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RS_Drainage_Technical_Information_Report_180423_v1
Core Design, Inc. WANG SHORT PLAT i Singh Short Plat Table of Contents 1 PROJECT OVERVIEW ..................................................................................................................... 1 Figure 1-1: Vicinity Map ..................................................................................................... 2 2 CONDITIONS AND REQUIREMENTS SUMMARY ........................................................................... 3 2.1 Core Requirements ............................................................................................................... 3 2.1.1 Core Requirement #1: Discharge at the Natural Location ............................................ 3 2.1.2 Core Requirement #2: Offsite Analysis .......................................................................... 3 2.1.3 Core Requirement #3: Flow Control .............................................................................. 3 2.1.4 Core Requirement #4: Conveyance System .................................................................. 3 2.1.5 Core Requirements #5: Erosion and Sediment Control ................................................. 3 2.1.6 Core Requirement #6: Maintenance and Operations ................................................... 3 2.1.7 Core Requirement #7: Financial Guarantees and Liability ............................................ 3 2.1.8 Core Requirement #8: Water Quality ............................................................................ 3 2.1.9 Core Requirement #9: Flow Control BMPs .................................................................... 3 2.2 Special Requirement #1: Other Adopted Area-Specific Requirements ................................ 4 2.2.1 Critical Drainage Areas ................................................................................................... 4 2.2.2 Master Drainage Plan .................................................................................................... 4 2.2.3 Basin Plans ..................................................................................................................... 4 2.2.4 Salmon Conservation Plans (SCPs) ................................................................................. 4 2.2.5 Stormwater Compliance Plans (SWCPs) ........................................................................ 4 2.2.6 Lake Management Plans (LMPs) .................................................................................... 4 2.2.7 Flood Hazard Reduction Plan Updates (FHRPs) ............................................................. 4 2.2.8 Shared Facility Drainage Plans (SFDPs) .......................................................................... 4 2.3 Special Requirement #2: Floodplain / Floodway Delineation ............................................... 5 2.4 Special Requirement #3: Flood Protection Facilities ............................................................ 5 2.5 Special Requirement #4: Source Controls ............................................................................. 5 2.6 Special Requirement #5: Oil Control ..................................................................................... 5 3 OFFSITE ANALYSIS ......................................................................................................................... 6 TASK 1 Study Area Definition and Maps ..................................................................................... 6 Core Design, Inc. WANG SHORT PLAT ii TASK 2 Resource Review ............................................................................................................. 6 TASK 3 Field Investigation ........................................................................................................... 7 Figure 3-1: Downstream Drainage Exhibit......................................................................... 8 TASK 4 Drainage System Description and Problem Description ................................................. 9 TASK 5 Mitigation of Existing and Potential Problems ................................................................ 9 4 FLOW CONTROL AND WATER QUALITY DESIGN ........................................................................ 13 4.1 Predeveloped Site Hydrology .............................................................................................. 13 4.2 Developed Site Hydrology ................................................................................................... 14 Figure 4-1: Existing Conditions Exhibit ............................................................................ 15 Figure 4-2: Developed Conditions Exhibit ....................................................................... 16 4.3 Performance Standards....................................................................................................... 17 4.4 Flow Control System ........................................................................................................... 18 4.5 Water Quality Calculations ................................................................................................. 20 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN .......................................................................... 22 6 SPECIAL REPORTS AND STUDIES ................................................................................................. 23 7 OTHER PERMITS .......................................................................................................................... 24 8 ESC ANALYSIS AND DESIGN ........................................................................................................ 25 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT ...................... 26 9.1 Bond Quantities .................................................................................................................. 26 9.2 Facility Summaries .............................................................................................................. 26 9.3 Declaration of Covenant ..................................................................................................... 26 10 OPERATIONS AND MAINTENANCE ........................................................................................... 27 Core Design, Inc. WANG SHORT PLAT iii Appendix A – Parcel & Basin Information King County Parcel Report (0007200196) Appendix B – Resource Review & Off-site Analysis Documentation Aquifer Protection Zone FIRM Map Coal Mine Hazard Map Erosion Hazard Map Slide Hazard Map Steep Slopes Map Drainage Complaints Exhibit Appendix C – Pond Sizing WWHM Pond Modeling Report Core Design, Inc. WANG SHORT PLAT Page 1 1 PROJECT OVERVIEW The project site is located in the Soos Creek drainage basin, on the northwest side of the 90 degree turn in SE 191st Street / 117th Place SE in the City of Renton, King County. Specifically, the project is in the southwest quarter of Section 33, Township 23 North, Range 5 East, W.M. It is bordered by single family residential on all sides. The King County tax parcel ID number for the existing parcel is shown in Table 1 below (refer to the King County Parcel Reports included in Appendix A). See Figure 1-1: Vicinity Map, provided on the following page. Table 1: Parcel Information KC Parcel # Site Address Site Area (SF) 6198400125 19016 116th Ave SE 88,862 The total project site is 2.04 acres in size and currently has one single family residence at the west end of the property while the remaining 75% or so is completely forested. The site drains to the southwest at a slope ranging between 1 and 10 percent. Proposed development of the property will include constructing six new residences and the associated roads, driveways, utilities and stormwater vault. The existing residence is proposed to remain on the 7th lot. The project will be designed using the guidelines and requirements established in the 2016 King County Surface Water Design Manual (2016 KCSWDM) as well as the 2017 City of Renton Surface Water Design Manual (2017 CRSWDM). The project required to match forested site conditions (or a Conservation Flow Control) and Basic Water Quality treatment. The drainage analysis for detention and water quality treatment was completed using WWHM. Core Design, Inc. WANG SHORT PLAT Page 2 Figure 1-1: Vicinity Map Core Design, Inc. WANG SHORT PLAT Page 3 2 CONDITIONS AND REQUIREMENTS SUMMARY The proposed project is classified as requiring “Full Drainage Review” per the 2016 KCSWDM. Therefore, all eight core requirements and five special requirements will be addressed per Section 1.1 of the 2016 KCSWDM). 2.1 Core Requirements 2.1.1 Core Requirement #1: Discharge at the Natural Location The project will maintain the natural discharge location at the southwest corner of the property. 2.1.2 Core Requirement #2: Offsite Analysis This core requirement is addressed in Section 3 of this report. 2.1.3 Core Requirement #3: Flow Control The detention vault is designed to match the forested condition or Conservation Flow Control. This requires that the developed condition discharge durations match the existing condition durations from 50% of the 2-year to the 50-year storm events and that the developed 2-year and 10-year peak discharge rates do not exceed the existing 2-year and 10-year peak discharge rates, respectively. 2.1.4 Core Requirement #4: Conveyance System A backwater analysis using King County Backwater (KCBW) will be performed as part of the Utility Permit to show that the proposed conveyance system provides sufficient capacity for the 25-year storm as calculated by the Rational Method. 2.1.5 Core Requirements #5: Erosion and Sediment Control Erosion and sediment control will be provided through catch basin protection, interceptor swales, rock check dams, silt fencing and a construction access entrance. 2.1.6 Core Requirement #6: Maintenance and Operations The City of Renton will be responsible for the maintenance and operations of the stormwater facility located in Tract B. An Operations and Maintenance Manual will be provided in Section 10 during the Utility Permit process. 2.1.7 Core Requirement #7: Financial Guarantees and Liability A bond quantities worksheet will be provided in Section 9 as part of the Utility Permit. 2.1.8 Core Requirement #8: Water Quality Basic water quality treatment will be provided dead storage in the detention vault. 2.1.9 Core Requirement #9: Flow Control BMPs This project falls under the “Small Lot BMP” category per Section 1.2.9.2.1 of the 2016 KCSWDM since the proposed lots are less than 22,0000 square feet. Due to site constraints, setbacks, and inadequate native vegetated flow path, full dispersion is not feasible. Due to the dense till Core Design, Inc. WANG SHORT PLAT Page 4 characteristics of the on-site soils and shallow groundwater, the geotechnical engineer suggests that infiltration is also infeasible for the mitigation of stormwater on this project. This includes the use of bioretention and permeable pavement. Basic dispersion, specifically sheet flow dispersion with a 10-foot minimum vegetated flow path is the only feasible BMP for this project. It is proposed that every driveway, patio, and walkway is adequately sheet flow dispersed. Since all of the proposed lots are under 11,000 square feet, a minimum of 10% of the total lot areas are required to be treated by a BMP. All of the lots are between 9,000 and 10,000 square feet so between 900 and 1,000 square feet of surface area shall be mitigated on each of the lots by sheet flow dispersion or another BMP. The driveway area on each property will be at least 30-feet long by 20-feet wide which will account for at least 600 square feet of the required total. If the walkways and patios do not sufficiently make up the remaining 300-400 square feet, then reduced impervious credit or retention of native vegetation will be implemented. The 10% impervious reduction credit for basic dispersion has not been accounted for in the detention vault modeling as a factor of safety, since the credit is negligible anyways. 2.2 Special Requirement #1: Other Adopted Area-Specific Requirements 2.2.1 Critical Drainage Areas Per the City’s Aquifer Protection Zone map, the project is not in an aquifer protection zone. 2.2.2 Master Drainage Plan Not applicable. 2.2.3 Basin Plans There are no basin plans for this project. 2.2.4 Salmon Conservation Plans (SCPs) There are no salmon conservation plans for this project. 2.2.5 Stormwater Compliance Plans (SWCPs) Not applicable. 2.2.6 Lake Management Plans (LMPs) Not applicable. 2.2.7 Flood Hazard Reduction Plan Updates (FHRPs) This project is not within a floodplain and is not within an area with an applicable Flood Hazard Reduction Plan. Therefore, additional requirements from a Flood Hazard Reduction Plan do not apply. 2.2.8 Shared Facility Drainage Plans (SFDPs) Not applicable. Core Design, Inc. WANG SHORT PLAT Page 5 2.3 Special Requirement #2: Floodplain / Floodway Delineation This project is not located within the 100-year floodplain. 2.4 Special Requirement #3: Flood Protection Facilities As this project is not located within a 100-year floodplain there are no levees, revetments or berms within the project. 2.5 Special Requirement #4: Source Controls These requirements are not applicable as the project is not a commercial, industrial or multi- family development. 2.6 Special Requirement #5: Oil Control This requirement does not apply because the project is not a commercial or industrial development nor is it expected to have more than 15,000 vehicles per day. Core Design, Inc. WANG SHORT PLAT Page 6 3 OFFSITE ANALYSIS TASK 1 Study Area Definition and Maps The proposed project contains parcel number 6198400125. A map of the downstream is included at the end of this section as Figure 3-1: Downstream Drainage Exhibit. TASK 2 Resource Review Basin Reconnaissance Summary Reports: No Basin Reconnaissance Summary Reports appear to be available for the area that is within one mile of this project site. FEMA Maps: A FEMA map dated May 16, 1995 number 53033C0991F was reviewed. The site is not located within a floodplain as it is covered by “Zone X – Outside of 500-year floodplain. The FEMA Map is included in Appendix B. Sensitive Areas Folio: The City of Renton Sensitive Areas Maps were reviewed, and this project is not located within any sensitive areas. The maps are included in Appendix B. Soils The Geotechnical Report was completed by Terra Associates, Inc. on February 26, 2018. Field exploration indicated the site is underlain at relatively shallow depths by till-like soils consisting of medium dense to dense silty sand with gravel and light to moderate perched groundwater seepage was encountered in all seven of the test pits. Downstream Drainage Complaints Drainage complaints were researched within the study area. King County lists a few complaints, but they were all closed 1998 or earlier. The City of Renton map shows no drainage complaints within ¼ miles of the site along the downstream system. Restrictive Well Covenant There is no existing well onsite. Core Design, Inc. WANG SHORT PLAT Page 7 TASK 3 Field Investigation The field investigation took place on December 20, 2017. It was approximately 38 degrees, partly sunny, and had just finished raining for a few days prior. Upstream Tributary Area There appeared to be trace amounts of upstream runoff. The adjacent upstream properties have recently been developed and most of the runoff is tributary to a flow control facility that has a discharge that bypasses the project site. Downstream Analysis The downstream analysis began at the southeast corner of the site where runoff is collected by a type 1 catch basin in the north side of 191st street. The flow is then conveyed to the east via 12-inch pipe and type 1 catch basins for approximately 120 feet where it then turns south across 191st and enters a type 2 catch basin. The flow turns and heads east again, via 24-inch diameter pipe and type 2 catch basins approximately another 275 feet. The flow discharges into a large detention/water quality pond located at the southwest corner of the intersection of SE 191st Street and 120th Ave SE. The pond discharges near the west edge of 120th Ave SE and flows southerly to a birdcage type 2 structure (which also picks up the ditch which flows above the subject pipe) located in the northwest corner of the intersection of 120th Ave SE and SE192nd Street via 12-inch diameter pipe. The system continues south for another 20 feet. Still in the north side of 192nd, the flow turns east and heads down the hill via 12-inch diameter pipe for another 300 feet, where the downstream analysis ends beyond ¼ mile downstream of the project site. There were no signs of erosion, flooding, or capacity issues along the entire downstream path. FIGURE 3-1: DOWNSTREAM DRAINAGE EXHIBIT 2,257376 City of Renton Print map Template This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, current, or otherwise reliable. THIS MAP IS NOT TO BE USED FOR NAVIGATIONWGS_1984_Web_Mercator_Auxiliary_Sphere Notes None 12/20/2017 Legend 256 0 128 256 Feet Information Technology - GIS RentonMapSupport@Rentonwa.gov City and County Boundary Addresses Parcels Network Structures Inlet Manhole Utility Vault Unknown Structure Control Structure Pump Station Discharge Point Water Quality Detention Facilities Pond Tank Vault Wetland Stormwater Main Culvert Open Drains Virtual Drainline Facility Outline Private Network Structures Inlet Manhole Utility Vault Unknown Structure Private Control Structure Private Discharge Point Private Water Quality Private Detention Facilities Pond Tank Vault Wetland Private Pipe Private Culvert Private Open Drains Private Facility Outline Flow Control BMP Fence Drainage Complaints Known Drainage Issues Renton King County Core Design, Inc. WANG SHORT PLAT Page 9 TASK 4 Drainage System Description and Problem Description There are no drainage complaints within ¼ mile along the downstream system that remain open beyond 1998. TASK 5 Mitigation of Existing and Potential Problems Downstream Drainage Problems Requiring Special Attention Type 1 – Conveyance System Nuisance Problems There are no known, reported or observed current downstream conveyance nuisance problems. Type 2 – Severe Erosion Problems There are no known, reported or observed current downstream severe erosion problems. Type 3-Severe Flooding Problems There are no known, reported or observed current downstream severe flooding problems. Downstream Water Quality Problems Requiring Special Attention Type 1 – Bacteria Problems Big Soos Creek has Category 5 Bacteria problems. Refer to the listing at the end of this section. Type 2 – Dissolved Oxygen (DO) Problems Big Soos Creek has Category 5 Dissolved Oxygen problems. Refer to the listing at the end of this section. Type 3 – Temperature Problems Big Soos Creek has Category 2 temperature problems. Refer to the listing at the end of this section. Type 4 – Metals Problems There are no known or reported downstream metals problems. Type 5 – Phosphorous Problems There are no known or reported downstream phosphorous problems. Type 6 – Turbidity Problems There are no known or reported downstream turbidity problems. Core Design, Inc. WANG SHORT PLAT Page 10 Type 7 – High pH Problems Big Soos Creek has Category 2 pH problems. Refer to the listing at the end of this section. Bioassessment There are no known or reported downstream bioassessment problems. Core Design, Inc. WANG SHORT PLAT Page 11 Core Design, Inc. WANG SHORT PLAT Page 12 Drainage Adjustments There are no proposed drainage adjustments. Core Design, Inc. WANG SHORT PLAT Page 13 4 FLOW CONTROL AND WATER QUALITY DESIGN 4.1 Predeveloped Site Hydrology The total project area is approximately 2.047 acres, however, the 0.053 acres of ROW dedication along 116th Ave SE and work within the existing ROW is removed from the flow control analysis since it’s in a separate threshold discharge area than that of the rest of the project site. The 116th Ave SE system does not converge with the rest of the project site’s downstream system within ¼ mile. Since the new plus replaced impervious area for the frontage improvements in 116th Ave SE is less than 5,000 square feet (2,776 square feet total), flow control is not required. With the ROW dedication and frontage improvements for 116th Ave SE removed from the tributary area to the vault, the total project area becomes 1.994 acres (2.047 acres total minus 2,310 square feet of dedication). The site is currently developed with one single family residence and a shed along the west side of the property, while the rest of the site is forested. The site currently slopes between 1 and 10 percent to the southeast. There is trace amounts of upstream area tributary to the site as the surrounding properties upslope of the project site have recently been developed and have flow control facilities in place that bypass the project site with their discharge. Historic site conditions are assumed for all existing onsite areas per Section 1.2.3.1 of the 2016 KCSWDM (page 1-43) and are modeled as C – Forest. The predeveloped areas are summarized in Table 4-1 below and Figure 4-1 Predeveloped Conditions. Table 4-1 Predeveloped Conditions Areas GROUND COVER AREA (acres) Till-Forest 1.994 Existing Peak Flows Predeveloped peak flow rates from WWHM: Core Design, Inc. WANG SHORT PLAT Page 14 4.2 Developed Site Hydrology Lots 1-7 will utilize basic sheet flow dispersion of impervious area. The lot areas, roofs, and new access road will be collected and tight-lined to the proposed detention vault located in a tract at the east end of the site. Table 4-2 below breaks down the impervious and pervious surface areas in the tributary developed basin. Table 4-2 Developed Condition Areas Lot Total Area Land Use Area Max. Impervious by Code (50%) Effective Impervious* Pervious (Grass) sf acre sf acre sf acre sf acre 1 9,837 0.226 4,919 0.113 4,000 0.092 5,837 0.134 2 9,000 0.207 4,500 0.103 4,000 0.092 5,000 0.115 3 9,008 0.207 4,504 0.103 4,000 0.092 5,008 0.115 4 9,009 0.207 4,505 0.103 4,000 0.092 5,009 0.115 5 9,002 0.207 4,501 0.103 4,000 0.092 5,002 0.115 6 9,023 0.207 4,512 0.104 4,000 0.092 5,023 0.115 7 9,268 0.213 4,634 0.106 4,000 0.092 5,268 0.121 ROW 13,540 0.311 - - 11,554 0.265 1,986 0.046 Tract A 9,155 0.210 - - 2,000 0.046 7,155 0.164 Total 86,842 1.994 - - 41,554 0.954 45,288 1.040 *Effective Impervious Area = 4,000 sf or maximum impervious coverage allowed by code (50%), whichever is less (per section 3.2 of the KCSWDM). Therefore, the impervious area draining to the vault in Table 4-2 above is 41,554 square feet, or 0.954 acres. The pervious area draining to the vault is the remaining 1.040 acres of the total tributary area. Developed Peak Flows Developed peak flow rates from WWHM: 4'%1//'0&'&(14#22418#. 4'%1//'0&'&(14#22418#. Core Design, Inc. WANG SHORT PLAT Page 17 4.3 Performance Standards All stormwater facilities are designed in accordance with the 2016 KCSWDM with Conservation Flow Control Standards. The proposed water quality treatment system meets the requirements from the Basic Water Quality Protection Menu. Flow Control: Conservation Flow Control Standard The Conservation Flow Control Standard requires maintaining the durations of high flows at their pre- development levels for all flows greater than one-half of the 2-year peak flow through the 50-year peak flow. The pre-development peak flow rates for the 2-year and 10-year runoff events must also be maintained under this requirement. Conveyance Capacity: The proposed conveyance system will be designed sufficient capacity to convey and contain the 25-year peak flow as determined by the Rational Method during final design. It will also be verified that the 100- year peak flow will not create or aggravate a severe flooding or erosion problem per Section 1.2.2. Water Quality: Basic Water Quality Menu The Basic Water Quality Menu includes one pollutant removal targets: •Total Suspended Solids = 80% reduction The Basic Water Quality Menu, described in detail in Section 6.1.1 of the 2016 KCSWDM (page 6-4), provides eight options to meet the pollutant removal targets listed above. •Option 1: Biofiltration Swale •Option 2: Filter Strip •Option 3: Wetpond •Option 4: Wetvault •Option 5: Stormwater Wetland •Option 6: Combined Detention and Wetpool Facilities •Option 7: Sand Filter •Option 8: StormFilter The project proposes to apply Option 4, a Wetvault. More detailed discussion and preliminary sizing calculations of the flow control and water quality treatment facility proposed for this project follows later in this section. More detailed discussion and preliminary sizing calculations of the flow control and water quality treatment facility proposed for this project follows later in this section. Core Design, Inc. WANG SHORT PLAT Page 18 4.4 Flow Control System Calculation of Lot Impervious Area The impervious area per lot applied to the developed basin time series file was determined using the criteria in the 2016 KCSWDM page 3-27. The proposed development is urban residential. The site is zoned R-4 (see parcel information in Appendix A). The minimum impervious area per lot per the 2016 KCSWDM (page 3-27) would either be 4,000 square feet or the maximum impervious area based on zoning, whichever is less. The maximum impervious surface allowed in the R-4, zone in the City of Renton, is 50%. Small Lot BMP Requirements If the proposed project is on a site/lot smaller than 22,000 square feet, then flow control BMPs must be applied as specified in the requirements below or the project must demonstrate compliance with the LID Performance Standard (described in Section 1.2.9.1.B, p. 1-83) using an approved continuous runoff model. This project is not in compliance with the LID performance standard and has evaluated the following BMPs in order of precedence: 1.Full Dispersion – A native flowpath of 100 feet and no steeper than 20% per the requirements of Appendix C, Section C2.1.1 cannot be met so full dispersion is infeasible. The project site is also located in an erosion and landslide hazard area. 2.Full Infiltration of Roof Runoff – Full infiltration is not feasible because of the soils low infiltration capacity. 3.All target surfaces not mitigated by requirements 1 and 2 above, must be mitigated to the maximum extent feasible using one or more of the BMPs from the following list: •Full and limited infiltration are not feasible, per the geotechnical engineer. 4.All target surfaces not mitigated by requirements 1, 2 and 3 above, must be mitigated to the maximum extent feasible using basic dispersion. Basic dispersion is proposed for the driveways and walkway/patio areas. However, no flow control credit is assumed for basic dispersion. 5.BMPs must be implemented, at a minimum for an impervious area equal to at least 10% of the site/lot for site/lots up to 11,000 square feet and at least 20% of the site/lot for site/lot sizes between 11,000 and 22,000 square feet. If these minimum areas are not mitigated using feasible BMPs from Requirements 1, 2, 3 and 4 above either a fee in lieu of the required minimum BMPs must be paid (requires that the City has established a program for determining and utilizing the fees for stormwater focused retrofit projects) or one or more of the BMPs from the following list are required to be implemented to achieve compliance. Core Design, Inc. WANG SHORT PLAT Page 19 •Reduced Impervious Surface Credit – A reduced impervious surface credit will be applied to the remaining area not covered by basic dispersion to meet the minimum 10 percent lot BMP area. •Native Grown Protection Credit – It is not anticipated that a native growth protection credit will be used. 6.The soil moisture capacity of new pervious surfaces must be protected in accordance with the City’s standards. The soil moisture capacity of the developed pervious surfaces will be protected per the City’s standards. 7.Any proposed connection of roof downspouts to the local drainage system must be via a perforated pipe connection. Flow Control WWHM detention modeling resulted in a required vault size of 113’ long x 41’ wide x 4.75’ deep, with a total required live storage volume of 22,006 cubic feet. The proposed vault is 1’ longer and provides 22,201 cubic feet of storage. The detention vault will be located in Tract A at the east end of the site. The detention vault summary is located below and the full report has been included in Appendix C. WWHM Vault Calculation The proposed detention vault includes a three-orifice and one weir control structure. The first orifice is 27/32 inches in diameter and is at the bottom of the riser. The second orifice is 2.55 feet above the outlet and is 13/16 inches in diameter as well. The third orifice is 3.1 feet above the outlet and is 1 inch in diameter. The rectangular weir is ¼ inch wide and extends from the top of the riser (which is 4.75 feet Core Design, Inc. WANG SHORT PLAT Page 20 tall, above the outlet elevation) down 1.1 feet. The 100-year water surface elevation is 5.18 feet above the outlet elevation, which is 0.43 feet above the top of the riser. The flow duration plot below indicates that the vault passes the flow control performance criteria with no positive excursions. The vault will discharge to the existing conveyance system in SE 191st Street at the southeast corner of the project site. 4.5 Water Quality Calculations Option 4 of the Basic Water Quality Protection Menu is a wetvault. Wetvault Wetvaults are sized with a volume equal to the 91% treatment volume and meets the Basic Water Quality goal of 80% TSS removal. The WWHM modeling results below show that the required water Core Design, Inc. WANG SHORT PLAT Page 21 quality treatment volume is 6,468 cubic feet. The proposed water quality/dead storage volume of the detention vault below the live storage is 9,348 cubic feet (2,337 square feet at a depth of 4 feet). Core Design, Inc. WANG SHORT PLAT Page 22 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Conveyance calculations to be provided with the SDP. Core Design, Inc. WANG SHORT PLAT Page 23 6 SPECIAL REPORTS AND STUDIES Geotechnical Report Prepared by: Theodore Schepper, P.E. Dated: February 26, 2018 Terra Associates, Inc. 12220 113th Avenue NE, Ste. 130 Kirkland, WA 98034 Arborist DRAFT Report Prepared by: Favero Greenforest Dated: February 12, 2018 Greenforest Incorporated 4547 South Lucile Street Seattle, WA 98118 Greenforest Incorporated C o n s u l t i n g A r b o r i s t 4547 South Lucile Street, Seattle, WA 98118 Tel. 206-723-0656 TO: Jane Wang REFERENCE: Arborist DRAFT Report SITE ADDRESS: 19016 116th Ave SE Renton, WA 98058 DATE: February 12, 2018 PREPARED BY: Favero Greenforest, ISA Certified Arborist # PN -0143A ISA Tree Risk Assessment Qualified ASCA Registered Consulting Arborist® #379 Introduction You contacted me and contracted my services as a consulting arborist. My assignment is to inspect the regulated trees at the above referenced site. The purpose of this report is to establish the condition of the significant trees to satisfy City of Renton permit submittal requirements. I received a topographic survey from Core Design. I visited the site 10/11/2017and visually inspected the trees indicated on the attached survey, which are the subject of this report. Summary: The following table summarizes the tree quantities and categories inventoried in this report. Significant, Landmark and Dangerous categories are defined by municipal code. Total Significant Trees On Site 58 Landmark Trees On Site 0 Dangerous Trees On Site 21 (Proposed) ROW Trees 12 Offsite Trees 1 Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 2 of 12 Greenforest Registered Consulting Arborist Data for 1 offsite tree (#8136) is also included in this report. The site is relatively flat. A single-family residence is located at the west of the parcel, near 116th Ave SE. A handful of native conifers and fruit trees surround the house. The remaining portion is covered in native growth deciduous trees, and a mix of invasive brambles and understory shrubs. Very few of these deciduous trees are healthy: most are in an obvious state of decline and failure. Additionally, though the site looks heavily forested, most trees are too small, and are not a regulated size. LIMITATIONS AND USE OF THIS REPORT This tree report establishes, via the most practical means available, the existing conditions of the trees on the subject property. Ratings for health and structure, as well as any recommendations are valid only through the development and construction process. This report is based solely on what is readily visible and observable, without any invasive means. There are several conditions that can affect a tree’s condition that may be pre-existing and unable to be ascertained with a visual-only analysis. No attempt was made to determine the presence of hidden or concealed conditions which may contribute to the risk or failure potential of trees on the site. These conditions include root and stem (trunk) rot, internal cracks, structural defects or construction damage to roots, which may be hidden beneath the soil. Additionally, construction and post-construction circumstances can cause a relatively rapid deterioration of a tree’s condition. IDENTIFICATION SCHEME Each tree was marked with a 1” x 3.5” aluminum tag indicating tree number as listed on the attached inventory, and as shown on the attached exhibit. SPECIES AND SIZE OF EACH TREE I measured the trunk diameters (54” from grade) of each tree, and identified each tree by common name. REASON(S) FOR ANY TREE REMOVAL I rated the health and structure/form of each tree (see attached inventory and description below). Trees with significant visible problems or defects are indicated as Dangerous and are not viable for retention (dead, terminally diseased, damaged, or otherwise dangerous to persons or property). Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 3 of 12 Greenforest Registered Consulting Arborist TREE INSPECTION METHOD – TREE HEALTH, CONDITION AND VIABILITY I visually inspected each tree from the ground. I performed a Level 1 risk assessment.1 This is the standard assessment for populations of trees near specified targets, conducted in order to identify obvious defects or specified conditions such as a pre-development inventory. This is a limited visual assessment focuses on identifying trees with imminent and/or probable likelihood of failure, and/or other visible conditions that will affect tree retention. I recorded tree species and size (DBH). I estimated the average dripline of each tree. I rated the condition of each tree, both health and structure. A tree’s structure is distinct from its health. This inspection identifies what is visible with both. High-risk trees can appear healthy in that they can have a dense, green canopy. This may occur when there is sufficient sapwood or adventitious roots present to maintain tree health, but inadequate strength for structural support. Conversely, trees in poor health may or may not be structurally stable. For example, tree decline due to root disease is likely to cause the tree to be structurally unstable, while decline due to drought or insect attack may not. One way that tree health and structure are linked is that healthy trees are more capable of compensating for structural defects. A healthy tree can develop adaptive growth that adds strength to parts weakened by decay, cracks, and wounds. This report identifies unhealthy trees based on existing health conditions and tree structure, and specifies which trees are most suitable for preservation.2 No invasive procedures were performed on any trees. The results of this inspection are based on what was visible at the time of the inspection. The attached tree inventory contains the following information on each tree. Proposed Action indicates if the tree is proposed for retention or removal. Retention Priority indicates if tree is Landmark, >60’ tall, part of a continuous canopy, >18” DBH, or is non-native. 1 Companion publication to the ANSI A300 Part 9: Tree Shrub and Other woody Plant Management – Standard Practices, Tree Risk Assessment. 2011. ISA. 2 Companion publication to the ANSI A300 Part 5: Tree Shrub and Other woody Plant Maintenance – Standard Practices, Managing Trees During Construction. 2008. ISA. Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 4 of 12 Greenforest Registered Consulting Arborist Tree Category as defined by municipal code. (TREE: A woody perennial usually having one dominant trunk, or, for certain species, a multi-stemmed trunk system, with a potential minimum height of ten feet (10') at maturity. Any trees listed on the Complete King County Weed List shall not qualify as a tree.) Dangerous: Any tree that has been certified, in a written report, as dead, terminally diseased, damaged, or otherwise dangerous to persons or property by a licensed landscape architect, or certified arborist. Landmark: A tree with a caliper of thirty inches (30") or greater. (Multiple- stemmed trees are reported as the average using a single integer.) Significant: A tree with a caliper of at least six inches (6"), or an alder or cottonwood tree with a caliper of at least eight inches (8"). Trees qualified as dangerous shall not be considered significant. Trees planted within the most recent ten (10) years shall qualify as significant trees, regardless of the actual caliper. Trees within the right-of-way (and proposed ROW) are not categorized. There are no landmark trees on the project site. Tree number as shown on the attached site exhibit. DBH Stem (trunk) diameter in inches 4.5 feet from grade. Tree Species Common name. Dripline Average branch extension in feet as radius from the trunk. Health & Structure Rating ‘1’ indicates good to excellent condition; no visible health- related problems or structural defects; ‘2’ indicates fair condition; minor visible problems or defects that may require attention or maintenance if the tree is retained, and/or the tree should only remain as a grove tree, and not stand alone; and ‘3’ indicates poor condition; significant visible problems or defects and tree removal is recommended. Visible Defects Obvious structural defects or diseases visible at time of inspection, including: Asymmetric canopy– the tree has an asymmetric canopy from space and light competition from adjacent trees. Branch dieback - mature branches in canopy are dying/dead. Crack – separation of wood fibers and predisposed to failure. Dead – tree is dead. Deadwood – large and/or multiple dead branches throughout canopy. Decay – process of wood degradation by microorganisms resulting in weak and defective structure. Diseased – foliage and trunk/stems are diseased. Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 5 of 12 Greenforest Registered Consulting Arborist Dogleg in trunk – trunk with a bow or defective bend (90°) in trunk often half way of further up the trunk. Double leader – the tree has multiple stem attachments, which may require maintenance or monitoring over time. Included bark – an inclusion of bark at the attachment of multiple leaders and is preventing a wood-to-wood attachment Ivy - dense ivy prevents a thorough inspection, and other defects may be present. Multiple leaders - the tree has multiple stem attachments, which may lead to tree failure and require maintenance or monitoring over time. Previous failure – tree trunk previously broken and defective. Slender – tree lacks adequate trunk taper to stand lone. Sweep in trunk – characterized by a leaning lower trunk and a more upright top. Suppressed – tree crowded by larger adjacent trees; with defective structure and/or low vigor. Retain tree only as a grove tree, not stand-alone. Sweep – tree leans away from adjacent trees. Characterized by a leaning lower trunk and a top that is more upright. Topped – the tree is previously topped and has poor structure and/or stem decay. Type indicates if tree is Deciduous (D) or Evergreen (E). Viability - a determination by the arborist whether the tree is viable for retention. LIMITS OF DISTURBANCE Limits of Disturbance (LOD) are calculated for all the retained significant trees (and for trees on adjoining parcels with overhanging driplines). They are listed below as radii in feet from the trunk for the side of the tree to be impacted by construction. They are determined using rootplate 3 and trunk diameter,4,5 and ISA Best Management Practices.6 These are the minimum distances from the trees for any soil disturbance, and represent the area to be protected during construction. These LOD are malleable and may be adjusted during the design and construction process. The following table lists the limits of disturbance of each tree. Limits of Disturbance in feet as radius from tree trunk. Limits of Disturbance 3 Coder, Kim D. 2005. Tree Biomechanics Series. University of Georgia School of Forest Resources. 4 Smiley, E. Thomas, Ph. D. Assessing the Failure Potential of Tree Roots, Shade Tree Technical Report. Bartlett Tree Research Laboratories. 5 Fite, Kelby and E. Thomas Smiley. 2009. Managing Trees During construction; Part Two. Arborist News. ISA. 6 Companion publication to the ANSI A300 Series, Part 5: Managing Trees During Construction. 2008. ISA. Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 6 of 12 Greenforest Registered Consulting Arborist Tree No. DBH Tree Species DL North East South West 8123 16” Western red-cedar 12’ 10’ 10’ 10’ PL 8124 13” Douglas-fir 14’ 8’ 8’ 8’ PL 8125 13” Western red-cedar 12’ 8’ 8’ 8’ PL 8197 18” Black cottonwood 18’ PL 10’ 10’ 10’ G 8” Black cottonwood 10’ 8’ 8’ 8’ 8’ H 10” Black cottonwood 11’ PL 8’ 8’ 8’ K 11” Bigleaf maple 14’ PL 8’ 8’ 8’ Y 29” Black cottonwood 20’ PL 16’ 16’ 16’ GG 10” Black cottonwood 12’ PL 8’ 8’ 8’ The attached Tree Retention Plan provides protection that exceeds these established LOD. Protective fencing is erected at the tree’s dripline, which is a greater distance for all retained trees. IMPACT OF NECESSARY TREE REMOVAL SUPPLEMENTAL TREES Supplemental trees are required and will include 32 three-inch caliper trees. Replalcement The report shall include planting and maintenance specifications TREE RETENTION PRIORITY CRITERIA Trees are indicated according to Priority One criteria as provided in RMC 4-4-130H.1.b. in the attached inventory. TREE RETENTION AND LAND CLEARING REGULATIONS 4.4.130 §H.9. Protection Measures During Construction: Protection measures in this subsection shall apply for all trees that are to be retained. All of the following tree protection measures shall apply: a. Construction Storage Prohibited: The applicant may not fill, excavate, stack or store any equipment, dispose of any materials, supplies or fluids, operate any equipment, install impervious surfaces, or compact the earth in any way within the area defined by the drip line of any tree to be retained. b. Fenced Protection Area Required: Prior to development activities, the applicant shall erect and maintain six-foot (6') high chain link temporary construction fencing around the drip lines of all retained trees or at a distance surrounding the tree equal to one and Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 7 of 12 Greenforest Registered Consulting Arborist one-quarter feet (1.25') for every one inch (1") of trunk caliper, whichever is greater, or along the perimeter of a tree protection tract. Placards shall be placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected Trees,” or on each side of the fencing if less than fifty feet (50'). Site access to individually protected trees or groups of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In addition, the applicant shall provide supervision whenever equipment or trucks are moving near trees. c. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to be raised, the applicant shall construct a dry rock wall or rock well around the tree. The diameter of this wall or well must be equal to the tree’s drip line. d. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install impervious surface material within the area defined by the drip line of any tree to be retained. e. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around any tree to be retained may not be lowered within the greater of the following areas: (i) the area defined by the drip line of the tree, or (ii) an area around the tree equal to one and one-half feet (1-1/2') in diameter for each one inch (1") of tree caliper. A larger tree protection zone based on tree size, species, soil, or other conditions may be required. (Ord. 5676, 12-3-2012) f. Mulch Layer Required: All areas within the required fencing shall be covered completely and evenly with a minimum of three inches (3") of bark mulch prior to installation of the protective fencing. Exceptions may be approved if the mulch will adversely affect protected ground cover plants. (Ord. 5676, 12-3-2012) g. Monitoring Required during Construction: The applicant shall retain a certified arborist or licensed landscape architect to ensure trees are protected from development activities and/or to prune branches and roots, fertilize, and water as appropriate for any trees and ground cover that are to be retained. h. Alternative Protection: Alternative safeguards may be used if determined to provide equal or greater tree protection. (Ord. 5676, 12-3-2012) RECOMMENDATIONS Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 8 of 12 Greenforest Registered Consulting Arborist Attachments: 1. Assumptions and Limiting Conditions 2. Certification of Performance 3. Significant Tree Inventory 4. Tree Retention Plan 5. Planting and Maintenance Specifications Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 9 of 12 Greenforest Registered Consulting Arborist Attachment No. 1 - Assumptions & Limiting Conditions 1. A field examination of the site was made 10/112/217. My observations and conclusions are as of that date. 2. Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/arborist can neither guarantee nor be responsible for the accuracy of information provided by others. 3. I am not a qualified land surveyor. Reasonable care was used to match the trees indicated on the sheets with those growing in the field. 4. Construction activities can significantly affect the condition of retained trees. All retained trees should be inspected after construction is completed, and then inspected regularly as part of routine maintenance. 5. Unless stated other wise: 1) information contained in this report covers only those trees that were examined and reflects the condition of those trees at the time of inspection; and 2) the inspection is limited to visual examination of the subject trees without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied that problems or deficiencies of the subject tree may not arise in the future. 6. All trees possess the risk of failure. Trees can fail at any time, with or without obvious defects, and with or without applied stress. A complete evaluation of the potential for this (a) tree to fail requires excavation and examination of the base of the subject tree. Permission of the current property owner must be obtained before this work can be undertaken and the hazard evaluation completed. 7. The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made. Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 10 of 12 Greenforest Registered Consulting Arborist Attachment No. 2 - Certification of Performance I, Favero Greenforest, certify that: • I have personally inspected the trees and the property referred to in this report and have stated my findings accurately. • I have no current or prospective interest in the vegetation or the property that is the subject of this report and have no personal interest or bias with respect to the parties involved. • The analysis, opinion, and conclusions stated herein are my own and are based on current scientific procedures and facts. • My analysis, opinion, and conclusions were developed and this report has been prepared according to commonly accepted arboricultural practices. • No one provided significant professional assistance to me, except as indicated within the report. • My compensation is not contingent upon the reporting of a predetermined conclusion that favors the cause of the client of any other party nor upon the results of the assessment, the attainment of stipulated results, or the occurrence of any subsequent events. I further certify that I am a member in good standing of International Society of Arboriculture (ISA), and the ISA PNW Chapter, I am an ISA Certified Arborist (#PN-0143A) and am Tree Risk Assessment Qualified, and am a Registered Consulting Arborist® (#379) with American Society of Consulting Arborists. I have worked as an independent consulting arborist since 1989. Signed: GREENFOREST, Inc. By Favero Greenforest, M. S. Date: Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 11 of 12 Greenforest Registered Consulting Arborist Attachment No. 3 – Tree Inventory Jane Wang RE: Arborist DRAFT Report, 19016 116th Ave SE Renton, WA 98058 February 12, 2018 Page 12 of 12 Greenforest Registered Consulting Arborist Core Design, Inc. WANG SHORT PLAT Page 24 7 OTHER PERMITS Utilities Permit Building Permits ROW Use Permit NPDES Permit Core Design, Inc. WANG SHORT PLAT Page 25 8 ESC ANALYSIS AND DESIGN Erosion control design to be provided during the SDP. Core Design, Inc. WANG SHORT PLAT Page 26 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT 9.1 Bond Quantities A Site Improvement Bond Quantity Worksheet to be provided with the SDP 9.2 Facility Summaries A facility summary sheet will be provided with the submittal of the final plat. 9.3 Declaration of Covenant Not applicable. Core Design, Inc. WANG SHORT PLAT Page 27 10 OPERATIONS AND MAINTENANCE The operations and maintenance information will be provided with the Utilities Permit through select portions from Appendix A of the 2016 KCSWDM and Site Development Permit plan set. Core Design, Inc. WANG SHORT PLAT Page 28 APPENDICES Core Design, Inc. WANG SHORT PLAT Page 29 Appendix A – Parcel & Basin Information King County Parcel Report (0007200196) Fair, Equitable, and Understandable Property Valuations You're in: Assessor >> Look up Property Info >> eReal Property Department of Assessments 500 Fourth Avenue, Suite ADM- AS-0708, Seattle, WA 98104 Office Hours: Mon - Fri 8:30 a.m. to 4:30 p.m. TEL: 206- 296-7300 FAX: 206- 296-5107 TTY: 206- 296-7888 Send us mail ADVERTISEMENT New Search Property Tax Bill Map This Property Glossary of Terms Area Report Print Property Detail PARCEL DATA Parcel 619840-0125 Name CHINA PRODUCTS INC Site Address 19016 116TH AVE SE 98058 Residential Area 051-006 (SW Appraisal District) Property Name Jurisdiction RENTON Levy Code 2128 Property Type R Plat Block / Building Number 1 Plat Lot / Unit Number 6 Quarter-Section-Township- Range SW-33-23-5 Legal Description NORTHWESTERN GARDEN TRS #4 LESS E 30 FT PLat Block: 1 Plat Lot: 6 LAND DATA Highest & Best Use As If Vacant SINGLE FAMILY Highest & Best Use As Improved PRESENT USE Present Use Single Family(Res Use/Zone) Land SqFt 88,862 Acres 2.04 Percentage Unusable Unbuildable NO Restrictive Size Shape NO Zoning R-4 Water WATER DISTRICT Sewer/Septic PRIVATE Road Access PUBLIC Parking ADEQUATE Street Surface PAVED Views Waterfront Rainier Territorial Olympics Cascades Seattle Skyline Puget Sound Lake Washington Lake Sammamish Lake/River/Creek Other View Waterfront Location Waterfront Footage 0 Lot Depth Factor 0 Waterfront Bank Tide/Shore Waterfront Restricted Access Waterfront Access Rights NO Poor Quality NO Proximity Influence NO Designations Nuisances Historic Site Current Use (none) Nbr Bldg Sites Adjacent to Golf Fairway NO Adjacent to Greenbelt NO Other Designation NO Deed Restrictions NO Development Rights Purchased NO Easements NO Native Growth Protection Easement NO DNR Lease NO Topography Traffic Noise MODERATE Airport Noise Power Lines NO Other Nuisances NO Problems Water Problems NO Transportation Concurrency NO Other Problems NO Environmental Environmental NO BUILDING Building Number 1 Year Built 1956 Year Renovated 0 Stories 1 Living Units 1 Grade 6 Low Average Grade Variant 0 Condition Good Basement Grade 1st Floor 1,350 1/2 Floor 0 2nd Floor 0 Upper Floor 0 Click the camera to see more pictures. Picture of Building 1 Floor plan of Building 1 ADVERTISEMENT Reference Links: King County Tax Links Property Tax Advisor Washington State Department of Revenue (External link) Washington State Board of Tax Appeals (External link) Board of Appeals/Equalization Districts Report iMap Recorder's Office Scanned images of surveys and other map documents Scanned images of plats Notice mailing date: 07/20/2017 Search Kingcounty.gov Home How do I... Services About King County Departments King County Department of Assessments Finished Basement 0 Total Finished Area 1,350 Total Basement 0 Basement Garage 0 Unfinished 1/2 0 Unfinished Full 0 AGLA 1,350 Attached Garage 0 Bedrooms 3 Full Baths 1 3/4 Baths 0 1/2 Baths 0 Heat Source Electricity Heat System Elec BB Deck Area SqFt 0 Open Porch SqFt 0 Enclosed Porch SqFt 0 Brick/Stone 0 Fireplace Single Story 0 Fireplace Muilti Story 0 Fireplace Free Standing 1 Fireplace Additional 0 AddnlCost 0 Obsolescence 0 Net Condition 0 Percentage Complete 0 Daylight Basement View Utilization Accessory Of Building Number: 1 Accessory Type Picture Description SqFt Grade Eff Year %Value Date Valued PRK:DET GAR 26' x 26 670 3 Poor 1947 TAX ROLL HISTORY Account Valued Year Tax Year Omit Year Levy Code Appraised Land Value ($) Appraised Imps Value ($) Appraised Total Value ($) New Dollars ($) Taxable Land Value ($) Taxable Imps Value ($) Taxable Total Value ($) Tax Value Reason 619840012501 2017 2018 2128 252,000 130,000 382,000 0 252,000 130,000 382,000 619840012501 2016 2017 2128 240,000 122,000 362,000 0 240,000 122,000 362,000 619840012501 2015 2016 2128 240,000 118,000 358,000 0 240,000 118,000 358,000 619840012501 2014 2015 2128 240,000 104,000 344,000 0 240,000 104,000 344,000 619840012501 2013 2014 2128 288,000 13,000 301,000 0 288,000 13,000 301,000 619840012501 2012 2013 2128 288,000 9,000 297,000 0 288,000 9,000 297,000 619840012501 2011 2012 2128 288,000 9,000 297,000 0 288,000 9,000 297,000 619840012501 2010 2011 2128 315,000 13,000 328,000 0 315,000 13,000 328,000 619840012501 2009 2010 2128 315,000 30,000 345,000 0 315,000 30,000 345,000 619840012501 2008 2009 2128 315,000 118,000 433,000 0 315,000 118,000 433,000 619840012501 2007 2008 4250 276,000 110,000 386,000 0 276,000 110,000 386,000 619840012501 2006 2007 4250 251,000 94,000 345,000 0 251,000 94,000 345,000 619840012501 2005 2006 4250 242,000 78,000 320,000 0 242,000 78,000 320,000 619840012501 2004 2005 4250 131,000 115,000 246,000 0 131,000 115,000 246,000 619840012501 2003 2004 4250 131,000 115,000 246,000 0 131,000 115,000 246,000 619840012501 2002 2003 4250 126,000 106,000 232,000 0 126,000 106,000 232,000 619840012501 2001 2002 4250 120,000 98,000 218,000 0 120,000 98,000 218,000 619840012501 2000 2001 4250 115,000 85,000 200,000 0 115,000 85,000 200,000 619840012501 1999 2000 4250 96,000 133,000 229,000 0 96,000 133,000 229,000 619840012501 1998 1999 4250 90,000 99,000 189,000 0 90,000 99,000 189,000 619840012501 1997 1998 4250 0 0 0 0 82,000 91,000 173,000 619840012501 1996 1997 4250 0 0 0 0 82,000 85,700 167,700 619840012501 1994 1995 4250 0 0 0 0 82,000 85,700 167,700 619840012501 1992 1993 4250 0 0 0 0 98,400 69,300 167,700 619840012501 1990 1991 4250 0 0 0 0 57,200 69,300 126,500 619840012501 1988 1989 4230 0 0 0 0 43,700 33,700 77,400 619840012501 1986 1987 4230 0 0 0 0 35,100 30,700 65,800 619840012501 1984 1985 4230 0 0 0 0 37,000 31,900 68,900 619840012501 1982 1983 4230 0 0 0 0 37,000 31,900 68,900 SALES HISTORY Excise Number Recording Number Document Date Sale Price Seller Name Buyer Name Instrument Sale Reason 2885073 8/22/2017 $749,995.00 Recorder's Office recently updated records search application. Buyer and seller names are temporary not displayed here. Please click the excise number on the left to visit Recorder's Office site. 1757842 20000608000651 6/7/2000 $245,000.00 WELDON MARIE FERN PHAM THINH+THUY T LE+LE THANH SON Statutory Warranty Deed None Information for... Residents Businesses Job seekers Volunteers King County employees Do more online Trip Planner Property tax information & payment Jail inmate look up Parcel viewer or iMap Public records More online tools... Get help Contact us Customer service Phone list Employee directory Subscribe to alerts Stay connected! View King County social media © King County, WA 2016 Privacy Accessibility Terms of use 1359938 199402250638 2/7/1994 $145,000.00 COTTON LAILA M WELDON MARIE FERN Warranty Deed None REVIEW HISTORY PERMIT HISTORY HOME IMPROVEMENT EXEMPTION New Search Property Tax Bill Map This Property Glossary of Terms Area Report Print Property Detail ADVERTISEMENT Updated: March 17, 2016 Share Tweet Email Print Information for...Do more online Get help Core Design, Inc. WANG SHORT PLAT Page 30 Appendix B – Resource Review & Off-site Analysis Documentation Aquifer Protection Zone FIRM Map Coal Mine Hazard Map Erosion Hazard Map Slide Hazard Map Steep Slopes Map Drainage Complaints Exhibit LAKE WASHINGTON Big Soos CreekLAKE WASHINGTON M a y C r e e k Cedar RiverCedar River Cedar RiverLAKE YOUNGS PANTHER LAKE LAKE WASHINGTON Soos CreekLAKE WASHINGTONLAKE WASHINGTON 60003000 k k k k k k k k k k k k k k k k k k k k k k k k k k k kk k k k k k k k k k k k k k k k k k k k HoquiamAveNEE Valley Hwy84thAveSNEParkD r SW 7th St SE 128th St SE 192nd StLindAveSWMainAveSS 132nd St Factory PlN Talbot Rd SN 3rd St RainierAveS 164thAveSETukwila Pk w y SPuget Dr NE 4th St S 3rd St S 1 2 9 th S t68thAveSSWSunsetBlvd SW 16th St 116thAveSEN 4th St I n t e r u r b a n Av e S WilliamsAveNBronsonW a y N NE7thSt 124thAveSES 7th St SERenton IssaquahRd Rai ni er AveNNewcastle Way CoalCr e e k PkwySESW 41st St T a ylo r P l N WNESunsetBlvdWellsAveNUnionAveNEN E 3 rd S tHa r die A v eSWS180th St Maple Valley Hwy 140thAveSES G ra d yWayS 2 1 s tSt BensonRdSRe nt o n AveS87thAveS128thAveSE148thAveSESW 43rd St SEC arrR d SE 168th St Beaco n A v e S 68thAveSLoganAveN108thAveSEForestDr SE S2ndSt 141 s tAve S ERainierAveS 156thAveSES E 183rd StBenson Dr SS 124th StS 43rd St Airport Way S W G radyW a y S E J o n e s RdSunsetBlvdN Puget Dr SESE 204th W aySW 34th StMo n s ter RdSW S E 1 4 2 n d P lWestValleyHwySSEMay ValleyRd SunsetBlvdNS C a r r RdHouserWayNNewcastle GolfClubRd S 133rd St WilliamsAveSWellsAveSEMercerWay154thPlSEDuvallAveNELoganAveSMonroeAveNESunsetBlvdNEEdmondsAveNEStevens AveNWRai ni er AveSTalbotRdSOakesdaleAveSWTaylorAveNW164thAveSERainierAveSWestVal leyHwyWestValleyHwyParkAveN108thAveSE6 6 t h Av e SWMercerWayWMercer W ay LakemontBlvdSE132ndAve SELakeWashingtonBlvdNE140thWaySE East Valley Rd68thAveS³City of RentonSensitive Areas 0 0.5 10.25 Miles Information Technology - GISmapsupport@rentonwa.govPrinted on: 11/12/2014 Data Sources: City of Renton, King County This document is a graphic representation, not guaranteedto survey accuracy, and is based on the best informationavailable as of the date shown. This map is intended forCity display purposes only. Renton City Limits k Education Fire Station K Valley Medical Center Coal Mine Hazards Severity HIGH MODERATE UNCLASSIFIED Coordinate System: NAD 1983 HARN StatePlane Washington North FIPS 4601 FeetProjection: Lambert Conformal ConicDatum: North American 1983 HARN k k k k k k k k k k k k k k k k k k k k k k k k k k k kk k k k k k k k k k k k k k k k k k k k HoquiamAveNEE Valley Hwy84thAveSNEParkD r SW 7th St SE 128th St SE 192nd StLindAveSWMainAveSS 132nd St Factory PlN Talbot Rd SN 3rd St RainierAveS 164thAveSETukwila Pk w y SPuget Dr NE 4th St S 3rd St S 1 2 9 th S t68thAveSSWSunsetBlvd SW 16th St 116thAveSEN 4th St I n t e r u r b a n Av e S WilliamsAveNBronsonW a y N NE7thSt 124thAveSES 7th St SERenton IssaquahRd Rai ni er AveNNewcastle Way CoalCr e e k PkwySESW 41st St T a ylo r P l N WNESunsetBlvdWellsAveNUnionAveNEN E 3 rd S tHa r die A v eSWS180th St Maple Valley Hwy 140thAveSES G ra d yWayS 2 1 s tSt BensonRdSRe nt o n AveS87thAveS128thAveSE148thAveSESW 43rd St SEC arrR d SE 168th St Beaco n A v e S 68thAveSLoganAveN108thAveSEForestDr SE S2ndSt 141 s tAve S ERainierAveS 156thAveSES E 183rd StBenson Dr SS 124th StS 43rd St Airport Way S W G radyW a y S E J o n e s RdSunsetBlvdN Puget Dr SESE 204th W aySW 34th StMo n s ter RdSW S E 1 4 2 n d P lWestValleyHwySSEMay ValleyRd SunsetBlvdNS C a r r RdHouserWayNNewcastle GolfClubRd S 133rd St WilliamsAveSWellsAveSEMercerWay154thPlSEDuvallAveNELoganAveSMonroeAveNESunsetBlvdNEEdmondsAveNEStevens AveNWRai ni er AveSTalbotRdSOakesdaleAveSWTaylorAveNW164thAveSERainierAveSWestVal leyHwyWestValleyHwyParkAveN108thAveSE6 6 t h Av e SWMercerWayWMercer W ay LakemontBlvdSE132ndAve SELakeWashingtonBlvdNE140thWaySE East Valley Rd68thAveS³City of RentonSensitive Areas 0 0.5 10.25 Miles Information Technology - GISmapsupport@rentonwa.govPrinted on: 11/12/2014 Data Sources: City of Renton, King County This document is a graphic representation, not guaranteedto survey accuracy, and is based on the best informationavailable as of the date shown. This map is intended forCity display purposes only. Renton City Limits k Education Fire Station K Valley Medical Center Erosion Hazard Severity High Coordinate System: NAD 1983 HARN StatePlane Washington North FIPS 4601 FeetProjection: Lambert Conformal ConicDatum: North American 1983 HARN k k k k k k k k k k k k k k k k k k k k k k k k k k k kk k k k k k k k k k k k k k k k k k k k HoquiamAveNEE Valley Hwy84thAveSNEParkD r SW 7th St SE 128th St SE 192nd StLindAveSWMainAveSS 132nd St Factory PlN Talbot Rd SN 3rd St RainierAveS 164thAveSETukwila Pk w y SPuget Dr NE 4th St S 3rd St S 1 2 9 th S t68thAveSSWSunsetBlvd SW 16th St 116thAveSEN 4th St I n t e r u r b a n Av e S WilliamsAveNBronsonW a y N NE7thSt 124thAveSES 7th St SERenton IssaquahRd Rai ni er AveNNewcastle Way CoalCr e e k PkwySESW 41st St T a ylo r P l N WNESunsetBlvdWellsAveNUnionAveNEN E 3 rd S tHa r die A v eSWS180th St Maple Valley Hwy 140thAveSES G ra d yWayS 2 1 s tSt BensonRdSRe nt o n AveS87thAveS128thAveSE148thAveSESW 43rd St SEC arrR d SE 168th St Beaco n A v e S 68thAveSLoganAveN108thAveSEForestDr SE S2ndSt 141 s tAve S ERainierAveS 156thAveSES E 183rd StBenson Dr SS 124th StS 43rd St Airport Way S W G radyW a y S E J o n e s RdSunsetBlvdN Puget Dr SESE 204th W aySW 34th StMo n s ter RdSW S E 1 4 2 n d P lWestValleyHwySSEMay ValleyRd SunsetBlvdNS C a r r RdHouserWayNNewcastle GolfClubRd S 133rd St WilliamsAveSWellsAveSEMercerWay154thPlSEDuvallAveNELoganAveSMonroeAveNESunsetBlvdNEEdmondsAveNEStevens AveNWRai ni er AveSTalbotRdSOakesdaleAveSWTaylorAveNW164thAveSERainierAveSWestVal leyHwyWestValleyHwyParkAveN108thAveSE6 6 t h Av e SWMercerWayWMercer W ay LakemontBlvdSE132ndAve SELakeWashingtonBlvdNE140thWaySE East Valley Rd68thAveS³City of RentonSensitive Areas 0 0.5 10.25 Miles Information Technology - GISmapsupport@rentonwa.govPrinted on: 11/12/2014 Data Sources: City of Renton, King County This document is a graphic representation, not guaranteedto survey accuracy, and is based on the best informationavailable as of the date shown. This map is intended forCity display purposes only. Renton City Limits k Education Fire Station K Valley Medical Center Landslide HazardSeverityVery HighHighModerateUnclassified Coordinate System: NAD 1983 HARN StatePlane Washington North FIPS 4601 FeetProjection: Lambert Conformal ConicDatum: North American 1983 HARN k k k k k k k k k k k k k k k k k k k k k k k k k k k kk k k k k k k k k k k k k k k k k k k k HoquiamAveNEE Valley Hwy84thAveSNEParkD r SW 7th St SE 128th St SE 192nd StLindAveSWMainAveSS 132nd St Factory PlN Talbot Rd SN 3rd St RainierAveS 164thAveSETukwila Pk w y SPuget Dr NE 4th St S 3rd St S 1 2 9 th S t68thAveSSWSunsetBlvd SW 16th St 116thAveSEN 4th St I n t e r u r b a n Av e S WilliamsAveNBronsonW a y N NE7thSt 124thAveSES 7th St SERenton IssaquahRd Rai ni er AveNNewcastle Way CoalCr e e k PkwySESW 41st St T a ylo r P l N WNESunsetBlvdWellsAveNUnionAveNEN E 3 rd S tHa r die A v eSWS180th St Maple Valley Hwy 140thAveSES G ra d yWayS 2 1 s tSt BensonRdSRe nt o n AveS87thAveS128thAveSE148thAveSESW 43rd St SEC arrR d SE 168th St Beaco n A v e S 68thAveSLoganAveN108thAveSEForestDr SE S2ndSt 141 s tAve S ERainierAveS 156thAveSES E 183rd StBenson Dr SS 124th StS 43rd St Airport Way S W G radyW a y S E J o n e s RdSunsetBlvdN Puget Dr SESE 204th W aySW 34th StMo n s ter RdSW S E 1 4 2 n d P lWestValleyHwySSEMay ValleyRd SunsetBlvdNS C a r r RdHouserWayNNewcastle GolfClubRd S 133rd St WilliamsAveSWellsAveSEMercerWay154thPlSEDuvallAveNELoganAveSMonroeAveNESunsetBlvdNEEdmondsAveNEStevens AveNWRai ni er AveSTalbotRdSOakesdaleAveSWTaylorAveNW164thAveSERainierAveSWestVal leyHwyWestValleyHwyParkAveN108thAveSE6 6 t h Av e SWMercerWayWMercer W ay LakemontBlvdSE132ndAve SELakeWashingtonBlvdNE140thWaySE East Valley Rd68thAveS³City of RentonSensitive Areas 0 0.5 10.25 Miles Information Technology - GISmapsupport@rentonwa.govPrinted on: 11/12/2014 Data Sources: City of Renton, King County This document is a graphic representation, not guaranteedto survey accuracy, and is based on the best informationavailable as of the date shown. This map is intended forCity display purposes only. Renton City Limits k Education Fire Station K Valley Medical Center Steep Slopes Percent Range >15% & <=25% >25% & <=40% >40% & <=90% >90% Coordinate System: NAD 1983 HARN StatePlane Washington North FIPS 4601 FeetProjection: Lambert Conformal ConicDatum: North American 1983 HARN Core Design, Inc. WANG SHORT PLAT Page 31 Appendix C – Pond Sizing WWHM Pond Modeling Report WWHM2012 PROJECT REPORT 17150 Vault w LID 3/2/2018 4:24:28 PM Page 2 General Model Information Project Name:17150 Vault w LID Site Name:Wang SP Site Address: City:Renton Report Date:3/2/2018 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.00 Version:2015/06/05 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 17150 Vault w LID 3/2/2018 4:24:29 PM Page 3 Landuse Basin Data Predeveloped Land Use Predeveloped Bypass:No GroundWater:No Pervious Land Use Acres C, Forest, Mod 1.994 Pervious Total 1.994 Impervious Land Use Acres Impervious Total 0 Basin Total 1.994 Element Flows To: Surface Interflow Groundwater 17150 Vault w LID 3/2/2018 4:24:29 PM Page 4 Mitigated Land Use Developed Bypass:No GroundWater:No Pervious Land Use Acres C, Lawn, Mod 1.04 Pervious Total 1.04 Impervious Land Use Acres ROADS MOD 0.954 Impervious Total 0.954 Basin Total 1.994 Element Flows To: Surface Interflow Groundwater Vault 1 Vault 1 17150 Vault w LID 3/2/2018 4:24:29 PM Page 5 Routing Elements Predeveloped Routing 17150 Vault w LID 3/2/2018 4:24:29 PM Page 6 Mitigated Routing Vault 1 Width:41 ft. Length:113 ft. Depth:5.75 ft. Discharge Structure Riser Height:4.75 ft. Riser Diameter:12 in. Notch Type:Rectangular Notch Width:0.010 ft. Notch Height:1.100 ft. Orifice 1 Diameter:0.844 in.Elevation:0 ft. Orifice 2 Diameter:0.813 in.Elevation:2.55 ft. Orifice 3 Diameter:1 in.Elevation:3.1 ft. Element Flows To: Outlet 1 Outlet 2 Vault Hydraulic Table Stage(ft)Area(ac)Volume(ac-ft)Discharge(cfs)Infilt(cfs) 0.0000 0.106 0.000 0.000 0.000 0.0639 0.106 0.006 0.004 0.000 0.1278 0.106 0.013 0.006 0.000 0.1917 0.106 0.020 0.008 0.000 0.2556 0.106 0.027 0.009 0.000 0.3194 0.106 0.034 0.010 0.000 0.3833 0.106 0.040 0.012 0.000 0.4472 0.106 0.047 0.012 0.000 0.5111 0.106 0.054 0.013 0.000 0.5750 0.106 0.061 0.014 0.000 0.6389 0.106 0.068 0.015 0.000 0.7028 0.106 0.074 0.016 0.000 0.7667 0.106 0.081 0.016 0.000 0.8306 0.106 0.088 0.017 0.000 0.8944 0.106 0.095 0.018 0.000 0.9583 0.106 0.101 0.018 0.000 1.0222 0.106 0.108 0.019 0.000 1.0861 0.106 0.115 0.020 0.000 1.1500 0.106 0.122 0.020 0.000 1.2139 0.106 0.129 0.021 0.000 1.2778 0.106 0.135 0.021 0.000 1.3417 0.106 0.142 0.022 0.000 1.4056 0.106 0.149 0.022 0.000 1.4694 0.106 0.156 0.023 0.000 1.5333 0.106 0.163 0.023 0.000 1.5972 0.106 0.169 0.024 0.000 1.6611 0.106 0.176 0.024 0.000 1.7250 0.106 0.183 0.025 0.000 1.7889 0.106 0.190 0.025 0.000 1.8528 0.106 0.197 0.026 0.000 1.9167 0.106 0.203 0.026 0.000 1.9806 0.106 0.210 0.027 0.000 2.0444 0.106 0.217 0.027 0.000 2.1083 0.106 0.224 0.028 0.000 2.1722 0.106 0.231 0.028 0.000 17150 Vault w LID 3/2/2018 4:24:29 PM Page 7 2.2361 0.106 0.237 0.028 0.000 2.3000 0.106 0.244 0.029 0.000 2.3639 0.106 0.251 0.029 0.000 2.4278 0.106 0.258 0.030 0.000 2.4917 0.106 0.265 0.030 0.000 2.5556 0.106 0.271 0.032 0.000 2.6194 0.106 0.278 0.036 0.000 2.6833 0.106 0.285 0.038 0.000 2.7472 0.106 0.292 0.040 0.000 2.8111 0.106 0.299 0.041 0.000 2.8750 0.106 0.305 0.043 0.000 2.9389 0.106 0.312 0.044 0.000 3.0028 0.106 0.319 0.045 0.000 3.0667 0.106 0.326 0.046 0.000 3.1306 0.106 0.333 0.052 0.000 3.1944 0.106 0.339 0.057 0.000 3.2583 0.106 0.346 0.060 0.000 3.3222 0.106 0.353 0.063 0.000 3.3861 0.106 0.360 0.066 0.000 3.4500 0.106 0.366 0.069 0.000 3.5139 0.106 0.373 0.071 0.000 3.5778 0.106 0.380 0.073 0.000 3.6417 0.106 0.387 0.075 0.000 3.7056 0.106 0.394 0.078 0.000 3.7694 0.106 0.400 0.080 0.000 3.8333 0.106 0.407 0.083 0.000 3.8972 0.106 0.414 0.087 0.000 3.9611 0.106 0.421 0.090 0.000 4.0250 0.106 0.428 0.093 0.000 4.0889 0.106 0.434 0.097 0.000 4.1528 0.106 0.441 0.100 0.000 4.2167 0.106 0.448 0.104 0.000 4.2806 0.106 0.455 0.107 0.000 4.3444 0.106 0.462 0.111 0.000 4.4083 0.106 0.468 0.114 0.000 4.4722 0.106 0.475 0.118 0.000 4.5361 0.106 0.482 0.121 0.000 4.6000 0.106 0.489 0.125 0.000 4.6639 0.106 0.496 0.129 0.000 4.7278 0.106 0.502 0.132 0.000 4.7917 0.106 0.509 0.225 0.000 4.8556 0.106 0.516 0.497 0.000 4.9194 0.106 0.523 0.858 0.000 4.9833 0.106 0.530 1.254 0.000 5.0472 0.106 0.536 1.634 0.000 5.1111 0.106 0.543 1.952 0.000 5.1750 0.106 0.550 2.180 0.000 5.2389 0.106 0.557 2.326 0.000 5.3028 0.106 0.564 2.487 0.000 5.3667 0.106 0.570 2.619 0.000 5.4306 0.106 0.577 2.746 0.000 5.4944 0.106 0.584 2.866 0.000 5.5583 0.106 0.591 2.981 0.000 5.6222 0.106 0.598 3.092 0.000 5.6861 0.106 0.604 3.199 0.000 5.7500 0.106 0.611 3.303 0.000 5.8139 0.106 0.537 3.403 0.000 17150 Vault w LID 3/2/2018 4:24:29 PM Page 8 17150 Vault w LID 3/2/2018 4:24:29 PM Page 9 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.994 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:1.04 Total Impervious Area:0.954 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.06095 5 year 0.099872 10 year 0.124898 25 year 0.154667 50 year 0.175288 100 year 0.194548 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.03948 5 year 0.062272 10 year 0.081023 25 year 0.109392 50 year 0.134259 100 year 0.162626 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.070 0.026 1950 0.083 0.044 1951 0.133 0.107 1952 0.042 0.024 1953 0.034 0.029 1954 0.052 0.030 1955 0.083 0.030 1956 0.067 0.057 1957 0.054 0.030 1958 0.060 0.039 17150 Vault w LID 3/2/2018 4:25:34 PM Page 10 1959 0.051 0.027 1960 0.092 0.087 1961 0.051 0.044 1962 0.031 0.023 1963 0.043 0.031 1964 0.061 0.033 1965 0.041 0.053 1966 0.039 0.029 1967 0.094 0.038 1968 0.053 0.029 1969 0.051 0.028 1970 0.041 0.030 1971 0.046 0.036 1972 0.101 0.075 1973 0.045 0.046 1974 0.050 0.038 1975 0.069 0.028 1976 0.049 0.031 1977 0.007 0.023 1978 0.042 0.041 1979 0.025 0.022 1980 0.119 0.084 1981 0.037 0.030 1982 0.077 0.068 1983 0.066 0.037 1984 0.040 0.025 1985 0.024 0.026 1986 0.104 0.047 1987 0.092 0.075 1988 0.036 0.025 1989 0.024 0.025 1990 0.221 0.096 1991 0.117 0.080 1992 0.048 0.042 1993 0.047 0.025 1994 0.016 0.022 1995 0.067 0.042 1996 0.155 0.108 1997 0.119 0.100 1998 0.029 0.025 1999 0.131 0.076 2000 0.046 0.039 2001 0.008 0.020 2002 0.054 0.054 2003 0.080 0.028 2004 0.086 0.098 2005 0.064 0.032 2006 0.072 0.047 2007 0.167 0.147 2008 0.203 0.106 2009 0.095 0.057 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.2207 0.1471 2 0.2033 0.1082 3 0.1668 0.1073 17150 Vault w LID 3/2/2018 4:25:34 PM Page 11 4 0.1546 0.1060 5 0.1332 0.1004 6 0.1308 0.0976 7 0.1193 0.0961 8 0.1190 0.0872 9 0.1171 0.0842 10 0.1044 0.0801 11 0.1011 0.0762 12 0.0948 0.0750 13 0.0936 0.0748 14 0.0922 0.0679 15 0.0919 0.0568 16 0.0859 0.0566 17 0.0833 0.0544 18 0.0828 0.0530 19 0.0804 0.0475 20 0.0772 0.0473 21 0.0717 0.0459 22 0.0702 0.0437 23 0.0691 0.0436 24 0.0669 0.0421 25 0.0667 0.0421 26 0.0660 0.0412 27 0.0638 0.0389 28 0.0612 0.0386 29 0.0598 0.0379 30 0.0539 0.0376 31 0.0539 0.0366 32 0.0527 0.0365 33 0.0519 0.0335 34 0.0513 0.0321 35 0.0513 0.0315 36 0.0505 0.0308 37 0.0497 0.0305 38 0.0494 0.0302 39 0.0478 0.0299 40 0.0467 0.0298 41 0.0465 0.0296 42 0.0465 0.0292 43 0.0448 0.0290 44 0.0432 0.0286 45 0.0418 0.0284 46 0.0417 0.0282 47 0.0412 0.0280 48 0.0407 0.0266 49 0.0398 0.0264 50 0.0391 0.0258 51 0.0374 0.0254 52 0.0364 0.0251 53 0.0338 0.0250 54 0.0314 0.0250 55 0.0292 0.0249 56 0.0253 0.0237 57 0.0241 0.0230 58 0.0236 0.0229 59 0.0157 0.0222 60 0.0083 0.0215 61 0.0072 0.0197 17150 Vault w LID 3/2/2018 4:25:34 PM Page 12 17150 Vault w LID 3/2/2018 4:25:34 PM Page 13 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0305 17079 14780 86 Pass 0.0319 15490 12981 83 Pass 0.0334 14067 12038 85 Pass 0.0349 12797 11345 88 Pass 0.0363 11569 10718 92 Pass 0.0378 10519 9745 92 Pass 0.0393 9561 8819 92 Pass 0.0407 8750 7901 90 Pass 0.0422 8034 7005 87 Pass 0.0436 7347 6145 83 Pass 0.0451 6733 5215 77 Pass 0.0466 6190 4359 70 Pass 0.0480 5730 4028 70 Pass 0.0495 5309 3852 72 Pass 0.0510 4924 3722 75 Pass 0.0524 4569 3580 78 Pass 0.0539 4237 3420 80 Pass 0.0553 3951 3270 82 Pass 0.0568 3643 3155 86 Pass 0.0583 3388 3050 90 Pass 0.0597 3133 2917 93 Pass 0.0612 2915 2783 95 Pass 0.0627 2706 2631 97 Pass 0.0641 2490 2492 100 Pass 0.0656 2314 2346 101 Pass 0.0670 2136 2162 101 Pass 0.0685 1972 1997 101 Pass 0.0700 1824 1871 102 Pass 0.0714 1702 1751 102 Pass 0.0729 1577 1617 102 Pass 0.0744 1442 1433 99 Pass 0.0758 1325 1265 95 Pass 0.0773 1232 1175 95 Pass 0.0787 1147 1084 94 Pass 0.0802 1085 999 92 Pass 0.0817 1020 937 91 Pass 0.0831 947 872 92 Pass 0.0846 886 783 88 Pass 0.0861 824 717 87 Pass 0.0875 760 640 84 Pass 0.0890 725 597 82 Pass 0.0904 674 547 81 Pass 0.0919 623 504 80 Pass 0.0934 589 460 78 Pass 0.0948 549 422 76 Pass 0.0963 506 358 70 Pass 0.0978 469 296 63 Pass 0.0992 427 268 62 Pass 0.1007 389 241 61 Pass 0.1022 356 204 57 Pass 0.1036 328 180 54 Pass 0.1051 298 153 51 Pass 0.1065 270 128 47 Pass 17150 Vault w LID 3/2/2018 4:25:34 PM Page 14 0.1080 241 107 44 Pass 0.1095 219 95 43 Pass 0.1109 198 89 44 Pass 0.1124 176 84 47 Pass 0.1139 152 78 51 Pass 0.1153 130 70 53 Pass 0.1168 119 65 54 Pass 0.1182 104 60 57 Pass 0.1197 95 56 58 Pass 0.1212 84 52 61 Pass 0.1226 74 48 64 Pass 0.1241 69 44 63 Pass 0.1256 61 40 65 Pass 0.1270 53 36 67 Pass 0.1285 46 33 71 Pass 0.1299 39 26 66 Pass 0.1314 29 18 62 Pass 0.1329 25 12 48 Pass 0.1343 22 11 50 Pass 0.1358 20 10 50 Pass 0.1373 17 8 47 Pass 0.1387 14 7 50 Pass 0.1402 12 5 41 Pass 0.1416 8 4 50 Pass 0.1431 7 3 42 Pass 0.1446 7 2 28 Pass 0.1460 7 1 14 Pass 0.1475 6 0 0 Pass 0.1490 6 0 0 Pass 0.1504 6 0 0 Pass 0.1519 6 0 0 Pass 0.1533 6 0 0 Pass 0.1548 5 0 0 Pass 0.1563 5 0 0 Pass 0.1577 5 0 0 Pass 0.1592 5 0 0 Pass 0.1607 5 0 0 Pass 0.1621 5 0 0 Pass 0.1636 5 0 0 Pass 0.1650 4 0 0 Pass 0.1665 4 0 0 Pass 0.1680 3 0 0 Pass 0.1694 3 0 0 Pass 0.1709 3 0 0 Pass 0.1724 3 0 0 Pass 0.1738 3 0 0 Pass 0.1753 3 0 0 Pass 17150 Vault w LID 3/2/2018 4:25:34 PM Page 15 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0.1485 acre-feet On-line facility target flow:0.169 cfs. Adjusted for 15 min:0.169 cfs. Off-line facility target flow:0.0933 cfs. Adjusted for 15 min:0.0933 cfs. 17150 Vault w LID 3/2/2018 4:25:34 PM Page 16 LID Report 17150 Vault w LID 3/2/2018 4:25:58 PM Page 17 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 17150 Vault w LID 3/2/2018 4:25:58 PM Page 18 Appendix Predeveloped Schematic 17150 Vault w LID 3/2/2018 4:25:58 PM Page 19 Mitigated Schematic 17150 Vault w LID 3/2/2018 4:25:58 PM Page 20 Predeveloped UCI File 17150 Vault w LID 3/2/2018 4:25:58 PM Page 21 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 17150 Vault w LID.wdm MESSU 25 Mit17150 Vault w LID.MES 27 Mit17150 Vault w LID.L61 28 Mit17150 Vault w LID.L62 30 POC17150 Vault w LID1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 17 IMPLND 2 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Vault 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 17 C, Lawn, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 17 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 17150 Vault w LID 3/2/2018 4:25:58 PM Page 22 17 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 17 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 17 0 4.5 0.03 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 17 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 17 0.1 0.25 0.25 6 0.5 0.25 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 17 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 2 ROADS/MOD 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 2 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 2 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 2 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 2 400 0.05 0.1 0.08 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** 17150 Vault w LID 3/2/2018 4:25:58 PM Page 23 # - # ***PETMAX PETMIN 2 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 2 0 0 END IWAT-STATE1 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Developed*** PERLND 17 1.04 RCHRES 1 2 PERLND 17 1.04 RCHRES 1 3 IMPLND 2 0.954 RCHRES 1 5 ******Routing****** PERLND 17 1.04 COPY 1 12 IMPLND 2 0.954 COPY 1 15 PERLND 17 1.04 COPY 1 13 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Vault 1 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 17150 Vault w LID 3/2/2018 4:25:59 PM Page 24 1 1 0.02 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.106359 0.000000 0.000000 0.063889 0.106359 0.006795 0.004886 0.127778 0.106359 0.013590 0.006910 0.191667 0.106359 0.020385 0.008463 0.255556 0.106359 0.027181 0.009772 0.319444 0.106359 0.033976 0.010925 0.383333 0.106359 0.040771 0.011968 0.447222 0.106359 0.047566 0.012927 0.511111 0.106359 0.054361 0.013820 0.575000 0.106359 0.061156 0.014658 0.638889 0.106359 0.067952 0.015451 0.702778 0.106359 0.074747 0.016205 0.766667 0.106359 0.081542 0.016926 0.830556 0.106359 0.088337 0.017617 0.894444 0.106359 0.095132 0.018282 0.958333 0.106359 0.101927 0.018924 1.022222 0.106359 0.108723 0.019544 1.086111 0.106359 0.115518 0.020146 1.150000 0.106359 0.122313 0.020730 1.213889 0.106359 0.129108 0.021298 1.277778 0.106359 0.135903 0.021851 1.341667 0.106359 0.142698 0.022391 1.405556 0.106359 0.149494 0.022918 1.469444 0.106359 0.156289 0.023433 1.533333 0.106359 0.163084 0.023937 1.597222 0.106359 0.169879 0.024430 1.661111 0.106359 0.176674 0.024914 1.725000 0.106359 0.183469 0.025389 1.788889 0.106359 0.190265 0.025854 1.852778 0.106359 0.197060 0.026312 1.916667 0.106359 0.203855 0.026762 1.980556 0.106359 0.210650 0.027204 2.044444 0.106359 0.217445 0.027640 2.108333 0.106359 0.224240 0.028068 2.172222 0.106359 0.231035 0.028490 2.236111 0.106359 0.237831 0.028906 2.300000 0.106359 0.244626 0.029316 2.363889 0.106359 0.251421 0.029721 2.427778 0.106359 0.258216 0.030120 2.491667 0.106359 0.265011 0.030513 2.555556 0.106359 0.271806 0.032239 2.619444 0.106359 0.278602 0.036013 2.683333 0.106359 0.285397 0.038215 2.747222 0.106359 0.292192 0.040005 2.811111 0.106359 0.298987 0.041576 2.875000 0.106359 0.305782 0.043002 2.938889 0.106359 0.312577 0.044324 3.002778 0.106359 0.319373 0.045566 3.066667 0.106359 0.326168 0.046744 3.130556 0.106359 0.332963 0.052612 3.194444 0.106359 0.339758 0.057288 3.258333 0.106359 0.346553 0.060787 17150 Vault w LID 3/2/2018 4:25:59 PM Page 25 3.322222 0.106359 0.353348 0.063788 3.386111 0.106359 0.360144 0.066487 3.450000 0.106359 0.366939 0.068975 3.513889 0.106359 0.373734 0.071304 3.577778 0.106359 0.380529 0.073505 3.641667 0.106359 0.387324 0.075602 3.705556 0.106359 0.394119 0.078041 3.769444 0.106359 0.400915 0.080882 3.833333 0.106359 0.407710 0.083923 3.897222 0.106359 0.414505 0.087101 3.961111 0.106359 0.421300 0.090380 4.025000 0.106359 0.428095 0.093738 4.088889 0.106359 0.434890 0.097157 4.152778 0.106359 0.441685 0.100622 4.216667 0.106359 0.448481 0.104121 4.280556 0.106359 0.455276 0.107646 4.344444 0.106359 0.462071 0.111185 4.408333 0.106359 0.468866 0.114733 4.472222 0.106359 0.475661 0.118281 4.536111 0.106359 0.482456 0.121822 4.600000 0.106359 0.489252 0.125352 4.663889 0.106359 0.496047 0.128958 4.727778 0.106359 0.502842 0.132931 4.791667 0.106359 0.509637 0.225366 4.855556 0.106359 0.516432 0.497873 4.919444 0.106359 0.523227 0.857975 4.983333 0.106359 0.530023 1.254142 5.047222 0.106359 0.536818 1.634680 5.111111 0.106359 0.543613 1.952709 5.175000 0.106359 0.550408 2.180151 5.238889 0.106359 0.557203 2.326480 5.302778 0.106359 0.563998 2.487003 5.366667 0.106359 0.570794 2.619820 5.430556 0.106359 0.577589 2.745963 5.494444 0.106359 0.584384 2.866353 5.558333 0.106359 0.591179 2.981716 5.622222 0.106359 0.597974 3.092634 5.686111 0.106359 0.604769 3.199589 5.750000 0.106359 0.611565 3.302979 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 2 PERLND PWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 2 MASS-LINK 3 PERLND PWATER IFWO 0.083333 RCHRES INFLOW IVOL 17150 Vault w LID 3/2/2018 4:25:59 PM Page 26 END MASS-LINK 3 MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 17150 Vault w LID 3/2/2018 4:25:59 PM Page 27 Predeveloped HSPF Message File 17150 Vault w LID 3/2/2018 4:25:59 PM Page 28 Mitigated HSPF Message File 17150 Vault w LID 3/2/2018 4:25:59 PM Page 29 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2018; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com