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MAY-11-95 THU 16:08 CONDOR EARTH TECH AX NO. 2096689248 P. 03 <br /> pw*tate <br /> concentration of hydrocarbons using-the WBT procedure are pencr&lly less thm the concentrations detected in <br /> a soil sample that has been analyzed using a non-wlwET njeto& Tbereforc� assuming a worst case in which, <br /> 100% of the hydrocarbart constituents detected .in the soil sample collected from the floor of the over- j <br /> i <br /> excavation are leachable (6-2 gglkg toluene and 10 µgAg xyl e), the quantity of Seachable bydrocazbon <br /> constituents would be less than the CRWQCB,CVR mommended water quality goals for toluene and xylene- <br /> ' i <br /> PROPOSED WORK <br /> As you indicated on the telephone,the detection of 6.Z ggft toluene and 10 jig/kg xylene in the sail <br /> sample collected from the floor of the over-excavation does Eot conte Swundwater contamination at the site. <br /> your conclusions are supported by the WQSA doc+mment- T erefore, you requested that Di Salvo Trucldng <br /> proceed with the phased investigation discussed in Condor's eptextber 27, 1994, groundwater investigation <br /> work plan and collect one (1) groundwater sample from near the east egad of M4 using a NYdropunch <br /> satnphug tool. The purpose of collecting the groundwater sanple is to evaluate if hydrocarbon c0atmnination <br /> detected in the soil subsurface has leached into the shallow vw.atcr table at.the site. <br /> Considering the above discussion regardjug soil learlability, Di salvo Truc&jtag requests site closure <br /> for the Lathrop sits if the groundwater sample collected fron3 the Hydropunch sampling tocol contains <br /> hydrocarbon constituents at or below the CRWQCB,CVR recommended woer quality goals. Di Salvo <br /> Trucicivag has instructed Condor to await written correspondence from the San Joaquin County Public Health <br /> Services, Environmental Health,Division Wacurring with thi site closure request prior to scheduling field <br /> work. Hydropwach sampling will be scheduled as soon as possible upon receipt of your lettoyr of concurrence. <br /> If you have any questions or need additional information, yo umay contact me at (209) 66$-9234. <br /> Rcspectfully, R <br /> eviewedy, <br /> ;, <br /> !t. Cram r gineer <br /> cc: Charlie Lawlor, Di Salvo Trucking <br /> Elizabeth Thayor, CRWQCB <br /> Barbara Anderson, SWQC13 <br /> ,ant.vau.nrrrRor&rcPrrsW rR <br /> �. coNnoa <br />