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�y ROGER FOOTT ASSOCIATES, INC. EXHIBIT A <br /> 1450 Harbor Blvd., Suite G <br /> West Sacramento, CA 95691 <br /> (916) 325-2580 <br /> FAX (916) 325-2570 <br /> October 31, 1990 <br /> 2097-P <br /> Chapin Brothers, Inc . <br /> 1203 North Carlton Avenue <br /> Stockton, California 95203 <br /> Attention: Mr. Russell F. Chapin <br /> Subject : Proposal for Subsurface Environmental <br /> Investigation <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> Dear Mr. Chapin: <br /> This proposal presents our understanding of the status <br /> of a service station located at 1766 Monte Diablo Avenue in <br /> Stockton, California, and describes a proposed subsurface <br /> environmental investigation necessary to evaluate whether <br /> contamination of soil and groundwater has occurred and to <br /> define the degree and lateral extent of contamination at the <br /> site. The site includes two 4,000-gallon and two 8,000- <br /> gallon underground storage tanks and one underground waste <br /> oil tank which are 16 to 40 years old. The site was <br /> i <br /> formerly operated by Shell Oil Company . <br /> Evaluation of contamination is desired in association <br /> with the proposed sale of the site. We propose an <br /> environmental investigation which will include drilling six <br /> soil borings and installation of four groundwater monitoring <br /> wells in four of the borings . Soil borings will be drilled <br /> to the groundwater surface using a drilling rig equipped <br /> with 6- to 8-inch diameter hollow stem augers . Based on our <br /> experience in the area, we anticipate that groundwater will <br /> be 10 to 15 feet below surface grade at the site. Soil <br /> borings to be converted into monitoring wells will be <br /> extended to a point approximately 10 feet below the <br />