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Underground Storage Tanis Removal Report and Work Plan for Additional Site Investigation 2 <br /> Southland Store#14117 2725 Country Club Boulevard Stockton California Se ember 29.1998 <br /> 3.0 UNDERGROUND STORAGE TANK REMOVAL <br /> On July 17, 1998, Pacific Engineering coordinated the removal and disposal of the three 10,000-gallon <br /> single wall USTs Mr Michael Kith of the SJCPHS was on site to witness the UST removal The USTs <br /> were removed from the excavation using a crane and loaded onto trailers The tanks were transported <br /> from the site by Trident Truck Lines under hazardous waste manifest to Erickson Incorporated in <br /> Richmond, California for proper disposal (Appendix B) All three USTs were in good condition with no <br /> visual holes or pits Groundwater was encountered in the excavation at a depth of approximately 8 feet <br /> ' to 11 feet below ground surface (BGS) <br /> Prior to tank removal, Erickson, Inc triple rinsed the;iiree USTs at the site Tank rinse was collected <br /> using a vacuum truck and transported under hazardous waste manifest to Erickson, Inc <br /> to be recycled Tank nnse disposal documentation will be forwarded to the SJCPHS upon receipt <br /> Approximately 185 cubic yards of tank overburden,generated during the excavation of the USTs,was <br /> ' stockpiled on site pending charactenzabon and disposal <br /> 3 1 Soil and Groundwater Sample Collection <br /> On July 17, 1998, Fluor Daniel GTl personnel collected six soil samples from the floor of the UST <br /> excavation Soil samples were collected beneath each end of the three USTs at a depth of 13 5 feet to <br /> 14 5 feet BGS (Figure 2) In addition, one groundwater grab sample was collected beneath each of <br /> the USTs All soil and groundwater sampling was conducted at the direction and observation of Mr <br /> Michael Kith of the SJCPHS <br /> Soil samples were collected in 2-inch-diameter by 6-inch-long brass tubes directly from a backhoe <br /> bucket Soil beneath the former USTs consisted of clayey sandy silt The sample tubes were sealed <br /> with teflon pads, plastic caps and tape, labeled, placed on ice in an insulated container, and submitted <br /> for analyses under chain-of-custody manifest to state-certified West Analytical Laboratory (WEST) in <br /> Davis, CA The six soil samples were analyzed for benzene,toluene, ethylbenzene,total xylenes <br /> (BTEX), methyl tert-butyl ether(MTBE), and total petroleum hydrocarbons-as-gasoline (TPH-G) by <br /> ' EPA methods 8020/8015 modified and the oxygenates tert-butanol (TBA), MTBE, diisopropyl ether <br /> (DIPS), ethyl-tert-butyl ether (ETRE),tert-amyl methyl ether(TAME) by EPA method 8260 In addition, <br /> two soil samples (TW-2-14' and TW-1-14 5')were analyzed for total lead by EPA method 6010 <br /> ' The groundwater samples were collected using a disposable bailer,then poured into a 1-Miter amber <br /> bottle and 40-milliliter glass vials, filled to zero headspace and treated with hydrochloric acid to <br /> tpreserved the samples The samples were sealed using teflon-septum caps, labeled, placed on ice in <br /> an insulated container, and transported under chain-of-custody to WEST labs in Davis The three <br /> groundwater samples were analyzed for BTEX, MTBE, and TPH-G by EPA methods 8020/8015 <br /> 14117ust rpt <br /> FLUOR DANIEL GTI <br /> ' L� <br />