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23 <br /> 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 /> May 28, 1997 <br /> Mr. and Mrs. Roy Knoll <br /> Roy's Towing <br /> 3570 East Miner Avenue <br /> Stockton, CA 95205 <br /> Subject: Cost Estimate & Change Order Request for Supplemental Soil Sampling at Roy's <br /> Towing, 3570 East Miner Avenue, Stockton, California <br /> Dear Mr. and Mrs.. Knoll: <br /> Despite Doug Wilson's apparent aversion to considering any remedial alternative other than <br /> excavation, he has agreed that we should have a better handle on the volume of contaminated <br /> soil before proposing any particular remediation. This cost estimate is for additional soil <br /> sampling to determine two things: <br /> 1) The actual lateral limits and depths of contamination. With this information we <br /> will know the actual number of cubic yards that must be dealt with in one fashion <br /> or another. <br /> 2) The solubility of the lead when 'leached by water as opposed to the citric acid <br /> used in the STLC method. This information will help in evaluating possible <br /> chemical/physical treatment techniques. <br /> The proposed workscope consists of collecting soil samples at depths of 1,2,3 and 4 feet below <br /> grade from seven (7) locations using direct push drilling equipment and submitting all soil <br /> samples from the depth of 1 foot for laboratory analysis of soluble (STLC) lead. This work <br /> should establish the lateral limits of soil contamination at the depth of 1 foot. At sampling <br /> locations where the 1 foot sample exceeds the STLC level of 5 parts per million, the samples <br /> from 2, 3, and 4 feet will also be analyzed. These samples should establish the actual "floor" <br /> to the soil contamination (presently we know it is somewhere between 1 and 5 feet). The cost <br /> estimate assumes that a total of 15 samples will be analyzed for STLC lead. <br /> g roundze\roy'stow\costest <br />