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PROPOSED WORK PLAN FOR PRE-TANK PULL SOIL ASSESSMENT <br /> Shell Service Station,Stockton, CA <br /> i <br /> Delta Project No.40-88-147 • 1 <br /> mm Page 7 <br /> Site will be constructed, and the results of the soil sample screening will be plotted on' the cross <br /> sections. Based on this information, soil samples will be selected for chemical analyses to Best define <br /> the vertical extent of contamination. <br /> 3.3 Chemical Ana §' <br /> Soil samples will be selected from each soil boring and sent to Eureka Laboratories -in'Sacramento for <br /> -- chemical analysis. The parameters that Eureka Laboratories will analyze for and the corresponding EPA <br /> a i; <br /> Method they will use for soil samples are presented in Table 1. <br /> J , <br /> TABLE 2 <br /> Analytical Methods <br /> EPA Method ' <br /> Paramgter for Soil <br /> BTX 8020 <br /> Total Petroleum Hydrocarbons 8015 Modified 1 <br /> NOTES: BTX = Benzene, Toluene, Xylenes <br /> r 4.0 METHODS <br /> 4.1 Soil San py ina and Contamination Reduction <br /> KL. a: 1 <br /> The drilling and soil sampling wiil be performed under the direction of a Delta engiiider.or geologist. <br /> I <br /> The soil borings will be advanced using a truck-mounted drill rig v,iith the capability of Hollow-stem <br /> augering. <br /> ci f <br /> To reduce the chances of cross contamination between boreholes,all down-hole drilling equipment will <br /> be steam cleaned between each soil boring. To reduce cross contamination betweetijoiil samples, the <br /> iso,. SIC <br /> California sampler will be washed in a soap solution and double rinsed between each'sampling event. <br /> 4: <br /> Soil sampling will be done in accordance with ASTM,'1586-84. Using this procedure,:a07 inch O.D. <br />