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L ;,r' 11 <br /> Quincy Engineering, Inc. TaberSince 1954 <br /> November 26, 2003 <br /> 1P2/399/245-4 <br /> • All samples exceeding 50 mg/kg total lead will be analyzed for soluble lead by <br /> method 6010 using the waste extraction test (WET) extraction method with citrate <br /> buffer. <br /> • All samples exceeding 100 mg/kg total lead will be analyzed for soluble lead by EPA <br /> Lmethod 6010 using the TCLP extraction method. <br /> • Ten percent of all samples, randomly selected, will be analyzed for pH using EPA <br /> method 9045. <br /> L7.0 REPORT OF FINDINGS <br /> Following the field and laboratory programs, a report will be prepared presenting <br /> our technical approach, field findings, sample locations, copies of the analytical <br /> Llaboratory reports, tabular summary of the results, and statistical analyses of the <br /> results, along with our conclusions regarding the likely extent and significance of <br /> Lcontaminants (per State and Federal hazardous waste criteria). Statistical analyses will <br /> be limited to evaluation of the average concentration and 90 and 95% upper confidence <br /> limits of results for total analyses lead by the non-parametric "bootstrap" method, using <br /> Lthe Excel spreadsheet tool "Bootstrap3 04-4874G1-VT" (provided for our use by <br /> Caltrans District 4) and correlation between total and soluble lead concentrations. <br /> L <br /> LTABER CONSULTANTS <br /> Thomas M. Skaug <br /> Senior Geologist <br /> L C.E.G. 1996 <br /> R.E.A. 04317 <br /> LTMS/ns <br /> Attachments: Figure 1 Site Location Map <br /> Appendix A Project Plans Annotated With Sample Locations <br /> f Appendix B Health and Safety Plan <br /> L <br /> 7 <br />