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15 May 2008 <br /> AGE-NC Project No. 96-0254 <br /> Page 2 of 2 <br /> One soil boring (OZ-1) will be advanced on-site for the purpose of soil sample collection for an <br /> ozone bench scale test. Soil samples selected for analyses will be collected from the saturated zone, <br /> between approximately 15 and 35 feet below surface grade. It is proposed that up to twelve soil <br /> samples will be selected for analyses. Soil samples from each interval will be utilized for the Ozone <br /> Injection Bench Scale Study.Procedures for the advancement of the soil boring and for soil sampling <br /> are attached in Appendix B. <br /> Ground water samples representative of the dissolved hydrocarbon plume will be collected in <br /> accordance with sampling procedures described in previous quarterly monitoring reports, and in <br /> compliance with the Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines <br /> for sampling. Ground water samples from MW-1 B and MW-4 monitoring wells will be used for the <br /> ozone injection bench scale test. Ground water sampling procedures are attached in Appendix B. <br /> Adequate ground water samples will be collected for analysis also to include the general mineral <br /> parameters, and for utilization during the proposed Ozone Injection Bench Scale Study. The <br /> shipment of the samples to a laboratory for analysis will occur within 24 hours of sampling. <br /> Procedures for the Ozone Injection Bench Scale Study are attached in Appendix C. <br /> A geochemical evaluation(GE) of the Ozone Injection Bench Scale Study will be prepared by the <br /> analytical laboratory; it will present the results of tests for the formation of by-products and the <br /> potential for contaminant reduction, with generalized worst case reactions. The report will be in a <br /> format acceptable to the CVRWQCB, and will be reviewed by a California Professional Geologist. <br /> Upon completion of the proposed scope of work,a report of findings will be prepared and submitted <br /> to the EHD for consideration of permanent ozone injection system operation and monitoring. <br /> Upon approval of the work plan, AGE will submit a drilling permit and application fee to the <br /> appropriate agency. If you have any questions or require further information, please contact our <br /> office at (209)467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental,Inc. �Sxo GE <br /> QQOF���pM R. <br /> * No. 7473 <br /> Lauren D. `dinalli- William R. Little <br /> Staff Geologist Senior Project Geologist sigT Pis <br /> California Professional GeoloF' 'o 473 <br />