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GROUND ZERO ANALYSIS, INC. <br /> 2291 W. March Lane, Suite 127D <br /> Stockton, California 95207 <br /> Telephone: (209) 952-3481 <br /> Facsimile: (209) 952-9892 <br /> December 3, 1996 <br /> Mr. and Mrs. Roy Knoll <br /> Roy's Towing <br /> 3570 East Miner Avenue <br /> Stockton, CA 95205 <br /> Subject: Third Revised Cost Estimate for Soil Sampling at Roy's Towing <br /> 3570 East Miner Avenue, Stockton, California <br /> Dear Mr. and Mrs. Knoll: <br /> Doug Wilson has indicated that our Workplan Addendum, prepared in response to his 10/30/96 <br /> comment letter, will be acceptable provided we analyze samples by EPA method 8240. He has <br /> agreed to drop the requirement to analyze samples by EPA 8010/8020 as this is redundant. This <br /> cost estimate reflects the changes in the proposed workscope per his request. <br /> The modified workscope consists of collecting soil samples at depths of 1 and 5 feet below <br /> ground surface from ten (10) locations with a backhoe and hand auger; collecting samples from <br /> one drilled boring at depths of 25, 30 and 40 feet and collecting two (2) samples from the septic <br /> tank; submitting all soil samples (25) for laboratory analysis for total recoverable petroleum <br /> hydrocarbons (TRPH, EPA method 418.1) and total lead; additionally analyzing eleven (11) <br /> samples for volatile organics (EPA method 8240), total petroleum hydrocarbons as gasoline <br /> (TPHg) and diesel (TPHd); and preparing a report detailing findings, conclusions, and <br /> recommendations. The cost estimate assumes that up to four (4) soil samples may need to be <br /> analyzed for soluble threshold limit concentration (STLC) lead. Per my discussions with Roy, <br /> we are assuming that you will provide and operate the backhoe. <br /> Our cost estimate for the workscope outlined is$ 12,203. The attached Exhibit A provides more <br /> detail on the estimated costs. <br /> groundzeVoy'stowkosten <br />