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i <br /> Mobil Oil Corporation 3800 WEST ALAMEDA AVENUE,SUITE 700 <br /> BURBANK,CALIFORNIA 91505-4331 <br /> January 3 , 1991 <br /> Ms. Diane Hinson FORMER MOBIL BULK PLANT <br /> San Joaquin Co. 500 EAST GRANTLINE ROAD <br /> Pubric Health Services TRACY, CALIFORNIA <br /> Enviromental Health Division <br /> Post Office Box 2009 <br /> Stockton, CA 95201 <br /> — Dear Ms. Hinson: <br /> Enclosed for your review are the Soil Excavation and <br /> Preliminary Ground Water investigation Report and a Work <br /> Plan for Additional Site Investigation, for the subject <br /> site. <br /> Work performed at the site included in-situ characterization <br /> and excavation of diesel and gasoline contaminated soil , and <br /> installation of 4 ground water monitoring wells. Soil <br /> sampling data indicates that all of the soil with elevated <br /> levels of petroleum hydrocarbons within the confines of the <br /> site has been removed. Only one of the wells (AW-3) had <br /> detectable levels of dissolved TPH and BTEX, though the <br /> concentrations for the BTEX compounds were below state <br /> action levels. <br /> Borings and monitoring wells are proposed to characterize 3 <br /> soil and ground water contamination offsite. The work is <br /> planned for early February 1991. If we do not receive a <br /> response by the end of January 1991, we will assume you have <br /> no 'objections to the work. <br /> Please call if you have questions. <br /> Sincerely, <br /> A n Mark P. Ausburn = <br /> Senior Staff <br /> _ J ;r '' Hydrogeologist <br /> MPA/st <br /> Attach. p 3 <br /> _,3 <br />