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April 17, 2012 <br />Cardno ERI 2789C.L13 <br />James Barton <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive #200 <br />Rancho Cordova, California 95670 <br />SUBJECT AS/SVE System Start -Up Report <br />Former Mobil Service Station 99CAS <br />75 East Alpine Avenue, Stockton, California <br />Authority to Construct Permit No.: N-8251-1-0 <br />Mr. Barton: <br />Caverna <br />ER/ <br />Shaping the Future <br />Cardno ERI <br />License AIC10-611383 <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />USA <br />Phone 707 766 2000 <br />Toll-free 800 382 9105 <br />Fax 707 789 0414 <br />www.cardno.com <br />www.cardnoorl.com <br />At the request of ExxonMobil Environmental Services (EMES), on behalf of ExxonMobil Oil Corporation, Cardno <br />ERI installed an air sparge/soil vapor extraction system (AS/SVE) at the subject site. Cardno ERI prepared this <br />letter summarizing the results of the AS/SVE system startup. The AS/SVE system extracts soil vapor from up to <br />nine SVE wells (SVE1, SVE2, SVE4, SVE5, VEW1 through VEW4, and MW4). Soil vapor is treated through an <br />electric catalytic oxidizer prior to discharge into the atmosphere under San Joaquin Valley Air Pollution Control <br />District (SJVAPCD) Authority to Construct Permit No. N-8251-1-0 (permit). <br />The AS/SVE system consists of a 11.5 -horsepower regenerative blower capable of a maximum flow rate of <br />350 cubic feet per minute (cfm); nine SVE wells; an electric catalytic oxidizer; AS air compressor; and <br />associated conveyance piping, noise abatement equipment, control devices, and instrumentation. <br />On March 27, 2012, Cardno ERI started the SVE system for compliance testing as required by the SJVAPCD. <br />The system was operated on wells SVE1, SVE4, and SVE5 at a maximum flow rate of 118 standard cubic feet <br />per minute (scfm). Vapor monitoring readings were taken with a photo -ionization detector (PID) to confirm the <br />destruction efficiency of the catalytic oxidizer. Cardno ERI collected influent and effluent air samples for <br />laboratory analysis and submitted the samples to a California state -certified laboratory, under Chain -of -Custody <br />protocol. The SVE system was shut down pending laboratory results. Operation of the AS system will be <br />initiated after influent hydrocarbon concentration levels have been reduced to maintain influent hydrocarbon <br />concentrations levels at the operating range for the catalytic oxidizer during combined AS/SVE operation. <br />The laboratory analytical report and Chain -of -Custody record are provided in Appendix A. Hydrocarbon removal <br />and emissions for the SVE system are presented in Table 1. Hydrocarbon extraction rates are calculated in <br />accordance with Cardno ERI's Standard Operating Procedure -25: "Hydrocarbons Removed from a Vadose <br />Well" (Appendix B). Upon receipt of sample results demonstrating permit compliance (greater than 95% <br />destruction efficiency); the SVE system was restarted for continuous operation on April 9, 2012. Quarterly <br />remedial status reports will be submitted within 30 days following the calendar quarter. <br />Australia - Belgium - Indonesia • Kenya - New Zealand • Papua New Guinea <br />United Arab Emirates - United Kingdom - United States - Operations in 60 countries <br />