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FROM : Grnund. Ze Ano l ys i 8 PHONE N0. 209 952 9892 Jl.ri. 0E; 997 02:24PM P2 <br /> GROUND ZMO ANALYSIS, INC. <br /> 2291 W.Msrcb Lwne, Butte 127D <br /> Stoddoa, caffornia 95207 <br /> Telephow; C.t09) 952-3481 <br /> Facsimile: (209) 952.9892 <br /> June 5, 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 and <br /> Treatment Testing at Roy's Towing, 3570 East Miner Avenue, Stockton, <br /> California <br /> Dear Mr. and Mrs. Knoll: <br /> Following our phone conversation, I have modified my cost estimate to reflect a reduction in the <br /> proposed delineation sampling and the addition of bench testing for soil treatability. The two <br /> objectives of the proposed work are as follows: <br /> 1) Determing more accurately the actual lateral limits and depths of contamination. <br /> With this information we will know the actual number of cubic yards that must <br /> be dealt with in one fashion or another. <br /> 2) Investigate the suitability of chemical stabilization to immobilize the soluble lead <br /> in the soil. The solubility of the lead when leached by water as opposed to the <br /> citric acid used in the STLC method will also be determined. <br /> Furthgr DFlinefig-n',_ <br /> The proposed workscope consists of collecting soil samples at depths of I foot below grade from <br /> six (6) locations using; a backhoe 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 the location <br /> of the previous sample "A" samples from depths of 2, 3, and 4 feet will also be collected and <br /> analyzed. These samples should establish the actual "floor" to the soil contamination (presently <br /> we know it is somewhere between 1 and 5 feet). <br /> tra,n�e4oy'sro�vloade�t <br />