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NFAU <br /> beneath the site is relatively shallow, approximately 15 feet below grade. Near surface materials <br /> in the area consist of interbedded sands, silts, clays, and gravels. As is typical of alluvial <br /> environments, higher permeability zones representing former stream channels occur as sinuous <br /> or lenticular features. Locations of wells within one mile of the project site provided by the <br /> Department of Water Resources (DWR) are plotted on Figure 3. The closest well to the tank <br /> location is located on the property approximately 85 feet north of the former diesel tank. This <br /> well is not currently in use but was previously used to irrigate city property to the north of the <br /> k :# pumping plant. This eight inch diameter irrigation well is approximately 100 feet deep but <br /> specific construction details could not be obtained. <br /> The non-functioning pump from this well was removed and the well sampled on March 18, <br /> 3 <br /> 1992, for diesel hydrocarbon constituents and fecal coliform per requirements of the PHS/EHD. <br /> Only total coliform was detected at 41 ppm. All other analytes were not detected (Table 2). <br /> The well is scheduled to be destroyed during the First Quarter of 1993. <br /> �>> 4.0 PROPOSED WORK-PHASE H <br /> � 4.1 Methods and Procedures <br /> To further assess the lateral and vertical extent of soil and groundwater impaction, RESNA <br /> proposes to drill and sample a total of nine soil borings at the site, two of which will be <br /> -� converted to groundwater monitoring wells. In addition, discrete groundwater samples will be <br /> collected from four of the remaining seven soil borings using the hydropunch technology. The <br /> proposed boring/well locations are plotted on Figure 4. <br /> ,., One soil boring each will be advanced near existing wells MW1, MW2, and MW3 to investigate <br /> F soil contaminants detected in those areas during RESNA's initial investigation. The proposed <br /> groundwater monitoring wells and hydropunch samples will be positioned to further define the <br /> lateral extent of the floating Product near well MW4 and potential groundwater contamination <br /> in the upgradient and downgradient directions from the former tank. j <br /> REMRTSIWP-JM.FNL 3 <br /> 4 <br /> lk- 4 <br />