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i <br /> CAMB RIA <br /> September 27, 2006 <br /> II Ms. Victoria L. McCartney HEMMED <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3rd Floor SEP 2 9 2006 <br /> Stockton, California 95202 <br /> ENVIRONMENT HEALTH <br /> Re: Work Plan for Additional Site Assessment Addendum PERMIT/SERVICES <br /> JIMCO Truck Plaza <br /> 1022 Frontage Road (Formerly 22502 S. Highway 99) <br /> Ripon, California <br /> Site Code 1604 <br /> Cambria Project# 165-1556 <br /> Dear Ms. McCartney: <br /> On behalf of Olympian JV (Olympian), Cambria Environmental Technology, Inc. (Cambria) has <br /> prepared this Work Plan forAdditional Site Assessment Addendum for the referenced site in response <br /> to the San Joaquin County Environmental Health Department's (SJCEHD) letter dated August 28, <br /> 2006 (Attachment A). The SJCEHD letter requested additional clarification for the scope of work <br /> proposed in the July 25, 2006 Work Plan for Additional Site Assessment prepared by Cambria. <br /> Presented below is our response to the SJCEHD letter. <br /> Cambria plans to perform additional site assessment activities in two stages. The first stage will <br /> involve the drilling of three cone penetration testing (CPT) borings, equipped with a membrane <br /> interface probe(MIP),at the previously proposed locations(Figure 1). During drilling,tip resistance, <br /> sleeve friction,dynamic pore pressure,and hydrocarbon measurements will be electronically recorded <br /> on a continuous log from which the subsurface lithology, stratigraphy, and contaminant distribution <br /> will be inferred. The first CPT boring will be drilled adjacent to well MW-1 and will be advanced to <br /> 100 feet below grade surface (ft bgs). The other two proposed CPT borings will be advanced to a <br /> depth of approximately 80 ft bgs, but may be advanced deeper based on data from the first CPT <br /> boring. Using the output from the electronic log, a second boring will be advanced adjacent to each <br /> CPT boring to collect depth-discrete groundwater samples for laboratory analysis. Groundwater <br /> sampling will be attempted where water-bearing zones are encountered, using a Hydropunch° <br /> sampling system. It is anticipated that two to three depth-discrete groundwater samples will be <br /> collected from each boring and submitted town analytical laboratory. <br /> Cambria Upon receipt of analytical data from the CPT borings,Cambria will perform the second stage of site <br /> Environmental <br /> Technology,Inc. assessment consisting of the drilling of 10 Geoprobe°borings at the previously proposed locations <br /> (Figure 1). Using MIP and laboratory analytical data obtained from the previous three CPT borings, <br /> 5900 Hollis Street <br /> Suite A the Geoprobe°borings will be advanced to 25 ft bgs,or deeper if necessary,such that sufficient data is <br /> Emeryville,CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br /> i <br /> i <br />