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IT Corporation <br /> d 1326 North Market Boulevard <br /> 5deramento, CA 95834-1912 <br /> Tel 916 928 3300 <br /> *,he Fax 916 928 3341 <br /> (t;group. <br /> 1 Af(mber of The IT Group <br /> April 16, 2001 <br /> Project 911-011 113 <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> Re Vertical Assessment Report <br /> Tosco (Former Unocal) Service Station#4409 <br /> 1502 North El Dorado <br /> Stockton, California <br /> I <br /> Dear Mr Ralston <br /> This letter,prepared by IT Corporation(IT) on behalf of Tosco Marketing Company(Tosco), <br /> presents the results of additional site assessment work at the site referenced above (Figure 1) <br /> The purpose of this work was to define the vertical extent of gasoline hydrocarbons in soil and <br /> groundwater at the subject site by installing and sampling three on-site deep zone groundwater <br /> monitoring wells (MW-5 through MW-7) Proposed off-site well MW-8 was not installed due to <br /> subsurface utility locations beneath the Harding Way median and City of Stockton concerns <br /> regarding drilling in traffic lanes <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 underground storage tanks (USTs)were removed from the site during <br /> UST divestment activities The tanks were 10,000-gallon capacity with two containing gasoline <br /> and one containing diesel The USTs were removed by John's Excavating of Santa Rosa, <br /> California The UST excavation was approximately 35 feet by 40 feet by 15 feet deep Six soil <br /> samples were collected from beneath the removed USTs on April 7, 1999 The excavation was <br /> deepened beneath the center of the western tank to approximately 18 feet below ground surface <br /> (bgs) and one additional soil sample was collected to confirm that petroleum hydrocarbon <br /> impacted soil was removed All soil samples from the base of the UST excavation were non- <br /> detect for petroleum hydrocarbons <br />