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15 October 2003 <br /> AGE-NC Project No. 95-0103 <br /> Page 2 of 2 <br /> assessment and mitigation of the soil contamination under the building, by soil vapor <br /> extraction or if feasiblely established by soil excavation,would be required. <br /> 4. The continual removal of ground water was not concurred by the Board.The Board indicated <br /> that soil vapor extraction was the most effective measure to remove contamination from the <br /> site, over and compared to the ground water extraction. The Board recognized the need to <br /> remove contamination within the saturated zone,possibly utilizing dual-phase extraction of <br /> both soil vapor and ground water.However,the Board recommended a soil vapor extraction <br /> rebound pilot study, along with additional soil vapor or soil sampling under the subject <br /> building. <br /> 5. A ground water extraction"hiatus"was also recommended by the Board. The ground water <br /> extraction and treatment system will be shut down for thirty-days to determine if an <br /> increasing concentration would be observed. Sampling prior to the hiatus would be required <br /> to evaluate changes in concentrations. <br /> 6. The EHD advised that a mass calculation of the pre-ground water extraction process should <br /> be generated, allow for a mass percentage removal-analysis by the SVE and ground water <br /> extraction systems. <br /> AGE agreed to review the SVE system, through pilot testing, and arrange for additional site <br /> assessment under the building at the site. <br /> If you have any questions or require further information,please contact our office at(209)467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. �\S�tyU GE /0 <br /> \aM R. <br /> AM4,e <br /> * No.7473 <br /> William R. Little <br /> Senior Project Geologist `��� �l►`Q <br /> California Registered Geologist No. 7 F C1►L�EOQ, <br /> Enclosures <br /> cc: Mr. Russell Chapin <br /> Mr. James Barton, Regional Water Quality Control Board - Central Valley Region <br />