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i <br /> i <br /> y 'Corporation <br /> 1433 North Market Boulevard <br /> Sacramento, CA 95834-1943 <br /> � Tel 916 928 3300 <br /> he Fax 916 928 334I <br /> (Irl"Aroup. <br /> A Member of The IT Croup <br /> May 16, 2000 p� . <br /> Prol ect 911-011 1 B <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road <br /> Roseville, California 95661 <br /> Re Additional Site Assessment Work Plan <br /> Tosco (Former Unocal) Service Station#4409 <br /> 1502 North El Dorado <br /> Stockton, California <br /> Dear Mr Ralston <br /> Tlus letter, prepared by IT Corporation (1T) on behalf of Tosco Marketing Company (Tosc,o), <br /> presents a work plan describing proposed additional site assessment work at the site referenced <br /> above (Figure 1) The purpose of this work is to define the vertical extent of gasoline <br /> hydrocarbons in soil and groundwater at the subject site This will be accomplished by installing <br /> three geoprobe borings (GP-1 through GP-3) <br /> SITE BACKGROUND <br /> The site is located on the northeast corner of Harding Way and El Dorado Street in Stockton, <br /> California The site is a former Unocal service station that retailed gasoline and diesel fuel <br /> On April 7, 1999, three USTs were removed from the site during UST divestment activities The <br /> tanks were 10,000-gallon capacity with two containing gasoline and one containing diesel The <br /> USTs were removed by John's Excavating of Santa Rosa, California The UST excavation was <br /> approximately 35 feet by 40 feet by 15 feet deep Six soil samples were collected from beneath <br /> the removed USTs on April 7, 1999 The excavation was deepened beneath the center of the <br /> western tank to approximately 18 feet below ground surface (bgs) and one additional soil sample <br /> was collected to confirm that petroleum hydrocarbon impacted soil was removed All soil <br /> sample from the base of the UST excavation were ND for petroleum hydrocarbons <br /> Soil samples were collected from beneath the removed dispensers and associated piping on April <br /> 8, 1999 During additional excavation activities unidentified fiberglass piping was encountered <br /> The piping was removed and soil samples were collected at the direction of Mr Michael Infurna <br /> of San Joaquin County Public Health Services, Environmental Health Division(SJCPHS/EHD) <br />