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GROUND ZERO ANALYSIS,INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 C�0�/'�IS� <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 FEB — 5 2008 <br /> ENVIRONMENT HEALTH <br /> February 4, 2008 PERMIT/SERVICES .'` <br /> Mr. Michael Infurna �`` <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Subject: Letter Addendum—Workplan for the Installation of ISCO Injection Point <br /> Valley Pacific Petroleum Services, Inc. (Woolsey Oil, Inc.) Cardlock Facility <br /> 1501 W. Charter Way, Stockton, CA(Site Code 508175) <br /> Dear Mr. Infurna: <br /> This letter addendum to the September 14, 2007 workplan for the Installation of ISCO Injection <br /> Point has been written in response to phone conversations and email correspondence with Mr. <br /> Infurna of the San Joaquin County Environmental Health department (EHD). The location of the <br /> Site is shown in Figure 1. <br /> The September 2007 workplan proposed the installation of an oxidant injection point near the location <br /> of monitoring well MW3 (Figure 2). During a phone conversation with Mr. Infurna it was <br /> recommended that a bench scale test (BST) of the proposed oxidant be completed with favorable <br /> results prior to the installation of an injection point. Ground Zero Analysis, Inc. (GZA) agreed with <br /> EHD's recommendation. The Regional Water Quality Control Board (RWQCB) indicated that <br /> contaminated soil collected from the treatment area be used in the BST. In order to collect a <br /> representative soil sample from the treatment area GZA proposes advancing one soil boring in the <br /> location. shown on Figure 2. Figure 3 shows the boring in relationship to existing USTs and <br /> associated piping. <br /> Drilling will be conducted by a C-57 licensed drilling contractor using 8" diameter hollow stem <br /> augers under the supervision of an experienced geologist working for GZA. The boring will be <br /> free-drilled to approximately 20 feet below grade surface (bgs) and then continuously sampled to <br /> a total depth of 35 feet bgs. Laboratory analysis of soil samples collected during the installation <br /> of MW3 indicated the highest levels of contamination were between 25 and 30 feet bgs. Soil <br /> analytical data is summarized in Table 1 of the September 2007 Workplan. <br /> The soil will be continuously cored in 18-inch intervals from 20 to 35 feet bgs, filling 6-inch brass <br /> tubes in a modified split-spoon sampler. The geologist will inspect the upper most tube in each <br /> interval and submit the center brass tube from each interval having the highest PID readings for <br /> G:\GROUNDZE\WOOLSEY.CHT\Reports\Workplan\WP Addendum 080Ldoc <br />