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Home My WebLink AboutPermit L94-0065 - CITY OF TUKWILA - DUWAMISH RIVER TRAIL SEPA ENVIRONMENTAL IMPACT STATEMENT.. L94 -0065 DUWAMISH GREEN RIVER TRAIL SEPA ENVIRONMENTAL IMPACT STATEMENT O`�Q'pa� �� Go ocg 0 (5' (e,c��a� es rc oc., Oc, 'te e-9 •P *9t UNDERSTANDING OF PROJECT OBJECTIVES APPROACH TO MEETING OBJECTIVES IDENTIFY & DISCUSS KEY ISSUES KNOWLEDGE/EXPERIENCE WITH WSDOT /FED. AID REQUIREMENTS PROJECT TEAM PROJECT MANAGER ENVIRONMENTAL PLANNING & PERMITTING EXPERIENCE EXPERIENCE, PERFORMANCE & REFERENCES ON SIMILAR PROJECTS TOTALS SCORING SHOULD RANGE FROM 1 TO 4: 1) OUTSTANDING; 2) AVERAGE /ADEQUATE; 3) INSUFFICIENT INFORMATION; 4) NO INFORMATION LOWEST TOTAL SCORE IS BEST CITY OF TUKWILA 3 MITIGATEf DETERMINATION OF NONSIGNIF, ONCE (MDNS) DESCRIPTION OF PROPOSAL: Shoreline Substantial Development permit request for 1.28 mile segment of Green /Dufwamish Trail; associated parking; 3 fishing shelters; sidewalks on 48th Avenue S.; and associated landscaping. The project is located within the Tukwila Shoreline Management Area, and is designated as "Urban" Shoreline. This project -. relates to Shoreline Management file #L94-0064. PROPONENT: CITY OF TUKWILA, PARKS DEPT. LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, ADDRESS: PARCEL NO: SEC /TWN /RNG: SE 10 -23 -4, NE 12 -23 -4, NW & SW 14-23-4, SE 23 -23 -4 LEAD AGENCY: CITY OF TUKWILA FILE NO L94-0065 City has determined that the proposal does not have a probable.', significant adverse impact on the environment..` An environmental impact statement (EIS) is not required under`RCW 43.21c,.030(2)(c).: This decision was made after review of a completed environmental °checklist and other information on file with the .lead agency. This information is available to the public on request. The conditions to this SEPA' Determination are attached. This DNS is is ued n er 197 -11- 340(2).. Comments must be::submitted by _ 2chib2r o9�}: /376 The lead agency will not act on this proposal l for 15 days from the date below. L. Ri Beeler, Respons'i� le fficial. City of Tukwila, (206) 431 -3680 6300 Southcenter Boulevard Tukwila, WA 98188 You may appeal this determination to the :City 'Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above signature date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Department of Community Development. Address: Applicant: Permit No: Type: Location: Parcel #: Zoning: ******************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** 1. Prior to issuance of development permits, the applicant shall comply with the following conditions: 1. Identify NGV Datum on plans for correct reference datum. 2. Provide a monitoring /riverbank maintenance /restoration program for the life of the project. The program shall include visual observation of slope conditions, bi- annually, during low river levels. If erosion is detected, measures to restore the slope shall be proposed and implemented. 3. All excavating /filling in the riverbank shall follow "King County's Guidelines for Bank Stabilitzation Projects ". 4. Construction for trail project may begin only after bank stabilzation project (Shoreline #L94 -60) has been completed. CITY TUKWILA CONDITIONS CITY OF TUKWILA L94 -0065 P -SEPA DNS SE 10 -23 -4, NE 12 -23 -4, NW & SW 14 -23 -4, : Status: APPROVED Applied: 08/10/1994 Approved: 10/03/1994 SE 23 -23 -4 CITY OF TUKWILA MITIGATED DETERMINATION OF NONSIGNIFICANCE (MDNS) DESCRIPTION OF PROPOSAL: Shoreline Substantial Development permit request for 1.28 mile segment of Green /Dufwamish Trail; associated parking; 3 fishing shelters; sidewalks on 48th Avenue S.; and associated landscaping. The project is located within the Tukwila Shoreline Management Area, and is designated as "Urban" Shoreline. This project relates to Shoreline Management file #L94 -0064. PROPONENT: CITY OF TUKWILA, PARKS DEPT. LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY: ADDRESS: PARCEL NO: SEC /TWN /RNG: SE 10 -23 -4, NE 12 -23 -4, NW & SW 14 -23 -4, SE 23 -23 -4 LEAD AGENCY: CITY OF TUKWILA FILE NO: L94 -0065 The City has determined that the proposal does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21c.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. The conditions to this SEPA Determination are attached. Th4s DNS is iss ed under 197 -11- 340(2). Comments must be submitted by . The lead agency will not act on this proposal for 15 days from the date below. L. Ric reeler, Responsible Official Date C! y of Tukwila, (206) 431 -3680 6300 Southcenter Boulevard Tukwila, WA 98188 You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above signature date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Department of Community Development. A F F I D A V I T ROBIN R STANLEY O Notice of Public Hearing fl Notice of Public Meeting O Board of Packet O Board of Packet Adjustment Agenda Appeals Agenda LI Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet O F D I S T R I B U T I O N hereby declare that: O Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit fl Determination of Non - significance TMitigated Determination of Nonsignificance Determination of Significance and Scoping Notice O Notice of Action ❑ Official Notice Other Li Other was mailed to each of the following addresses on 10/3/94 MAILED TO DEPT OF ECOLOGY MAILED TO THE MUCKLESHOOT INDIAN TRIBE MAILED TO FRIENDS OF THE DUWAMISH SENT TO THE MAYORS OFFICE SENT TO THE CITY CLERKS OFFICE ,)0 FAXED TO THE SEATTLE TIMES TO BE PUBLISHED ON FRIDAY OCT 7, 1994 /d(a -1e Q/070/.11 Name of Project DUWAMISH GREEN RIVER TRAIL Signatur File Number L94 -0065 CHECKLIST: ENVIF(,,-MENTAL REVIEW /SHORELINE P „MIT MAILINGS { { { FEDERAL AGENCIES )U.S. ARMY CORPS OF ENGINEERS )FEDERAL HIGHWAY ADMINISTRATION )DEPT. OF INTERIOR -FISH & WILDLIFE SERVICE WASHINGTON ( )U.S. ENVIRONMENTAL PROTECTION AGENCY ( )U.S. DEPARTMENT OF H.U.D. (REGION X) STATE AGENCIES ( )OFFICE OF ARCHAEOLOGY ( )TRANSPORTATION DEPARTMENT ( )DEPT. OF NATURAL RESOURCES ( )OFFICE OF THE GOVERNOR ( )DEPT. OF COMMUNITY DEVELOPMENT ( )DEPT. OF FISHERIES ( )K.C. PLANNING & COMMUNITY DEV. ( )BOUNDARY REVIEW BOARD ( )FIRE DISTRICT #11 ( )FIRE DISTRICT #2 ( )SOUTH CENTRAL SCHOOL DISTRICT ( )TUKWILA LIBRARIES ( ) RENTON LIBRARY ( )KENT LIBRARY ( )CITY OF SEATTLE LIBRARY ( )US WEST ( )SEATTLE CITY LIGHT ( )WASHINGTON NATURAL GAS ( )WATER DISTRICT #75 ( )SEATTLE WATER DEPARTMENT ( )GROUP W CABLE ( )OLYMPIA PIPELINE ( )KENT PLANNING DEPARTMENT ( )TUKWILA CITY DEPARTMENTS: ( )PUBLIC WORKS ( ) FIRE ( )POLICE ( )FINANCE ( )PLANNING ( )BUILDING ( )PARKS AND ORECREATION ( )TUKWILA MAYOR ( }DEPARTMENT OF SOCIAL & HEALTH SERVICES ( )DEPT. OF ECOLOGY, SHORELANDS DIVISION ( )DEPT. OF ECOLOGY, SEPA DIVISION* ( )DEPARTMENT OF WILDLIFE ( )OFFICE OF ATTORNEY GENERAL *SEND CHECKLIST WITH DETERMINATIONS AND *SEND SITE MAPS WITH DECISION KING COUNTY AGENCIES ( )KING COUNTY DEPT. OF PARKS ( )HEALTH DEPARTMENT ( )PORT OF SEATTLE ( )BUILDING & LAND DEV. DIV.- SEPA INFORMATION CENTER SCHOOLS /LIBRARIES ( )HIGHLINE SCHOOL DISTRICT ( )KING COUNTY PUBLIC LIBRARY ( )SEATTLE MUNICIPAL REFERENCE LIBRARY ( )SEATTLE SCHOOL DISTRICTS ( ) RENTON SCHOOL DISTRICT UTILITIES ( )PUGET SOUND POWER & LIGHT ( )VAL -VUE SEWER DISTRICT ( )WATER DISTRICT #20 ( )WATER DISTRICT #125 ( )CITY OF RENTON PUBLIC WORKS ( )RAINIER VISTA ( )SKYWAY CITY AGENCIES ( ) RENTON PLANNING DEPARTMENT ( )CITY OF SEA -TAC ( )CITY OF SEATTLE ( )CITY OF BURIEN ( }TUKWILA PLANNING COMMISSION MEMBERS ( )TUKWILA CITY COUNCIL MEMBERS OTHER LOCAL AGENCIES ( )PUGET SOUND REGIONAL COUNCIL ( )P.S. AIR POLLUTION CONTROL AGENCY ( )SW K.COUNTY CHAMBER OF COMMERCE ( )MUCKLESHOOT INDIAN TRIBE ( )DUWAMISH INDIAN TRIBE MEDIA ( )DAILY JOURNAL OF COMMERCE ( )VALLEY DAILY NEWS ( )METRO ENVIRONMENTAL PLANNING DIV. OFFICE /INDUSTRIAL 5,000 GSF OR MORE RESIDENTIAL 50. UNITS OR MORE RETAIL 30,000 GSF OR MORE ( ) HIGHLINE TIMES ( )SEATTLE TIMES L PUBLIC NOTICE MAILINGS FOR PERMITS SEPA MAILINGS Mail to: (comment period starts on date of mailing) Dept. of Ecology Environmental Review Section Applicant Other agencies as necessary (checked off on attached list) Include these documents: SEPA Determination (3 -part form from Sierra) Findings (staff report, usu. with MDNS) SEPA Checklist (filled out by applicant) Drawings /Plans of project (site plan, elevations, etc. from PMT's) Affidavit of Distribution (notice was mailed & sent to newspaper). SHORELINE MAILINGS Notice of Application: Notice of application for a substantial development Permit must be mailed to owners and to property owners within 300 feet of subject property, prepare an affidavit of publication, and publish two consecutive weeks with deadline for comments due 30 days after last newspaper publication date. Shoreline Permit: Mail to: (within 8 days of decision; 30 -day appeal period begins date received by DOE) Department of Ecology Shorelands Section State Attorney General Applicant Indian Tribes Other agencies as necessary (checked off on attached list). Include these documents: Shoreline Substantial Development Permit (3 -part form from Sierra) Findings (staff report, if applicable) Shoreline Application Form (filled out by applicant) Drawings /Plans of project (site plan, elevations, etc. from PMT's) Site plan, with mean high water mark & improvements Cross - sections of site w /structures & shoreline Grading plan _ Vicinity map SEPA Determination (3 -part form from Sierra) Findings (staff report, usu. with MDNS) SEPA Checklist (filled out by applicant) Any background studies related to impacts on shoreline Notice of Application Affidavit of Distribution (notice was mailed & sent to newspaper) Affidavit of Publication (notice was published in newspaper). RZA AGRA, Inc. Enaineerinp & Environmental Services 14 July 1994 Hough Beck & Baird, Inc. Lenora Square 100 Lenora Street, Suite 516 Seattle, Washington 98121 -2725 Attention: Ms. Colie Hough -Beck, ASLA Subject: Summary of Site Reconnaissance Proposed Tukwila Duwamish Green River Trail Tukwila, Washington Dear Ms. Hough -Beck: 11335 NE 122nd \,\'av 7 ;. t 1Gu Kir v %A 9U34•691;:, 020.400D �.0u: FAX !2061 821.3914 11-09731-00 RECEIVED AUG 1 01994 COMMUNITY DEVELOPMENT Presented herein is a summary of the geotechnical reconnaissance we completed along the proposed route of the Tukwila Duwamish Green River Trail in Tukwila, Washington. This letter describes our observation of river bank conditions along the proposed trail route, and presents general recommendations regarding site drainage and monitoring. The purpose and scope of our reconnaissance were discussed during our 12 July 1994 meeting with representatives of Hough Beck & Baird, and the City of Tukwila Parks Department and Public Works Department. The purpose of reconnaissance was to observe conditions along the proposed trail route in order to assess potential areas of erosion or slope instability which could impact construction and utilization of the trail along the river. We also observed slope and soil conditions in order to provide assistance to the project designers in regard to surface water drainage. Authorization to proceed with this study was provided by Ms. Colie Hough -Beck on 12 July 1994. A preliminary set of the plans for the trail project were made available for our use. The plan set, dated 12 July 1994, included Sheets L -1, L -2, and L -7 through L -15, at a scale of 1 inch equal to 20 feet. The proposed trail consists of several sections which are intended to "fill in" between existing riverside trails or pathways. The largest portion of the trail extended from the northeast dead end of 48th Avenue South (48th Avenue South terminates at the Duwamish River) in the downstream direction to a point approximately 100 feet southeast of the southeast end of the 42nd Avenue South bridge over the Duwamish River. This portion of the proposed trail consisted of an existing gravel covered path, thickly vegetated undeveloped areas, as well as an existing sidewalk which will be incorporated into the trail. We also observed a shorter section of the trail route proposed to border the Green River in an area located southwest of the Black River Quarry and southeast of Fort Dent Park. This 0 AGRA Earth & Environmenta! Group Hough Beck and Baird, In 14 July 1994 11- 09731 -00 Page 2 section of the trail will the Homewood Suite development to the we onnect two existing developed trails along the river, one located on property to the east, and the other located on a commercial t. This location is described as the Fort Dent office park. An engineering geologi • t from our firm conducted the field reconnaissance on 13 July 1994. The reconnaissance consisted of walking most of the proposed trail alignment, observing conditions along the rote and on the adjacent sideslopes extending down to the rivers. Low water levels afforded the opportunity to walk along the toe of the river bank at many locations. A combinatidn of steep slopes and extremely thick vegetation necessitated viewing slope conditions from the far side of the river along the Boeing Credit Union property and a portion of the Fort Dena office park. Measurements were made of the significant erosional features we observed, and the entire river bank was photographed. Our observations are described below. Refe ence to trail route stationing is presented where applicable. FORT DENT OFFICE P The short section of tra an inside curve of the at the Homewood Suit west. This portion of t alders, and cottonwoo topography was humm us to conclude that t generally stable, but w localized oversteepenec RK (PLAN SHEET L -1) it in the Fort Dent office park extended approximately 620 feet along reen River. This portion of the trail will connect existing trails located s development to the southeast and the Fort Dent office park to the e trail route was thickly vegetated with grasses, blackberry bushes, trees. Evidence of past earthwork activity was observed as the cky in the area near the Fort Dent office park. Our observations lead e river bank sideslopes adjacent to the proposed trail location are II be susceptible to erosion by flowing surface water. We did observe t and near - vertical sections up to 2 feet in height along the upper break in slope. These locations were typically noted between Station 10 +00 and approximately Station 11 +50. Belo the near vertical slope break, the sideslopes were estimated to have an inclination of appr ximately 1 H:1 V (Horizontal:Vertical). The sideslopes were well - vegetated at most loc tions. An ADS drain pipe wa observed on the slope at approximately Station 10 +75. We did not observe water flowing from the pipe. The thick vegetation above obscured any evidence of past trench work. An erosional scar was we understand has alr design, was manifeste� southwest to the nort t observed between Stations 11 +50 and 11 + 80. This feature, which wady been identified and is currently being considered by the project I as a steep sided ravine -like feature which increased in depth from the east. AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 3 The toe of the slope at approximately Station 13 +30 contained a mound of soil debris which appears to have sloughed from the slope above at some time in the past. The mound was partially vegetated. The slope above the mound was well- vegetated, also. Sediment deposition has occurred in the bend of the river centered at approximately Station 13 +50. The creation of a point bar this location serves to reduce potential toe of slope erosion at low river levels and velocities. Soils observed in exposures along the trail in the Fort Dent area consisted of silt and silty sand mixtures. It should be noted that these soils are highly susceptible to erosion by flowing water. 48th Avenue South to Sammis Property (Plan Sheets L -7 through L -11) This portion of the proposed trail follows a meandering portion of the Duwamish River for a distance of approximately 2,778 feet. The alignment follows a route which extends westward from the 48th Avenue South dead end at Station 20 + 85, and terminates at the existing sidewalk located at the eastern side of the Sammis property. This interval includes an established gravel pathway, undeveloped and highly vegetated river bank areas adjacent to the Boeing Credit Union property, the Boeing property, and the existing business development located to the west. A 24 -inch diameter CMP was located on the river bank slope immediately north of the 48th Avenue South dead end. Some erosion of the slope below was apparent, as a vertical section of bank has been created by water discharging from the culvert. We do not consider this erosion to be significant enough to affect plans for the trail. We do recommend that the erosion in this area be monitored in the future. The gravel covered pathway extended from approximately Station 20 +85 to Station 31 +00, a short distance east of the existing pump station location at approximately Station 31 +60. The pathway featured a compacted sand and gravel surface with numerous depressions which are interpreted to contain ponded water after periods of rainfall. The adjacent river bank typically consisted of a 1.5H:1 V to 2H:1V sideslope extending downward either to the river, or to a terrace area locally as much as approximately 10 feet wide, before extending downward to the river. The sideslopes were generally well- vegetated and did not exhibit evidence of significant erosion or slope instability, except as noted below. Evidence of preferential surface water flow over the.sideslopes adjacent to the existing gravel path was observed at approximate Station locations of 25 + 60, 28 + 75, and 30 + 65. We have interpreted conditions at these locations to indicate that surface water periodically flows from the path in a concentrated form. These areas also appear to probably be used as river 0 AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11-09731-00 Page 4 bank fishing spots. While some of the vegetation disturbance and soil exposure may be resultant from foot traffic in the area, we believe that periodic surface water flow is leading to the erosion observed at these locations. We observed the soils along the bank at these locations to consist of fine sand and silty fine sand in a loose to medium dense condition. These soils should be considered extremely susceptible to disturbance by flowing water. The toe of the slope along the river at these locations varied from very gently sloping to vertical exposures up to approximately 18 inches high. That portion of the trail sideslope between approximately Station 31 +00 and the Boeing Credit Union property, located at approximately Station 35, featured a somewhat variable sideslope estimated to range from approximately 1.5H:1 V to 2H:1 V. Undercutting of the sideslope immediately adjacent to the river was evident along this location, but we would not consider it extreme. Vegetative cover in this area was very well established and is probably contributing to the stable banks at this location, in our opinion. The Boeing Credit Union property extends along the proposed trail alignment from approximately Station 35 to Station 43 + 60. It would have been necessary to cut a substantial amount of brush along this portion of the sideslope in order to view slope conditions directly. We did not wish to do this on the Boeing Company private property. Consequently, we viewed the bank from the toe of slope on the adjacent property, as well as from the opposite side of the river during low water conditions in the afternoon. We observed conditions to generally be consistent with those described in the 1989 Dames and Moore "Updated Riverbank Stabilization Study" report prepared for the Boeing Employees Credit Union project (Project No. 10863- 003 -016, April 24, 1989). The river bank slope in this area was well- vegetated, contained relatively uniform slope inclinations, and did not exhibit evidence of obvious slope instability or extreme erosion, based upon our observations. Another commercial development, described as "Parcel B" on plan sheet L -11, extended from approximately Station 43 +60 to the adjacent Sammis property located at approximately Station 48 + 63. The proposed trail location in this area was bordered by gentle slopes extending downward to a terrace area, in turn adjacent to the most gentle river bank slopes we observed. Some localized near - vertical soil exposures of limited height were observed near the eastern side of the development. However, the overall slope inclination decreased in the northerly direction. The slopes appeared stable and did not exhibit evidence of what we would consider significant erosion. We observed the condition of the slope area adjacent to the storm water outfall located at Station 48 + 15. A 36 -inch inside diameter concrete culvert was present at this location. Water flow from the culvert has eroded an area into the bank which was approximately 20 feet wide perpendicular to the river, and extended along the river for a distance of 0 AG RA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 5 approximately 15 feet. The erosional feature extended to a depth of approximately 4 feet below the end of the culvert. We observed some scattered rip rap located at the base of the erosional feature, as well on the slope above. This feature should not be considered one that poses an immediate threat to the stability of the hillside or the proposed trail, however. We recommend that it be considered for future monitoring and long term erosion mitigation as needed. A 6 -inch inside diameter concrete drain pipe was located on the western side of the erosional feature at approximately Station 48 + 24. We did not observe water flowing from the pipe while we were on site. Sammis Property to Station 0 + 00 (Plan Sheets L -11, 12, 13) The proposed trail route will follow an existing concrete sidewalk and asphalt paved vehicle access area located within the Sammis property commercial development. This portion of the proposed trail extends for a distance of approximately 1,350 feet west from the Boeing Credit Union property and meets a short interval of trail to be constructed starting at Station 0 +00 as shown on plan sheet L -13. Our reconnaissance of this area showed the sidesiopes adjacent to the river to be quite steep. We estimated inclinations to range from 1.5H:1V to 1 H:1 V, with localized vertical sections immediately adjacent to the river ranging from approximately 18 inches to 6 feet in height. Most of the slope along this area was well- vegetated. We observed apparent dumping of landscaping debris adjacent to the landscaped lawn area which was located south of the break in slope. Localized areas which apparently have been subject to downslope displacement of the landscaping debris, resulting in vegetation removal, were observed along the Sammis property. We also observed a small slump feature, the western limit of which was located approximately 40 feet east of Station 0 +00 as shown on plan sheet L -13. This feature, which was approximately 50 feet in width, was characterized as a small slump block with an approximate 2 foot vertical downset of the slope. The area was landscaped, however, and featured substantial grass growth in the downset area. This feature was bordered by a vertical section of bank extending down to the river. This vertical section measured approximately 6 feet in height. A toppled tree was present at this location, also. Two storm sewer outfalls were located along the river bank within the Sammis property. Some erosion of the soil at the base of the concrete wall below the easternmost outfall has occurred. Soil has been eroded from below the concrete to a depth of approximately 10 inches. The slope below the outfall was mantled with rip rap and appeared to be performing well, however. We observed an apparent leaking irrigation valve on the slope adjacent to the river located approximately 120 feet east of the easterly storm sewer outfall. The soil on the slope below the valve was saturated. 0 AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 6 Western End of Project, Station 0 + 00 to Station 1 + 40 (Plan sheet L -13) The westerly section of the proposed trail extended primarily through a landscaped area and gravel surface area adjacent to the Sammis property. This portion of the trail was set back a greater distance from the break in slope than most of the other portions of the trail. We observed the adjacent sideslope to be heavily vegetated and featured an inclination ranging from approximately 1 H:1 V to 2H:1 V. The slope immediately adjacent to the river was generally free of vegetation and exhibited evidence of what we would consider moderate erosion. Several leaning tress were observed along this location. Overall, we would consider the river bank slope adjacent to this portion of the trial to be stable. CONCLUSIONS AND RECOMMENDATIONS The reconnaissance included direct visual observation of much of the alignment, as well as observing some areas from the far side of the river. It is our conclusion that the existing slopes adjacent to the proposed trail route currently present no unstable conditions which will prevent construction and utilization of the trail as proposed. The erosional feature noted between Stations 11 + 50 and 11 + 80 in the Fort Dent area will require repair, but we understand that this feature is a known entity which is being addressed by the current design. We described several locations where apparent surface water flow and /or foot traffic have resulted in erosion to sideslope soils. While these features should not be considered a problem in their present condition, their condition should be monitored subsequent to trail construction, in our opinion. These features, observed at approximate Stations of 25 + 60, 28 +75, and 30 + 65, would be eroded further if concentrated surface water flow from the hard surfaced trail is directed over the slope at these locations. We recommend that surface water either be directed away from these areas, or that their condition be assessed as part of a regular monitoring program. We observed erosion of the river bank at location of the storm drain outfall located at the dead end of 48th Avenue South, and at the outfall located at Station 48 +15. We do not consider this erosion to present a problem to construction or utilization of the trail as planned, at this time. We recommend that the outfall areas be monitored at least once a year in order to assist in development of potential future repairs. It is our opinion that the practice of disposing of landscaping debris over the break in slope adjacent to the Sammis property development is one which will lead to accelerated erosion of the river bank with time. Landscaping debris absorbs moisture during the wetter times of the year, and the attendant weight increase can lead to downslope displacement of the debris, removing river bank vegetation in the process. This can lead to accelerated erosion of the river bank. We described above evidence of past episodes of downslope displacement of landscaping debris. We recommend that this practice be eliminated in order to reduce erosion AGRA Earth & Environmental Group Hough Beck and Baird, Inc. 14 July 1994 11-09731-00 Page 7 of the river bank. We recommend that the river bank along the Sammis property be monitored at least twice a year, paying particular attention to the oversteepened portions of the river bank. We observed only one location where significant downslope displacement of soil was obvious (not to be confused with downslope displacement of landscaping debris). The monitoring program should be geared such that a determination of downslope soil displacement or erosion is carefully made and evaluated relative to potential impacts to the City property. The monitoring program should ideally take place during the spring or summer when water flow is low, as well as in the wetter winter months along the Sammis property. Monitoring during low river levels allows direct visual observation of conditions at the toe of the slope. This is the location of most of the oversteepened portions of the slopes adjacent to the trail. Also, we recommend that the portion of the river bank slopes between the trail and the edge of the river be observed in order to detect areas where surface water flow may be eroding the sand and silty sand soils. These soils are extremely susceptible to erosion by flowing water. If left unchecked, erosion of these soils could lead to sufficient soil loss which would require more expensive repair efforts than those undertaken when the erosion is at an early stage, in our opinion. This reconnaissance was intended to identify conditions along the trail slopes on a single occasion. It should be recognized that gradual erosion of the river banks will occur with time, especially along the outside bends of the river. This is a natural process, and its progression should be monitored as part of regular maintenance activity conducted along the City's riverfront property, in our opinion. `EXPIRES 1 / 24/ S"-- Hough Beck and Baird, Inc. 14 July 1994 11- 09731 -00 Page 8 We hope this letter meets your current needs. It has been our pleasure to assist you with this project, and we look forward to its successful completion. If you should have any questions, please do not hesitate to contact the undersigned at your convenience. Respectfully submitted, RZA AGRA, Inc. David C. Williams Associate John E. Zipper, Senior Associate DCW /JEZ /clt �.,..�.- .. , STATE OF WASHINGTON DEPARTMENT OF ECOLOGY P.O. Box 47600 • Olympia, Washington 98504 -7600 (206) 407 -6000 • TDD Only (Hearing Impaired) (206) 407 -6006 October 25, 1994 Ms. Libby Hudson City of Tukwila 6300 Southcenter Blvd Suite 100 Tukwila WA 98188 Dear Ms. Hudson: Thank you for the opportunity to comment on the prethreshold consultation to construct a 1.28 mile trail segment of the Green /Duwamish River Trail. We reviewed the environmental checklist and have the following concerns. As noted in the environmental checklist, a shoreline permit will be required for the project. If you have any questions, please call Mr. Shorelands Program at (206) 649 -7274. Sincerely, M. Vernice Santee Environmental Review Section MVS: 94 -7575 cc: Bob Fritzen, NWRO Janet Thompson, NWRO Bob Fritzen with the RECEIVED OCT 2 71994 coMMt DEVELOr,v; N.1 P92 :, RECEIVED Control No. ALE 1 0 1994 SEPA File No. 94 oceA tJ COMMUNITY DEVELOPMENT Fee o. pJ )p\ ENVIRONMENTAL CHECKLIST A. BACKGROUND 1. Name of proposed project, if applicable: Tukwila Duwamish /Green River Trail 2. Name of applicant: City of Tukwila 3. Address and phone number of applicant and contact person: Mr. Don Williams (206)433 -1800 Tukwila Parks and Recreation Dept., 6200 Southcenter Blvd., Tukwila, WA 98188 4. Date checklist prepared: July 25, 1994 5. Agency requesting checklist: City of Tukwila 6. Proposed timing or schedule (including phasing, if applicable): Construction is anticipated to begin in September 1994. This project will be completed in one phase. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. No, this project completes the final phase of this trail system. NOTE: The trail section located within the Riverside and Fareway Center has been applied for under a separate SEPA and Shoreline Permit. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. A Geo- Technical review was performed of the river bank in July 1994 by RZA AGRA. A copy of this review is attached. 1 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. A shoreline permit for a portion of the trail was applied for in June 1994 for the Riverside Inn and Fareway Center locations (City of Tukwila trail easement). A separate Shoreline Permit has also been applied for regarding a "washed" out area located at Station 11+50 within the trail dedicated area at the Fort Dent Office Park. The trail improvements in this area are part of this application. 10. List any government approvals or permits that will be needed for your proposal. City of Tukwila City of Tukwila State of Washington Environmental Checklist (SEPA) Grading Review Shorelines Permit 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. Section E requires a complete description of the objectives and alternates of your proposal and should not be summarized here. The trail will be used by pedestrians and bicyclists and will allow for emergency vehicle access and maintenance equipment. The proposed trail sections will provide valuable connections to the Duwamish /Green River Trail systems both local and regional. This section of trail is approximately 1.2 miles in length. 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. The trail will be located along the southerly bank of the Duwamish /Green River between 42nd' Avenue South and 48th Avenue South, along the southeast side of 48th Avenue South from the river dike to Interurban Avenue, and along the south bank of the Duwamish /Green River between Southcenter Boulevard and Parcel 2 of the Fort Dent Office Park. A vicinity map is attached to the drawings. 13. Does the proposal lie within an area designated on the City's Comprehensive Land Use Policy Plan Map as environmentally sensitive? A major portion of the trail located adjacent to the Green/Duwamish River is located within the City's Shoreline Master Program. 2 TO BE COMPLETED BY APPLICANT Evaluation for Agency Use Only B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other The river dike on which the trail will be developed is relatively flat. The river bank adjacent to the dike has slopes up to 50 %. b. What is the steepest slope on the site (approximate percent slope)? Side slopes of the existing dike are approximately 50 %. Top of the existing dike is flat. 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. Newberg soils exist within the project limits. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. A Geo- Technical review was performed in July 1994 during low river flows by RZA AGRA. This report is attached. There were no unstable soils found that will affect or be impacted by the construction of this trail. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Approximately twenty -five hundred (2500) cubic yards of gravel borrow and crushed rock fill will be imported to provide leveling base coarse for the asphalt trail. Source of fill will be determined through bidding process. Fill will meet strict specifications for size of particles will be clean and graded. f. Could erosion occur as a result of clearing, construction,or use? If so, generally describe. Yes, portions of the dike will be disturbed during the clearing process. They will be seeded after construction with erosion control grass. The slopes of the dike will not be disturbed. Evaluation for Agency Use Only g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The trail will consist of a twelve (12) feet wide asphalt surface for approximately a 1.2 mile length. Also, a 5 foot to 6 foot wide concrete sidewalk will be added to the southeast side of 48th Ave. S. where these sidewalk sections are missing. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: All disturbed areas will be seeded with erosion control grass. 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. The construction process will create minimal dust activity during the grading phase. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. None to our knowledge. c. Proposed measures to reduce or control emissions or other impacts to air, if any: Construction will conform to local and state regulations regarding air quality. . ..� 3. Water a. Surface: 1) Is there any surface water body on or in the immediate vicinity of the site (including your -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 Duwamish / Green River is located adjacent to several proposed trail sections. 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, several trail sections are is located within 200 feet of the Duwamish /Green River. These trail plans are attached. 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. The trail project is not located within the 100 year flood plain. Evaluation for Agency Use Only Evaluation for Agency Use Only 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 materials 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. Does not Apply 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. Trail Sections located adjacent to the River: Since the trail is located adjacent to the River, the majority of storm water will sheet flow from the trail toward the river. This storm water will be filtered through the trail shoulder, dike slope plantings and existing vegetation prior to entering the river. In areas where the Geo- Technical report advises the storm water to be collected on the back side of the trail. Stormwater on 48th Ave. S. Trail Head: Stormwater runoff sheet flows from 48th Avenue S. and is surrounding parcels to a series of catch basins along 48th Avenue S. and collected in an existing storm sewer system. This storm sewer system discharges directly into the Duwamish River. The trail head requires the addition of two catch basins on 48th Avenue S. that will tie into the existing storm sewer. 2) Could waste materials enter ground or surface waters? If so, generally describe. No. Evaluation for Agency Use Only d. Proposed measures to reduce or control surface, ground, and runoff water impacts,if any: All disturbed vegetative areas located adjacent to the trail will be seeded with erosion control grass seed to absorb trail surface runoff. 4. Plants a. Check or circle types of vegetation found on the site: X deciduous tree: alder, maple, aspen, other cottonwood X evergreen tree: fir, cedar, per, other X shrubs _X grass pasture crop or grain wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other water plants: water lily, eelgrass, milfoil, X other types of vegetation, non - native species, i.e. blackberry b. What kind and amount of vegetation will be removed or altered? Approximately 22 trees will be removed. Overgrown blackberries and understory grasses will also be removed. c. List threatened or endangered species known to be on or near the site. None to our knowledge. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Erosion control grasses will be used on all disturbed areas adjacent to the trail. Tree plantings will also be provided in areas where trees do not currently exist. Evaluation for Agency Use Only 5. Animals a. Circle any birds of animals which have been observed on or near the site or are known to be on or near the site: birds: hawk, heron, songbirds, migratory water fowl mammals: beavers, raccoons, squirrels, small rodents fish: bass, salmon, trout, perhaps some freshwater mussels in watercourses b. List any threatened or endangered species known to be on or near the site. None to my knowledge. c. Is the site part of a migration route? If so, explain. The Duwamish /Green River is a migration route for fish. This site is also located in the Pacific Flyway. d. Proposed measures to preserve or enhance wildlife, if any: The understory vegetation located on the riverbank will not be disturbed. New deciduous and evergreen trees will be planted in areas along the trail adjacent to the river bank where no trees currently exist. 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. No energy sources are required for this project. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No. Evaluation for Agency Use Only 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: No energy is required for this project. 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. No. 1) Describe special emergency services that might be required. Access will be provided for aid cars and fire trucks for trail user emergencies and for river access. 2) Proposed measures to reduce or control environmental health hazards, if any: Not required for this project. b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? The industrial, commercial and office uses will not affect this project. 2) What types and levels of noise would be created by or associated with the project on a short-term or long -term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. Minimal construction noise will occur from grading, hauling, and construction of the asphalt trail. 3) Proposed measures to reduce or control noise impacts, if any: None are necessary, these impacts are very minimal. Construction hours and equipment will be required to meet the City's noise ordinance. 9 Evaluation for Agency Use Only 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? The existing Duwamish /Green River dike provides flood control measures for surrounding properties. Adjacent properties include industrial, commercial and office uses. b. Has the site been used for agriculture? If so, describe. Not to our knowledge. c. Describe any structures on the site. None. d. Will any structures be demolished? If so, what? No. e. What is the current zoning classification of the site? Regional Retail and Light Industry. f. What is the current comprehensive plan designation of the site? Commercial and Light Industrial If applicable, what is the current shoreline master program designation of the site? Tukwila Shoreline Master Program /Urban Environment h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. This project falls in the jurisdiction of the City's Shoreline Master Program. g. i. Approximately how many people would reside or work in the completed project? The project will provide recreation opportunities for people working adjacent to the trail, people commuting to work and people recreating. Also organized groups will use the trail for recreation events. 10 7. j. Approximately how many people would the completed project displace? None. k. Proposed measures to avoid or reduce displacement impacts, if any: Does not apply. I. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: The trail will provide recreation opportunities within the River environment zone which is compatible with the City's land use plan. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low- income housing? Does not apply. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low- income housing. Does not apply. c. Proposed measures to reduce or control housing impacts, if any: Does not apply. 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? Three fishing shelters approximately ten (12) feet in height are proposed adjacent to the trail. The shelter materials shall be steel, wood and concrete. 11 Evaluation for Agency Use Only b. What views in the immediate vicinity would be altered or obstructed? None. c. Proposed measures to reduce or control aesthetic impacts, if any: Aesthetics will be enhanced by providing visual access to the Duwamish /Green River and the addition of several trees. 11. Light and Glare a. What type of light or glare will the proposal product? What time of day would it mainly occur? Lighting may occur at the 48th Avenue South trail head. b. Could Tight or glare from the finished project be a safety hazard or interfere with views? No. c. What existing off -site sources of Tight or glare may affect your proposal? Existing street lighting along 48th Ave. S. would enhance bicycle and pedestrian use of the existing sidewalk. d. Proposed measures to reduce or control light and glare impacts, if any: Does not apply. 12. Recreation a. What designed and informal recreational opportunities are in the immediate vicinity? This project will provide informal recreation activities. This trail will connect with the local and regional Duwamish /Green River Corridor trail systems. This trail is also located adjacent to King County Fort Dent Park. b. Would the proposed project displace any existing recreational uses? If so, describe. No. 12 Evaluation for Agency Use Only • \. Evaluation for Agency Use Only c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: Recreation opportunities will be increased with the development of this trail. 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. None to our knowledge. b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. None to our knowledge. c. Proposed measures to reduce or control impacts, if any: Does not apply. 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. Southcenter Boulevard, 48th Avenue South, Interurban Ave. and 42nd Avenue South are the public streets surrounding the project. An access will be provided at the end of 48th Avenue S. for emergency and maintenance vehicles. b. Is the site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Metro bus service is provided daily along Interurban Avenue. A park and ride lot is located within 1/2 mile of the project. c. How many parking spaces would the completed project have? How many would the project eliminate? Seven (7) new parking spaces will be provided. Informal parking (approximately 48 spaces located within the 48th Avenue South R.O.W. will be eliminated with the construction of this parking area. These 48 spaces are used by the local businesses. 13 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 new roads or streets are required, but a portion of the project includes improvements along 48th Avenue S., a public street. These improvements include constructing a 5 to 6 foot sidewalk along the southeasterly side of the street at locations where currently no sidewalk exists. In order to provide access to the trail head, 48th Avenue S. will be extended approximately 200 feet. 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. The new trailhead parking will generate approximately 3 trips per stall per day for approximately 21 trips. Peak volumes would occur during weekends and steelhead fishing season. g. Proposed measures to reduce or control transportation impacts, if any: None are necessary. 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. The development of this project may increase the demand for police and fire protection. b. Proposed measures to reduce or control direct impacts on public services, if any. The trail will provide adequate access for public services. 14 Evaluation for Agency Use Only 16. Utilities Evaluation for Agency Use Only a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. Storm sewer. 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. Storm drainage improvements for the project include two (2) catch basins for the new parking improvements at the end of 48th Avenue South. The new storm drainage improvements will tie into the existing storm drainage system located within the 48th Avenue S. R.O.W. C. Signature The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: d Date Submitted: ' 1 0 PLEASE CONTINUE TO NEXT PAGE. TO BE COMPLETED BY APPLICANT Evaluation for Agency Use Only E. SUPPLEMENTAL SHEET FOR ALL PROJECT AND NON PROJECT PROPOSALS The objectives and the alternative means of reaching the objectives for a proposal will be helpful in reviewing the aforegoing items of the Environmental Checklist. This information provides a general overall perspective of the proposed action in the context of the environmental information provided and the submitted plans, documents, supportive information, studies, etc. 1. What are the objectives of the proposal? The proposed trail will provide a valuable Zink for the existing Duwamish /Green River trail systems both local and regional. This trail will fulfill a major project goal stated in the City's Park and Recreation Comprehensive Plan. 2. What are the alternative means of accomplishing these objectives? Use of existing streets and sidewalks for pedestrian and bicycle travel. 3. Please compare the alternative means and indicate the preferred course of action: The proposed trail project is the preferred coarse of action to allow pedestrians and bicyclists to be separated from vehicular traffic on public streets. 4. Does the proposal conflict with policies of the Tukwila Comprehensive Land Use Policy Plan? No, the project is supported by the Comprehensive Land Use Policy Plan and the City's Shoreline Master Program. Proposed measures to avoid or reduce the conflict(s) are: Conflicts do not exist with this project. Separating the trail system from public streets will eliminate potential conflicts. 16 NOTES M 100 -TEAR % EINATPON 6 NOTED ON SURVEY ORA661C 0EET5 1. 2, NO 7 -13. APPROSWTELY 2.500 MSC YARDS Or CRUSHED 0001 NO OUVR 804800 SHILL BE 6WORIEO NO PLACED ON -SOE Fon TRAL W61RIK00N. ALL AREAS CASTOR= 61 CONSTRUCTIO# Sw11 OECOVE ER0508 CONTROL NTDROSEEDR6 PER SPEC91CATONS. AO AVER EINIR01.1E1TT NIO 60' LOW 1NPACT ENV.ONENT ZONE WERE INTERPOLATED FR08 OROBMRr Mil WATER/UNE Or VEGETATION ELEvADONS 010614 08 SURVEY CROSS - SECTIONS. REFER TO CATOYY C RPORAT6 CENTER 860105ED BORD6C IO OATE0 3/5/91 8011 08 118E PREYS 6(10001 671. 31.50 k 5TA 21100. Op1NA{Nt. PON SMELTS 2B6A 9815 ON ATTAOm WOILIIEIU.NriA PAWN= PCP COLT MAN O06O11ATT fiftEN• W11D.101f6 IMTLD 3161 " \ \ \ \ ' \ , ' \ \ • \ \AI k A" \\ \•..•A \\,\ CityFor: City Parks Don Williams, Director Prepared By: Hough Beck & Baird, 1000 Lenora, Suite 516 Seattle Washington 98121 (206) 682 -3051 LEGEND 0 BE NE805(0 OTO BE AIED D.A.S.P. MANORS APPLIED TROER SEPERA1E PEfYT. & Recreation Dept. Inc. ‘\\\ " '\\\\\\\ \\\\N \\ Cmetsufeards: KPFF Consulting Engineers 1210 TARO AwnA.. 5.:1. 900 5.0t181 rai Oton 96101 (206) 632 -5622 Townsend — Chastain & Associates .65081. 3.8A..mw ig1 6g.V1 96032 (206) 651 -2013 PLANT SCHEDULE 5781108. 01Y. BOTANICAL PONE/ st2E /RE8.0R5 C08■07 NAME ® 35 DER 808(6 PUN/ or 10 ACER RU8RU8/ RED RAKE 3 SNORE CORTN Y CAL; BIB. SPACING AS SHOWN ON PLAN Y CAL; BIB; SPACING AS 510814 ON PLAN Y- 6' NTH BIB; 5PACIN0 AS Wow ON PLAN VERTICAL DATUM LEGEND SURVEYORS - ENGINEERS DEVELOPMENT CONSULTANTS BECK Q B.URD. INC TOGO TUKWILA TRAIL TOPOGRAPHIC TTP. SECOON ASPHALT MAL LOCATION MAP DISTO G AC. TRAL 70 MOAN SCALE IN FEET Registration 'SW' 'LANDSCAPE PP TUKWILA DUWAMISH GREEN RIVER TRAIL Sheat Toe LAYOUT PLAN HOUGH BECK & BAIRD INC. AROI1EC1URE PLANNING & URBAN OE57GN • Approvals Number 9/149—J Dote 8/1494 DrawnJ.R.BjS.C. FL. /J.H. Sheet Number L-1 ...pp „, ,ow„ SEPASHORELINE & SUBMITTAL 8/5/94 Check Revisions mmton NO. NO r?) v 1° N.0.3 0 IA 0 1 ' - S C, ce-S 93,4•40•11, ./ Slat WWI. leal Mart NZ, ICOBVNIILS 051° ,. 5•1 G. ZUM61.1^Alk, tnEVEC' oor- C1". ,10 • 1 • 4t•I' FCCED 13CUNRO TWO (2) TOTAL D:ISTC CONCRETE 90EIPALIC 40 WYNN 0 20 40 60 SCALE IN FEET Registration ..... ,_...„. POI .1, TUKWILA DUWAMISH GREEN RIVER TRAIL Sh"t Title LAYOUT PLAN HOUGH BECK & BAIRD INC. LANDSCAPE ARDITEClURE RANKING & URBAN CESIUM • APP"mis 9201C-3 • Number Date 8/1/94 Drown JR/SC FLB./JH. Sheet Number L-2 SEPA & SHOREUNE SUBMITTAL 8/5/94 Check Revisions CCLtho ll 60.04 COMCAL .0. 311 HID Caeuling &timers QM Mira AWLS Sire 930 Seth* WaNN-patcn 990 C209 622-5922 622-1032 LOCATION MAP SCALE IN FEET TUKWILA DUWAMISH GREEN RIVER TRAIL sh"t Tale LAYOUT PLAN HOUGH BECK & BAIRD INC_ LANDSCAPE ARCH1TEC1LIRE PLANNING I uRBAN DESiON Number riiii:3 Dole J. A, F I. tar,: e hii Sheet Number L-3 SEPA & SHORELINE SUBMITTAL 8/5/94 Revis;ons 1=1 Caa/8'V Blanes, 601 i1WO Artrua &.t• 900 SAO* Wasnrnatcri9801 0061642.5822 Fax Q061642-800 0 20 40 60 SCALE IN FEET LOCATION MAP TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet TIUe LAYOUT PLAN Sheet Number L-4 HOUGH BECK & BAIRD INC. LANDSCAPE AROa1ECTuRE PINNING & UNWAN DESGN Approvals Number 8 1 9943 Dale Drawn J. SC. SEPA & SHORELINE SUBMITTAL 8/5/94 O FL ./JH. e01 Revisions ( xx " • 4:14 1—t /Erl ENJ 7 1 Consul8,2 &Prows 6O 740 MOLL SRN 990 * Sieftle. Washiectcn 990 2067 622-5872 Fax L206)622880 0 20 40 60 SCALE IN FEET TUKWILA DUWAMISH GREEN RIVER TRAIL sheet 'nth s LAYOUT PLAN HOUGH BECK & BAIRD INC. LANDSCAPE AROITECIURE PLANNING k URBAN DESIGN Approvals Number ,12,R13 Date ',....i Orson c SEPA & SHORELINE SUBMITTAL 6/5/14 check F.1 . &H. Revisions Sheet Number L-6 A 5 1-1 A L T I= A EM EN T .1,21.170;11. 404 ima 11.131 LOCATION MAP CALE IN FEET 41 r S1=, 1-1 E INA E -r 4 "7 201 Thera Awn* Sale 90) Seattle. WagNIniaon 9601 . (2061 1172-5822 Fax COD 622-800 TUKWILA DUWAMISH GREEN RIVER TRAIL She" Title LAYOUT PLAN HOUGH BECK & BAIRD INC. LANDSCAPE AFICHDEClURE PtAlieNG & Maxi DESIGN Approvals 9201C-3 Number Dote wrc. Drown i SEPA & SHORELINE SUBMITTAL 8/5/94 F.L• ./.„11. Check Sheet Number L-6 Revisk.n. 1 2� YMIcS 14' 1.a MILS STA 15+00 TO STA 19+24 eta MTOI COST ROAD PROFI`E Katz. e -r: 1.40 rar. MALL: 1.4• ROP.51* I STETION A • CaaJtiq & eers 001 IVO Amur. Suite 900 Soffit NMSN ptm 9801 0061 622-5871 Fu Qg6i 672800 STA 19+24 TO STA 20+06 ars *101 COST TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet Title • ROAD PROFILE AND TYPICAL SECTION HOUGH BECK & BAIRo INC. LANDSCAPE AROMECIURE PLANNe1D t URBAN DE901 Approvals 92 1 -3 Number 8 1 !4 Dote Drown JR SEPA & SHOREUNE SUBMITTAL 8/5/94 .15 Check FIB. JH. Sheet Number L -SA Revisions I . i le_i — i s L ' —1 .-L- ---A-- wq I r;:$ :I- 1 i , 1 la -L-1 1 ---1- _ — .._ -- .._. ! - — - — L— YMIcS 14' 1.a MILS STA 15+00 TO STA 19+24 eta MTOI COST ROAD PROFI`E Katz. e -r: 1.40 rar. MALL: 1.4• ROP.51* I STETION A • CaaJtiq & eers 001 IVO Amur. Suite 900 Soffit NMSN ptm 9801 0061 622-5871 Fu Qg6i 672800 STA 19+24 TO STA 20+06 ars *101 COST TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet Title • ROAD PROFILE AND TYPICAL SECTION HOUGH BECK & BAIRo INC. LANDSCAPE AROMECIURE PLANNe1D t URBAN DE901 Approvals 92 1 -3 Number 8 1 !4 Dote Drown JR SEPA & SHOREUNE SUBMITTAL 8/5/94 .15 Check FIB. JH. Sheet Number L -SA Revisions 76i. CONSTRUCT:IN BETWEEN STATORS 7 25+60 MD 30+65 SAW/ BE CROSS - ED SLOR MAT FROM RNERSCE Cr MAIL TO DREES STOMMATER INTO INFILTRATION MONS. Ara rm. SECTION 'mown r ASPHALT OWL ,4411 • 44.7.• .'` AI.. Wel, Yel, — C IRCE(S) TO BERM ASPHALT R A N../E ENJ r YR.. Wit OF •••• 7CM•Wra. Ur, MV/11.10 1.••••• Yell CI 111.• 1,07.10••• PIVInrof 0A 5Fo I_ 7- -r NOTE: RSHING SHRIEK LOCATIONS ARE APPROX. AWL LOCATORS SHALL OE FD LOCATED BASED UPON DISTNG nskiiNG LOCATORS ALONG THE RIVER BANK EtTREEN STA. 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SEPA & SHOREUNE SUBMITTAL 8/5/94 chReviecskions ..... 10. 31. ;�- WHITE WRNS COMMUNE ma DRIVEWAY PROrosw OWL MINOR UNE — LOCATE SIX (A) FEET fliCN ADJACENT FACE or axe YELLOW MINE AT FAYIOR LINE y �.,' , `�- �• c�.n Cir i L ``1.1 - n n LOCATION MAP 0 20 40 60 SCALE IN FEET Registr'a'tion ��' '� `•" GApprovals -- TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet Title LAYOUT PLAN HOUGH BECK & BAIRD INC. L"scAPE ARDVECnxE P1JM Nti t OF AN DESIaI Number 19421131/9;3 Dote Drown JR !S C Ft RlJH Sheet Number L-12 '—'22"—" SEPA & SHORELINE 8/5/94 Check Re ,s'ons ansa. 311ISUBMITTAL ansa .o. Registration .t,,v, iiiimie ...Pm TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet Title LAYOUT PLAN HOUGH BECK & BAIRD INC. LANDSCAPE ARCHIlECTURE PLANNING & URBAN DESIGN Approvals Number 9291C3 Dote 8/1124 Dro n ,R.,./- SEPA & SHORELINE SUBMITTAL 8/5/94 Check PLS. Alt Sheet Number L-13 Revisions ...,Z. ran; BOLLARDS RDST1PRIOR TO ASPHALT IAVNG TAO (2) 28 5TAK0.0155 STEEL AOUNO-1CA0E0 TROD 50RE*i CONCRETE 1001WG SHALL HATE LT. BROOK (00150 ON TOP t SLOPE TO GRAN. n1IED BOLLARD SEE SPECS ASPHALT TRA0. /A REBAR K lr LONG ORAL HOLE 07 CENTER OF POST U. 5/0 (-) CLEAN 205HED GRA0a SUMP COMPACT 5uN83AOE- 0.025 A1W0CW BAND w/ 361 REFLECTIVE TAPE CONTRACTOR SHALL SOP MRCS FOR APPROVAL P0700 TO CONSTR. R COM CvNACC Etat .AP.NI PO 4 r 21 LANDSCAPE AREAS t RUST M ASPHALT AREAS C pram and LA NM WAC*c II.r1.101011A un Sq ./ 0*7 .0:0 10.1.000 MA.. rap7A WI 084 e. f.wm 17/ ).0 MSS la QM CIL PVC Af er..A ./ NS • .070 N CDARAV.8 HAL w De CI NAI. In. .../V 14 RC ./r. S. 11 C... om.t AUR h NKA. HAY CNv HOP AS AHq.O A Rum RIVERSIDE OF TRAIL CRASS 5EEONG ALL AREAS 0511NBED BY CONSTRUCTION NOTE: TRAIL CONSIRUCTON BETWEEN STAION5 25.60 AND 50.65 SHALL 8E CR0511-SLOPED A*00 TROY RMR561E OF TRIAL NLAN0 SOC Cr TRAK. CRASS SEEDNG ALL AREAS DISTURBED Br CONSTRUCTION 12'-0- TIP. Y -o - .A CAty. S4 FAL HU ARAR AH..AI 1•4-401:11 A CK CHEM CRUSIOD ROCK 5NOULDER. YAK. 5:1 SLOPE ASPHALT PANTO ASPHALT-L0w EDGE .1' ABOVE nN191 GRADE CRUS.EO ROCK SHOULDER. MAA 5:I SLOPE Em5185 GRADE NAMES OFIXED BOLLARD NOT TO SCALE TAS STIPPOST POST MULL IS BISTLLL82 PRIOR TO PATIOS N5TALL PICNIC TABLE t CONCRETE FOOTING PER MFRS RECOMMOOATONS PICRIC TARS POST - COMM O MIDDLE Of PAVANS ORO 1115115 OTI�r NOM ON 051218/5 CONCRETE PAVNC OPICNIC TAILE NOT TO SCALE RAN aw 11•01 CAKII 1011. N10001 oivoAba. MAC OHAL ApNMtP Ma 10 MP./ roma o000iLno .omSTAXwGVP d emt CCHACT PATNA ma roolNalif 0a HAICDC HONMP b CRC. INPmoo[ A Rom. u IHI:0Im B REMOVEABLE BOLLARD Aw.A NOTE: 1. MULCH TREE RTC. SHA( 8E .70- OK 2. STAKES FOR TREES UP TO AID INCLUDING 1-3/! CA,. SNAIL BE 15 RE -BAR 3. STAKES FOR TREES 2. CA.. 0)50 S CAL SHALL 80 /0 RE -BAR BASE COURSE CONCRETE FOOTING MFRS. RECOMENMUONS CRUSHED ROCK CONPACT SUBCRADE PLACE RE -BAR STAKE ON wINE5(00 0 RD TREE VANES 1/2 DIA. SOFT DARR GREEN RUBBER HOSE - OVERLAP NOSE - ((` 11111 TREE TRIM( MUST NOT 8E N `\\I\ ��'�,i CONTACT TREE TRUNK w/ RE -EPR OR NRtE \\I /I WRAP ERRE ENDS �/ 4. AR011N0 RE -BAR '= (1) RE -BUR TOPOF REBAR (HD BURRS) �H ►1 TREE TRUNK Ar MULCH ruff SECURE TREE TRUNK TO STALE 8/ 3 RUB8E8 HOSES t 12 U GALT. 883E - TURN BACK A YRE ENOS INTO STARE PLANT AT SANE LEVEL AS r . TOP OF ROOTBALL TO 8E LEVEL w/ SURROUNDING 50L _.. �... �.. _.._.—FN158 GRAOE COMPACTED SUBBASE SECTION — BASE COURSE AMOUNT OF FILL REO11NE0 10 11RONDE POSOTE ORANACE VARIES THROUG4011 THE LENGTH Cr THE TRAIL SiqLOPE EMU FOR I P090TE 00A10GE 1� OTYPICAL SECTION THROUGH ASPHALT TRAIL NOT 10 SCALE NOM 1. MACH TREE 8836 SHALL BE 30 OA 2. STAKES FOR TREES UP TO AND NC.000D Y SHALL BE /5 RE -BAR 3. STAKES FOR 1REES 6' 0168 jibe* SHALL BE /0 MBAR (0271018 Trb ADN51 DE,AA 70 ALLOW FOR TREE "10901 GUARD- N TRUNK i� r MULCH TOP OF ROAR HD pURRS)� 8 (01171010 ADJUST DETAIL TO ALLEN FOR 75E Or -ARBOR GUARCr MN EKIsSOiNGL —/ HAN OLA. OF SECTION 80)1841 OPEN BURLAP AROUND TRUNK FOLD BACK AND UNDER DOME w/ 2/3 PLANING SOL 00 1/3 (I)5M0 50L - THOROUGHLY *TATER SETTLE ` COMPACTED EXISTING SOL MOUND 70 SUPPORT TREE 0111E BACOLLI70 PLACE RE -BAH STAKE ON S 07 TREE 1/2' CAA. 5077 DARN GREEN RUBBER HOSE - OVERLAP HOSE - TREE TRUNK MUST NOT BE N CONTACT w/ RE -BAR OR NNE V05 TREE TRUNK *RIP TYRE ENDS AROUND RE -BAR (7) RE -BAN SECURE TREE TRONK TO STAKE 0/ 3 RUBBER HOSES t 72 U GLV. TIRE - TURN BACK TWE ENDS TRIO STAKE PLANT AT SAYE LEVEL A5 GROwN. IOP OF 0001880E TO 8E TML w/ StNRRIXPDwF SOIL_FMASH GRME _Rr-u—u—n-1 _ -Hole ODECIDUOUS TREE PLANTING DETAIL NOT TO SCALE (05121G- / 7NAN DIA 800104.1 n911 OPEN BURLAP 111071830 IRUHK FOLD BACK IND AIDER BACKFILL 8/ 2/3 PLANTVIG 501 t 1/3 EK5TNG 500. - 177ROUCHLV WATER SETTLE COMPACTED EK51RD 501 MOUND 10 SUPPORT TREE 0180E BICKFLLNG SOL OCONIFER TREE PLANTING DETAIL NOT TO SCALE Re91Stro1lon ,:•.'-';--s- ANN • pp j 0 TUKWILA DUWAMISH GREEN RIVER TRAIL Sheet Title DETAILS HOUGH BECK & BAIRD INC. LANDSCAPE ARCNTECIURE RANN1R11G k URBAN DESIGN Approvals Number 920)0-3 Dote 8 1 gA 0r0*n .1 R IS C. FI B./J.H. Sheet Number L-14 .....2.V`''....." SEPA & SHORELINE SUBMITTAL 8/5/94 Check Reviews tt.U.. HI.KA. 0101/671 .n 3711 SECTION .A SECTION B LEGEND 6MIOLL■ MMU Manchu Z0U MrLL.MOAOMOMMMi iOYs(w) L►.t..MMG rmenc1OMZOI (s,) SECTION D LLL SECTION E .5 1 t 1 I CI O G J_ w (1) 0 O. 0 D: a I. .Wall, r. 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