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1.0 <br /> California Stop Page 3 <br /> 2224 Manthey Road August 31, 2011 <br /> Stockton, California 95206 <br /> for field monitoring of VOCs using an OVA-PID. AGE proposes to analyze select soil samples <br /> for TPH-g, BTEX, MTBE, TAME and TBA. Following the installation of the SVE wells, AGE <br /> proposes to perform an 8-hour SVE pilot test, applying a vacuum to one of the SVE wells <br /> while using the two other SVE wells and monitoring wells MW-1 and MW-8 as observation <br /> wells to measure the induced vacuum. AGE proposes to monitor for VOCs and collect <br /> influent vapor samples in Tedlar bags at the start-up and at two-hour intervals thereafter to be <br /> analyzed for TPH-g, BTEX and MTBE. The EHD approves the SVE pilot test as submitted. <br /> AGE proposes to install two ozone injection wells at locations illustrated on Figure 2 of the <br /> SVE/OZ work plan while collecting soil samples at five-foot intervals beginning at five feet bsg <br /> for lithologic characterization during the advancement of the boreholes to total depth of <br /> approximately 27 feet bsg. AGE proposes to analyze select soil samples for constituents <br /> listed in Section 4.2 of the SVE/OZ work plan. AGE proposes to install 30-inch microporous <br /> sparge points at depths of approximately 27 feet bsg in each of the injection wells. Following <br /> the installation of the two injection wells and following the SVE pilot test, AGE proposes a 24- <br /> week (6 months) IOS pilot study. AGE states that initially the ozone injection rates, frequency, <br /> and duration will be based on the manufacturer's recommendations and adjusted based on <br /> site conditions during the pilot test. Following the completion of the IOS pilot test, include in <br /> the report of findings, an estimate of the total ozone mass expected to be required to <br /> effectively remediate the petroleum contaminants at this site, taking into consideration the <br /> anticipated radius of influence of injected ozone based on site lithology and depth of sparging <br /> points, and the loss of ozone to subsurface reactions unrelated to petroleum contamination <br /> ozonation. AGE proposes to collect groundwater samples monthly from MW-2 and MW-3 or <br /> MW-4 and analyze the samples for constituents listed in the bullets of Section 4.4 of the <br /> SVE/OZ work plan. AGE also proposes to monthly monitor groundwater from MW-1 through <br /> MW-4 for dissolved oxygen, oxygen reduction potential and depth to water. AGE proposes to <br /> submit a geochemical evaluation report of ozone injection following the first two weeks of IOS <br /> and a progress report regularly thereafter. <br /> The EHD approves the IOS pilot study, following concurrence from the CRWQCB to omit the <br /> ozone BST and in accordance with the CRWQCB General Order to submit a Notice of Intent <br /> (NOI) and monitoring report program (MRP) for the waste discharge requirement (WDR) <br /> permit. Please submit boring permit applications and application/inspection fees to the EHD <br /> following this. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(a),sjcehd.com if <br /> you have any questions concerning this letter. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Timothy J. Cuellar, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Reqion, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />