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.. — <br /> I <br /> California Standards for Drinking water of 1 ppb Benzene. The May <br /> 23, 1990, sampling of the wells found the ground water to be below <br /> the detection limits, see Table 2. <br /> CONCLUSIONS <br /> 1. Benzene is below detection limits for all wells (MW1, MW2 <br /> and MW3) . <br /> 2. Over excavation of the tank field and waste oil tank area <br /> removed the contaminated soil. <br /> 3. The limited ground water contamination found beneath the <br /> tank field and at monitor well MW1 was remediated by. <br /> evaporation and/or dilution. <br /> RECOMMENDATIONS <br /> 1. Based upon the above conclusions this site should be <br /> ' considered as "closed" for Desert Petroleum Inc. <br /> 2. Once site closure is granted, the existing onsite monitor <br /> wells should be destroyed, to prevent any risk to the ground <br /> 3i..;. water from ongoing retail of gasoline at the present . service ` <br /> station facility rat site. <br /> a <br /> LIMITATIONS <br /> The discussion and conclusions presented in this report are based <br /> . . on the following: <br /> 1. The observations and data collected by field personnel. <br /> - i <br /> 2. The results of laboratory analyses performed by a state <br /> certified lab. <br /> 3. Our understanding of the regulations. of the State of <br /> California and San Joaquin County Health Department and/or City of <br /> Tracy, California. <br /> --- - ------------Changes-in-.ground-water-conditions--can=occur-due-to-variations—in ---- - ---- - --=--- <br /> rainfall, temperature, local and regional water usage and local <br /> construction.practices. In addition, variations in the soil and <br /> ground water conditions could;Qsist beyond the points explored in <br /> i this investigation. <br /> ;! page5 <br />