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_" lJ E 1 4 5 P .4- <br /> Page <br /> Page. Two <br /> January 16, 1989 <br /> Mr. Gordon Boggs <br /> Upon review of leinfelder's results, the Environmental Health <br /> Division of the San Joaquin' Health District advised that further <br /> assessment should be performed at the site. The following <br /> sections indicated Kleinfelder's proposed further assessment. <br /> Excavation <br /> Kleinfelder proposes to have the soil backfilled in the tank <br /> excavation re-excavated- and removed from the site. Additional <br /> assessment of contaminated soil in the tank excavation area will <br /> be performed using a backhoe. Any contaminated soil encountered <br /> during the assessment will also be removed from the site. The <br /> engineering excavator will continue to excavate soil until <br /> contaminated soil is no longer encountered or the stability of <br /> pre-existing structures are threatened with continued <br /> excavation. <br /> Ground Water Monit rind <br /> To assess the possible contamination of ground water, three <br /> ground water monitoring wells will be installed surrounding the <br /> area of contamination (Plate 1) . . From these three wells, the <br /> ground water gradient will be established. After the wells are <br /> developed, they will be sampled and analyzed for TPH and BTX. <br /> If after two rounds of successive sampling, acceptably low or <br /> nondetectable levels of TPH and BTEC are present in the ground <br /> water, the wells will be proposed to be properly abandoned. <br /> Sampling Analyses <br /> Confirmation soil samplas collected during the assessment will <br /> be submitted to a California certified laboratory for analyses. <br /> These samples will be analyzed using either an onsite mobile lab <br /> or will be submitted on a 24-hour turnaround. The TPH analysis <br /> will be performed by GC/FID. For the BTX analyses, an <br /> acceptable extraction preparatory method will be used to prepare <br /> the samples, the Samples will then be analyzed using FPA Method <br /> 8020. <br /> Water samples collected from the monitoring wells will also be <br /> analyzed for TPH and BTX using GG/FID and „EPA Method 602, <br /> respectively. <br /> i <br /> _ _ 4 <br />