hydraulic modeling, and engineering design of four restoration phases in the Mashel River located in Eatonville, Washington. The first phase was completed in 2007 and involved the design and construction of 14 engineered logjams (ELJs) in three river reaches of the Mashel River in order to reconnect floodplain areas and enhance instream salmonid habitat. Dr. Brummer was the project manager for the second and third phases of restoration involving the design and construction of 22 more ELJs in two river reaches in 2009 and 2010. Preliminary designs for the fourth phase include the design and construction of 12 ELJs near at confluence with the Little Mashel River. Herrera is using both conventional one-dimensional hydraulic modeling (HEC-RAS) and more sophisticated two-dimensional (FLO-2D) modeling to evaluate alternative restoration options that will maintain or reduce existing flooding and erosion risks to surrounding property while also expediting the restoration of riparian and aquatic habitat to these ecologically degraded reaches of the Mashel River. Considerable design challenges in the three reaches include sedimentation from an active landslide and eroding banks, water and sediment inputs from a major tributary, artificial bank hardening, an exposed log crib wall retaining an abandoned mill pond, and potential flooding of adjacent private properties. In addition to project management duties, Dr. Brummer performed geomorphic assessments, developed concept designs, and assisted with construction oversight for various project phases. WSDOT SR 542 Alternatives Analysis: Glacier and Gallop Creek at confluence of North Fork Nooksack River, Whatcom County, WA Dr. Brummer developed sediment rating curves for Glacier and Gallop creeks in support of detailed 2D hydraulic and sediment transport modeling of flooding and debris flow risks to the town of Glacier and the SR 542 Glacier and Gallop Creek bridges. Herrera Environmental Consultants, Inc. www.herrerainc.com Ian B. Mostrenko, PE Hydrologic Analysis Ian Mostrenko is a senior civil engineer with 17 years experience in civil and environmental engineering projects including stormwater design, surface and ground water quality, stream restoration, and general civil site development design. His area of expertise is in stormwater quality, conveyance and detention. As a professional engineer, he has performed design and construction management for a wide variety of stormwater related civil engineering projects involving grading; drainage; stormwater conveyance, treatment, and detention; stream restoration; and stormwater issues related to Municipal Solid Waste landfills. For river and stream restoration related projects, Mr. Mostrenko has conducted construction management and prepared the design plans, specifications, and cost estimates for several projects involving rivers, streams, and wetland areas. In collaboration with biologists at Herrera, Mr. Mostrenko has designed streambed controls and habitat structures such as log weirs, rootwads, boulder bed -control structures, deflector logs and bank protection structures for erosion control. Key Project Experience City of Bellevue Coal Creek Parkway Culvert Replacement Bellevue, WA Mr. Mostrenko developed a hydraulic model to evaluate the hydraulic performance of the existing 96-inch culvert that conveys Coal Creek beneath Coal Creek Parkway. The hydraulic analysis included a concrete box flow control structure just upstream of the culvert to define the extent of backwater and flow attenuation provided by both structures. The existing culvert is undersized, structurally failing, and is located near substantial infrastructure such as a natural gas pipeline, sewer force, power transmission lines, and two Williams pipeline trunk lines. Mr. Mostrenko used the hydraulic model to simulate new culvert sizes and orientations to assess fish passage and to compare the backwater and flow attenuation with and without the concrete flow control box. He also used the model to provide recommendations for log grade control and instream habitat structures and to assist the City of Bellevue with the environmental permitting application process. City of Kent Downey Farmstead Restoration Project Unincorporated King County, WA Herrera is assisting the City of Kent with feasibility analysis and preliminary design of a habitat restoration and floodplain improvement project on 20 acres of uplands adjacent to the Green River in unincorporated King County. The restoration site is bounded by Frager Road, State Route 516, and Mullen Slough. Frager Road parallels the river bank at this site and confines the river channel. Mr. Mostrenko is part of Herrera's multidisciplinary team of engineers and scientists that is evaluating restoration alternatives to maximize salmonid rearing habitat in a new side channel or backwater slough while accounting for effects on existing wetlands, flooding and flood storage, sediment transport, recreational uses, pedestrian and vehicle traffic movement, historical and cultural resources, seismic stability of the State Route 516 embankment, and environmental permitting considerations. Mr. Mostrenko is responsible for the hydraulic modeling, concept design development, and evaluating the hydraulic and geomorphic response and performance of the proposed designs with respect to the design goals and objectives to improve salmonid rearing habitat. Herrera Environmental Consultants, Inc. www.herrerainc.com Ian B. Mostrenko, PE, page 2 Hansen Creek Alluvial Fan and Adjacent Wetlands Restoration Sedro-Woolley, Skagit County, WA Mr. Mostrenko is the lead design engineer and project manager for the restoration of the Hansen Creek lower alluvial fan for the Upper Skagit Indian Tribe. Key elements of the design include 1) levee removal, 2) the placement of instream large woody debris structures to control bedload movement and passively engage the floodplain over time as vegetation establishes, 3) the creation of a channel network in the fan and wetland areas to jumpstart the initial availability of off -channel habitat, 4) conversion of disconnected depressional wetlands to a large flow -through riverine wetland, and 5) the placement of large woody debris in the floodplain to increase and enhance salmonid rearing and overall floodplain health. Mr. Mostrenko developed a hydraulic model using FLO-2D to complete a two-dimensional hydraulic analysis comparing flood depths, inundation areas, and floodplain velocities under existing and proposed conditions. The hydraulic model provided a basis for the concept design as well as an understanding of the processes that influence salmonid habitat formation and natural channel maintenance. Mr. Mostrenko led preparation of the final design plans and specifications for construction, and provided oversight during construction in the summer of 2009. Preliminary Stormwater Management Systems Analysis for the 1-5 and 196th Street Southwest Interchange Project, Phase C Lynnwood, Snohomish County, WA Mr. Mostrenko was the design engineer responsible for analysis and preliminary design of the drainage systems for the widening and interchange expansion project along a 2-mile length of I-5 in Lynnwood, Washington. The large commercialized drainage basin with multiple subbasins resulted in a challenging design given the large stormwater volumes, limited space, nearby streams, and numerous high quality wetlands adjacent to the highway. The project drainage analysis and design included two options: modification of existing drainage structures and maxi.-nizing existing space in the highway right-of-way for ponds and treatment facilities, and a complete retrofit option including adjacent land acquisition to satisfy current Washington Department of Ecology standards. Mr. Mostrenko reviewed previous drainage studies and related design analyses of existing stormwater treatment and detention facilities, reviewed available information on streams, wetlands, ground water, and soils in the project area, performed field reconnaissance, analyzed the treatment and flow control facilities using MGSFlood, and prepared a preliminary design report so that the Washington State Department of Transportation can assess the strategy for drainage planning on the project. Alternatives Analysis and Preliminary Design of Construction Water Treatment System for Skagit Gorge Dam Tunneling Whatcom County, WA Mr. Mostrenko provided engineering services to Seattle City Light to assess treatment options to manage discharge water from a tunnel boring machine (TBM) used to construct a new companion tunnel to improve power generation efficiency and output of the Skagit River Gorge Powerhouse. The TBM generates silt - laden discharge water with varying discharge rates depending on localized geologic characteristics such as fissures or changes in rock composition. The construction site is located in a confined gorge of the Skagit River so the TBM operation and construction support activities will occur in a very tight work area. Herrera developed several options to treat and discharge the water generated from the TBM operation assuming limited available space and the potential for significant variability in flows rates and suspended solid concentrations. The treatment options included onsite treatment train with a chitosan enhanced filtration system and offsite treatment using long distance pumping with infiltration ponds or land dispersion techniques depending on pumping distances and suitable locations. Herrera conducted an alternative analysis on the options to assess treatment efficiencies, complexity, flexibility to handle variable flow rates and concentrations, maintenance, and monitoring requirements. Herrera compared the performance rating of each option and compared that to the capital costs and maintenance/monitoring costs to assess the preferred alternative for the most effective treatment option. Herrera Environmental Consultants, Inc. www.herrerainc.com Julie H.N. Hampden Associate Environmental Scientist /Policy Analyst ,Julie Hampden is a senior environmental scientist and policy analyst with 14 years of experience in fisheries, wildlife, natural resource management, education, and policy analysis. She has worked with local agencies in preparing environmental procedures manuals to ensure compliance with existing regulations. Ms. Hampden has developed course materials and conferences on environmental regulations and technical issues, and has instructed WSDOT courses addressing the Endangered Species Act and its requirements for the last 8 years. She coordinated the development of eight Aquatic Habitat Guidelines white papers addressing aquatic habitat preservation and restoration for the Corps of Engineers and Washington state departments of Ecology, Fish and Wildlife, and Transportation. For 9 years, Ms. Hampden has served as an in-house consultant biologist for WSDOT, preparing and reviewing programmatic and project specific biological assessments (BAs) for the agency, developing policy and educational materials, and conducting ESA section (7) consultations at the U.S. Fish and Wildlife Service reviewing BAs as a liaison for WSDOT. She has extensive field experience involving salmonid sampling, stream survey/riparian habitat research and classification, assessment of fish population distributions and presence in freshwater systems, spotted owl surveys, marbled murrelet surveys, and carnivore tracking surveys. Most recently, Ms Hampden helped WSDOT, FHWA, NMFS and USFWS develop a model and procedures for evaluating stormwater impacts to ESA -listed aquatic species. Key Project Experience Carlsborg Urban Growth Area Sewer Facilities Biological Assessment Carlsborg, WA Clallam County and Public Utility District No. 1 of Clallam County (PUD) plan to jointly develop a sewer system for the Carlsborg Urban Growth Area (UGA), with the PUD becoming the system owner and operator. The County and PUD contracted BHC Consultants to develop a Sewer Feasibility Study (2007) and a Sewer Facilities Plan (2009) for Carlsborg UGA. In November 2009, Herrera was contracted by BHC to assist the County and PUD in developing a biological assessment for Endangered Species Act (ESA) Section 7 consultation with USFWS and NOAA Fisheries. Ms. Hampden was the project manager, lead project biologist, and primary author of the biological assessment. City of Kent Downey Farmstead Restoration Project Unincorporated King County, WA Herrera is assisting the City of Kent with feasibility analysis and preliminary design of a habitat restoration and floodplain improvement project on 20 acres of uplands adjacent to the Green River in unincorporated King County. The restoration site is bounded by Frager Road, State Route 16, and Mullen Slough. Frager Road parallels the river bank at this site and confines the river channel. Herrera's interdisciplinary team of engineers and scientists is evaluating restoration alternatives to maximize salmonid rearing habitat in a new side channel or backwater slough while accounting for effects on existing wetlands, flooding and flood storage, sediment transport, recreational uses, pedestrian and vehicle traffic movement, historical and cultural resources, seismic stability of the State Route 16 embankment, and environmental permitting considerations. Ms. Hampden is providing technical review of the permitting and environmental documentation deliverables for the project. Herrera Environmental Consultants, Inc. www.herrerainc.com Julie H.N. Hampden, page 2 City of Federal Way: Joe's Creek Stream Modification Federal Way, WA Ms. Hampden assisted the City of Federal Way in preparing required permit applications and securing approval from state and county agencies. Permits includes critical areas review, Endangered Species Act Review, Section 404, Section 401 certification, SEPA review, clearing and grading review, and Hydraulic Project Approval. Welcome Lake Dam Safety Improvements Project Woodinville, WA Ms. Hampden assisted the Lake of the Woods homeowners association in preparing all required permit applications and securing approval from state and county agencies. Permits include critical areas review, dam safety review, SEPA review, clearing and grading review, and Hydraulic Project Approval. Endangered Species Act Lead for WSDOT's Tacoma High Occupancy Vehicle Lane, General Engineering Contract Tacoma, WA Ms Hampden is serving as the Endangered Species Act lead for WSDOT's Tacoma HOV lane program. This program consists of nine projects, to be completed by 2015 that will enhance the "people -carrying" capacity of urban highways throughout the Central Puget Sound area. Ms. Hampden is writing multiple biological assessments and coordinating with federal, state, and tribal resource agencies to ensure ESA compliance for the program, and to address the timing constraints and natural resource issues associated with these projects. Programmatic Biological Assessment Evaluating the Environmental Impacts of Washington State Shoreline Guidelines for NOAA Office of Coastal Resource Management Washington Ms. Hampden was the principal author and project manager for the preparation of a programmatic biological assessment for NOAA's Office of Ocean and Coastal Resource Management. The programmatic biological assessment evaluated the potential impacts to listed species and their habitats associated with the new shoreline guidelines for Washington State. The geographic scale of the assessment was extensive and included all the coastal counties of Washington State. Ms. Hampden coordinated and helped to oversee the formal section (7) consultation process with NOAA Fisheries and USFWS. Federal Lands Highways Divisions' Program Development and Design Manual Chapter 3 Update Ms. Hampden served as project manager and one of the primary authors for a revision of the Environmental Procedures chapter of the Federal Lands Highways Divisions' Program Development and Design Manual. The revised chapter is comprised of the following sections: introduction; laws, regulations, policies and guidance; coordination with other agencies; environmental procedures; environmental compliance; and environmental documentation requirements. The chapter was rewritten to ensure it's usefulness to all three divisions of the Federal Lands Highways program of FHWA and to ensure that it more accurately reflects current environmental standards, procedures, and best practices. City of Seattle Department of Transportation Environmental Procedures Manual Seattle, WA Ms. Hampden assisted the City of Seattle Department of Transportation (SDO-f) in developing an environmental procedures manual to replace an outdated manual. The manual was intended help the Capital Improvement Project and Environmental divisions of the agency document their policies and procedures, as well as to provide agency project managers with the procedures, contacts, and resources needed to ensure environmental compliance. Herrera Environmental Consultants, Inc. www.herrerainc.com Kris Lepine, PWS Associate Ecologist Kris Lepine has 12 years of professional experience in wetland assessment, wildlife biology, fisheries biology, restoration and mitigation, wetland mitigation banking, environmental permitting, construction management, monitoring, water quality analysis, and environmental chemistry. He performs a variety of environmental studies for private and public development projects, which include wetland delineations, wildlife and habitat assessments, stream surveys, and mitigation plans. Mr. Lepine has completed several National and State Environmental Policy Act (NEPA and SEPA) studies such as checklists, environmental assessments, and environmental impact statements involving thorough analysis of project alternatives. He performs biological assessments and evaluations in support of Endangered Species Act (ESA) compliance for a variety of fish and wildlife species, which address project impacts, assess environmental baselines, and provide best management practices and minimization measures. In addition, he coordinates a wide range of local, state, and federal environmental permits and approvals on projects including Clean Water Act (CWA) section 404 permits, CWA section 401 water quality certifications, Hydraulic Project Approvals, storm water permits, tribal approvals, shoreline permits, and consistency with local critical areas ordinances. He has extensive experience with preparing various permit applications (e.g., joint Aquatic Resource Permit Applications) and compiling necessary supporting documentation. Key Project Experience Hall Creek Culvert Removal and Ballinger Lake Golf Course Sewer Replacement Mountlake Terrace, WA Mr. Lepine is the lead ecologist and permit coordinator responsible for environmental permitting and mitigation on a City of Mountlake Terrace Public Works project that involves removing a culvert and provide stream channel and bank restoration along Hall Creek. The project also involves replacing a sewer line that crosses underneath the stream. Mr. Lepine is responsible for conducting wetland delineations and stream surveys; preparing a critical areas study; contributing to design including revegetation and mitigation measures; and coordinating all permits on the project. He is also responsible for Endangered Species Act compliance on the project. Permits are necessary from the U.S. Army Corps of Engineers, Washington State Department of Ecology, and Washington Department of Fish and Wildlife. 136th/Redmond Way Stormwater Bypass and Bank Stabilization Redmond, WA Mr. Lepine served as Herrera project manager and lead biologist responsible for environmental assessment, mitigation, and permitting for a City of Redmond Public Works project that involved stabilizing a severely eroded gully on a steep slope by relocating a stormwater outfall and reconstructing a segment of a tributary to Willows Creek. In support of permitting, he produced a variety of reports including a Wetland Delineation and Functional Assessment; Wildlife Study and Habitat Survey, Stream Reconnaissance, Stream Mitigation Plan, and SEPA Checklist. He identified the ordinary high water mark throughout the project area. He provided design and oversight of stream restoration, which involved approximately 210 feet Herrera Environmental Consultants, Inc. www.herrerainc.com Kris Lepine, PWS, page 2 of stream channel, including extensive large woody debris installation for grade control structures, bank stabilization, and stream cover. The design included single and multi -log grade control structures that minimise erosion and provide fish habitat. Mr. Lepine prepared a planting plan for the site that improved habitat by replacing dominant Himalayan blackberries with a diverse assortment of native shrubs. He coordinated all environmental permits and approvals on the project including a Section 404 permit from the U.S. Army Corps of Engineers, a Hydraulic Project Approval permit from the Washington State Department of Fish and Wildlife, City of Redmond Permits, Endangered Species Act compliance, and approval from the Muckleshoot Indian Tribe. Talbot Road/Perrinville Creek Drainage Improvement and Habitat Enhancement Edmonds, WA Mr. Lepine is the lead ecologist responsible for environmental permitting and mitigation on a City of Edmonds Public Works drainage project that involves replacing a storm water pipe and relocating an outfall to Perrinville Creek. Mitigation measures include improving fish passage and habitat. Mr. Lepine identified the ordinary high water mark of Perrinville Creek and delineated a wetland associated with the stream. He co- authored a Critical Areas Report for the project, which includes stream restoration and wetland mitigation measures. He is working alongside stream engineers to develop fish -passable structures, riparian wetlands, and a streamside native planting plan. In addition, he co-authored a No Effect letter in support of Endangered Species Act (ESA) compliance. Mr. Lepine is coordinating permitting efforts on the project, which includes obtaining a Section 404 nationwide permit from the Corps of Engineers, a Hydraulic Project Approval from the Washington Department of Fish and Wildlife, and a critical areas review from the City of Edmonds. City of Bellevue Vasa Creek Check Dam Repairs Bellevue, WA Mr. Lepine is the lead ecologist and permit coordinator responsible for environmental permitting and mitigation on a City of Bellevue Utilities project that involves repairing nine check dams on Vasa Creek, which are needed to stabilize the stream within a steep ravine that is at risk of severe erosion. Mitigation measures include installing wood structures to provide habitat and restoring wetlands and buffers that are temporarily disturbed during construction. Mr. Lepine is providing oversight of wetland and stream delineation and has authored the mitigation component of the Critical Areas Report which included designing a native planting plan. He is also responsible for in-house technical review of the No Effect letter in support of Endangered Species Act compliance, SEPA Environmental Checklist, and the Joint Aquatic Resource Permit Application. Brightwater Wastewater Treatment System Predesign King/Snohomish County, WA During the predesign phase of the Brightwater Regional Wastewater Treatment System project, Mr. Lepine prepared environmental documents for the King County Wastewater Treatment Division (KCWTD) in support of permitting the construction of various sites associated with the conveyance system. He conducted wetland delineations and ordinary high water mark surveys for sites in unincorporated Snohomish County, the City of Kenmore, and the City of Bothell. In addition, he prepared conceptual wetland mitigation plans for sites where impacts to wetlands and or streams are unavoidable. These documents were submitted to federal, state, and local jurisdictions in support of Section 404 Clean Water Act, Shoreline Substantial Development, and grading permits. Kent/Auburn Conveyance System Improvements Pacific, Algona, Auburn, and Kent, WA Mr. Lepine served as lead biologist conducting environmental studies for the King County Wastewater Treatment Division in support of a wastewater conveyance project that will increase the capacity of the sewer system in the Green River South Planning Area by installing new pipes, re-routing flows, and replacing pipes. Herrera Environmental Consultants, Inc. www.herrerainc.com William T. Laprade, LEG Engineering Geologist Education: BS, Geological Sciences, University of Washington, 1981 MA, Geography, Arizona State University, 1973 BA, Geography, Clark University, 1967 Post -Graduate Studies, Engineering Registration: Certified Engineering Geologist, Oregon, E844, 1982 Licensed Engineering Geologist, Washington, 111, 2001 Associations: Association of Engineering Geologists Geological Society of America, Fellow Northwest Geological Society, Past -President Seattle University, adjunct professor, Engineering Geology American Water Works Association Washington State Geologists Licensing Board, Chair Bill Laprade has more than 37 years of experience in all phases of geotechnical consulting: geologic reconnaissance, field exploration planning, drilling operations and logging, feasibility studies, design, construction monitoring, and construction management. His years of experience in the Pacific Northwest have made him an expert on local geology and soil conditions. His specialties include interpretation of glacial stratigraphy for design of civil works projects, slope stability evaluations in a multitude of geologic conditions, timberland mass wasting in mountainous terrain, and the geotechnical aspects of hydroelectric facilities, including small and large diameter pipelines. He has also served as an expert consultant for the geologic aspects of construction claims. Bill was the principal investigator for a study that involved more than 1,400 landslides for the City of Seattle. ■ Snohomish County PUD, Low Impact Hydroelectric Sites, Snohomish County, WA. Bill evaluated a group of 30 potential sites for development of hydroelectric power facilities on creeks and rivers in the Cascade Mountains with civil engineers and biologists. Using existing geologic information and previous reports (where available) on the sites, Bill and the other professionals pared down the sites to 10 through a ranking process, and then visited the top four sites for a more definitive evaluation. He provided the group with decisive analysis of the geologic conditions and the geotechnical issues at each site, along with conceptual methods to overcome the physical constraints of the sites. ■ Puget Sound Energy, Thunder Creek Hydroelectric Project, Skagit County, WA. As Project Manager, Bill performed engineering geologic reconnaissance for 5 miles of pipeline, transmission lines, and access roads and managed subsurface exploration program (including helicopter -borne access) in rugged mountainous terrain at the Thunder Creek Hydroelectric Project. He also prepared Sediment & Erosion Control Plan for submission to state and federal agencies. ■ Seattle Public Utilities, Burke -Gilman Drainage Basin Studies, Seattle, WA. As Project Manager and Geologist, Bill provided reconnaissance of a steeply sloping drainage basin that is tributary to Lake Washington, and identified 20 potential landslide problem areas that may affect water supply, storm sewers, and sanitary sewers. Preliminary cost estimates were produced for remedial measures for each potential problem area. 111 SHANNON MMILSON, INC. William T. Laprade, LEG Page 2 ■ Southwest Suburban Sewer District, Seahurst Beach Sewer Line Restoration (Pump Station No. 7), Burien, WA. Bill supervised geotechnical studies for this project, including subsurface explorations, a data report and feasibility evaluations of the dewatering and excavation. Shannon & Wilson biologists are also providing local, state, and federal permitting assistance for proposed improvements and expansion of an existing sanitary sewer line and pump stations in the vicinity of Seahurst Park. ■ City of Bremerton Department of Public Works & Utilities, Bremerton Sewer and Boardwalk Project, Bremerton, WA. Bill served as Project Manager for the replacement of about 3,900 feet of sewer force main in a Puget Sound beach and a new 3/-mile-long, off -shore, pile -supported boardwalk. Bill supervised geologic evaluation of beach and unstable sea bluff; barge -borne, off -shore exploration program; and evaluation of erosion along shoreline. ■ Des Moines Utility District, Geologic Studies for Sewer Line, Des Moines, WA. Bill performed explorations and geologic studies for sewer line along the edge of the 50-foot- high Zenith Bluff in Des Moines where geologic conditions make utilities risky. ■ City of Renton Public Works, Honey Creek Interceptor Sewer, Renton, WA. Bill performed geologic reconnaissance, geotechnical report, and construction monitoring for Honey Creek Interceptor Sewer in the bottom of a narrow, steep -walled ravine. ■ Geologic Engineering at Inverness Park, Seattle, WA. Bill performed construction monitoring for subdrainage interceptor trench system at Inverness Park in Seattle where recent and pre -historic landsliding had created chaotic topography. The drain has kept the hillside stable for more than 20 years. . ■ King County Department of Natural Resources, Wastewater Treatment Division, Fairwood Interceptor, Renton, WA. Bill served as Project Manager and Geologist for three phases of a sewer conveyance system including a 2,600-foot-long horizontal directional drill (HDD) beneath a 200-foot-deep ravine that is a tributary to Madsen Creek. He directed the field explorations, interpreted the geologic conditions, and completed the geotechnical reports for the project. ■ JUB Engineers, Richland Sewer Interceptor, Richland, WA. Bill managed the exploration program and prepared a report for the Richland sewer interceptor and treatment plant in alluvial and glacial outwash deposits. ■ STS, Heislers Creek Hydroelectric Project, Acme, WA. Bill completed a geologic and soils report and the Erosion and Sediment Control Plan for the proposed Heislers Creek Hydroelectric Project near Acme. Complex geologic conditions (sedimentary and igneous rocks and glacial soils) provided a challenge for siting the project. ■ Weyerhaeuser, Watershed Analysis, Willapa Headwaters and Stillman Creek, WA. As Project Geologist, Bill completed the mass -wasting module for watershed analyses in the Willapa Headwaters and Stillman Creek watershed administrative units. This involved analyzing aerial photographs and field reconnaissance to create a landslide inventory, writing the mass wasting module report, and participating in the synthesis, handoff, and prescription phases of the process. E M SHANNON MMILSON, INC. Lawrence M. West, LHG Hydrogeologist Education: BS, Geology, California State University, Northridge, 1972 MBA, Seattle City University, 1981 Registration: Registered Geologist, Oregon, #188, 1977 Certified Engineering Geologist, Oregon, #E188, 1977 Licensed Geologist, Engineering Geologist, Hydrogeologist, #1257, Washington Associations: Association of Ground Water Scientists and Engineers Geological Society of America Larry West has 37 years of experience in ground water management, development, control and protection. Mr. West has conducted a number of ground water investigations, focusing on both the ground water influence on surface water, and the influence of surface water on groundwater. In addition to the projects listed below, Mr. West has conducted over 150 construction dewatering evaluations and dewatering system designs across the United States and overseas. ■ Alderwood Water and Wastewater District, North Creek Sewer Replacement Pre- Design/Design Dewatering Evaluations, Snohomish County, WA. Larry conducted analyses for alternative alignments for 3.5 miles of sewer in Bothell, Washington. Analyses included determining most appropriate approach for construction dewatering, evaluation of dewatering discharge disposal options and cost estimates. Final design studies include installation of deep confined aquifer observation wells, pumping tests, calculation of dewatering flows and preparation of dewatering specifications for bidding. ■ Alderwood Water and Wastewater District, Everett Basin Study Technical Memorandum, Snohomish County, WA. Larry served as Project Engineer for a preliminary investigation to reroute sewage flows from several basins within the South Everett area. A conceptual design for rerouting and conveying the flows for seven alternatives was developed. The alternatives included pump stations (capacities of 1,300 to 5,200 gpm), force mains (12-24 inch), and gravity sewers (12-42 inch). From these conceptual designs, planning level project costs were developed for near term and future flows. Allied costs included potential capacity charges. Project costs varied from $10 million to $47 million. ■ HDR Engineers, Kent/Auburn Interceptor Sewers Dewatering Evaluations, Green River Valley, WA. Larry managed and conducted dewatering evaluations for 3 King County Wastewater Division sewer replacements extending from Kent to Auburn and Pacific, Washington. Larry provided review of prior geotechnical studies, determined dewatering issues and estimated dewatering flows. He also prepared specifications for contract documents. ■ Dewatering Evaluation, Keyes Improvement Project, Stanislaus, County, CA. Larry estimated dewatering flows and dewatering approaches for a new wastewater pump station and 12,000 feet of sewer trench excavation. His evaluation included an assessment of the impact of the existence or absence of a low permeability aquitard beneath the pump station excavation and drawdown with distance to determine the potential for structure settlement due to dewatering. 116 SHANNON 6WILSON, INC. Lawrence M. West, LHG Page 2 ■ Seattle Public Utilities, Thornton Creek, Jackson Park Golf Course Detention Pond Dewatering, Shoreline, WA. Larry investigated and evaluated dewatering requirements for the construction of three detention ponds constructed as part of the Thornton Creek restoration. Excavations required depressurization of a shallow but highly artesian aquifer (potentiometric levels 12 feet above ground surface). Larry designed the dewatering system for the City, prepared specifications and oversaw the contractor's installation and operation of the complex well and wellpoint system. He worked with the contractor for the City to ensure excavations did not result in a breach of the confining layer and flooding of the golf course and project area. The successful dewatering resulted in a smooth -running project that was under schedule and no change orders due to dewatering problems. ■ Redwood Water and Sewer Utility, Redwood Conveyance Dewatering, Grants Pass, OR. Larry evaluated the available geotechnical data to assess the best approach for bidding construction dewatering along 7,000 feet of pipeline in the Grants Pass area for the Redwood Water and Sewer Utility. Analyses included two pump stations and four stream crossings. Larry recommended a specification and bidding approach that allowed contractors to provide competitive and reasonable bids for the construction dewatering of the project. ■ City of Tacoma Department of Public Works, Puyallup Avenue Sewer Dewatering System, Tacoma, WA. Larry developed sump, wellpoint and deep well design for nearly 12,000 feet of 8-foot diameter sewer excavation through an old industrial part of Tacoma, Washington. The program included disposal options to handle the contaminated soil and groundwater encountered during excavation and dewatering. ■ Pierce County Public Works Department, Pierce County Sludge Disposal Siting EIS, Pierce County, WA. Larry developed hydrogeologic siting criteria and siting suitability map for disposal of municipal treatment plant sludge. He conducted a site - specific evaluation of six most favored sites and performed environmental impact assessment of selected 8,000-acre site. ■ City of Longview, Emergency Sewer Dewatering, Longview, WA. Larry provided design and system installation oversight for a 10 well, 1,500 GPM dewatering system to allow repair for a ruptured sewer. The design, well construction and drawdown was achieved in less than 3 weeks allowing the contractor to effect repairs in a shored excavation in record time. ■ Northeast Sammamish Sewer & Water District, Lift Station #3 Sewer Dewatering, Redmond, WA. Larry managed and conducted hydrogeologic evaluations for the design and construction of a dewatering system to depressurize an artesian aquifer along the 600-foot alignment for the connection sewer between the old and new lift stations. The project included the construction of 10 dewatering wells, pumping tests and computer modeling to ensure contractor had sufficient capacity to control artesian pressures during excavation and sewer installation. 110 SHANNON WLSON, INC, Brian S. Remick, PE Geotechnical Engineer Education: MS, Civil Engineering, Oregon State University, 2002 BS, Civil Engineering, Oregon State University, 2000 Registration: Registered Professional Engineer, Washington, 42820, 2006 Associations: American Society of Civil Engineers (ASCE) Management & Public Administration Committee (MPAC), Registration Coordinator, August 2008 to Present Brian Reznick has 8 years of professional experience in geotechnical and civil engineering. During his career, Brian has worked on several levee projects in the Puget Sound region, including levees on the Cedar, Green, Snoqualmie and Skagit Rivers. He was responsible for preparing levee project scopes and budgets, developing subsurface exploration and laboratory testing programs, managing field and laboratory work, completing design analyses, preparing reports, managing staff for the analyses and report preparation, and reviewing plans and specifications. His technical expertise encompasses design of shoring, ground improvement, piles, slope stability analysis, and liquefaction evaluation. He has been involved in construction observation including mass soil excavation, fill placement and compaction, pile installation, and shoring installation and testing. ■ City of SeaTac, Sunrise View Stormwater Bypass, SeaTac, WA. The city of SeaTac proposed a stormwater bypass pipeline to alleviate flooding of down slope residences from stormwater runoff. As Project Manager, Brian managed the subsurface exploration and sampling, laboratory testing, and geotechnical engineering analyses for the project. Engineering recommendations included loads on buried pipes, uplift pressures due to groundwater, ground settlement, and a permanent earth retention structure at the pipe outfall. Temporary excavation, shoring, and dewatering recommendations were also included in our report. ■ University of Washington, Clark Road Culvert Replacement, Seattle, WA. The Clark Road culvert replacement project is located at Clark Road, along the northeast portion of the University of Washington campus. The project area is part of the Ravenna Creek drainage basin flowing year round into Lake Washington through the former Montlake Landfill. Due to settlement damage and the need for greater flow capacity, the existing 42 inch diameter culvert was replaced with a 14- by 8.58-foot corrugated metal pipe arch culvert. The new culvert was partly filled with a gravel mix to promote fish habitat. Soil conditions consisted of loose sand mixed with wood and municipal solid waste underlain by peat. As Project Engineer, Brian provided the geotechnical recommendation for the cofferdam shoring, temporary cut slopes, and subgrade overexcavation and backfill for the project. The new subgrade was improved with geotextiles and quarry spalls for foundation support, and a clay liner to mitigate contamination. Brian oversaw the geotechnical recommendations and project plan design for the Mechanically Stabilized Earth (MSE) abutment walls surrounding the culvert and supporting Clark Road. Brian also managed the construction excavation and shoring observation for the project. ■ King County, Cedar Rapids Geotechnical Study, Renton, WA. King County plans to install engineered wood structures anchored with timber piles along a section of the Cedar River to limit the lateral extent of channel migration and to support the formation of complex aquatic habitat. Brian was the Project Manager and coordinated efforts with Ili SHANNON 6WILSON, INC. Brian S. Reznick, PE Page 2 the owner and design team, and supervised staff during subsurface explorations, timber pile analyses, and report preparation. Brian also contacted local contractors in an effort to identify construction feasibility and cost for the project. ■ King County, Reddington Setback Levee, Auburn, WA. King County is proposing to construct a setback levee and extension along river miles 27.5 to 29.5 of the Green River to increase flood and sediment capacity, improve ecological habitat, and reduce the flood hazard to neighboring county residences and the associated costs of flood hazard management. As Project Manager, Brian is currently managing the project, coordinating efforts with the owner and design team, and supervising staff during the analysis. The project will include collection and review of surface and subsurface information, and performing subsurface explorations, in -situ soil testing, and laboratory testing. Geotechnical and hydrogeologic analyses will be performed to identify a proposed levee location and provide design and construction recommendations. Analysis will include characterizing foundation soils and evaluating slope stability, seepage, liquefaction, and uplift. Shannon & Wilson will also provide geotechnical recommendations for protecting and/or moving existing utilities in the proposed construction zone, and conceptual geotechnical recommendations for relocation of the Auburn Pump Station. ■ United States Army Corps of Engineers, Skagit River Levee General Investigation, Skagit County, Washington. The project is a study of flood risks for levees along the lower 30 miles of the Skagit River. Brian is the Project Manager for the study. He coordinates efforts with the Corps, Skagit County, and the surrounding Dike Districts. He compiled existing Corps geotechnical information about the levees including: subsurface exploration logs; flood damage reports and repair letters; levee plans, cross -sections, and profiles; and aerial and ground photographs. After the information was presented to the Corps, Brian coordinated efforts to perform subsurface explorations and soil sampling along specific levee sections where seepage has been documented. The exploration program included paired borings with groundwater monitoring wells in and behind the levee. With the paired borings, the groundwater response to river level fluctuations can be analyzed to improve seepage analyses. The study included characterizing the geologic conditions, in situ groundwater testing, and geotechnical laboratory data that included soil index, permeability, consolidation, and strength testing. ■ King County, South Fork Snoqualmie Levee Evaluation, King County, WA. King County proposes to rebuild and strengthen a select portion of the existing levee system in the North Bend area between South Fork Snoqualmie River miles 2 and 7. The levee system has geotechnical deficiencies including potential overtopping, seepage, seepage -induced slope instability and scour. Brian was the Project Manager for the levee evaluation and coordinated efforts with the owner. Brian helped develop a subsurface exploration and sampling program, and supervised the staff during the field program and hydrogeologic field tests, sample review, and laboratory testing. _=1 1SHANNON &WILSON, INC. Stanley R. Boyle, PhD, PE Geotechnical QC & Design Review Education: PhD, Geotechnical Engineering, University of Washington, 1995 MS, Structural Engineering, Carnegie-Mellon University, 1984 BS, Civil Engineering, University of Vermont, 1983 Registration: Registered Professional Civil Engineer, WA, 35805, 1999; CO, 26991, 1990; AK, 11831, 2007 Associations: American Society of Civil Engineers (ASCE) Geo-Institute Task Force on MSE Wall Design North American Geosynthetics Society; Intl. Geosynthetics Society American Council of Engineering Companies Dr. Stanley Boyle has 25 years experience in construction and design. Since joining Shannon & Wilson, Stan has evaluated and designed trenched and tunneled pipeline installations, retaining structures, highway and railroad embankments, excavation shoring systems, impoundment dikes, structure and bridge foundations. He has developed recommendations for improving stability of landslides throughout the western United States, for reconstruction of riverbanks, and for construction near rivers and waterways. He has developed recommendations for shoring and dewatering of excavations for trenches, pump stations, and tunnel access shafts; evaluated and developed recommendations for mitigating liquefaction susceptibility of a water pipeline and embankment foundations; developed recommendations for staged embankment construction of embankments over weak and compressible soils; developed recommendations for compaction grouting of loose soil below a large structure; designed pile -supported utility protection structures; and designed embankments constructed of lightweight materials to reduce settlement. ■ Alderwood Water and Wastewater District, Low Pressure Area Improvements Project, Alderwood, WA. The Water District needed a second water line to supply additional water pressure for an area of the City. Stan evaluated the feasibility of proposed alignments and construction alternatives, and assisted in production of the geotechnical report and specifications. Most of the approximately 10,000-foot long water line was installed in trenches. The project included a 110-foot long 24-inch diameter jack and bore crossing under SR-525 and an approximately 50-foot long 12-inch diameter HDPE Horizontal Directional Crossing under environmentally sensitive Swamp Creek. ® Seattle Public Utilities, Atlas Place Drainage Improvements, Seattle, WA. Stan was the Project Geotechnical Engineer for this slope stability evaluation project. The goal of the project was to evaluate the risk to public utilities that traverse a known landslide area in a residential community. Subsurface explorations and geologic reconnaissance were performed and used in conjunction with previous explorations that had been performed the project area to evaluate geologic and hydrogeologic conditions. Slope stability analyses were performed and recommendations presented for protecting the utilities. ■ City of Tacoma Public Works Department, Reservation Junction Sewer Relocation, Tacoma, WA. Stan was the Project Engineer and Manager for the installation of a 60- inch-diameter sanitary sewer. The project included tunneling below four active railroad tracks. Where cut -and -cover installation of the pipe was feasible, design recommendations were provided for foundation improvement, shoring, concrete pipe sleds to support the pipe over soft soils and provide lateral support for the pipe, and means to resist buoyancy under seasonal high groundwater conditions. EI11 SHANNON MMILSON, INC. Stanley R. Boyle, PhD, PE Page 2 Recommendations were provided for installing augercast piles for a 140-foot-long, three - span railroad bridge constructed over new and existing pipelines. Specifications were developed for pipe foundation improvement, tunneling, and augercast piles. ■ Kitsap County South Central Force Main Replacement, Kitsap County Public Works, Kitsap County, WA. Stan was geotechnical lead for this project to provide geotechnical recommendations to upgrade and realign two force main sewer pipes and install a reuse water force main. We performed explorations and analyses to provide recommendations for excavation, excavation support, dewatering, reuse of excavated material, and pipe loads. We also provided recommendations for replacing three culverts to provide fish passage and spread foundations for a farm access bridge. ■ Highline Water District, Three Tree Point Water System Improvements, Burien, WA. Stan was Project Engineer and Manager for this water system improvement project to replace aging and undersized pipelines. Stan performed geologic reconnaissance, supervised the exploration and laboratory testing program, and prepared recommendations for excavation, pipe bedding and backfill, and horizontal directional drilling of two pipeline segments. ■ Port of Tacoma, Gog-le-hi-te II Habitat Project, Tacoma, WA. Stan served as Principal -in -Charge for geotechnical engineering for design and construction of a levee and wetland along the Puyallup River. About 1800 feet of new levee was constructed 500 to 800 feet behind the existing levee, and the area between the new and existing levee was shaped for wetland and habitat development. After characterizing subsurface conditions and soil properties, we provided levee design and construction recommendations that satisfied Corps of Engineers requirements, short and long-term embankment settlement, erosion protection, and seepage. Recommendations were provided for including geosynthetic reinforcement below and in the levee to improve constructability and static stability, for protecting existing utilities and structures, and for reuse of onsite materials in levee construction and habitat contouring. ■ King County Department of Natural Resources, Sammamish River Restoration, Redmond, WA. For the proposed reconstruction of 1,400 feet of the Sammamish River Channel where it flows through Marymoor Park, Stan served as Shannon & Wilson's Project Manager. The purpose of the project was to restore meanders that were removed when the river was straightened approximately 40 years ago, improve fish habitat, and create a more natural environment at the site. Shannon & Wilson provided geologic reconnaissance and interpretation, subsurface explorations, laboratory testing of soils, slope stability analyses, and development of recommendations to stabilize the channel slopes and bed and perform proposed earthwork. E III SHANNON &WILSON, INC. Hammond Collier Wade Livingstone ROBERT L. HILLEBRAND, P.L.S. - SURVEY MANAGER Mr. Hillebrand has 30 years of survey experience and is responsible for overseeing all aspects of our survey department including survey crews, fieldwork, and work products. He has extensive experience in both engineering surveying and land surveying. These areas include: topographic surveys, ALTA surveys, boundary surveys, construction coordination, and route surveys. EDUCATION 9' Survey Mathematics; AutoCAD with Softdesk and LDD; Land Surveying, Related Law, Legal Descriptions; and GPS Surveying Procedures and Practices — 1985 to Present: Renton Vocational College Advanced Cadastral Sur—veying, Land Surveying — 1996 Bellevue Community College LICENSE / REGISTRATION e Washington State P.L.S. (2000) CQ National Land Surveyor in Training (1996) AFFILIATIONS T Land Surveyors Assoc. of Washington (LSAW) 30 TEARS EXPERIENCE SANITARY SEWER SURVEYS Mukilteo Water and Wastewater District, Big Gulch Emergency Sewer Trunk Repair and Stream Restoration jt, City of Entiat, Topography and Right-fo-Way Mapping `O City of East Wenatchee, Topography and Right - of -Way Mapping Douglas County Sewer District, Columbia Avenue Right -of -Way Mapping WATER SURVEYS Woodinville Water District, Topo Survey City of Bellevue Water Line Improvement 0 Grant County PUD No.2, Nason Creek Weir Stream Puget Sound Energy, Datum Resolution at Lake Tapps 09 Dan Frank DNR Water Way Lease TRANSPORTATION SURVEYS City of Kenmore, SR-522 HOV Enhancement Project City of Bothell, SR-527 Improvement Project City of Leavenworth Street Improvement TO City of Leavenworth, Topography and Right -of - Way Mapping City of Steilacoom, Topography and Right -of - Way Mapping City of Wenatchee Sidewalk Improvements OTHER SURVEYS VO City of Seattle Facilities, Condominium Conversion of the Talking Book and Braille Library CQ Woodinville Water District, Kingsgate Reservoir Improvement Project TO Grant County PUD #2 Jacobs Civil, Priest Rapids Hatchery HAMMOND WADE LIVINGSTONE ROBERT J. MACAULAY, MAI Washington State License No. 1100517 EDUCATION 1983 B.A. Economics, Washington State University 2009 Almost 100 hours of classes and seminars sponsored by the Appraisal Institute, including Uniform Appraisal Standards for Federal Land Acquisitions, Evaluating Commercial Construction, Real Estate Finance Statistics and Valuation Modeling (complete list available upon request). 2007 USPAP National Course 2006 Eminent Domain and Condemnation 2005 Subdivision Valuation, Appraisal Institute Special Purpose Properties, Appraisal Institute 2004 Real Estate Finance, Value and Investment Performance, Appraisal Institute Appraisal Consulting, Appraisal Institute 2003 USPAP - Courses 400 & 420 2002 Environmental & Property Dangers, Appraisal Institute & Center for Advanced Property Economics 1986 to 2001 Real Estate Appraisal Principles IA-1; Basic Valuation Procedures IA-2; Capitalization Theory & Techniques IB- A; Capitalization Theory & Techniques IB-B; Case Studies in Real Estate Valuation 2-1; Standards of Professional Practice - SPP; Report Writing and Valuation Analysis 2-2; Standards of Professional Practice, Module A; Advanced Applications; Standards of Professional Practice, Module B; Comprehensive Appraisal Workshop; Advanced Sales Comparison and Cost Approach Analysis; Partial Interest Valuation - Undivided; Case Studies in Commercial Hi hest and Best Use, Standards of Professional Practice, Part C (430). EXPERIENCE 10/89 to present Macaulay & Associates, Ltd. 2/86 to 10/89 Schueler, McKown & Keenan, Inc., Seattle, WA. 8/84 to 1/86 UnderwTiter/Secondary Market Analyst Weyerhaeuser Mortgage Co., Los Angeles, CA. Appraisal assignments include a wide variety of commercial, industrial and residential properties for financial institutions, governmental entities, law firms, corporations and private individuals. Examples include office buildings, retail shopping centers, multi -family residential complexes, industrial warehouses; restaurants, retail stores, mobile home parks, service stations, single family subdivisions and special purpose properties. Other valuation assignments cover rental valuations, partial interest studies (leasehold/leased fee estates), waterfront commercial and industrial properties for various port authorities, together with remote large acreage agricultural and forest land. Also, experience with real estate counseling for private individuals. Local improvement district (LID) special benefit and feasibility study experience includes a variety of road improvement, utility and other infrastructure projects. The firm's extensive experience with these projects dates back to 1975. Between 1990 and 2000, in addition to over 30 other feasibility and special benefit studies, almost a dozen major assignments were completed for projects costing from $1.5 to $82 million. Clients included the cities of Bothell, Issaquah, Lacey, Lake Stevens, Lynnwood, Ocean Shores, Redmond and Spokane. Details on individual projects will be provided upon request. Since 2000, major special benefit/proportionate assessment studies have included road improvement projects for the cities of Burien and Covington (2003), a freeway interchange and arterial improvement project for the City of Sumner (2002 to 2004), a utility local improvement district for the City of Lake Stevens (2005), a city-wide road improvement project for the City of Ocean Shores (2006 to 2007) and a project improving access to the Southcenter regional shopping mall for the City of Tukwila (2006 to 2008). In the last two years (2006 to 2008), economic feasibility studies have been completed for the cities of Ferndale, Freeland, Kent, Lynnwood, Ocean Shores and Yelm. Macaulay & Associates, Ltd. EXPERIENCE (con't. A wide variety of multi -parcel right-of-way acquisition appraisals have been completed, such as riverbank protection easements for the City of Tukwila, right-of-way acquisition for road widening for the City of Bellingham and utility line easements, road widening and other public improvement projects for the City of Everett. A large right-of-way project for the Montana Department of Highways near Kalispell, Montana was completed several years ago. Also, eminent domain appraisals have been completed for the Washington State Department of Transportation (WSDOT) and Burlington Northern Santa Fe Railroad in Wenatchee and Tacoma. Other special purpose assignments are 6,000 acres on the Tulalip Indian Reservation for the Tulalip Tribes, 80 acres on Burrows Island in Skagit County, 900 acres in Skagit County for Skagit County Parks and Recreation Department, and the Eagle Harbor ferry maintenance site on Bainbridge Island for WSDOT. Various reports on mineral rights have been completed, including an 80-acre operating quarry in Bremerton, WA. BUSINESS AND PROFESSIONAL AFFILIATIONS Macaulay & Associates, Ltd., Real Estate Appraisers and Consultants Everett, WA. MAI designation, Appraisal Institute (Member No. 10,712) Certified Real Estate Appraiser - General Classification, State of Washington (License No. 1100517) Approved Appraiser and Review Appraiser, Washington State Department of Transportation Member International Right -of -Way Association Board of Trustees - Washington Center for Real Estate Research, Washington State University, Pullman, WA. COURT AND HEARING Testified in various cases in King, Snohomish and Skagit counties, together with presentations at LID hearings on preliminary and final a cvccmrnt mllc Ch'slifie.rl as exnert witness in the states of Washington and Montana. SUMMARY OF APPRAISAL CLIENTS Financial Institutions Private Corporations AEGON Realty Advisors Weyerhaeuser Company Northwest Life Assurance Co. of Canada The Boeing Company US Bank of Washington Coates Field Service, Inc. First Interstate Bank of Washington Pharos Corporation Evertrust Bank Universal Field Service First Heritage Bank Gray & Osborne, Inc. American First National Bank Earth Tech Frontier Bank Anderson Hunter Commerce Bank Foster Pepper Shefelman Coastal Community Bank Burgess, Fitzer, Leighton & Phillips Prime Pacific Bank Inslee, Best & Dozier Horizon Bank Perteet Engineering North County Bank Preston, Gates & Ellis GOVERNMENTAL AGENCIES City of Everett National Park Service City of Lynnwood US Navy City of Issaquah University of Washington City of Mount Vernon Everett School District City of Bellingham Mukilteo School District City of Edmonds Monroe School District City of Mukilteo Lake Stevens School District City of Spokane Tulalip Tribes of Washington City of Pacific Washington State Dept. of Transportation City of Port Angeles Montana Department of Highways City of Stanwood Snohomish County City of Washougal King County Port of Everett Island County Port of Anacortes Skagit County PUD US Army Corps of Engineers Skagit County Parks & Recreation Department Snohomish County PUD No. I Macaulay & Associates, Ltd. Robert J. Macaulay, MAI Page 2 IPI: Interactive Pipe Inspection 855 Trosper Rd SW 108-206 Tumwater, WA 98512 360.507.1814 pipeexperts@msn.com Experience Dennis i as over 30 years In the l)J`aste Water Insr;action and Rehabiiitatior Field. His iri ial start in the irdustry was with Cues inc where he trained Cities in the operation of Closed Circuit TV! Tor sevier Inspection. For over 15 ;'ears, Dennis h-as been at the forefront of T renc,'iless Sew_r Technology. As a contractor spec alizing in inspection, rehabilitation, and repair methods, Dennis founded PIPE EXPERTS. The Experts pride themselves on taking on the cifficult projects that other contractors say carnet be done - and c'onipleting them with success. Dennis has knov,dedge of all facets of the industry vvhlci r allows him to problem solve the toughest challenges. Dennis recently "Mrided IPI' Interactive Pipe Inspector.; a corporation specializing in high technology pipeline inspection. IPI s on the cutting edge of technology and providing asset maragement data, for municipalities and cities. Education Shoreline Community College United States N:-:vv and Naval Reserve: Ret-ed as Lieutenant Commander One of the Foulnders of Washington State Association oT Collection; Svstern Personnel Key Projects King County Metro - Annual TV Contract for large Diameter Pipe - 21 inch to 12 feet. Have Inspected over 1 million feet of King County Metro interceptor Lines King County i,,.4etrc -Annual Claar!ing Contract. Cieanina of Sand Catchers and Vaults, King County ;Metro -TV Inspection of 4 ,gOg Feet of Serer lines under Lake Washington, All manholes were under water requiring divers to se, alur i Purr, ca ssors for nspeotions. City of Spokane, WA - Annual contract fGr ins13c 701 o` serer lines. Margaret Nelson Archaeologist Education: Ph.C., Anthropology, University of Washington, 1986 (Ph.D abd) B.A., English, University of Washington, 1978 Margaret has worked in the Pacific Northwest as an archaeologist for the past 28 years managing cultural resource management projects including surveys, monitoring projects, testing, and data recovery excavations in western and eastern Washington, Idaho, and Oregon. Her experience includes managing numerous Section 106 process projects and preparation of cultural resource overviews, and evaluations for NEPA EA and EIS, SEPA, and. As a project manager Margaret has been responsible for a wide variety of archaeological investigations for underground utility lines including most recently wastewater/sewer system projects for the King County Wastewater Division and the City of Centralia. Selected Project Examples: Riparian Habitat Restoration projects, Chelan County, WA (2007— 2010). Managed and participated in surveys for salmon enhancement projects subject to Section 106 for the Bonneville Power Administration and US Forest Service. Directed fieldwork, authored and co-authored technical reports and Level III documents for individual and on -call contracts with the Chelan County Natural Resource Department and Cascadia Conservation District. Cama Beach Archaeological Data Recovery Project, Camano Island, Island County, WA (2004 — 2008) Directed crew of 10 — 25 in data recovery excavations totaling 138 m3 at a large late prehistoric shell midden. Conducted feature analysis, participated in archaeo-botanical analysis, wrote/co-wrote sections of technical report, co -edited technical report; wrote sections of popular summary. Conducted for Washington State Parks and Recreation Commission. Total cost for archaeological portion of the project was about $1.6 million. • Cedar River Municipal Watershed projects, King County, WA (2004 — 2008) Project manager for survey and monitoring projects for on -call contract with Seattle Public Utilities. Wrote or co -wrote technical reports. Co-authored study of ethnographic and prehistoric fire use in central Cascades for predictive modeling within Cedar River Watershed. Prepared for Seattle Public Utilities, Seattle, WA. • Archaeological Treatment Plan and Monitoring for the Port Angeles Graving Dock Remediation Project, Clallam County, WA (2007) Project manager for monitoring of deconstruction activities at location of large prehistoric village/cemetery. Co-authored monitoring report and archaeological site treatment plan for Remediation Project Memorandum of Agreement. 2007 • City of Centralia Sewer Replacement Project, Lewis County, WA (2009). Project manager for Section 106 survey of 2.3 mile sewer upgrade corridor in CA5CADIA ARCHAEOLOGY Margaret Nelson Page 2 archaeologically sensitive setting. Conducted background research, directed fieldwork, and prepared technical report. Cultural Resources Assessment of the Barton, Murry, North Beach, and South Magnolia Sub -basins, Seattle, King County, WA (2009-2010) Project manager, conducted background research into historic and prehistoric cultural resources, developed predictive model for site distribution, prepared document for use by King County Wastewater Division to define areas with low cultural resource sensitivity where stormwater overflow facilities could be installed. CASCADIA' ARCHAEOLOGY