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& Associates, Inc. <br /> Environmental scientists and Engineers C <br /> September 20, 1993 <br /> 1685-030 <br /> Mr. Russell Chapin <br /> Chapin Brothers, Inc. <br /> 1203 N. Carlton Avenue <br /> Stockton, California 95203 <br /> Subject: Quarterly Update Report <br /> 1766 Monte Diablo <br /> Stockton, California <br /> Dear Mr. Chapin: <br /> This letter represents the required quarterly status report for the pending site remediation project <br /> located at 1766 Monte Diablo Avenue in Stockton, California. On August 4, 1993, Walsh & <br /> Associates, Inc. (WALSH) assisted with the removal of two 8,000-gal and two 4,000-gal <br /> underground gasoline storage tanks, and collected a total of six soil samples from the base of the <br /> excavation. WALSH returned to the site on August 6, to collect one soil sample from beneath <br /> a 550-gallon underground waste oil tank, and one sample from beneath the waste oil delivery <br /> line. With the exception of the waste oil pipeline sample, which was collected in situ, all of these <br /> samples were collected from the backhoe bucket using a hand-operated percussion core sampler. <br /> Selected samples were analyzed by a state-certified environmental laboratory and a letter report <br /> was submitted to San Joaquin County Environmental Health Division (SCEHD). The results of <br /> the laboratory analyses are listed in Table 1 of this quarterly update report. <br /> Contaminated soil generated by the tank removal was transported to the owners property at 1660 <br /> Beyers Road, east of the city of Stockton. The soil was stockpiled in a containment structure <br /> constructed from bales of hay and plastic sheeting. Five composited soil samples were collected <br /> from the stockpiled soil for laboratory analysis (Table 1). Because contaminant concentrations <br /> were all less than 50 parts per million total petroleum hydrocarbons, the San Joaquin Valley <br /> Unified Air Pollution Control District authorized uncontrolled soil aeration for the stockpiled soil. <br /> West Coast Division: <br /> 1734 34th Street . Suite B . Sacramento, California . 95816 . Phone (916) 737-7240 . FAX (916) 737-7245 <br /> Corporate Office: <br /> 4888 Pearl East Circle . Suite 108 . Boulder, Colorado . 80301-2475 . Phone (303) 443-3282 . FAX (303) 443-0367 <br />