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n _ 01copporation <br /> 1326 North Ndrket Boulevard <br /> Oil Sacramento, CA 958.14-1911 <br /> Tel 916 928 3300 <br /> *he Iax 916 928 3341 <br /> i r� s <br /> (tigroup. <br /> tLG 1 ill � � 491 Member of The If Groep <br /> July 6, 2001 <br /> Project 828800 <br /> Mr Ed Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> Re Groundwater Assessment Work Plan <br /> Tosco (Former Unocal) Service Station #4409 <br /> 1502 North El Dorado <br /> Stockton, California <br /> Dear Mr Ralston <br /> This letter, prepared by 1T Corporation (1T) on behalf of Tosco Marketing Company (Tosco), <br /> proposes further groundwater assessment activities at the site referenced above (Figure 1) The <br /> purpose of this work is to define the extent of dissolved petroleum hydrocarbon impacts to <br /> y groundwater at the subject site This will be accomplished by installing three groundwater <br /> monitoring wells (MW-8 through MW-10) at depths of approximately 80 feet below ground <br /> surface (bgs) <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 bgs and one additional <br /> soil sample was collected to confirm that petroleum hydrocarbon impacted soil was removed <br /> All soil samples from the base of the UST excavation were non-detect for petroleum <br /> hydrocarbons <br /> Sail 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 /> . rf COANPO anon <br /> SAC 1N 1sacDP120011PRAPJ81828800 1 as doc-Mit 1 Rev 0,07/06/01 <br /> (01000000) <br />