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• CevloAdt Technics <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(Durham Ferry) <br /> George and Mei Teranishi <br /> 1.600 Durham Ferry Road <br /> Tracy,CA 95376 <br /> RE: Work 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 Work Plan Addendum for Pre Bench Scale/Pilot Study Testing. <br /> This will determine if the bench scale testing is needed or if it can be skipped and we could proceed directly to <br /> the pilot study. <br /> Soil and groundwater samples will be obtained as described in the work plan dated August 16, 2004. These <br /> samples will be tested for the following type of analyses: <br /> 1. CAM 17 Metals: antimony, arsenic, barium, beryllium, cadmium, chromium (III and VI), cobalt, copper, <br /> lead, mercury, molybdenum,nickel,selenium, silver,thallium, vanadium, and zinc. <br /> 2. General Minerals: Nitrate, TKN, sulfate, total hardness, total alkalinity, Ca, Mg, Na, Fe, Mn, P, K, <br /> 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 is complete, the results will be submitted to Mr. Angus E. <br /> McGrath,Principal Geochemist of SECOR International Incorporated for his evaluation. Mr. Angus will prepare <br /> a report that will include an analysis of the metal concentrations, compilation of results from other studies, <br /> comparison of those results to the soil data(George's Service soil data), and discussion of the factors limiting the <br /> effectiveness of the chemical oxidation. <br /> Geological Technics will submit a complete report within three weeks after receiving the report from SECOR <br /> International Incorporated, which will include the required objectives. If you have any questions regarding this <br /> addendum, please contact me at 209-522-4119. <br /> Thank you: <br /> MandeelpSingh <br /> Project Engineer <br /> Cc: Jim Barton—RWQCB <br /> Nuel Henderson—SIC PHS/EDH F <br /> ca. <br />