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_ x - <br /> LEM, . <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 MWi was remediated by <br /> evaporation and/or dilution. <br /> j <br /> RECOMMENDATIONS <br /> 1. Based this s <br /> erednast"closed° fore abovcDesertSPetroleumeInc�uld be <br /> consid <br /> 2. Once site closure is granted, the existing onsite monitor <br /> wells to prevent <br /> ells should be destroyeany risk to the ground <br /> of gasoline at the present service <br /> water from ongoing retail <br /> station facility on site. <br /> LIMITATIONS <br /> usions presented in this report are based <br /> The discussion and concl <br /> on the following <br /> 1. The observations and data collected by field personnel. <br /> 2. The resultsof laboratory analyses performed by a state <br /> certified lab. <br /> 3, <br /> our . understanding of the regulations of the State of <br /> California and San Joaquin County Health Department and/ <br /> City of <br /> Tracy, Cal-ifornia. <br /> Changes in ground water conditions can occur due to variations in <br /> rainfall, temperature, local and regional water usage and local <br /> In addition, variations --n-the soil and <br /> construction practices. <br /> groundwater conditions could exist beyond the points explored in <br /> ----- ------------this--investigation.---------- ----------------- --------------=---------- -------.. <br /> pages <br />