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J. H. KLEINFELDER & ASSOCIATES <br />File No. S-1716-2 <br />July 2, 1985 <br />Page 4 <br />at the well locations. Although this monitoring method was an appropriate procedure <br />for the depth to groundwater at the site, it is possible that minor leaks could be <br />present beyond the well locations. We propose to supplement the previous work by: <br />• Using an OVA to determine if measurable levels of volatile <br />hydrocarbon vapors have accumulated. <br />• Conducting precision tank testing of the tanks. This work <br />will be performed by Woolsey Oil. <br />• Incorporating groundwater monitoring results into the <br />underground tank assessment work. This work is <br />described in a following section of this proposal. <br />SURFACE SPILLAGE AREA <br />Although there were several areas where ground spillage was noted, only one <br />area had any significant surface stains. We will include a limited investigation of this <br />area to respond to the county's concerns. <br />The area in question lies along the southern fence line. One shallow soil boring <br />will be placed in this area. Samples will be collected at 3 and 5 feet, screened with <br />an OVA and if necessary, one sample will be analyzed for the specified constituents. <br />Further work will be recommended only if results of this work indicate that additional <br />investigations into this area are necessary and cost-effective. These boreholes will <br />also be backfilled with concrete. <br />GROUNDWATER INVESTIGATION <br />Investigation of groundwater underlying the facility will be conducted in two, <br />possibly three, phases. The first phase will investigate groundwater underlying the <br />tank farm and transfer block and gather necessary hydrologic information to place <br />