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Home My WebLink AboutPermit L92-0015 - TEXACO ENVIRONMENTAL SERVICES - TEXACO UNDERGROUND TANK / SEPAl92-0015 13435 interurban avenue south texaco k3; • January 5, 1995 Mr. Jack Pace Senior Planner City of Tukwila 6300 Southcenter Boulevard, Suite 100 Tukwila, Washington 98188 RECEIVED JAN 1 0 1995 CO MMUNITY DEVELOPMENT SECOR /ill['1'!t(!llUllr "!/ 111Cn1 /)(1(11('0 DRAFT SUBJECT: SITE STATUS REPORT FOR FORMER TEXACO FACILITY NO. 63- 232 -0281, 13435 INTERURBAN AVENUE SOUTH, TUKWILA, WASHINGTON (SECOR Job No. 00111 - 051 -01) Mr. Pace: SECOR International Incorporated (SECOR) is pleased to submit this second quarter 1994 status report for the above referenced site on behalf of Texaco Environmental Services (TES). SECOR has been contracted by TES to install, operate, and maintain a groundwater remediation system at the site. Additionally, SECOR performs quarterly groundwater sampling of monitoring wells located on the site. CURRENT STATUS SECOR conducted quarterly groundwater sampling activities on May 26, 1994. No petroleum -like sheen was observed at any of the monitoring wells during groundwater sampling activities. However, slight petroleum -like odors were observed at all of the monitoring wells with the exception of MW -3. Current quarterly monitoring data were evaluated relative to the Washington State Model Toxics Control Act Cleanup Regulation (MTCA) Method A groundwater cleanup standards (WAC 173 - 340 -720). Groundwater analytical results for the May 1994 sampling event and their comparison to the previous quarterly sampling event indicate the following: • Samples from MW -1 and MW -2 (Figure 1) contained benzene above the MTCA Method A cleanup level. The benzene concentration in the sample from MW -2 is 10% of the level detected in February 1994. TX23017.LTR/1 01/05/95 11:49am • The concentration of benzene in MW -8 has decreased to below cleanup levels since the February 1994 sampling event. 11040 Main ,5'treet, Suile 240, Bellevue, 11 -;1 98004 -6320 (206) 646 -0280 (206) 646 -0283 FAX Mr. Jack Pace January 5, 1995 Page 2 TX23017.LTR/2 01/05/95 11:49am DRAFT • The concentration of total xylenes in MW -2 have decreased to below cleanup levels since the February 1994 sampling event. • Samples from MW -3 and MW -6 contained no constituents above cleanup levels. This is consistent with the prior quarterly sampling event. The installation of the groundwater remediation system has been completed. The system consists of two components. The first component is a groundwater extraction and treatment system. Groundwater is pumped from wells MW -5 and MW -7 (Figure 1) to a Shallow Tray, Inc. air stripper (Model 113) by two Grundfos Redi -Flo submersible pumps. Volatile petroleum compounds are partitioned into the vapor phase as the groundwater is subjected to forced air as it cascades through the tray system. The volatile components are discharged into the atmosphere through an emissions stack under Puget Sound Air Pollution Control Agency ( PSAPCA) Registration Number 10590. Treated groundwater is discharged to the METRO sanitary sewer system under Discharge Authorization (DA) Number 358. The second component of the groundwater remediation system is a vapor extraction system (VES). A vacuum is imparted on the vadose zone at wells MW -5, MW -7, and a vapor extraction lateral located on the east side of the property (Figure 1) with the use of a Rotron 505 regenerative blower. The extracted soil gases are discharged through an emissions stack within the equipment compound under PSAPCA Registration Number 17839. The Grundfos Redi -Flo pump in well MW -5 produces an average groundwater extraction rate of 0.79 gallons per minute (gpm) while well MW -7 produces an average of 1.32 gallons per minute. Approximately, 22,815 gallons of groundwater have been extracted from well MW -7 and treated by the system from system start -up to August 1, 1994. If an average influent concentration of 1,750 pg/L TPH -G is assumed, then approximately 3.3 pounds of gasoline range hydrocarbons have been removed from the subsurface at well MW -7. Approximately, 15,157 gallons of groundwater have been extracted from well MW -7 and treated by the system from system start -up to August 1, 1994. If an average influent concentration of 185 pg/L is assumed, then approximately 0.23 pounds of gasoline range hydrocarbons have been removed from the subsurface at well MW -5. The vapor extraction system produces an average vacuum of 28 inches of water at wells MW- 5, MW 7, and MW -8. The lack of a vacuum gauge prevents the determination of the vacuum at the vapor extraction lateral. Approximately 0.22 to 1.08 pounds of gasoline per day are removed from the subsurface by the vapor extraction system. An estimated 32.5 pounds of gasoline range hydrocarbons have been removed from the subsurface by the VES from system startup to August 1, 1994. Mr. Jack Pace January 5, 1995 Page 3 PLANNED ACTIVITIES SECOR will continue to operate and maintain conduct quarterly groundwater sampling. If you have any questions concerning this report, the undersigned at (206) 646 -0280. Sincerely, SECOR International Incorporated Thomas M. Vaughn Project Environmental Scientist TX23017.LTR/3 01/05/95 11:49am DRAFT the groundwater remediation system and please do not hesitate to contact either of Gerald J. Portele Principal -in- Charge May 7, 1993 Environmental Impact Statement ENV - SERVICE STATIONS Site Status Report, Texaco Facility #63- 232 -0281 13435 Interurban Avenue South, Tukwila, Washington Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 Dear Ms. Shefrin: Texaco Environmental Services (TES) is submitting this first quarter 1993 status report for the above referenced site. Previous status reports for this site were submitted by SEACOR (February 24, 1993) and Environmental Science and Engineering (July 9, 1992 and April 8, 1992). If additional copies of these previous status reports is desired, please contact me at your convenience. CURRENT STATUS Permits Texaco Refining and Marketing Inc The Metropolitan Municipality of Seattle (Metro) has issued a permit for discharge of treated groundwater from the site. The Puget Sound Air Pollution Control Agency (PSAPCA) has issued a permit for the discharge of vapors to the atmosphere from a vapor extraction system. The City of Tukwila has issued a permit for a sanitary sewer connection. Although these permits have been issued, to date no discharge has taken place. Site Demolition and Construction 3400 188th Street SW Suite 630 A Lynnwood WA 98037 MAY 1 O 1993 \" DE_•Vi. LOPi'viENT Texaco has sold the subject site to Southcenter OiI, Inc. of Kent, Washington. However, TES is performing soil and groundwater remediation. The former structure and most underground utilities were demolished and removed from the site during the first week of March 1993. Petroleum- impacted soil was excavated and transported off -site for disposal between March 8 through March 15, 1993. During this phase of work, approximately 1600 tons of impacted soil was removed from the site. The soil was transported to Roosevelt Regional Landfill, Klickitat County, Washington. The excavation activities were performed under the direction of a SEACOR geologist. Excavation and transportation equipment was operated by Lee Morse General Contractors. Following the excavation and backfilling operations, construction of a card -lock petroleum dispensing facility has been on- going. Lee Morse General Contractors is constructing the new facility under direct contract to South Center OiI Inc. Ms. Denny Shefrin page 2 May 7, 1993 PLANNED ACTIVITIES In conjunction with site redevelopment, SEACOR is proceeding with construction of the soil and groundwater remediation system. Several components of the remediation system installation are in progress, including the installation of below ground piping and installation of a groundwater recovery well. Should you have any additional questions or comments, please contact me at Texaco Environmental Services (206) 774 -6090. Sincerely, hx /te,v-efita- D. Mark Wells, P.E. Project Manager Texaco Environmental Services DMW:clj P: \DMW \INTERURB \TUKSTAT1.LTR AMBurke - LAChun - File- UCPFile- PNWRead pr: 9tt, April 27, 1994 tt Texaco Refining 3400 188th Street SW and Marketing Inc Suite 630 A Lynnwood WA 98037 ENV - SERVICE STATIONS Site Status Report, Texaco Facility #63- 232 -0281 13435 Interurban Avenue South, Tukwila, Washington Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 Dear Ms. Shefrin: LR -' oot Texaco Environmental Services (TES) is submitting this first quarter 1994 status report for the above referenced site. This letter summarizes recent remedial work performed at the site and discusses the progress of overall site remediation. CURRENT STATUS Site Demolition and Construction Texaco has sold the subject site to Southcenter Oil, Inc. of Kent, Washington. However, TES is performing soil and groundwater remediation. The former site improvements were demolished and removed from the site during the spring of 1993. Petroleum - impacted soil was excavated and transported off -site for disposal between March 8 through March 15, 1993. During this phase of work, approximately 1600 tons of impacted soil was removed from the site. Most of the impacted site soil was excavated and removed from the site. However, not all areas of impacted soil were assessible, and localized contamination remains in place. Excavated soil was transported to Roosevelt Regional Landfill, Klickitat County, Washington. The excavation activities were performed under the direction of SEACOR, TES' environmental consultant. Excavation and transportation equipment was operated by Lee Morse General Contractors. Following the excavation and backfilling operations, a card -lock petroleum dispensing facility was constructed by SouthCenter Oil. In conjunction with site redevelopment, SEACOR installed a soil and groundwater remediation system. Installation of the system is now complete. A report detailing the site construction activities and the remedial installation is being prepared. A copy will be submitted to you when available. Building on a Tradition of Quality 2 9 1994 ... ` N-T DD 2 91994 EVELop` -.+ .. �.....•.1,`.._ \. .... a... �.... '...Y r::i, ,.,+.......:..2. \:.,.alit' >: February 24, 1993 Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 SITE STATUS REPORT FOR TEXACO FACILITY 63- 232 -0281 13435 INTERURBAN AVENUE SOUTH, TUKWILA, WASHINGTON Dear Ms. Shefrin: Science and Engineering Analysis Corporation (SEACOR) is submitting this fourth quarter 1992 status report for the above referenced site on behalf of Texaco Environmental Services. A summary of the site background information from a status report prepared by Environmental Science and Engineering (dated July 9, 1992) is attached as Appendix A. CURRENT STATUS Permitting The Metropolitan Municipality of Seattle (Metro) has issued a permit for discharge of treated groundwater from the site. The Puget Sound Air Pollution Control Agency (PSAPCA) has issued a permit for the discharge of vapors to the atmosphere from a vapor extraction system. The City of Tukwila has issued a permit for a sanitary side sewer connection. Additional Investigation Additional soil sampling has been performed at the site and identified the presence of heavy hydrocarbons (oil) in soils west of the service station building. PLANNED ACTIVITIES Site Demolition and Construction TX9036.LTR/I 02/24/93 It CZ FEB 2.6 1993 COMMUNITY DEVELOPMENT .,.,.... �.,_._.-., ..................••..... r. a.. ..,��.r.en:.s•:.cac.:;.c•�Pr„•. .,; +y.3brdx s`�ra«.,t7 � .." SEACOR Science & 1 :// ,'ineerinq Altabwis (o pnratinlr Texaco is selling the subject site to Southcenter Oil of Kent, Washington for converting into a card -lock facility dispensing gasoline and diesel. Construction activities at the site will be performed by Lee Morse Construction, and are scheduled to begin on March 1, 1993. 71040 Main Street, Suile 240, Bellevue, 11 % ?1 98004 (206) 6.96 -0280 Ph (206) 646-0283 Fax Limited excavation of petroleum contaminated soil will be performed in conjunction with demolition and grading operations. The soil to be removed is currently beneath the building or adjacent to the canopy footing, and thus inaccessible at this time. The excavated soil will be transported to an appropriate facility for disposal. The subsurface portions of the remediation system will be installed during the overall site construction by Lee Morse Construction. The above ground portions of the remedial systems will be installed following site construction. The remedial system will begin operation after site construction is completed. If you have any questions regarding this status report, please do not hesitate to contact me at (206) 646 -0280 or Mr. Mark D. Wells at Texaco Environmental Services at (206) 774 -6090. Sincerely Science and Engineering Analysis Corporation e:4 ///( Mark W. Johns, Ph.D. Principal Scientist TX9036.LTR/3 02/24/93 APPENDIX A BACKGROUND During site assessment activities in June 1989, Applied Geotechnology, Inc. (AGI) drilled and sampled six soil borings adjacent to the four existing underground storage tanks and dispenser islands and installed four groundwater monitoring wells. Depth to groundwater stabilized at approximately 10 feet below ground surface (bgs) and the groundwater flow direction appeared to be to the northeast with a gradient of approximately 0.05 (1 vertical foot per 20 horizontal feet). Total petroleum hydrocarbon (TPH) concentrations in soil samples collected by AGI were below Washington Department of Ecology (Ecology) Model Toxics Control Act (MTCA) Method A cleanup levels. Only one soil sample, collected at a depth of 2.5 feet bgs in the boring adjacent to the 12,000 - gallon regular gasoline tank, contained benzene concentrations above the MTCA Method A cleanup level. A groundwater sample collected from a well located downgradient of the underground storage tanks had a benzene concentration greater than the MTCA cleanup level. A groundwater sample collected from a well located in the area of the southern dispenser island had a total xylenes concentration greater than the MTCA cleanup level. In October 1991, ESE purged and sampled the existing groundwater monitoring wells at the site prior to tank decommissioning activities. Depth to groundwater was determined at 11 to 15 feet bgs and groundwater flow direction was to the northeast. Only the concentrations of benzene in two groundwater samples and total xylenes in one groundwater sample were above MTCA Method A cleanup levels for these compounds. Four underground storage tanks containing regular, unleaded and premium - unleaded gasoline and diesel fuel were removed by ESE Corporation of Puyallup, Washington from the subject facility on November 5 and 6, 1991. Product lines servicing the dispensers were removed on November 13, 1991. Subsequent to tank decommissioning, approximately 2,000 cubic yards of soil were removed from the tank excavation and hauled to Fife Sand & Gravel for temporary storage. During overexcavation, an additional underground storage tank was discovered and removed. Verification soil samples were collected from beneath each tank and the concrete Vault and from the sidewalls of the excavation to demonstrate that soil containing petroleum hydrocarbons has been effectively removed. The underground storage tank excavation has been backfilled to grade. Hauling and Land Altering permits were obtained from the City of Tukwila (City). During overexcavation procedures, approximately 150,000 gallons of rain water accumulated in the tank excavation. In order to expedite backfilling of the excavation and provide a safe base for backfilling, the water was removed from the excavation on December 12 through 15, 1991, and again on February 25, 1992. Water was discharged to a Metro sewer located to the southwest of the site under verbal approval obtained on December 13, 1991 from Mr. Pat Broden of the City. A City inspector, Mr. Greg Villanueva, also verified that the connection to the sewer was appropriate. A sanitary side sewer permit was obtained from Mr. John Pierog of the City. During March of 1992, the groundwater monitoring wells previously installed by AGI were utilized by ESE for aquifer performance and vapor extraction testing. Aquifer performance test data were used to determine the production capabilities of the water - bearing unit beneath the site and to estimate the groundwater capture capabilities of groundwater wells at the site. Vapor extraction test data were used TXI0003.APP /I 02/24/93 TX10003.APP/2 02/21193 to evaluate the effectiveness of vapor extraction as a means of reducing concentrations of TPH and benzene, toluene, ethyl benzene and total xylenes (BTEX) in soil at the subject site remaining above MTCA Method A cleanup standards. Reduction of the aquifer performance and vapor extraction test data indicated that groundwater pump and treat remediation technology in combination with a soil vapor extraction system will be an effective means of reducing petroleum hydrocarbons concentrations in soil and groundwater at the subject site. On March 19 and 20, 1992, four additional wells were installed at the subject site by Mc- Garrett Drilling under the direction of an ESE geologist. The wells were installed with 4 -inch diameter PVC casing, to be used as combination groundwater extraction and soil vapor extraction wells in a future remediation system. On March 23, 1992, all of the groundwater wells existing on -site were sampled by ESE. The groundwater samples were analyzed for TPH as diesel (TPH -D), TPH as gasoline (TPH -G), and BTEX. Concentrations of TPH -G and BTEX above MTCA Method A cleanup levels were found in groundwater samples from four wells in the area of the southern dispenser island. These wells are planned to be remediated via groundwater and vapor extraction and treatment. Soil removed from the subject site and temporarily stored at Fife and Gravel has been transported to Roosevelt Regional landfill in Roosevelt, Washington for final disposal. ESE A CILCORP Company July 9, 1992 Dear Ms. Shefrin: Environmental Science & Engineering, Inc. RECEIVED JUL 1 51992 Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 BACKGROUND COMMUNITY DEVELOPMENT RE: Site Status Report for former Texaco Service Station #281 located at 13435 Interurban Avenue South in Tukwila, Washington On behalf of Texaco Environmental Services, Environmental Science & Engineering, Inc. (ESE) is submitting this second quarter 1992 status report for the former Texaco Service Station located at 13435 Interurban Avenue South in Tukwila, Washington. A status report for the third quarter of 1992 will be submitted by 10 October, 1992. During site assessment activities in June 1989, Applied Geotechnology, Inc. (AGI) drilled and sampled six soil borings adjacent to the four existing underground storage tanks and dispenser islands and installed four groundwater monitoring wells. Depth to groundwater stabilized at approximately 10 feet below ground surface (bgs) and the groundwater flow direction appeared to be to the northeast with a gradient of approximately 0.05 (1 vertical foot per 20 horizontal feet). Total petroleum hydrocarbon (TPH) concentrations in soil samples collected by AG1 were below Washington Department of Ecology (Ecology) Model Toxics Control Act (MTCA) Method A clean -up levels. Only one soil sample collected at a depth of 2.5 feet bgs in the boring adjacent to the 12,000 - gallon regular gasoline tank contained benzene concentrations above the MTCA Method A clean -up level. A groundwater sample collected from a well located down gradient of the underground storage tanks had a benzene concentration greater than the MTCA clean -up level. A groundwater sample collected from a well located in the area of the southern dispenser island had a total xylenes concentration greater than the MTCA clean -up level. In October 1991, ESE purged and sampled the existing groundwater monitoring wells at the site prior to tank decommissioning activities. Depth to groundwater was determined at 11 to 15 feet bgs and groundwater flow direction was to the northeast. Only the concentrations of benzene in two groundwater samples and total xylenes in one 17411 N.E. Union Hill Road, Suite 220 Redmond, WA 98052 Phone (206) 869 -8220 Fax (206) 867 -1366 LIZ - CO /s July 9, 1992 Ms. D. Shefrin /City of Tukwila page 2 groundwater sample were above MTCA Method A clean -up levels for these compounds. Four underground storage tanks containing regular, unleaded and premium unleaded gasoline and diesel fuel were removed by ESE Corporation of Puyallup, Washington from the subject facility on November 5 and 6, 1991. Product lines servicing the dispensers were removed on November 13, 1991. Laboratory analysis of soil samples indicated that total petroleum hydrocarbon concentrations above MTCA Method A clean -up levels were found adjacent to the premium unleaded gasoline and diesel fuel tanks and beneath the product piping adjacent to the pump island in closest proximity to the station building. Subsequent to tank decommissioning, approximately 2,000 cubic yards of soil were removed from the tank excavation and hauled to Fife Sand & Gravel for temporary storage. During overexcavation, an additional underground storage tank was discovered and removed. A portion of a cylindrical concrete vault was also discovered and removed. Verification soil samples were collected from beneath each tank and the concrete vault and from the sidewalls of the excavation to demonstrate that soil containing petroleum hydrocarbons has been effectively removed. The underground storage tank excavation has been backfilled to grade. Hauling and Land Altering permits were obtained from the City of Tukwila (City). During overexcavation procedures, approximately 150,000 gallons of rain water accumulated in the tank excavation. In order to expedite backfilling of the excavation and provide a safe base for backfilling, the water was removed from the excavation on December 12 through 15, 1991, and again on February 25, 1992. Water was discharged to a Metro sewer located to the southwest of the site under verbal approval obtained on December 13, 1991 from Mr. Pat Broden of the City. A City inspector, Mr. Greg Villanueva, also verified that the connection to the sewer was appropriate. A sanitary side sewer permit was obtained from Mr. John Pierog of the City. During March of 1992, the groundwater monitoring wells previously installed by AGI were utilized by ESE for aquifer performance and vapor extraction testing. Aquifer performance test data were used to determine the production capabilities of the water - bearing unit beneath the site and to estimate the groundwater capture capabilities of groundwater wells at the site. Vapor extraction test data were used to evaluate the effectiveness of vapor extraction as a means of reducing concentrations of TPH and benzene, toluene, ethylbenzene, and total xylenes (BTEX) in soil at the subject site remaining above MTCA Method A clean -up standards. Reduction of the aquifer performance and vapor extraction test data indicated that groundwater pump and treat Permitting July 9, 1992 Ms. D. Shefrin /City of Tukwila page 3 Remedial Action Plan CURRENT STATUS remediation technology in combination with a soil vapor extraction system will be an effective means of reducing petroleum hydrocarbons concentrations in soil and groundwater at the subject site. On March 19 and 20, 1992, four additional wells were installed at the subject site by Mc- Garrett Drilling under the direction of an ESE geologist. The wells were installed with 4 -inch diameter PVC casing, to be used as combination groundwater extraction and soil vapor extraction wells in a future remediation system. On March 23, 1992, all of the groundwater wells existing on site were sampled by ESE. The groundwater samples were analyzed for TPH as diesel (TPH -D), TPH as gasoline (TPI -I -G), and BTEX. Concentrations of TPH -G and BTEX above MTCA Method A clean -up levels were found in groundwater samples from four wells in the area of the southern dispenser island. These wells are planned to be remediated via groundwater and vapor extraction and treatment. Soil removed from the subject site and temporarily stored at Fife Sand and Gravel has been transported to Roosevelt Regional landfill in Roosevelt, Washington for final disposal. The Metropolitan Municipality of Seattle (Metro) has issued a permit for discharge of treated groundwater from the site to the sanitary sewer system. The Puget Sound Air Pollution Control Agency (PSAPCA) has issued a permit for venting of soil vapors produced by an on -site vapor extraction system to the atmosphere. A sanitary side sewer connection permit application is in the final stages of review at the City of Tukwila. ESE has prepared a remedial action plan (RAP) for Texaco Environmental Services (Texaco), detailing the remediation system proposed for the subject site. The RAP is currently being review by Texaco. July 9, 1992 Ms. D. Shefrin /City of Tukwila page 4 • . PLANNED ACTIVITIES Remediation System Installation After being reviewed by Texaco, the RAP will be implemented as soon as practical, and soil and groundwater remediation will be initiated. If you have any questions regarding this status report, please do not hesitate to contact me at (206) 869 -8220. Sincerely, ENVIRONMENTAL SCIENCE & ENGINEERING, INC. Michael Meyer, M.S. Senior Staff Geologist . J: \PROJECTS \92 - 7162 \CITYSr3.RPT A CILCORP Company April 8, 1992 c Environmental Science & Engineering, Inc. Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 RE: Site Status Report for former Texaco Service Station #281 located at 13435 Interurban Avenue South in Tukwila, Washington Dear Ms. Shefrin: BACKGROUND 17411 N.E. Union Hill Road, Suite 220 Redmond, WA 98052 MOM On behalf of Texaco Environmental Services, Environmental Science & Engineering, Inc. (ESE) is submitting this first quarter 1992 status report for the former Texaco Service Station located at 13435 Interurban Avenue South in Tukwila, Washington. A status report for the second quarter of 1992 will be submitted by 10 July, 1992. During site assessment activities in June 1989, Applied Geotechnology, Inc. (AGI) drilled and sampled six soil borings adjacent to the four existing underground storage tanks and dispenser islands and installed four groundwater monitoring wells. Depth to groundwater stabilized at approximately 10 feet below ground surface (bgs) and the groundwater flow direction appeared to be to the northeast with a gradient of approximately 0.05 (1 vertical foot per 20 horizontal feet). Total petroleum hydrocarbon (TPH) concentrations in soil samples collected by AGI were below Washington Department of Ecology (Ecology) Model Toxics Control Act (MTCA) Method A clean -up levels of 100 milligrams per kilogram (mg /kg) for gasoline and 200 mg /kg for diesel fuel. Only the soil sample collected at a depth of 2.5 feet bgs in the boring adjacent to the 12,000 - gallon regular gasoline tank contained benzene concentrations above the MTCA Method A clean -up level of 0.5 mg /kg. The groundwater sample collected from Well MW -3, located down gradient of the underground storage tanks, had a benzene concentration of 22 micrograms per liter (ug /1), which is greater than the MTCA clean -up level of 5 ug /l. The groundwater sample collected from Well MW -1 had a total xylenes concentration of 39 ug /1, greater than the MTCA clean -up level of 20 ug /1. In October 1991, ESE purged and sampled the existing groundwater monitoring wells at the site prior to tank decommissioning activities. Depth to groundwater was determined APR 141992 CITY OF 1 UKWILA PLANNING DEPT. Phone (206) 869 -8220 Fax (206) 867 -1366 9a- - Lq2 -oo1E April 8, 1992 Ms. D. Shefrin /City.of Tukwila page 2 • at 11 to 15 feet bgs and groundwater flow direction was to the northeast. Only the concentrations of benzene (13 and 300 ug /1) in two groundwater samples and total xylenes in one groundwater sample (70 ug /1) were above MTCA Method A clean -up levels for these compounds (5 and 20 ug /l, respectively). Four underground storage tanks containing regular, unleaded and premium unleaded gasoline and diesel fuel were removed by ESE Corporation of Puyallup, Washington from the subject facility on November 5 and 6, 1991. Product lines servicing the dispensers were removed on November 13, 1991. Laboratory analysis of soil samples indicated that total petroleum hydrocarbon concentrations above MTCA Method A clean -up levels were found adjacent to the premium unleaded gasoline and diesel fuel tanks and beneath the product piping adjacent to the pump island in closest proximity to the station building. Subsequent to tank decommissioning, approximately 2,000 cubic yards of soil were removed from the tank excavation and hauled to Fife Sand & Gravel for temporary storage. During overexcavation, an additional underground storage tank was discovered and removed. A presumed dry well was also discovered and removed. Verification soil samples were collected from beneath each tank and dry well and from the sidewalls of the excavation to demonstrate that soil containing petroleum hydrocarbons has been effectively removed. The underground storage tank excavation has been backfilled to grade. Hauling and Land Altering permits have been obtained from the City of Tukwila (City). During overexcavation procedures, approximately 150,000 gallons of rain water accumulated in the tank excavation. In order to expedite backfilling of the excavation and provide a safe base for backfilling, the water was removed from the excavation on December 12 through 15, 1991, and again on February 25, 1992. Water was discharged to a Metro sewer located to the southwest of the site under verbal approval obtained on December 13, 1991 from Mr. Pat Broden of the City. A City inspector, Mr. Greg Villanueva, also verified that the connection to the sewer was appropriate. A sanitary side sewer permit was obtained from Mr. John Pierog of the City. April 8, 1992 Ms. D. Shefrin /City of Tukwila page 3 Groundwater Sampling Permitting CURRENT STATUS Aquifer Performance and Vapor Extraction Testing During March of 1992, the groundwater monitoring wells previously installed by AGI were utilized by ESE for aquifer performance and vapor extraction testing. Aquifer performance test data were used to determine the production capabilities of the water - bearing unit beneath the site and to estimate the groundwater capture capabilities of groundwater wells at the site. Vapor extraction test data were used to evaluate the effectiveness of vapor extraction as a means of reducing concentrations of TPH and benzene, toluene, ethylbenzene, and total xylenes (BTEX) in soil at the subject site remaining above MTCA Method A clean -up standards. Reduction of the aquifer performance and vapor extraction test data indicated that groundwater pump and treat remediation technology in combination with a soil vapor extraction system will be an effective means of reducing petroleum hydrocarbons concentrations in soil and groundwater at the subject site. Groundwater /Soil Vapor Extraction Well Installation On March 19 and 20, 1992, four additional wells were installed at the subject site by Mc- Garrett Drilling under the direction of an ESE geologist. The wells were installed with 4 -inch diameter PVC casing, to be used as combination groundwater extraction and soil vapor extraction wells in a future remediation system. On March 23, 1992, all of the groundwater wells existing on site were sampled by ESE. The groundwater samples were analyzed for TPH as diesel (TPH -D), TPH as gasoline (TPH -G), and BTEX. Wells for which groundwater samples were above MTCA Method A clean -up standards for TPH -G and /or BTEX are tentatively planned to be remediated via groundwater and vapor extraction and treatment. Application has been made to the Metropolitan Municipality of Seattle (Metro) for a two -year discharge permit to the sanitary sewer system for groundwater that will be treated by the remediation system. Permit applications are currently being completed for the Puget Sound Air Pollution Control Agency and the City (sanitary side sewer connection). April 8, 1992 Ms:; D. Shefrin /City of Tukwila page 4 • PLANNED ACTIVITIES Soil Disposal Soil removed from the subject site is currently stored at Fife Sand and Gravel in Puyallup, Washington. This soil has been approved for disposal at Roosevelt Regional landfill in Roosevelt, Washington. Transport of the soil is expected to occur within the next 30 days. Remediation System Installation ESE will prepare a remedial action plan (RAP) for Texaco Environmental Services, detailing the remediation system proposed for the subject site. Upon approval by Texaco, the RAP will be implemented as soon as practical, and soil and groundwater remediation will be initiated. If you have any questions regarding this status report, please do not hesitate to contact me at (206) 869 - 8220. Sincerely, ENVIRONMENTAL SCIENCE & ENGINEERING,. INC. Michael Meyer Senior • Staff Geologist WAC 197 -11 -970 Description of Proposal Texaco underground storage tank groundwater remediation. Proponent Environmental Science and Engineering, Inc. Contact: Mark Brearley - (206) 869 -8220 Location of Proposal, including street address, if any 13435 Interurban Avenue Lead Agency: City of Tukwila File No. SEPA92 - 005 The lead agency for this proposal has determined that it 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. x (X There is no comment period for this DNS [j This DNS is issued 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. Responsible Official Rick Beeler Position /Title Planning Director Address Date FM.DNS DETERMINATION OF NONSIGNIFICANCE 6200 Southcenter Boulevard, Signature Tukwila A 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 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 Planning Department. Phone 433 -1846 • 0211.001111 CNMW February 6, 1992 Dear Ms. Shefrin: 2QB -867-1366 ESE 2064 *1366 Mark Bre ey, Ph.D. Project Geologist Environmental Science & Engineering, Inc. Ms, Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 RE: Quarterly Reporting Requirements for Environmental Work to be Conducted at Former Texaco Service Station Located at 13435 Interurban Avenue South in Tukwila, W ,hingtvn Pursuant to our telephone conversation today, Environtnental Science & Engineering, Inc. (ESE) is submitting this letter to satisfy your requirements for quarterly reporting at the referenced facility. Each quarterly report will discuss and summarize activities conducted during the previous quarter, work in progress during the current quarter and work planned for the future. These activities will include documentation of field work, permitting and other reporting to Washington State Department of Ecology. ESE proposes to submit the first quarterly report by April 15, 1992. If you have any questions concerning this matter, please do not hesitate to contact me at (206) 869 -8220. Sincerely, ENVIRONMENTAL SCIENCE & ENGINEERING, INC. cc: Mr. D. Mark Wells /Texaco 701 P02 FEB OS '92 16:19 A CILCORP Company January 8, 1992 Environmental Science & Engineering, Inc. Ms. Denny Shefrin City of Tukwila 6300 Southcenter Boulevard Tukwila, Washington 98188 Dear Ms. Shefrin: Following our telephone conversation of December 26, 1991, a d on behalf of Texaco Environmental Services, Environmental Science & Engineering Inc. (ESE) is submitting this status report and State Environmental Policy Act (SEPA) .hecklist for your review and approval. During site assessment activities in June 1989, Applied Geotec nology, Inc. (AGI) drilled and sampled six soil borings adjacent to the four existing unde • round storage tanks and dispenser islands and installed four groundwater monitoring w • lis. Depth to groundwater stabilized at approximately 10 feet below ground •urface (bgs) and the groundwater flow direction appeared to be to the northeast wit a gradient of approximately 0.05 (1 vertical foot per 20 horizontal feet). Total petroleum hydrocarbon (TPH) concentrations in soil sa ples collected by AGI were below Washington Department of Ecology (Ecology) Mo • el Toxics Control Act (MTCA) Method A clean -up levels of 100 milligrams per kilog am (mg /kg) for gasoline and 200 mg /kg for diesel fuel. Only the soil sample collected t t a depth of 2.5 feet bgs in the boring adjacent to the 12,000-gallon regular gasoline tan contained benzene concentrations above the MTCA Method A clean -up level of 1.5 mg /kg. The groundwater sample collected from Well MW -3, located down gradient of the underground storage tanks, had a benzene concentration of 22 micrograms per liter (ug /1), which is greater than the MTCA clean -up level of 5 ugj 1. The groundwater sample collected from Well MW -1 had a total xylenes concentration of 39 ug /1, greater than the MTCA clean -up level of 20 ug /1. 17411 N.E. Union 11111 Road, Suite 220 BACKGROUND Redmond, WA 98052 Ph AEM RE: Site Status Report for former Texaco Service Station #2:1 located at 13435 Interurban Avenue South in Tukwila, Washington (C fr*s`11e ) 1 P A - o5 F AN 0 9 1992 CITY - OF TUKWILA ,,� (20PEv�{ 11h1G DEPT• (206) 367 -1366 January 8, 1992 Ms. D. Shefrin /City of Tukwila page 2 Groundwater Sampling Tank Decommissioning Dewatering CURRENT STATUS In October 1991, ESE purged and sampled the existing groundwater monitoring wells at the site prior to tank decommissioning activities. Depth to groundwater was determined at 11 to 15 feet bgs and groundwater flow direction was to the northeast. Only the concentrations of benzene (13 and 300 ug /1) in two groundwater samples and total xylenes in one groundwater sample (70 ug /1) were above MTCA Method A clean -up levels for these compounds (5 and 20 ug/I, respectively). Four underground storage tanks containing regular, unleaded and premium unleaded gasoline and diesel fuel were removed by ESE Corporation of Puyallup, Washington from the subject facility on November 5 and 6, 1991. Product lines servicing the dispensers were removed on November 13, 1991. Laboratory analysis of soil samples indicated that total petroleum hydrocarbon concentrations above Model Toxics Control Act (MTCA) Method A clean -up levels were found adjacent to the premium unleaded gasoline and diesel fuel tanks and beneath the product piping adjacent to the pump island in closest proximity to the station building. Subsequent to tank decommissioning, approximately 1,000 cubic yards of soil have been removed to date from the tank excavation and hauled to Fife Sand & Gravel for temporary storage. Final disposition of the excavated petroleum impacted soil is yet to be determined. During overexcavation, an additional underground storage tank was discovered and remove& A presumed dry well was also discovered and removed. Verification soil samples were collected from beneath each tank and dry well and from the sidewalls of the excavation to demonstrate that soil containing petroleum hydrocarbons has been effectively removed. The underground storage tank excavation has been currently backfilled to 3 to 5 feet bgs. Hauling and Land Altering permits have been obtained from the City of Tukwila (City). During overexcavation procedures, approximately 150,000 gallons of rain water accumulated in the tank excavation. In order to expedite backfilling of the excavation .' ��.:+.. January 8, 1992 Ms. D. Shefrin /City of Tukwila page 3 and provide a safe base for backfilling, the water was removed from the excavation on December 12 through 15, 1991. Water was discharged to a Metro sewer located to the southwest of . the site under verbal approval obtained on December 13, 1991 from Mr. Pat Broden of the City. A City inspector, Mr. Greg Villanueva, also verified that the connection to the sewer was appropriate. A sanitary side sewer permit has been obtained from Mr. John Pierog of the City. _ 60/ 61 /.rcO/ufil (2 &t "'rt•OCe. a ft P / �,dtz,� . PLANNED ACTIVITIES An estimated additional 200 cubic yards of soil will be removed from the area of the dispenser islands. Verification soil samples will be collected from the base and sides of the excavation to demonstrate that soil containing petroleum hydrocarbons has been removed. The resulting excavation and the existing tank excavation will be backfilled with clean import material and resurfaced. The objective of the soil removal is to eliminate as much of the potential source of contamination to the groundwater as possible. Additional lateral characterization of petroleum hydrocarbons in groundwater involving drilling and well installation is planned. Groundwater remediation will occur once the extent of contamination is known. If you have any questions regarding this status report, please do not hesitate to contact me at (206) 869 -8220. Sincerely, ENVIRONMENTAL SCIENCE & ENGINEERING, INC. Mark Brearley, Ph.D Project Geologist s December 27, 1991 Dear Mr. Johnson: CITY OF TUKWILA 6200 SOUTHCENTER BOULEVARD, TU WILA. WASHINGTON 98188 Wes W. Johnson ESE Corporation 11011 Waller Road East Tacoma, WA 98446 f VILOPMENT FILE SUBJECT: Texaco /Tukwila, 13435 Interurban Avenue South Utility Permit Application (PC No. 91- 069 -U) In accordance with our previous conversations concerning the subject project, the Public Works Department is approving your application for two additional permits for the work involved. Please contact Denise Millard, Permit Coordinator, at 431 -3672 to have the following permits prepared for pickup: 1. Land Altering (Grade and Fill) Permit (Permit Fee = $156.00) The above fee was calculated using 2,000 cubic yards as the measure of land altering activity and breaks down as follows: Plan Review Fee - $ 30.00 Grading Permit Fee - 126.00 Total $156.00 2. Hauling Permit (Permit Fee = $25.00) The following documents shall be provided prior to any further hauling activity: A. A copy of the Certificate of Insurance coverage (minimum of $1,000,000) naming the City of Tukwila as insured. B. A $2,000 bond made out to the City for possible property damages caused by activities. C. A map which shows the haul route. C PHONE: 12061433.1800 Gary L. tanDasen. Mayor Please remember that before you can commence any of the above activities, you need an environmental clearance from our Planning Division. If you have any additional questions or if I can be of further assistance, please call me at 433 -0179. Sincerely, John A. Pie g, P.E. Associate Engineer Public Works Department xc: Greg Villanueva, City Utilities Inspector Permit Coordinator Development File: Texaco /Tukwila Read File JP /amc:10:texaco Applicant/Authorized Agent Signature: re. Contact Person (print name: /-7 w. �/a yivsON s ° ,� Print Name:' �'✓ h! /DyNfn /✓ ESE coR.° Addre / /O // /,/ALLF'? RD / TArO/>A Fel Date: A2 Phone: 5-35--3//oz, j Phone: .5736 3/42., Date Application Accepted: /,2 _ 9 ' - 9/ Date Application Expires: 6— f... CITY OF TUKWILA Central Permit System - Engineering Division 6300 Southcenter Blvd., Tukwila, WA 98188 Phone: (206) 433 -0179 OJEC NF:.n:RMATIC Engineer: :W ATE R< >REFUNDIBILLI :RMI ><> < >?< . ........ QUES > 3ERV1 3l LEIN ❑ Water E SCRIP:TION;` ❑ Multiple- Family Dwelling No. of Units: CommerciaVlndustrial MISCELLANEOUS HEREB.:YCERTIF: Site Address: /31`3.5 z'.✓rc�v,4o o y • Name of Project: cof re„<,,„ 4 Property Owner: TEXACO .& - • : - 4 /c Street 3�o 498 sh s -' E 7 Sr✓ Name: Street Name: Street ❑ Sewer ❑ Hotel ❑ Motel ❑ Office UTILITY PERMfl APPLICATION 30 A''/) sz,/ ' 2.?/) 1 Street Address: /7.y/ /YE v /✓r�,s/ .�✓/ L Contractor: Street Address: /io // A,/,o /iF-P fo od - -- King County Assessor Account Number: Dee 300 — G10.8 O Channelization/Striping /Signing ❑ Curb Cut/Access /Sidewalk ❑ Fire Loop /Hydr. (main to vault) — No.: _ Sizes: ❑ Flood Zone Control ® Grade /Fill 2 cubic, yards 2 Hauling ❑ Landscape Irrigation ❑ Moving an Oversized Load ❑ Sanitary Side Sewer— No.: ❑ Sewer Main Extension Private ❑ Public ❑ ❑ Metro ❑ Standby AYE* ✓u6 ❑ Single - Family Residential Somers ❑ Duplex ❑ Apartments ❑ Triplex ❑ Condominiums ❑ Warehouse ❑ Church ❑ Retail ❑ Manufacturing ❑ Hospital ® Other: 74/L 44/SD.4/4/ E ❑ New Building a Remodel/ Square footage of original building space: Square Additiern Footage: Square footage of additional building space: King County Assessor's valuation of existing structures: $ /.28300 Valuation of work to be done: $ A:PP ::'!CATI D PLAN CHECK NUMBER: 9/ 4■9 -- Tv ry✓ /4 4 Phone No.: �2 ) 77/ ^ S76 . City /State/Zip: /y~0,00 1,,/4 7BO37 Phone No.: (, p „/Q - Ci ty /State /Zip: , y ,, t/a ✓4 pBeS� Phone No.: City /State /Zip: 7f f tri o QBs ❑ Storm Drain ❑ Street Use C Water Main Extension Private ❑ Public ❑ ❑ Water Meter / Exempt: — No.: Sizes Deduct ❑ Water Only ❑ ❑ Water Meter/ Permanent — No _ Sizes ❑ Water Meter/ Temporary: — No.: Sizes ❑ Other: Phone No.: City /State /Zip: Phone No.: City /State/Zip: r ❑ Other: ❑ School /College /University SA 'CO 09/18/90 'CONTROL # 91 -069 -U PERMIT # SITE ADDRESS: 13435 Interurban Ave. S. Tukwila PROJECT NAME: Texaco /Tukwila NAME OF OWNER: Texaco Environ. Services PHONE: (206) 771 -5162 ADDRESS: 3400 188th St. SW # 630 Lynnwood WA ZIP: 98037 CONTRACTOR: ESE Corp. PHONE: (206) 535 -3112 ADDRESS: 11011 Waller Road East Tacoma, WA ZIP: 98446 FEES PERMIT FEE PLAN CHECK FEE CITY OF TUKWILA 6300 SOUTHCENTER BLVD. TUKWILA, WA 98188 LAND ALTERING PERMIT [ ) LAND ALTERING:CUT (Cubic Yards) FILL (Cubic Yards) TOTAL 2,000 C. CONDITIONS: N/A THE UNDERSIGNED HEREBY APPLIES FOR PERMISSION TO: proceed per approval letter dated 12/27/91 THE APPLICANT MUST NOTIFY CITY INSPECTOR GREG VILLANUEVA ((206) 433 -0179) OF COMMENCEMENT AND COMPLETION OF WORK AT LEAST 24 HOURS IN ADVANCE. APPROVED BY: PERMIT NOT SIGNED -OFF BECAUSE $ 126.00( $ 30.00(00 $ (000/386.904) RECEIPT TOTAL $ 156.00 APPLICABLE SECTIONS OF THE CITY OF TUKWILA MUNICIPAL CODE. WE AGREE THAT THE CITY OF TUKWILA SHALL BE HELD HARMLESS FROM ALL OR ANY CLAIMS ARISING AS A RESULT OF THIS PROJECT. PERMITS WHICH HAVE LAPSED BEYOND THE PERMIT EXPIRATION DATE SHALL REQUIRE A REAPPLICATION AND REISSUANCE OF THE PERMIT THROUGH THE CITY OF TUKWILA AT AN ADDITIONAL FEE (433 -0179) APPLICANT'S SIGNATURE TITLE ADR R, SE , CITY OF TUKWILA I HEREBY CERTIFY THAT THE PERMIT HOLDER WHOSE NAME AND ADDRESS APPEARS ON THIS RECORD HAS SATISFACTORILY MET THE STANDARDS AND CONDITIONS FOR THE PROJECT APPROVED HEREIN. FIELD INSPECTION DATE CITY INSPECTOR RECEIVED BY ISSUE DATE: EXPIRATION DATE: DATE ACCEPTS THIS PERMIT AND AGREES TO ABIDE BY ALL INITIALS DATE cc: APPLICANT INSPECTOR CITY SHOPS BUILDING OFFICIAL FINANCE DEPT.(IF APPLICABLE) FIRE DEPT. (IF APPLICABLE) "CONTROL # 91 -069 -U PERMIT # [XX] HAULING [ ] MOVING AN OVERSIZED LOAD + + THE UNDERSIGNED HEREBY APPLIES FOR PERMISSION TO PERFORM HAULING PER ATTACHED MAP IN ACCOR- DANCE WITH THE FOLLOWING CONDITIONS: 1) FLAGGING, SIGNING AND CONING SHALL BE IN ACCORDANCE WITH MUTCD FOR TRAFFIC CONTROL; 2) CONTRACTOR SHALL PROVIDE CERTIFIED FLAGMEN FOR TRAFFIC CONTROL; 3) SWEEP OR OTHERWISE CLEAN STREETS TO THE SATISFACTION OF PUBLIC WORKS EACH NIGHT AROUND HAULING ROUTE (NO FLUSHING IS ALLOWED); 4) NOTIFY CITY INSPECTOR (433 -0179) BEFORE 12:00 NOON ON FRIDAY PRECEDING ANY WEEKEND WORK; 5) PERMIT IS VALID BETWEEN THE WEEKDAY HRS OF 7:00 AM AND 3:30 PM ONLY; 6)CLEAN AND REMOVE DEBRIS FROM CITY CATCH BASINS IN AND AROUND HAULING ROUTE; 7) PROVIDE ADEQUATE TEMPORARY ACCESS AS NOT TO INTERFERE WITH OTHER VEHICLE MOVEMENT OR CAUSE TRUCKS TO TRAVEL OVER CURBS; 8) ALL VEHICLES MUST MAKE COMPLETE STOP PRIOR TO ENTERING PUBLIC RIGHT -OF -WAY. ADDITIONAL REQUIREMENTS: CITY OF TUKWILA 6300 SOUTHCENTER BLVD. TUKWILA, WA 98188 ANTICIPATED TIME OF START: END TIME: ISSUE DATE: EXPIRATION DATE: THE APPLICANT MUST NOTIFY CITY INSPECTOR GREG VILLANUEVA ((206) 433 -0179) OF COMMENCEMENT AND COMPLETION OF WORK AT LEAST 24 HOURS IN ADVANCE. SITE ADDRESS: 13435 Interurban Ave. S. Tukwila PROJECT NAME: Texaco /Tukwila NAME OF OWNER: Texaco Environ. Services PHONE: (206) 771 -5162 ADDRESS: 3400 188th St. SW # 630 Lynnwood WA ZIP: 98037 CONTRACTOR: ESE Corp. PHONE: (206) 535 -3112 ADDRESS: 11011 Waller Road East Tacoma, WA ZIP: 98446 FEES PLAN CHECK FEE $ 10.00 (000/345.830) INSPECTION FEE $ 15.00 (000 /342.400) RECEIVED BY TOTAL $ 25.00 RECEIPT # DATE ACCEPTS THIS PERMIT AND AGREES TO ABIDE BY ALL APPLICABLE SECTIONS OF THE CITY OF TUKWILA MUNICIPAL CODE. WE AGREE THAT THE CITY OF TUKWILA SHALL BE HELD HARMLESS FROM ALL OR ANY CLAIMS ARISING AS A RESULT OF THIS PROJECT. PERMITS WHICH HAVE LAPSED BEYOND THE PERMIT EXPIRATION DATE SHALL REQUIRE A REAPPLICATION AND REISSUANCE OF THE PERMIT THROUGH THE CITY OF TUKWILA AT AN ADDITIONAL FEE (433 -0179) APPLICANT'S SIGNATURE TITLE APPROVED BY: cc: APPLICANT INSPECTOR CITY SHOPS FINANCE DEPARTMENT POLICE DEPARTMENT I HEREBY CERTIFY THAT THE PERMIT HOLDER WHOSE NAME AND ADDRESS APPEARS ON THIS RECORD HAS SATISFACTORILY MET THE STANDARDS AND CONDITIONS FOR THE PROJECT APPROVED HEREIN. FIELD INSPECTION DATE CITY INSPECTOR PERMIT NOT SIGNED -OFF BECAUSE INITIALS DATE e Municipality of Metropolitan Seattle Exchange Building • 821 Second Ave. • Seattle, WA 98104 -1598 • (206) 684 -2100 December 3, 1991 CERTIFIED MAIL RETURN RECEIPT REQUESTED Sherry Ducken Environmental Science & Engineering, Inc. 17411 N.E. Union Hill Road, Suite 220 Redmond, WA 98052 Approval to Discharge Recovered Groundwater Dear Ms. Ducken: Sincerely, We have received your request to discharge approximately 200,000 gallons of contaminated groundwater into the sanitary sewer from a site located at 13435 Interurban Avenue South, Tukwila, Washington. The subject discharge is the accumulation of contaminated groundwater from an open excavation resulting from the removal of an underground storage tank. Based on the analytical results of the groundwater samples that you submitted we have decided it is not necessary to issue a permit or Discharge Authorization for this temporary project, instead, this letter will serve as authorization to discharge recovered groundwater at the above site. If a visible sheen or pronounced odor develops, or turbidity significantly increases while discharging to the sewer you must cease discharge immediately. Discharge may resume when analytical tests verify that the discharge meets Metro's discharge limits. As a condition of this authorization you must contact the City of Tukwila and comply with any requirements they may have for this type of activity. Metro Industrial Waste staff want to help you stay in compliance with our regulations. If you have any questions about your discharge, please do not hesitate to call me at 689 -3008. im Siffo d Industrial Waste Investigator Environmental Programs cc: Pat Broden, City of Tukwila Doug Hilderbrand, Metro JS2 /LS -DESE RECEIVED DEC - 5 1991 I -'U jnPS A. BACKGROUND 1. Name of proposed project, if applicable: Texaco Underground Storage Tank (UST) Soil /Groundwater Remediation - 13435 Interurban 2. Name of applicant: Texaco Environmental Services 3. Address and phone number of applicant and contact person: Mr. Mark Wells TEXACO ENVIRONMENTAL SERVICES 3400 188th Street SW Suite 630 Lynnwood, Washington 98037 (206) 771 -5162 Contact: Mark Brearley, ENVIRONMENTAL SCIENCE & ENGINEERING (206) 869 -8220 4. Date checklist prepared: January 2, 1992 5. Agency requesting checklist: City of Tukwila 6. Proposed timing or schedule (including phasing, if applicable): November 1991 through January 1992: Removal of USTs, excavation and transport of petroleum- impacted soil, dewatering of excavation, backfill of excavation. January through February 1992: CITY OF TUKWILA ENVIRONMENTAL (SEPA) CHECKLIST February 1992 through 1993: Groundwater pumping and treatment. MEM [ JAN 09 1992 CITY OF TUKWILA Qt- C-6-?+ 57 01E/ c 56PA- 92 -005 Excavation and transport of petroleum- impacted soil from beneath dispenser islands. Installation of groundwater remediation system. Does not apply. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Phase I and II site assessments were performed at the subject site by Applied Geotechnology, Inc., during the summer of 1989. These assessments included drilling and sampling of soil borings and groundwater monitoring wells on the subject site, with subsequent laboratory analysis of soil and groundwater samples for petroleum hydrocarbon concentrations. After the completion of field work, Environmental Science and Engineering, Inc. (ESE) will prepare a report summarizing tank removal and soil and groundwater remediation activities. This document will be submitted to the Washington Department of Ecology (WDOE). 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. None are pending. 10. List any government approvals of permits that will be needed for your proposal, if known. METRO Sanitary Sewer Discharge Permit Side Sewer Connection Permit (possibly required) Hauling Permit Land Altering Permit Fire Department Authorization Electrical Permit Water Well Start Cards from the Department of Ecology Notice of Construction permit from Puget Sound Air Pollution Control Agency 11. Give brief, complete description of your proposal, including the proposed uses and the site 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 subject property is a former gas station. Petroleum hydrocarbon concentrations above Washington State Clean -up Level Guidelines (SCLGs) are present in the soil and groundwater under the site. As required by WDOE clean up regulations, ESE proposes to conduct soil and groundwater remediation, as follows: Soil Remediation. Excavate and remove soil above the water table containing components of residual petroleum hydrocarbons. Install a soil !+ venting system; consisting of vapor extraction wells or piping within a soil stockpile, a vapor extraction vacuum unit and an internal combustion unit to burn off the volatile vapors. Groundwater Remediation. Capture and treat groundwater containing dissolved petroleum hydrocarbons. Groundwater will be extracted from 2 to 4 recovery wells and pumped through a carbon treatment system to remove the dissolved hydrocarbon components. The system will handle an estimated 5 to 20 gallons per minute, or 7,200 to 28,800 gallons per day, and will be in operation from 1 to 2 years. 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. City of Tukwila, King County, Washington SW 1/4, NW 1/4, Section 14, T23N R4E Street Address: 13435 Interurban South Tukwila, Washington TO BE COMPLETED BY APPLICANT: B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site (circle one): Flat, rolling, hilly, steep slopes, mountainous, other: Flat The site has been previously graded and is entirely paved. b. What is the steepest slope on the site (approximate percent of slope). Does not apply. 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. Soil samples recovered from soil borings and monitoring well bores have been generally classified as silty sands and sandy silts. Excavations on the site have encountered sandy, gravelly fill with metal and wood debris in some areas. United Soil Classification System symbols applied to specific samples in the field included SM (silty sand), and ML (inorganic silts and very fine sands), with some CL (low plasticity clay) and organics (OL). d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Not to the knowledge of ESE. e. Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Approximately 800 to 1500 cubic yards of fill will be used to replace soil that is excavated due to residual petroleum hydrocarbons. The fill source will be local sand and gravel operations. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. No. The entire site is paved. Spalling or erosion from walls of open excavations will be contained within the excavation. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Except for planter areas, the entire site is currently covered with impervious surfaces. After completion of the tank removal, the area of the tank cluster and the dispenser islands will be covered with crushed rock. Later renovation will likely entail repaving of the entire site. Immediately after completion of this project, approximately 65% of the site will remain covered with asphalt, concrete, or the service station building. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any. 2. Air Spalling or erosion from the walls of open excavations will be contained within the excavation. Pavement will be removed only in areas over the excavation sites. Soil will be loaded and transported off site immediately after excavation. Soil stockpiles will be minimal or nonexistent. a. What type 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. Some dust may be generated during drilling and installation of water and vapor extraction (if required) wells. Quantities would depend on soil moisture content and weather conditions, but are expected to be minimal. Excavation and filling activities may generate small quantities of dust, although this will be minimized as a result of project scheduling during the rainy season. Exhaust emissions will be released from excavating equipment. Some volatile vapors will be released during excavation as soil containing residual petroleum is exposed to the atmosphere. During system operation. Some combustion byproducts will be emitted from the internal combustion unit on the soil remediation system, if such a system is required. A Notice of Construction permit will be obtained from the Puget Sound Air Pollution Control Agency for this EVALUATION FOR AGENCY USE ONLY Does not apply. 3. Water a. Surface: TO BE COMPLETED BY APPLICANT: emission. The remaining portions of the soil remediation system (if required) and the groundwater remediation system are entirely enclosed, and will generate no emissions. During groundwater sampling activities and changing of spent carbon filters, very small quantities of volatile petroleum hydrocarbon compounds may be released into the air. In addition, volatile vapors may escape the oil /water separator unit during maintenance activities. These occurrences are expected to be minimal. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. c. Proposed measures to reduce or control emissions or other impacts to air, if any: The soil and groundwater remediation systems will be totally enclosed. Groundwater sampling will be conducted so as to minimize the amount of time the water is exposed to the air. Maintenance on the oil /water separator and the carbon filters will also be conducted so as to minimize the length of time the petroleum compounds are exposed to the air. 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 Duwamish River is located on the opposite side of Interurban South, approximately 300 feet northeast of the subject site. The Duwamish River flows into Elliott Bay, approximately 8 miles to the northwest of the site. There are no wetlands or floodplains on the site, according to Ms. Moira Bradshaw, who is a Planner with the City of Tukwila. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: EVALUATION FOR AGENCY USE ONLY 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. 3 4 5 6 No. Estimate the amount of fill and dredge material that would be placed in or removed from surface water of wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. Does not apply. Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No. Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. According to Ms. Moira Bradshaw, who is a Planner with the City of Tukwila, the site does not lie within a 100 -year floodplain. 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. All effluent will be discharged to the Metro sanitary sewer. Effluent generated from pumping rainwater from open excavations will also be discharged to the Metro system. Permits authorizing these discharges will be obtained from the METRO Industrial Waste Division. b. Ground: 1) Will ground water be withdrawn, or will water be discharged to ground water? Give general description, purpose, and approximated quantities if known. Groundwater containing petroleum hydrocarbons will be extracted from two (2) to four (4) recovery wells and pumped through an oil /water separator and a carbon treatment system. Between 5 and 20 gallons per minute (gpm), or 7,200 to 28,800 gallons per day, of groundwater will be pumped and treated. Treated groundwater will be discharged into the Metro sanitary sewer system. 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. 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. This proposed project will not increase the current amount of runoff at the site. The treated groundwater will be discharged into the Metro sanitary sewer system. Could waste materials enter ground or surface waters? If so, generally describe. The minimal amounts of soil material generated during drilling activities will be immediately contained in 55- gallon drums. Soil excavated during tank removal and soil remediation activities will be loaded directly into truck and trailer combinations and transported off site. d. Proposed measures to reduce or control surface, ground, or runoff water impacts, if any: EVALUATION FOR AGENCY USE ONLY • TO BE COMPLETED BY APPLICANT: EVALUATION FOR AGENCY USE ONLY 4. Plants : a. Check or circle types of vegetation found on the site: Does not apply. Planter areas have ornamental plants only. 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 other types of vegetation b. What kind and amount of vegetation will be removed or altered? Does not apply. c. List threatened or endangered species known to be on or near the site. ESE personnel have not observed any threatened or endangered species in the area. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Does not apply. 5. Animals a. Circle any birds and animals that have been observed on or near the site or are known to be on or near the site: Does not apply. birds: hawk, heron, eagle, songbirds, other: mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other: • TO BE COMPLETED BY APPLICANT: No. 7. Environmental Health b. List any threatened or endangered species known to be on or near the site. Does not apply. The site is located in an urbanized setting. No endangered species have been observed by ESE personnel in this area. c. Is the site part of a migration route? If so, explain. Not to the knowledge of ESE. d. Proposed measures to preserve or enhance wildlife, if any: Does not apply. 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. —The groundwater and soil remediation systems will be powered with electricity. In addition, the soil remediation system (if required) may utilize propane in tanks as a make -up fuel. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. 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: The soil vapor treatment unit, if utilized, will initially operate with propane as a make -up fuel. The unit will run solely off of the vapors if concentrations are high enough. 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. This project is designed to eliminate the environmental health hazard posed by petroleum hydrocarbons in soil and groundwater. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: 1 2 During the remediation program, increased exposure of ESE and subcontract personnel to the volatile organic compounds of petroleum hydrocarbons in the soil and groundwater may occur during groundwater sampling activities, changing of carbon filters in the remediation system and well installation. Any petroleum product removed from the oil /water separator unit on the groundwater remediation system would be flammable and explosive. It would be placed in drums, and periodically disposed of at an approved off site facility. The internal combustion unit on the soil remediation system (if utilized) which burns off the volatile vapors may increase fire and explosion risks. However, the unit is equipped with a built -in dual nozzle automatic fire control system. In addition, the on board computer system automatically shuts down the engine should equipment failure occur. Finally, the unit will be hooked up to a modem line to the ESE office to immediately alert personnel if any portion of the system shuts down or malfunctions. Describe special emergency services that might be required. Fire Department services would be required in case of fire or explosion. Emergency medical services would be required in case of injury resulting from fire or explosion, or from exposure to volatile organic compounds. Proposed measures to reduce or control environmental health hazards, if any: A site specific Health & Safety Plan has been developed by ESE. It covers emergency procedures, personnel protection and safety, and public protection. This plan reflects all relevant State, Federal and ESE health and safety standards and guidelines. All ESE personnel working at the site will have 40 hour OSHA approved training for hazardous materials handling, First Aid and CPR training, and site supervisory training. Levels of volatile organic vapors in the air will be monitored, and personnel will use respirators if levels exceed those specified by State, Federal or ESE guidelines. In addition, the time required to change carbon filters, conduct groundwater sampling and drill wells will be minimized. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: EVALUATION FOR AGENCY USE ONLY Any free petroleum product retrieved from the oil /water separator would be placed in drums and disposed of off site at an approved facility. Appropriate Fire Department c6des and regulations would be followed. 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment operation, other)? Traffic on Interurban South and Interstate 5 generates noise. 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 site. During tank removal and construction of the remediation systems, noise will be generated by excavation equipment, well drilling equipment, and installation of the remediation equipment. All construction noise will occur from 8 AM to 8 PM. During operations, the groundwater remediation equipment will not generate significant amounts of noise. The soil remediation system does generate some noise, but may not be required. If used, the unit is powered by an internal combustion engine, which will reduce the level of noise to the greatest extent possible. 3) Proposed measures to reduce or control noise impacts, if any: Site personnel will be provided with ear protection. Construction will occur from 8 AM to 8 PM. Excavation, Well drilling and equipment installation will be completed as rapidly as safety allows. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? The site is a currently inactive Texaco retail gasoline station. The site is bounded on three sides by a Metro Park and Ride, and on the fourth side by Interurban South. • TO BE COMPLETED BY APPLICANT: b. Has the site been used for agriculture? If so, describe. Not to the knowledge of ESE personnel. c. Describe any structures on the site. The structures on the site include three petroleum dispenser islands, a canopy over two of the islands, and a building housing a service station, office and mini market. d. Will any structures be demolished? If so, what? The dispenser islands and canopy will be demolished during the tank removal and soil remediation program. The service station building may be demolished at a later time. e. What is the current zoning classification of the site? C2 (Regional Commercial). f. What is current comprehensive plan designation of the site? Commercial. g. If applicable, what is the current shoreline master program designation of the site? Does not apply. h. Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. According to Ms. Moira Bradshaw, Planner with the City of Tukwila, there are no environmentally sensitive areas on the site. i. Approximately how many people would reside or work in the completed project? The station is currently inactive and unoccupied. Future use of the site after completion of this proposal has not been determined. During system installation, two (2) to three (3) people will be intermittently on site. After system start up, one (1) to (2) people would periodically visit the site. EVALUATION FOR AGENCY USE ONLY p:o qS . .°iC. . ..3. r Ey n ). '•.. r T ^:iil. �Sp .d .q. ;'i: rti�4 ;. >.. �.... �; t' ?v �. a�d� her,,`, e:v "'; .,....: afr�� °, . G (' �;4`; Y. ..... ,., ri Z� 1 �.. Y: ?': Y':a' 'w TO BE COMPLETED BY APPLICANT: EVALUATION FOR AGENCY USE ONLY 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. 1. Proposed measures to ensure the proposal is compatible with existing and project land uses and plans, if any: Does not apply. 9. Housing a. Approximately how many units would be provided, if any? Indicated 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: Maximum height of the remediation systems is approximately six (6) feet. b. What views in the immediate vicinity would be altered or obstructed? None. TO BE COMPLETED BY APPLICANT: No. Does not apply. c. Proposed measures to reduce or control aesthetic impacts, if any: The remediation systems will be enclosed in a chain link enclosure with slats to limit visibility. 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? Temporary lighting may be needed while remediation systems are being installed. After installation, no additional light or glare will be produced. 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. d. Proposed measures to reduce or control light and glare impacts, if any: Does not apply. 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? Foster Golf Links is near the site. b. Would the proposed project displace any existing recreational uses? If so, describe. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: 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. Not to the knowledge of ESE personnel b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. Does not apply. 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 the proposed access to the existing street system. Show on site plans, if any. The site is served by Interurban South. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? The nearest Metro stop is approximately 1000 feet south on Interurban South. How many parking spaces would the completed project have? How many would the project eliminate? The proposed project would not permanently alter the number of existing parking places at the site. d. Will the proposal require any new roads or streets, or improvements of existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). No. No. e. Will the project use (or occur in the immediate vicinity or) water, rail, or air transportation? If so, generally describe. EVALUATION FOR AGENCY USE ONLY g. Does not apply. 15. Public Services 16. Utilities TO BE COMPLETED BY APPLICANT: EVALUATION FOR AGENCY USE ONLY f. How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. Once in operation, the soil and groundwater remediation proposal would generate approximately two (2) vehicular trips per week by ESE personnel. This would last for the project duration of 1 to 2 years. Peak volumes of vehicular trips will occur during drilling and while remedial systems are being installed. Proposed measures to reduce or control transportation impacts, if any. 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. On a normal basis, no additional public services would be required by the proposed project. In case of emergency, increased fire and police protection and emergency medical services would be required. b. Proposed measures to reduce or control direct impacts on public services, if any. All applicable health and safety standards and building and fire codes will be adhered to. All on site ESE personnel will have First Aid, CPR, OSHA and supervisory training. a. Circle utilities currently available at the site: c�1ectricit �, ciatural gas, Cwateil crefuse servic�je, e ep on sani ary +, septic system, other. 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. Electrical connection from Puget Power Sanitary sewer connection from Metro and /or City of Tukwila " EVALUATION FOR AGENCY USE ONLY This checklist was reviewed by Environmental Specialist, Department of Construction and Land Use. Any comments or changes made by the Department are entered in the body of the checklist and contain the initials of the reviewer. TO BE COMPLETED BY APPLICANT: D. SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (Do not use this sheet for project actions) Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage, or release of toxic or hazardous substances; or production of noise? The proposal will discharge 7,200 to 28,800 gallons per day of treated groundwater into the Metro sanitary sewer system. The soil remediation system (if needed) will generate some combustion byproduct emissions to the air. It will remove a hazardous substance, petroleum hydrocarbons, from soil and groundwater. The majority of these substances will be captured in an oil /water separator or a carbon filter. Any separated petroleum product and spent carbon would be disposed of at an approved off site facility. Proposed measures to avoid or reduce such increases are: Best Available Technology, consisting of activated carbon, will be used in the remediation system. During soil excavation activities, water will be used to minimize dust emissions, if necessary. Work will be conducted during daylight hours to minimize the impact of additional noise generated. 2. How would the proposal be likely to affect plants, animals, fish, or marine life? The proposed project may eventually avoid a negative impact to plants, animals, fish or marine life by removing petroleum hydrocarbons from the soil and groundwater at the site. If not removed, these materials may eventually affect these populations. Proposed measures to protect or conserve plants, animals, fish, or marine life are: Does not apply. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: 3. How would the proposal be likely to deplete energy or natural resources? Energy, in the form of electricity and natural gas, would be required for the 1 to 2 year duration of the proposed project. Proposed measures to protect or conserve energy and natural resources are: Does not apply. 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime farmlands? The proposal would have no affect on the above referenced areas. Proposed measures to protect such resources or to avoid or reduce impacts are: Does not apply. 5. How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses incompatible with existing plans? The proposal may allow future land uses that are currently not feasible due to petroleum contamination at the site. Proposed measures to avoid or reduce shoreline and land use impacts are: Does not apply. 6. How would the proposal be likely to increase demands on transportation or public services and utilities? The soil and groundwater remediation systems would require some additional electrical utilities during operation. In addition, increased demands for Metro sanitary sewer services would result. Impact to transportation services would be minimal. EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED BY APPLICANT: Proposed measures to reduce or respond to such demand(s) are: Does not apply. 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment. The completion of this proposed project is required for compliance with state, local and federal laws for the protection of the environment. EVALUATION FOR AGENCY USE ONLY Lq2--WIS SECOR International Incorporated DWN AJW APPR DATE 1/5/95 JOB# 00111-051-01 P. SDI 40. PVC MC a•• MW-2 NM del & COON I' 2 IM C "C, HAVIICID PfLIRA1101 ILAD1 HID POCR PCLE LRAM CUD LAILINL1 / r 16 s:34 4111.CIOUDi CADDY SUM MW-3 LA2.-W" S' lam — To. SCH 40, PVC GROUNDWATER DISCHARGE PIPING 1 0, SCH 40, PVC V1POR EXTRACTION PIPING 30, SCH 40, PVC MAIN ELECTRICAL CONDUIT to, SCH 40, PVC (HORIZONTAL) 2 GALVANIZED STEEL (SWEEPS AND RISERS) VAPOR EXTRACTION TRENCH 30, SCH 40, PVC PIPE 3 SCH 40, PVC SCREEN (0.01(" SLOTS) INFILTROON LEACH AEU) te, SCH 40, PVC PIPE 20, SCH 40, PVC SCREEN (0.020 SLOTS) 0 25 50 SCALE (FEET) SECOR international Incorporated DWN AJW APPR DATE 1/5/95 JOB, 00111-051-01 FIGURE 1 REMEDIATION SYSTEM LAYOUT FORMER TEXACO STATION 063-232-0281 13435 INTERURBAN AVENUE S. TUKWILA, WASHINGTON DWG: TEX51229