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0 4 0 <br /> AEGIS ENVIRONMENTAL , INC . <br /> 801 Riverside Avenue,Suite C, Roseville,CA 95678 ♦ 916.782-21101916.969-2110/FAX 916.786-7830 <br /> 29 March 1991 <br /> L 'P'L!' <br /> Mr. Steve Schneider APR 3 1991 <br /> San Joaquin County Public Health Services ENVIRONMENTAL HEALTH <br /> Environmental Health Division PERMIT/SERVICES <br /> Post Office Box 2009 <br /> 445 North San Joaquin Street <br /> Stockton, California 95201 <br /> Re: ADDENDUM TO SITE ASSESSMENT REPORT, 4 JANUARY 1991 <br /> DISPOSITION OF SOIL CUTTINGS AND WELL DEVELOPMENT WATER <br /> Shell Service Station (WIC #204-7525-0104) <br /> 6131 Pacific Avenue, Stockton, California <br /> Dear Mr. Schneider: <br /> At your request, Aegis Environmental, Inc. (Aegis) is providing this addendum to the Site <br /> Assessment Report prepared by Aegis, dated 4 January 1991. The purpose of this <br /> addendum is to address the disposition of soil cuttings related to borings drilled on site <br /> and water related to the development of the on-site ground water monitoring wells. <br /> On 12 and 13 July 1990, a total of five (5) borings were drilled at the subject site. The <br /> borings were completed as monitoring wells 1, 2 and 3 and vapor extraction wells 1 and <br /> 2. During drilling, approximately 8 yds3 of drill cuttings were daylighted. The cuttings <br /> were placed on, and covered by plastic (visquene) in order to inhibit uncontrolled <br /> aeration. <br /> Analytical results of the soil samples collected during drilling indicated that the soils would <br /> be appropriately disposed of at a Class 2 Landfill. It was suspected that these results <br /> may not have been representative of the stockpiled soil cuttings, and a subsequent <br /> sampling program was performed. The results of the subsequent sampling indicated that <br /> the soils were low-level, petroleum impacted materials and were therefore suitable for <br /> disposal at a Class 3 Landfill facility. Copies of the subsequent analytical results are <br /> attached. <br /> On 20 September 1990, the drill cuttings were trucked to the West Contra Costa Sanitary <br /> Landfill. Copies of the bill-of-lading, gate fee receipt and waste profile form are attached. <br /> 90-020H.LTR <br /> GEOLOGISTS • ENGINEERS • GROUND WATER SCIENTISTS <br />