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Harding Lawson Associates - <br /> May 17, 1988 <br /> 4167,218.01 <br /> San Joaquin County Environmental Health <br /> 1601 E. Hazleton Avenue <br /> Stockton, California 95201 <br /> I <br /> Ladies and Gentlemen:, j <br /> Enclosed is a monitoring well permit application to drill three <br /> wells at the Wickland Oil Company Service Station located at 6425 <br /> Pacific Avenue in Stockton, California. <br /> Two borings will be drilled to a maximum depth of 25 feet along <br /> the northwest and southwest property corners identified as MW-1 <br /> and MW-2 on the attached 'Site Plan. If ground water is not <br /> encountered, a soil sample will be collected form each boring from <br /> the soil containing the highest level of petroleum constituents as <br /> determined by field screening with a photoionization detector. If <br /> field screening does not detect petroleum constituents, the soil <br /> sample shall be representative of the soil :in the boring. The <br /> soil samples will be analyzed for Benzene, Ethylbenzene, Toluene, <br /> and Xylenes (BETX) and total petroleum hydrocarbons (TPH) . The <br /> borings will be abandoned by grouting to the surface using a=cement <br /> and bentonite mixture. <br /> If ground water is encountered above 25 feet, the two borings will . <br /> be converted into monitoring wells. An additional well will be <br /> drilled at the location labeled MW-3 on the Site Plan. The wells_ <br /> will be developed and the ground water flow direction will be <br /> determined. All three wells will then be sampled and analyzed for <br /> BETX. <br /> If you have any questions, please call me at 415/892-0821. <br /> Yours very truly, <br /> HARDING LAWSON ASSOCIATES <br /> Thomas R. Williams 1 <br /> Senior Geologist <br /> TRW/mr "'�LTH <br /> ENFIERM-1/SER CES <br /> Enclosures <br /> Engineers 7655 Redwood Blvd. Telephone Alaska Hawaii Telecopy <br /> i and PO.Box 578 415/892-0821 ° !j California Nevada 415/892-0831 <br /> I Geoscientists Novato,CA 94948 Telex 340523 Colorado Texas <br /> i <br />