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1117 Lone Palm Avenue,Suite 201 B <br /> Modesto, California 95351 <br /> ATC 209-579-2221 <br /> Fax:209-579-2222 <br /> Shaping the Future <br /> January 19,2015 <br /> 54.26823.0001 <br /> Ms.Angelica S.Marin <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Subject: Workplan for Soil Gas Investigation, Jamar Service Station, 4075 East Main Street, <br /> Stockton,California <br /> Dear Ms. Marin: <br /> Cardno ATC has prepared this Workplan, on behalf of Mr. Jay McIlrath, for performing soil gas <br /> sampling at the subject site. The purpose of the soil gas sampling is to determine potential risks to <br /> current and potential future occupants at the site and nearby residences. This work is being done at the <br /> request of the San Joaquin County Environmental Health Department(SJCEHD). <br /> The scope of work in brief includes advancing fourfgsour borings, collection and analysis of soil vapor <br /> samples, and preparation of a report detailing site activities and results. The scope of work is described <br /> in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located on the north side of East Main Street and the west side of South Oro Avenue in <br /> Stockton, California, (Figure 1). The location is a residential and commercial area. The site is <br /> currently utilized as a gas station and convenience store. <br /> SITE HISTORY <br /> In 1995, one 350-gallon underground storage tank (UST) used to store waste oil and one 500-gallon <br /> UST used to store kerosene were removed from the site. <br /> In December 1998, two 6,000-gallon and one 10,000-gallon USTs used to store gasoline were removed <br /> from the site. Petroleum hydrocarbons were detected in soil samples collected from the UST pit. The <br /> excavation was subsequently backfilled and a 20,000-gallon UST was installed. <br /> In September 1999, John P. Cummings&Associates(JPCA)advanced three soil borings(MW 1,MW2, <br /> and MW3) to depths ranging from approximately 74 to 78 feet below ground surface (bgs). The <br /> borings were completed as groundwater monitoring wells. <br /> S:1 823Vepo AJ=ar-2015 SVIS W .doc 1 Cardno ATC <br />