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Upgradiertr Environmental Consultants <br /> April 21, 1998 <br /> Mr. Michael Infurna, Senior RENS '' '' ` �` i �' 0 <br /> Public Health Services <br /> Environmental Health Division <br /> San Joaquin County <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Work Plan Addendum J <br /> Kwikee Food Mart <br /> 2081 Country Club Boulevard <br /> Stockton,CA <br /> Dear Mr. Infurna: <br /> On behalf of Mr. William Peters, Upgradient Environmental Consultants would like to further amend the <br /> October 1997 work plan for investigation of contamination at 2081 Country Club Boulevard. This <br /> request stems from the results of the recent tank removal at the site, which documented that the USTs <br /> have been a continuing source of gasoline contamination of the underlying soil and groundwater. In view <br /> of this new information, a more thorough investigation of the extent of soil contamination in the vicinity <br /> of the USTs is warranted. Because the data gained from such an investigation will likely have an impact <br /> on the location, number, and type of wells that will need to be installed to adequately assess and <br /> remediate the groundwater contamination, it is our opinion that the soil assessment should take priority at <br /> this time. Hence, we request that the drilling of additional monitoring wells be delayed until after we <br /> have performed a soil assessment. If this meets with your approval, we anticipate conducting the soil <br /> assessment and collecting a round of groundwater samples from the existing wells in mid-May and <br /> completing the report in early June. Drilling and installation of wells could then take place during the <br /> third quarter of 1998. <br /> i <br /> The attached Site Map shows the location of five proposed Geoprobe borings. The first boring will be <br /> drilled in the southeast corner of the former UST cavity, where contaminant concentrations reached a <br /> maximum in the recent tank removal samples. The purpose of this boring is to determine the maximum <br /> depth of contamination. At present, we estimate drilling to approxmitely 35 feet. The depth of subsequent <br /> borings will be determined on a case-by-case basis, but each will be drilled to a minimum of 20 feet. Soil <br /> samples will be collected at 5-foot intervals, and we anticipate submitting a minimum of 2 samples per <br /> boring for laboratory analysis. The samples will be analyzed for TPH-gasoline, BTEX,and five <br /> oxygenates, and 3 samples will also be submitted for permeability, Total Organic Carbon, and bacterial <br /> abundance. After sampling,the borings will be backfilled with cement grout to the surface. <br /> In conjunction with this phase of drilling, we will also perform the I st quarter groundwater monitoring. <br /> Water samples will be analyzed as in previous monitoring events. <br /> Sincerely, <br /> Victor B. Cherven, Ph. D. <br /> President <br /> Wiliam Peters <br /> Stockton: P.O. Box 8002, Stockton, CA 95208 (209) 772-3620 <br /> V Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (916) 677-3055 <br />