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10 February 2009 <br /> AGE-NC Project No. 95-0173 <br /> Page 4 of 8 <br /> 2.3. INSTALLATION OF SVE REMEDIATION WELLS VF WARRANTED) <br /> Soil borings B-11,B-12 and B-13 are proposed to be advanced to depths of 40 feet bsg (estimated <br /> depth to first encountered groundwater).If the situation should arise where significant hydrocarbon- <br /> impact is encountered from any of the three soil borings, then"AGE proposes to convert the <br /> �-5 hydrocarbon-impacted soil borings into 2-inch diameter SVEwells,screened between 15 and 35 feet <br /> fs�v bsg• -c <br /> fit.. . <br /> Upon completion,newly installed S E wells will be connected to the existing manifold SVE piping <br /> network, and SVE remediation operations resumed. Addition of these SVE wells into the existing <br /> interim SVE remediation system should augment the extraction of remaining soil vapor from the <br /> core-area of petroleum-impacted soil beneath the former UST area and increase overall SVE <br /> efficiency. <br /> 2.4. SOIL VAPOR EXTRACTION REBOUND TEST <br /> SVE operations have been suspended at the site since November 2006,therefore performance of an <br /> SVE rebound test is warranted at this time. SVE and IAS operations should be re-started and allowed <br /> k to operate for a period for 24-hours(one day).Following 24-hours of operation, SVE_concentrations <br /> 2�. should be monitored and sampled from vapor extraction wells VW-1 througYVW-7.Following_ <br /> sample collection, SVE operations will be suspended for evaluation of SVE samples. <br /> 2.5. REPORT PREPARATION <br /> Results of soil boring advancement and SVE well installations (if warranted) will be presented in <br /> a report of findings. The report will be in a format acceptable to the RWQCB(Appendix A -Reports, <br /> Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of <br /> Underground Storage Tank Sites), and will be reviewed and signed by a California Professional <br /> Geologist. <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of a California <br /> Professional Geologist. Procedures for soil boring advancement, soil vapor sample collection, soil <br /> sample collection, SVE well installation (if warranted), and SVE rebound testing procedures are <br /> described below. <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />