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Roy's Towing <br /> Page 2 <br /> I have also included in the cost estimate analysis of 2 samples for pH and STLC lead using <br /> water as the extraction liquid (instead of citric acid). This should be helpful in determining the <br /> actual solubility of the lead under more representative conditions. The same samples would also <br /> be analyzed for TCLP lead (Federal method for determining soluble hazardous waste criteria). <br /> The TCLP is used by some waste disposal facilities as a pricing determinent and this information <br /> should be available to us. <br /> Our cost estimate for the workscope outlined is $ 4,615. The attached Exhibit A provides more <br /> detail on the estimated costs. <br /> We can begin work upon your authorization of this change order request. If you have any <br /> questions or comments please contact me at your earliest convenience. <br /> Sincerely, <br /> Ground Zero Analysis, PC. <br /> Gregory P. Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 <br /> Attachment <br /> groundze\roy'stow\costest <br />