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1433 North Market Boulevard <br /> Sacramento, CA 95834-1943 <br /> Tel. 916.928.3300 <br /> ® Fax.916.928.3341 <br /> 4� <br /> thev;group. <br /> February 25, 2000 <br /> Project 911-011.1B <br /> Mr. Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road <br /> Roseville, Califomia 95661 <br /> Re: Site Assessment Report <br /> Tosco (Former Unocal) Service Station #4409 <br /> 1502 North El Dorado <br /> Stockton, California <br /> Dear Mr. Ralston: <br /> This letter, prepared by IT Corporation (IT) on behalf of Tosco Marketing Company (Tosco), <br /> presents the site assessment work at the site referenced above (Figure 1). The purpose of this <br /> work was to define the vertical and horizontal extent of gasoline hydrocarbons in soil and <br /> groundwater at the subject site. This was accomplished by installing four monitoring wells <br /> (MW-1 through MW-4). This investigation was conducted in response to a letter from the San <br /> Joaquin County Public Health Department, Environmental Division (SJCPHDIEHD) dated <br /> August 23, 1999. <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 /> samples 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 /> S, 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 SJCPHDIEHD. <br />