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64/05/2000 14: 43 209-579-222" MODESTO ATC PAGE 05 <br /> AW <br /> -AWIA <br /> Working To Restore Nature <br /> RFSNA has periodically bailed floating free product from well MW-4. Free product is stored <br /> on-site in DOT approved drums pending appropriate disposal. A summary of free product <br /> removal is presented on Table 3. <br /> 3.0 SITE SETIZNG <br /> The project site is situated on level terrain comprised of Quaternary to Recent alluvial sediments. <br /> The site is bounded on the southern property line by the westerly flowing Smith Canal (Figure <br /> 1). Groundwater flow is currently north-northwesterly, away from the canal. The water table <br /> beneath the site is relatively shallow, approximately 12 to 15 feet below grade. Near surface <br /> sediments in the area consist of interbedded sands, silts, clays, and gravels. As is typical of <br /> alluvial environments, higher permeability zones representing former stream channels occur as <br /> sinuous or lenticular features. Locations of wells within one mile of the project site provided <br /> by the Department of Water Resources (DWR) are plotted on Figure 3. The closest well to the <br /> tank location is located approximately 85 feet north of the former diesel tank. This well was <br /> previously used to irrigate city property to the north of the pumping plant, but was destroyed <br /> in accordance with State and PHS/EHD guidelines during the fourth quarter of 1992. <br /> 4.0 PHASE II INVESTIGATION <br /> During a meeting with the City on December 14, 1992, PHS/EHD requested additional work <br /> at the project site to further define the lateral extent of soil and groundwater contamination. <br /> On August 3 through 5, 1993, RFSNA drilled and sampled a total of ten soil borings (SB-3 <br /> through SB-10, MW-5, and MW-6) at the project site to approximately 15-20 feet below grade. <br /> Two of the borings (MW-5 and MW-6) were advanced an additional 15 feet and converted to <br /> groundwater monitoring wells. Discrete groundwater samples were also collected from four of <br /> the soil borings (SB-3, SB-7, SB-8, and SB-9) using the Hydropunch technology. The newly <br /> installed boring/well locations are shown on Figure 2. <br /> IREPORTS/PAR1093.FNr 3 <br /> I <br />