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March 9 , 1990 <br /> Environmental Health Permit/ Services <br /> San Joaquin Local Health District <br /> 1601 E. Hazelton Ave. <br /> Stockton CA. 95201 <br /> Attn: Elinor Ratliff <br /> Subject: Pre-Tank Replacement Site Assessment Work Plan <br /> Monitoring Well Installation Phase <br /> Shell Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> Ms: Ratliff: <br /> This correspondence describes the proposed installation of ground <br /> water monitoring wells at the above referenced site. The <br /> monitoring wells are part of a continuing problem assessment at <br /> the site. The assessment is in response to a leaking under ground <br /> fuel storage tank at the site. <br /> Background information on the site is discussed in Aegis <br /> Environmental Consultants' Pre-tank Replacement Site Assessment <br /> (March 6, 1990) . Soil borings completed during the Pre-tank <br /> Replacement Assessment indicate the presence of ground water at <br /> 55 feet below grade beneath the site. Analytical results of soil <br /> samples recovered from the borings indicate the presence of 780 <br /> parts per million TPH as Gasoline at a depth of 45 feet below <br /> grade. Copies of the analytical lab reports are included as <br /> enclosure A. <br /> As part of the continuing assessment Aegis Environmental <br /> Consultants proposes to install three on site ground water <br /> monitoring wells. Soil sampling will be conducted according to <br /> the same guidelines as described in the original workplan. The <br /> wells will be installed sampled and developed according to San <br /> Joaquin County and Regional Water Quality Control board <br /> guidelines. Water samples will be analyzed for total petroleum <br /> hydrocarbons as gasoline (TPH) and benzene, toluene xylenes and <br /> toluene. The locations of the proposed monitoring wells and <br /> completed borings are shown on Figure 1 included as Enclosure B. <br /> Construction details of the ground water monitoring wells are <br />