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' e 40th BROWN AND CALDWELL Anniversary 1947-1987 <br /> CONSULTING ENGINEERS Service • Excellence • Efficiency <br /> October 15 , 1987 <br /> Mr . Harlan Knoll <br /> San Joaquin County Local <br /> Health District <br /> 1601 East Hazelton Avenue <br /> Post Office Box 2009 <br /> Stockton, California 95201 017-3346-02/4 <br /> Subject: ARCO Service Station 595, 6100 North <br /> Highway 99, Stockton, California <br /> Dear Mr . Knoll: <br /> Enclosed are the analytical results of soil samples taken during <br /> waste oil tank removal at the subject site. The site location is <br /> shown on Figure 1. The sampling location is shown on Figure 2. The <br /> analytical results are summarized in Table 1. <br /> On September 25 , 1987 , W. F. Lewis Construction Inc. (W. F. Lewis) <br /> removed one 280-gallon steel waste oil tank from the subject site. <br /> The tank had little corrosion and was intact during its removal. <br /> There was no evidence of waste oil leakage. The tank was emptied of <br /> remaining waste oil and filled with dry ice prior to its removal. <br /> W. F. Lewis personnel triple rinsed the tank and hauled it, intact, <br /> to Triangle, Inc. , of Sacramento. San Joaquin County Local Health <br /> District (County) and Brown and Caldwell (BC) personnel were on site <br /> during tank removal. The soil generated during waste oil tank <br /> excavation and removal was stockpiled on site, pending sample <br /> collection. <br /> On September 25 , 1987 , BC personnel collected one soil sample from <br /> the bottom of the excavation at a depth of 8 . 0 feet. The sample was <br /> collected under the direction of County personnel. After the soil <br /> sample was collected, the stockpiled soil was used, under the <br /> direction of County personnel, to backfill the excavation. The <br /> excavation was backfilled on September 25, 1987. <br /> The soil samples were submitted to California Department of Health <br /> Services-certified Eureka Laboratories, Inc. , in Sacramento. The <br /> samples were analyzed for solvents (U.S. Environmental Protection <br /> Agency (EPA) Method 8010) , total petroleum fuel hydrocarbons (EPA <br /> 8015 , modified) , benzene, toluene, and xylene (BTX) (EPA 8020) , and <br /> polychlorinated biphenyls (PCBs) (EPA 8080 PBCs zonly) . <br /> V T' <br /> 6 Li <br /> 0 <br /> O'-IT 7 <br /> 723 S STREET SACRAMENTO,CA 95814 • (916)444-0123 ENVI ROM ENTAL HEALTH <br /> FERMIT/SERVICES <br />