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eological Oechnics I <br /> 1101 7'"Street <br /> Modesto,CA 95354 <br /> 209.522.4119 <br /> 209.522.4227(fax) <br /> gti@geologicaltechnics.com <br /> September 22, 2004 <br /> Project No.: 425.2 <br /> Project Name: George's Service <br /> George and Mei Teranishi <br /> 1600 Dhurham Ferry Road <br /> Tracy, CA 95376 <br /> RE: Plan Addendum: Pre Bench Scale/Pilot Testing <br /> Location: George's Service Station, 1600 Dhurham Ferry Road, Tracy, CA <br /> Dear Mr. &Mrs. Teranishi, <br /> Geological Technics Inc. is pleased to present the Plan Addendum for Pre Bench Scale/Pilot <br /> Study Testing. This will determine if the bench scale testing is needed or if it can be skipped <br /> and we could proceed directly to the pilot study. <br /> Soil and groundwater samples will be obtained as described in the work plan dated August 16, <br /> 2004. These samples will be tested for the following type of analyses: <br /> 1. CAM 17 Metals: antimony, arsenic, barium, beryllium, cadmium, chromium (III and <br /> VI), cobalt, copper, lead, mercury, molybdenum, nickel, selenium, silver, thallium, <br /> vanadium, and zinc. <br /> 2. General Minerals: Nitrate, TKN, sulfate, total hardness, total alkalinity, Ca, Mg, Na, Fe, <br /> Mn, P, K, hydroxide, carbonate, bicarbonate, and chloride. <br /> 3. pH and EC. <br /> 4. The soil will be screened for particle size using standard sieve analysis methods. <br /> After the soil and water analysis from a certified lab, the results will be submitted to Mr. Angus <br /> E. McGrath, Principal Geochemist of SECOR International Incorporated for his evaluation. <br /> Mr. Angus will prepare a report that will include an analysis of the metal concentrations, <br /> compilation of results from other studies, comparison of those results to the soil data (George's <br /> service soil data), discussion of the factors limiting the effectiveness of the chemical oxidation. <br /> Geological Technics will submit a complete report within three weeks after receiving the report <br /> from SECOR International Incorporated, which will include the required objectives. If you <br /> have any questions regarding this addendum,please contact me at 209-522-4119. <br /> Thank you: <br /> t!_ <br /> Mandeep Singh l r <br /> rr <br /> Project Engineer ��` �. <br />