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Site History 14000 Highway 88,Lockeford CA ' Time Oil Property Na 1}4-049 acted soils t A ses n - was performed to assist+n determining the extent of imp of the r robes to depths of up to 13 feet In the vicinity On August 26, 1992, a soil vapor survey r samples from each probe at A pneumatic hammer w used and dCharcoaf urive 13 +beswe a used to collect vaporbile lab where It MO former tanks Vacuum pumps le was submitted to an onsiteust below ground Due to the presence of hardpan7 deeper than 13 various depths immediately after colSection, each sample was extracted and injected tte Set°va gas apor survey chromatograph e rnited, as no probes could be advanced deep surface, the results feet approximately 28, a drill ng was used to advance 4 �to consist of hardpan to app extractione During the week of Septembersilts we sands and sandy weiis and 3 vapor inlet wells During field activities, soils were found of the borings Groundwater was not feet this strata was underlain by loose fine to medium sands Dense silty 15 , generally encountered at depth of 34 to 35 feet to the extent encountered during field field instrumentation hydrocarbons were no longer indicated t W1 was _2 and SB-4 were terminated at a depth of 40 feet while d to f ) Drilling at each location was continued until by l bcanngs 5B-1, SB were installed to 40 feet, while W4 was installed t° 30 feet and Accordingly, and Ws or extraction wells, and advanced to 45 feet Wells W3,W5, W3 were installed as 4" diameter ea h we was constructed W2 was installed to 45 #eet Wells W1, diameter vapor inlet wells Althou9 wells W4, W5, and W6 were installed as 2' ending on well depth and field observations using 0 020 slotted casing, screened intervals varied depending screening and visual es from each baring were submitted far analysis based an lyzed for TPH, STEX, and Three soil samples were submitted from W3) Each sample observation (Only 2 samplesgenerally limited to the area of the former ethylene dibromide hest concentrations of contaminants were Results indicated that soil contamination was 9 les collected from a depth of 15 eared to exist at a depth of 30 feet to 35 feet The hig Samples tanks and app W2, and SB-2 m gasoline however, samples collected at 30 feet contained less indicated in 30-foot sample ined 20fle 3QQ pp gSB-2) and W8 contained trace to "non-detect' feet in SB-1 and VU3 Samples collected from Sg-4, W4, W5, depths of 40 feet to 45 feet contained than 10 ppm gasoline of contaminants None of the les collected from concentrat+onncentratio s of gasoline or its constituents detectable co pe on W1, W2, and W l to evaluate Pilot test wasp indicate that sal vapors can vapor extraction The resuits of the studay s to be apRrapriate far site ion p After the instalfatron of the wetly, a vapor extra or extraction appears the feasibility of in-situ remediation by p be easily extracted from the existing wells and that vap the former tank remediation appeared that impacted soils were severald to of the soil samples Based on the results of the site +nvestrgat+on, +t aRRe depth of 34 feet Although W4 W5, and W6 generally trace concentrations of hydrocarbons, SB th of the tanks excavation and the se r dense soils ils encountered atasouthwest, north, and sou submitted for analyses sout defined the extent of soil contamination to the west, regulatory agencies on May 1S 1993, the pHSfEHD requested that a workplan far an additional co of Canorne`s"Site Assessment Report'was forwarded to the appropriate A pY 1 dated June , investigation 1993 In their reply investigation to verify the extent of sod contamination be submitted taAc v ie - Woryplan, Additional Environmental r 1 gECOR} ` W rk I f r A d + n l i Engineering Analysis Corporation's A copy of Science and Eng appropriate regulatory agencies on October 20, 1993 The goal aft e Investigation" was forwarded to thepp 2