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HomeMy WebLinkAboutLUA00-159 k ' CITY'OF RENTON CERTIFICATE'OF'-EXEMPTIO:N FROM SHORELINE SUBSTANTIAL;DEVELOPMENT PERMIT December 8, 2000 EXEMPTION FILE NO.: LUA-00-159, SME PROJECT NAME: Boeing Towpath Replacement. APPLICANT: Boeing Company OWNER: Boeing Company PROJECT MANAGER: Jason E. Jordan, 425 430-7289 PROPOSAL: Replace concrete towpath over Lake Washington, which Boeing uses to move airplanes from the production side of the facility to the airfield side. PROJECT LOCATION: Renton Boeing plant facility near Lake Washington. LEGAL DESCRIPTION: N/A SEC-TWN-R: 22-23-05E WATER BODY/WETLAND: Lake Washington An exemption from a Shoreline Management Substantial Development Permit is hereby granted on the proposed project described on the attached form for the following reason(s): XX Emergency construction necessary to protect property from damage by the elements. 1. An "emergency" is an unanticipated and imminent threat to public health, safety, or the environment which requires immediate action within a time too short to allow for full compliance with this Program. 2. Emergency construction does not include development of new permanent protective structures where none previously existed. Where new protective structures are deemed to be the appropriate means to address the emergency situation, upon abatement of the emergency situation, the new structure shall be removed or any permit which would have been required, absent an emergency, pursuant to chapter 90.58 RCW, chapter 17-27 WAC or this Shoreline Program shall be obtained. 3. All emergency construction shall be consistent with the policies of chapter 90.58 RCW and this Program. 4. In general, flooding or other seasonal events that can be anticipated and may occur, but that are not imminent are not an emergency. The proposed development is consistent or inconsistent with (check one): Boeing shorelinemaster doc.dot • CONSISTENT INCONSISTENT. • XX Policies of the Shoreline Management Act. XX The guidelines of the Department of Ecology where no Master Program has been finally approved or adapted by the Department. . XX The Master Program. CONDITION(S) OF APPROVAL: 1. The applicant shall complete the towpath replacement project within six (6) months from the date of this permit. If the work cannot be completed within a six month timeframe, then the project will not be considered an emergency and the applicant shall be required to obtain a City of Renton Shoreline Substantial Development Permit. Neil Watts, Director Development Services Division Attachments: Utility Systems Division Memo Development Services Memo • Boeing shorelinemaster doc.dot „ °. CITY iF RENTON Planning/Building/Public Works Department Jesse Tanner,Mayor Gregg Zimmerman P.E.,Administrator December 8, 2000 Mr. Rick Ford The Boeing Company P.O.Box 3707 Seattle,WA 98124-2207 SUBJECT: REQUEST FOR EMERGENCY SEPA& SHORELINE EXEMPTION FOR BOEING RENTON SITE TOWPATH Dear.Mr. Ford: I am in receipt of your letter of November 27,2000 and the attached technical memorandum from Tetra Tech/KCM. As evidenced from your letter and a site visit conducted by staff on November 23rd,I understand that the water action from Lake Washington has eroded an area under the concrete towpath used for moving aircraft from the plant site of the facility to the field side. Continued cracking and settlement will affect Boeing's ability to move aircraft from the manufacturing line to the field. This inability to move aircraft to the field, could compromise plant production. According to Tetra Tech/KCM, Inc. the lack of adequate pavement support may currently extend into the existing airplane towpath. Tetra Tech/KCM has recommended repair of the bulkhead lagging,backfilling of the void,and replacement of the concrete pavement such that vehicle and plane traffic can be adequately supported. This process can be accomplished in stages with backfilling and temporary steel plates used to cover affected areas as needed. The need for the work is immediate, and coincides with the lake level approaching its lowest annual level at the end of December, which is ideal with regard to potential dewatering problems. Proposals within 200 feet of the Ordinary High Water Mark of Lake Washington require a Shoreline Substantial Development Permit and SEPA environmental review. However,Renton Municipal Code provides for exemptions from Shoreline permitting for "Emergency construction necessary to protect property from damage by the elements.” According to RMC 4-9-190C.5: a. An "emergency"is an unanticipated and imminent threat to public health, safety, or the environment which requires immediate action within a time too short to allow for full compliance with the program. b. Emergency construction does not include development of new permanent protective structures where none previously existed. Whenever new protective structures are deemed to be appropriate means to address the emergency situation, upon abatement of the emergency situation, the new structure shall be removed or any permit which would have been required, absent an emergency,pursuant to chapter 90.58 RCW, chapter 17-27 WAC or this Shoreline Program shall be obtained. c. All emergency construction shall be consistent with the policies of chapter 90.58 RCW and this Program. 1-1.UI1VISIl1N c\1WVF!nP SFR\DFVRrPI AN iNGUTH\hoeing'tow bridge dnc\car 1055 South Grady Way-Renton,Washington 98055 • d. In general,flooding or other seasonal events that can be anticipated and may occur, but that are not imminent are not an emergency. Furthermore,RMC Section 4-9-190C3 exempts projects from Shoreline regulations for normal maintenance or repair of existing structures or developments, including damage by accident, fire or elements. The repair of the Boeing towbridge is needed to avoid imminent threat to public safety and the environment. For this reason,the towbridge repair is exempt from regulation under the City's Shoreline Master Program. However, should the structure remain beyond 6 months time from the date of installation, application for a Shoreline Substantial Development Permit will be required. A copy of the Shoreline Exemption is attached to this memo. Washington Administrative Code Section 197-11-880, specifies instances when projects are considered to be an emergency and are exempt from SEPA environmental review. `Actions that must be undertaken immediately or within a time too short to allow full compliance with this chapter, to avoid an imminent threat to public health or safety, to prevent an imminent danger to public or private property, or to prevent an imminent threat of serious environmental degradation, shall be exempt. " Based on the information provided to me via your letter of November 27 2000, it is clear that an imminent threat to public safety and private property is present. Therefore,the repair of the Boeing towbridge is exempt from requirements of SEPA environmental review. This exemption applies only to City of Renton environmental and Shoreline permit processes. I understand that you will coordinate separately with state and federal agencies with jurisdiction regarding the necessity for permits or exemptions from permits. Should you have any questions regarding this correspondence,please contact Jennifer Toth Henning at(425)430-7286. Sincerely, ljtj tUaA Neil Watts Development Services Director cc: Gregg Zimmerman Ron Straka Jennifer Henning Jason Jordan attachment: Shoreline Exemption H:\DIVISION.S\DEVELOP.SER\DEV&PLAN.INGUTH\boeing tow bridge.doc\cor The Boeing Company P.O.Box 3707 _ Seattle,WA 98124-2207 November 27, 2000 Neil Watts Director of Development Services City of Renton 1055 South Grady Way Renton,Washington 98055 le)t— Subject: Request for Emergency SEPA and Shoreline Exemption Boeing Renton Site Towpath, Renton,WA BAG Attachment: Technical Memo, dated November 17, 2000 to Mehdi Nakhjiri, with The Boeing Co. from Douglas Wright with Tetra Tech/KCM, Inc. Dear Mr. Watts: The purpose of this letter is to request a waiver from The City of Renton on SEPA and Shoreline permit requirements in order to allow Boeing to correct an unsafe situation on our concrete tow path as witnessed by Greg Zimmerman and Jennifer Henning/Toth on Wednesday,November 22, 2000. We believe that the situation falls under the"Emergencies" section of WAC 197-11-880, due to the threat of serious private property damage. In short, the water action from Lake Washington has eroded an area under the concrete towpath we use for moving aircraft from the plant side of the facility to the field side. (Please see the attached memo for a more complete description of the situation,proposed solution and drawings) If the concrete slabs that cover the area in question continues to settle or crack we will be in jeopardy of losing the ability to move aircraft to the field, thereby ceasing production at the plant. At present we are at a 24 a month production rate. We are proceeding with planning on the emergency construction project and hope to have the actual job complete by the first of January. The planning includes working with Washington Department of Fish and Wildlife and the US Corps of Engineers. If I can provide additional information please do not hesitate to call me. Sincerely Aaf Rick Ford Planning and Land Use 425 237-2336 ENVIRONMENTAL CHECKLIST A. BACKGROUND 1. Name of proposed project, if applicable: Emergency Tow Path Repair 2. Name of applicant The Boeing Company P.O. Box 3707, M/S 63-02 Seattle, WA 98124-2207 3. Address and phone number of applicant and contact person: Rick Ford Facilities The Boeing Company P.O. Box 3707, M/S 63-02 Seattle, WA 98124-2207 4. Date checklist prepared: December, 2000 5. Agency requesting checklist: City of Renton 6. Proposed timing or schedule (including phasing, if applicable): Construction Repair: Winter 2000 and 2001 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No. 6. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. None. ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 1 12/08/00 i Js 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. No. 10. List any government approvals or permits that will be needed for your proposal, if known. Federal: ,? None State of Washington: None King County: None City of Renton/Local: State Environmental Policy Act Review 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) The project site is located adjacent to Lake Washington northeast of Building 4- 41 at the Boeing Renton Plant. Within the last couple of weeks, Boeing staff have noticed that a concrete pavement patch has increased its rate of settlement in the vicinity of the airplane towpath and nearby bulkhead located under the existing dock on Lake Washington. Observing the underside of the dock or bulkhead area revealed a sizable void under the pavement that extended about 14 feet behind the bulkhead. The extent of the void to the south (parallel to the bulkhead) towards the airplane towpath is not visible, however the void size (where portions of the bulkhead lagging were missing) indicated the void might extend all the way to the centerline of the airplane towpath. See Exhibit"C" Tetra Tech, Technical Memo for details and location drawings. The settlement of the trench patch and the adjacent concrete slab are the result of the bulkhead backfill migrating through openings in the bulkhead (missing lagging) and creating a void space under the adjacent pavement. Observations taken of asphalt pavement overlays in the trench patch area, and conversations with Boeing personnel reveal that some settlement has been occurring over many months but the majority of the settlement has occurred the last couple of weeks. Lake Washington water level varies through out the year by about two feet. The lowest lake level is near the end of December with the highest level at the end of April. The lowering of the lake level this fall probably has contributed to increased migration of the bulkhead backfill. At the time of observation, the lake ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 2 12/08/00 I level was a few inches below the bottom of the hole created by the missing lagging. The repair project will entail repairing the bulkhead lagging, backfilling the void, and replacing the concrete pavement to provide a stable pavement suitable for airplane and vehicular traffic via the following anticipated construction process: 1. The process should start by removing the concrete pad poured at the back of the bulkhead just north of the dock area. 2. The 13-foot concrete pavement strip just west of the bulkhead will be removed beginning at the north end heading south. The slab needs to be removed to the point where it bears directly on the existing ground and the adjacent bulkhead lagging is in good condition. It is anticipated that a section of pavement approximately 70 feet long by 13 feet wide will be removed. Relocation of an existing fire water line to the west may also be undertaken at this time, if the waterline is found to interfere with the bulkhead anchor piles. 3. The utility braces will be evaluated by an engineer for soundness and continuity. It is not know if construction of the adjacent utilities damaged the wood braces. Damaged and rotted braces will be replaced. 4. The bulkhead backfill needs to be potholed (on the land side of the bulkhead) to determine if there are gaps in the lagging a couple of feet below the lake water line. If the lagging has gaps below the lake water line, it is recommended that 1" thick weathering steel plates be carefully pushed down on the land side of the bulkhead to approximately 2 feet below the lake side ground line. 5. The lagging above the lake water line will be replaced or adjusted such that gaps between lagging is less that 1/4" and the lagging is securely attached to the piles. The land side of the bulkhead will have 3/4" pressure treated plywood completely wrapped (front and back) in geotextile then nailed to the lagging to close off all gaps through the bulkhead. 6. The wood cap beam on top of the bulkhead piles will be evaluated by an engineer for structural integrity and replaced as needed. 7. The void behind the bulkhead will be backfilled with compacted granular material (relatively well-graded sand and gravel) to the bottom of the adjacent concrete pavement and top of the bulkhead cap beam. During the backfill operation, several geotextile reinforced gravel dams be constructed perpendicular to the bulkhead. These will minimize the exposure of undermined pavement should a section of the bulkhead fail in the future. Currently the void can travel a great distance parallel to the bulkhead from one breach in the lagging. 8. The replacement pavement will be reinforced concrete designed by for the anticipated vehicular and airplane loads. With the lake level reaching its lowest annual level at the end of December the repair work should take place immediately. ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 3 12/08/00 The only work anticipated on the lake side of the bulkhead will be construction workers crawling under the dock to assist with replacement of the lagging. No material is anticipated to be placed in the lake on the lake side of the bulkhead. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area,provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. Site address: 800 Park Avenue North Renton, Washington Refer to Exhibit A, Location in Region, Vicinity Map; and Site Plan for exact location. Refer to Exhibit B for Legal Description B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other Flat b. What is the steepest slope on the site(approximate percent slope)? 1% c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. The site is paved with cement concrete pavement, which is underlain by sand and gravel to a depth of several feet. Record drawings indicate dredge fill material comprises the next lower strata. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. The pavement settlement that exists in the project area appears to be due to failure of the bulkhead lagging allowing soil erosion. There have been problems in the past with soil settlement due to vibration from heavy construction activities driving sheet piling. This project will not employ high vibration construction techniques. ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 4 12/08/00 e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Filling will be limited to replacing the granular back fill behind the existing bulkhead. It is expected that 25 cubic yards of pavement will be removed and replaced. The void under the pavement may require approximately 70 cubic yards of gravel backfill. Some of this fill will be to replace existing bulkhead backfill removed to repair the lagging. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Since the excavation will be through a paved area, adjacent areas will remain undisturbed by the construction activities. The excavation area is surrounded by existing concrete pavement. The potential for sediment transport to surface waters will most likely occur during the movement of soil from the excavation hole to trucks for disposal. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The site is currently a 100% impervious, paved surface and, will continue to be impervious when the project is complete. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: Appropriate measures, such as silt fences and hay bale filters, will be used to control erosion during construction. Construction activities will minimize spillage of soil on the existing pavement adjacent to the pavement removal area. Catch basin BMP's will be employed for those in the vicinity of the project that receives surface water from the construction area. 2. Air a. What types of emissions to the air would result from the proposal(i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. During construction, vehicle and construction equipment emissions and dust will be released. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. No ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 5 12/08/00 c. Proposed measures to reduce or control emissions or other impacts to air, if any: Mitigation measures to reduce emissions include ensuring that machines and equipment used during construction are well maintained. 3. Water a. Surface: 1)Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. The bulkhead is adjacent to Lake Washington and approximately 500 feet east of the mouth of the Cedar River. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Yes. The only work anticipated on the lake side of the bulkhead will be construction workers crawling under the dock to assist with replacement of the lagging. No material is anticipated to be placed in the lake on the lake side of the bulkhead. On the land side of the bulkhead, the work will be limited to a narrow strip of land adjacent to the bulkhead. This will be the pavement removal, excavation to repair the lagging, lagging repair, gravel backfill, and concrete pavement replacement. 3)Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected Indicate the source of fill material. None 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No 5)Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 6 12/08/00 The project lies within Zone A on the FEMA Flood Insurance Rate Map. The base flood elevation has not been determined for this area. The paved area behind the bulkhead is a couple of feet above the normal high water elevation for the lake based on Corps of Engineer's controls. 6)Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximate quantities if known. No 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any(for example: Domestic sewage; industrial, containing the following chemicals. . . ;agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served(if applicable), or the number of animals or humans the system(s)are expected to serve. None c. Water runoff(including storm-water): 1) Describe the source of runoff(including storm water)and method of collection and disposal, if any(include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Storm water runoff will be collected in the existing plant's storm-water control system. No additional impervious surface or runoff will be created by the project. 2) Could waste materials enter ground or surface waters? If so, generally describe. No d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any: Utilize existing on-site storm water system to mitigate potential runoff water impacts. Appropriate mitigation measures will be initiated during demolition and construction to reduce and control surface water runoff impacts. ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 7 12/08/00 4. Plants a. Check or circle types of vegetation found on the site: deciduous tree: alder, maple, aspen, other evergreen tree: fir, cedar, pine, other shrubs, grass,pasture, crop or grain, wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil other types of vegetation None b. What kind and amount of vegetation will be removed or altered? None c. List threatened or endangered species known to be on or near the site. None d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: NA 5. Animals a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: Birds and animals which have been observed on or near the site are listed below: birds: seagulls, crows mammals: none observed fish: Chinook salmon, trout, b. List any threatened or endangered species known to be on or near the site. None c. Is the site part of a migration route? If so, explain. Pacific Flyway d. Proposed measures to preserve or enhance wildlife, if any: ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 8 12/08/00 Utilize temporary erosion, long term storm water and hazardous materials control systems and best management practices to prevent contaminated discharges. 6. Energy and natural resources a. What kinds of energy(electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs?Describe whether it will be used for heating, manufacturing, etc. None. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: None 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. Usual oils, greases, fuel and solvents will be present during construction. 1)Describe special emergency services that might be required. No special emergency services will be required. The hazardous materials involved are commonly used and are reasonably expected to be within the capability of existing emergency service operations. 2) Proposed measures to reduce or control environmental health hazards, if any: None b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? None ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 9 12/08/00 2) What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis(for example: traffic, construction, operation, other)?Indicate what hours noise would come from the site. Temporary noise impacts during demolition are anticipated. Construction projects of this type typically produce noise levels that range from 68 to 98 dba at 50 feet from the specific equipment. 3) Proposed measures to reduce or control noise impacts, if any: None. 8. Land and shoreline use a. What is the current use of the site and adjacent properties? The site is fully developed as an aircraft manufacturing and final assembly facility. b. Has the site been used for agriculture? If so, describe. Not for more than 50 years. c. Describe any structures on the site. The Renton Plant is a large airplane manufacturing and final assembly facility, consisting of many buildings and ancillary uses. The project site is within the Renton Plant. d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? Heavy Industrial f. What is the current comprehensive plan designation of the site? Industrial Employment g. If applicable, what is the current shoreline master program designation of the site? ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 10 12/08/00 Urban Environment h. Has any part of the site been classified as an "environmentally sensitive"area? If so, specify. Designated Shoreline Area L Approximately how many people would reside or work in the completed project? None j. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: None I. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: Compliance with city code. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. None b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. None c. Proposed measures to reduce or control housing impacts, if any: None 10.Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s)proposed? ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 11 12/08/00 N/A b. What views in the immediate vicinity would be altered or obstructed? None c. Proposed measures to reduce or control aesthetic impacts, if any: None 11. Light and glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? None b. Could light or glare from the finished project be a safety hazard or interfere with views? No c. What existing off-site sources of light or glare may affect your proposal? None anticipated. d. Proposed measures to reduce or control light and glare impacts, if any: None 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? The Cedar River shoreline trail, park and boathouse are within the general area. b. Would the proposed project displace any existing recreational uses? If so, describe. No c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: None ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 12 12/08/00 13. Historic and Cultural Preservation a. Are there any places or objects listed on, or proposed for, national, state, or local preservation registers known to be on or next to the site? If so, generally describe. No b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None have been identified on the project site. c. Proposed measures to reduce or control impacts, if any: Although previous excavation has disclosed no indications of archaeological significance, if artifacts are uncovered, work in that area will be halted pending notification and response from appropriate agencies. 14.Transportation a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. The site has access to North 8th Street, Park Avenue, Garden Avenue and Logan Avenue. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Yes. c. How many parking spaces would the completed project have? How many would the project eliminate? None. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). No ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 13 12/08/00 r' e. Will the project use(or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. No f. How many vehicular trips per day would be generated by the completed project?If known, indicate when peak volumes would occur. None g. Proposed measures to reduce or control transportation impacts, if any: None. 15. Public Services a. Would the project result in an increased need for public services(for example: fire protection,police protection, health care, schools, other)? If so, generally describe. None is anticipated. b. Proposed measures to reduce or control direct impacts on public services, if any. None 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. Electricity, natural gas, domestic water, refuse service, telephone, sanitary sewer and storm sewerage are currently available. b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. None ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 14 12/08/00 C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agenc is relying on them to ake its decision. Signature: / Richard J. Ford Date Submitted: ENVIRONMENTAL CHECKLIST Emergency Tow Path Repair 15 12/08/00 • - . . . ' . I . . LAKE z , WASHINGTON Project GO f••: Site 0 i , , • .,. •Z'1 i 1,,,,,, / . . . .,. , . . 4-/ , ..,0- •;,,,) BOAT J. ." -,.0- -.•• f .-.3, 4-82 ''.------------"--------------- . .. .... - . :7 ,,' ‘ N •"-.e-' . del %''• r-/3 . • ,A0•1••- 1. O4— . . 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E 4i , . ,/ z, 7 , . — • . . c0• .:_,.___ 7-: \.; : . _ .....__.. ._‘ . ... .. 1 - •. •-•„• .... _.. _ . . . . ... 1 . N.2ND ST ; •41 ; AIRPORT WAY ,. 1 o ; z • i • , , ;:r • ; 1 ,Iii I TetraKCM,Tech/Inc. Boeing Commercial Airplane Group Figure 1. * 1917 First Avenue BULKHEAD INVESTIGATION PROJECT VICINITY i Seattle, Washington 98101 .i4 i it. 6:;i g4,,, „ tii-:,-A:-.ci ,:,,,,--_ i • . : . -- ' 1 0.1' 2.6' : Deck Slab Patch Pavement „• ., • ; . . 4"x12" ___---- ------- Creosote Void Old Patch - ' ' ' • '7- I N Winter Low Lake V Level Pressure Treated _ 4"x12" Plank 2 -4"x12"Wood Brace - - Missing Lagging (2 Bays) Yt= . _ ' v •'Ii': -]1"x4"Battens 4"x12" Old Seaplane Ramp '''''''' 4,%• ''''..- g:. al Plank Elev. 15' _ Dredge Fill Piles --------------- a\s\oce NO cn b_ci br_ cp. 0 to c co < a 14.0' c 8 co ,-:-. , Tetra Tech/ 1917 FirsKtCAMv'eninuce ulik[ Boeing Commercial Airplane Group BULKHEAD INVESTIGATION Figure 3. SECTION A-A; EXISTING STRUCTURE Seattle, Washington 98101 Remove Bulkhead Backfill; Repair Lagging; Backfill N " ���•.. Lake ���� Washington CC7r;�!1 ' 94 ty\• ; •. i � �� ' Filter •Fabric o 20 _ • Erosion-Control Dam APProx.Scale in Feet CO ��::�.; (Typ. 3 Places) cn ;1, • b s . o _ ►♦♦♦/ is lo Old°° • ° . °,' •<, Concrete e,••o•. : ° e' c p • °A•''•°''Dock A 'trh'°<° 'J • A • ° A q 'AA i' ACUt' ` • • °A q''•e'• • •Xke �° A• a A n • °Aa V°A .^•' °Ae A°.' �•.I`4k ; ''• ° q • • °q• °°Concrete,'°° ° CI,°° °°q°•• Aq °A ,}�• iSJ4S.+I' • 0, • °Concrete°. i, Pavement° • °N ° ' •-.y,•'y , { . SF� Y 4 r .14 Ramp, • A•e ° °Aq ' °A LU •' •s kx rht„i ,yrx ��+ry� ��1t FRS, ? Aq '• ° e < • • A •y`4.as •t •1. 3� • a •• • A e A •• " • •, aa' y> :. t •M ° e i •. • < m'� «' ^ ':• • e ° • A • ° . Fire. • } ! L .. t }t+ � `' A ° , ° A a ° Q ° �, • t • e n l:x 1 , °° °. • • A •Hydran °, ! * , 4i • ° ° ' ,Manhole ° ' A` ;_ ' ' , ° ° ',I • • A e • ®Water Tow Path Valve 44 0 0 N Tetra Tech/ BoeingCommercial Airplane GroupFigure 4. KCM, Inc. p g d 1917 First Avenue BULKHEAD INVESTIGATION PROPOSED SITE PLAN lj Seattle, Washington 98101 ,° mo Tetra Tech/KCM Inc. 1 Technical Me , Date: November 17, 2000 To: Mehdi Nakhjiri, P.E., Principal Engineer Civil/Structural Group Boeing Facilities Services, Shared Services Group Renton District c Central Files From: Douglas Wright, P.E., Chief Civil Engineer Analysis Tex Druebert, P.E. [Shannon and Wilson, Inc.],Doug Payne [Tt/KCM], Team • Project No.: 2040007-200 Subject: Lake Washington Bulkhead/Pavement Evaluation-Boeing Renton Plant CAUTIONARY NOTE: The results of the following bulkhead and pavement evaluation have revealed that lack of adequate pavement support may extend into the existing airplane towpath (further south than the existing temporary steel plates). Where this void exists, the pavement in all probability will not safely support airplane wheel loads. 1.0 BACKGROUND } The project site is located northeast of Building 4-41 at the Boeing Renton Plant as shown in Figure 1. Within the last couple of weeks, Boeing staff have notice that a concrete pavement patch has increased its rate of settlement in the vicinity of the airplane towpath and nearby bulkhead located under the existing dock as shown on Figure 2. Boeing contacted Tt/KCM on November 10, 2000 with a request to visit the site and evaluate the need for emergency repairs to maintain the airplane towpath. The site visit involved review of the surface settlement and wading into the lake at the north end of the bulkhead to observe and probe the void behind the bulkhead. Observing the underside of the dock revealed a sizable void under the pavement that extended about 14 feet behind the bulkhead (a couple of feet west of the utility trench patch). The extent of the void to the south (parallel to the bulkhead) towards the airplane towpath was not visible, however the void size (where portions of the bulkhead lagging were missing) indicated the void might extend all the way to the airplane towpath paint line. At first it was thought the void may have been created by a broken waterline, however subsequent conversations with Boeing staff about automatic fire line leak detection, lack of flowing water in the void, and missing lagging indicated that was not a probable cause. Tt/KCM Engineers recommended that a portion of the utility trench be covered with steel plates commonly used to temporarily plate over utility trenches for vehicular access. Tetra Tecb/KCM,Inc. •1917 First Avenue•Seattle,WA 98101-1027.•.;Tel 206 443-5300•Fax 206 443-5372 I:\0-2900000\2040007\Task 200-Pier Repair Study\REPORTS\Techmemo v2.doc 1� „ 1' Lake Washington Bulkhead/Pavement Evaulation-Boeing Renton Plant a Boeing undertook to have this done immediately and also route planes as far south of the area as possible. 2.0 SITE ASSESSMENT On November 14, 2000, Tt/KCM scheduled a site visit with two engineers from Tt/KCM, one from Shannon and Wilson, and underwater divers to further observe and evaluate the condition of the bulkhead/backfill and confirm key surface features. 2.1 Surface Features Key surface features were located with cloth tape measurements to confirm and supplement the existing site plan provided by Boeing. These features are shown on Figure . 2. One feature that is not clearly evident from site observations but shown on as-built drawings is the entire dock area is constructed on a wood structure supported on top of the old concrete float plane ramp. The float plane ramp appears to be timber pile supported as shown in Figure 3. - 2.1 Below Deck Evaluation Underwater divers from Ballard Diving and Salvage, Inc. went under the dock with lights and a video camera to document the condition of the bulkhead/backfill and allow Tt/KCM and Shannon and Wilson Engineers the opportunity to more closely observe specific problem areas. The following are key observations noted during the diving observation (some are highlighted on Figure 3 that is a section view of the bulkhead): A. The first two bays under the north edge of the deck have wood lagging that is missing in the top two feet of the wall. B. In most of the bulkhead bays (between piles) that were accessible/visible (60± feet south of the north edge of the dock) had misaligned lagging. Gaps in the lagging 9 were either voids or filled with gravel., The further south along the bulkhead, the J higher the riprap extended to a point where no lagging was visible. C. The timber bulkhead piles appear to be in good condition. 1 4i D. There are sections of the cap beam on top of the bulkhead that appear to be shimmed on top of the braces rather than at the desired location of the pile tops. This will need to be further evaluated when the concrete pavement adjacent to the bulkhead is removed. E. At the north end of the bulkhead(out from under the dock), there is a slab of concrete about 5 to 6 feet in size that is completely undermined with only minimal support. While maneuvering under the dock, the divers conducted a cursory condition survey of the existing timber piles that support the main deck. The piles (above the old float plane ramp) appear to be in good condition. What appeared to be the old formwork for the concrete deck has fallen into the water in places with some of the formwork still attached to the underside Iof the deck This is contributing to a debris buildup under the dock. - ' Page 2 _ . I ' 1 Lake Washington Bulkhead/Pavement Evaulation-Boeing Renton Plant J 3.0 PREDESIGN EVALUATION The results of the site observations and discussions with Boeing staff indicate that the settlement of the trench patch and the adjacent concrete slab are the result of the bulkhead backfill migrating through openings in the bulkhead and creating a void space. It also appears from a series of asphalt pavement overlays in the trench patch area and conversations with Boeing staff that the settlement has been occurring over many months with an acceleration within the last couple of weeks. Lake Washington water surface varies through out the year by about two feet. The lowest lake level is near the end of December with the highest level at the end of April. The lowering of the lake level this fall probably has contributed to increased migration of the bulkhead backfill. At this point in time, the lake level is a few inches below the bottom of the hole created by the missing lagging. 4.0 RECOM EnE TDATION It appears that repairing the bulkhead lagging, backfilling the void, and replacing the concrete pavement is a cost effective solution to provide a stable pavement suitable for plane and vehicular traffic. At this time there are unknowns concerning the bulkhead, specifically the condition of the 4x12 braces back to an anchor pile, the anchor pile themselves, the cap beam of the bulkhead, and gaps in the lagging below the lakeside riprap line. The condition of these items can only be determined with the removal of the pavement. Tt/KCM recommends that during the pavement removal process an engineer be on site to observe and evaluate the condition of these items and make recommendations. Since the extent of the voids under the pavement could not be definitively established from site observations, the construction process needs to proceed so as to determine where the void ends by systematically removing the 12.7' strip of concrete pavement/patch behind the bulkhead. It is anticipated that the pavement will need to be removed to the old saw cut line shown in Figure 4. To keep the airplane towpath open, the process can be accomplished in stages with backfilling and temporary steel plates used to cover the effected areas when needed. Figure 5 outlines the steps recommended to repair the bulkhead and adjacent pavement. The following is a brief discussion of these steps. Note that the lake water line refers to the current lower winter lake level. During other times of the year, this water surface may be up to 2 feet higher. 3 A. The process should start by removing the concrete pad poured at the back of the bulkhead just north of the dock area. B. The 12.7' concrete pavement strip (10.1' slab with 2.6' trench patch)just west of the bulkhead should be removed beginning at the north end heading south. The slab needs to be removed to the point where it bears directly on the existing ground and the adjacent bulkhead lagging is in good condition. At this time one will also determine the extent of the void under the concrete pavement East of the utility trench. >KPo7 Page 3 1 Lake Washington Bulkhead/Pavement Evaulation-Boeing Renton Plant C. The braces need to be evaluated by an engineer for soundness and continuity. It is not know if construction of the adjacent utilities damaged the wood braces. Damaged and rotted braces need to be replaced. D. The bulkhead backfill needs to be potholed to determine if there are gaps in the lagging a couple of feet below the lake water line. If the lagging has gaps below the lake water line, it is recommended that 1" thick weathering steel plates be carefully pushed down behind the wall to approximately 2 feet below the lake side ground line. Vibration or pounding on the plates is not recommenced due to vibration sensitive soils in the area. E. The lagging above the lake water line needs to be replaced or adjusted such that gaps between lagging is less that 1/4" and the lagging is securely attached to the piles. The land side of the bulkhead needs to have 3/4" pressure treated plywood completely wrapped (front and back) in geotextile then nailed to the lagging to close off all gaps through the wall by covering all of the exposed wall. F. The wood cap beam on top of the bulkhead piles needs to be evaluated by an engineer for structural integrity and replaced as needed. G. The void can now be backfilled with compacted granular material (relatively well- graded sand and gravel) to the bottom of the adjacent concrete pavement and top of the bulkhead cap beam. During the backfill operation, it is recommended that several geotextile reinforced gravel dams be constructed perpendicular to the bulkhead. These should limit the exposure of undermined pavement should a section of the bulkhead fail in the future. Currently the void can travel a great distance parallel to the bulkhead from one breach in the lagging. H. The replacement slab needs to be reinforced concrete designed by and engineer for the anticipated vehicular and airplane loads. It is recommended that the slab extend approximately 1.5' underneath the adjacent concrete pavement (or further to fill any voids) to minimize potential differential movement between the new and existing pavement as shown in Figure 5. Since the repair work involves concurrent investigative effort, Boeing needs to be prepared for unknown issues that may arise as the extent of the void and condition of the bulkhead is determined during pavement and slab removal. The conceptual level estimated cost of the repair work is approximately $128,000. A breakdown of the cost estimate is attached after it the figures. Since the project is located along the shoreline of Lake Washington and may involve activities in the water adjacent to the bulkhead, a Shoreline and Hydraulic Projects Application may be required. Since this is an emergency repair activity, the process may be streamlined. Contact with regulatory agencies should be done as soon as possible to reduce approval time. With the lake level approaching its lowest annual level at the end of December (at which time it normally begins to increase), the repair work should take place immediately to take advantage of less dewatering problems. 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A 6 _ . . _ . _ 4�►�� ' ip V 11/14/00 E 4�A�.�^.������ I ��s`.` �© 3� '-k�'! ,:g;,ti3R 44se,+Tt / %, jj�-!,,.t tabs ,r h'Vi,. O I 5 r? UI After removing the existing concrete slab and utility patch, the following steps should be completed to repair the bulkhead and restore the pavement s g 1. Check condition of exposed struts and 3. Replace lagging and check cap beam 6. Backfill behind bulkhead apossible damage from previous utility work 4. Seal inside of lagging 7. Construct reinforced concrete slab g 2. Pothole next to lagging to verify battons g 5. Construct erosion control dams emf Tetra Tech/ BoeingCommercial Airplane GroupFigure 5. KCM, Inc. P 9 1917 First Avenue BULKHEAD INVESTIGATION PROPOSED BULKHEAD REPAIRS Seattle, Washington 98101 WOW i !IIIllR MOO IIMi i Mouth' I� .. u. . , � , ems I _ .. ..,, .. ... ,. _ . - . . . � .. • , Ce CONSTRUCTION COST ESTIMATE DATE PREPARED 11/16/00 lb OWNER BOEING AIRCRAFT COMPANY ESTIMATED BY: Tt/KCM PROJECT TITLE & LOCATION BOEING TOW PATH REPAIR STATUS DESIGN: CONCEPTUAL LEVEL RENTON WASHINGTON ITEM DESCRIPTION QUANTITY MATERIAL COST LABOR COST ENGINEERING ESTIMATE NUMBER UNIT UNIT COST TOTAL UNIT COST TOTAL UNIT COST TOTAL - : •= SECTION 02220 SITE DEMOLITION SLAB REMOVAL 1000 sf $5.00 • $5,000 $10.00 $10,000 $15.00 $15,000 -- DISPOSAL 25 cy $5.00 $125 $20.00 $500 $25.00 $625 SECTION 02300 EARTHWORK BACKFILL&COMPACTION 70 cy $20.00 $1,400 $20.00 $1,400 $40.00 $2,800 TEMPORARY FILL AND PLATE COVER 1000 sf $5.00 $5,000 $5.00 $5,000 $10.00 $10,000 GEOTEXTILE FABRIC 600 sf $2.00 $1,200 $2.00 S1,200 $4.00 $2,400 _ GEOTEXTILE DAMS 110 If $10.00 $1,100 $15.00 $1,650 $25.00 $2,750 SECTION 03300 CAST-IN-PLACE CONCRETE • STRUCTURAL SLAB 22 cy $200.00 $4,400 $200.00 $4,400 $400.00 $8,800 • - ' SECTION 05120 STRUCTURAL STEEL STEEL PLATES FOR BULKHEAD REPAIR 11400 lb $2.00 $22,800 $2.00 $22,800 $4.00 $45,600 TPAGE 1 PRINTED 11/17/00 8:22 AM ..ydi is:,.,.; CONSTRUCTION COST ESTIMATE DATE PREPARED 11/16/00 = OWNER BOEING AIRCRAFT COMPANY ESTIMATED BY: Tt/KCM PROJECT TITLE & LOCATION BOEING TOW PATH REPAIR STATUS DESIGN: CONCEPTUAL LEVEL RENTON WASHINGTON ITEM DESCRIPTION QUANTITY MATERIAL COST LABOR COST ENGINEERING ESTIMATE NUMBER UNIT UNIT COST TOTAL UNIT COST TOTAL UNIT COST TOTAL SECTION 06100 ROUGH CARPENTRY TREATED PLYWOOD 300, SF $2.00 $600 $2.50 $750 $4.50 $1,35C SUBTOTAL $41,625 $47,700 89,325 GENERAL CONDITIONS (5%) 4,466 MOBILIZATION°0%) 8,933 SALES TAX(8.2%) 3,413 CONTINGENCY (20%) 21,227 CALCULATED PROJECT TOTAL 127,36^ PROJECT TOTAL' $128,00C_ F:\0-2900000\2040007\Task 200-Pier Repair Study\COSIEST\(DMPCOST.xls)CLFCE PAGE 2 PRINTED 11/17/00 8:22 AM „ . .„ .. „ ... --.....:i •• 1 ..Z.• Bulkhead N 1 ake 1 • .. 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