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r • • <br /> ENVIRONMENTAL AUDIT, INC. o <br /> 1000-A Ortega Way, Placentia, CA 92870-7162 <br /> 714/632-8521 FAX: 714/632-6754 <br /> email:bstolin@environmentalauditine.com <br /> MEMORANDUM <br /> DATE: September 17, 2001 EAI PROJECT 1 NO.. 1232 <br /> C__ <br /> TO: Marty Hartzel <br /> RWQCB—Central Valley Region 9 <br /> 3443 Routier Road, Suite A n' <br /> Sacramento, CA 95827-3003 o <br /> CC: See Distribution List <br /> T <br /> � J <br /> FROM: Boris StolinV <br /> SUBJECT: STATUS REPORT#2—REMEDIAL SYSTEM, WARDS STOCKTON <br /> CAO NO. 5-00-707 <br /> As outlined in our previous memo dated July 19, 2001, Environmental Audit, Inc. (EAI) <br /> performed field measurements and ground water and soil vapor sampling associated with the <br /> above-referenced matter on August 27, 2001. From July 19, 2001, to August 24, 2001, the <br /> remediation system was operated in the biosparging cycling mode, i.e. only the air sparging <br /> compressor was running using a three day online and four day offline cycle. The system was <br /> shut down on August 24, 2001, prior to completing the field activities described below on <br /> August 27, 2001: <br /> • Gauging monitoring wells MW-2, MW-3, and MW-4. <br /> • Obtaining non-purge ground water samples from wells MW-2, MW-3, and MW-4. <br /> • Starting the air sparging compressor and taking readings from vapor extraction wells <br /> when the compressor was running. <br /> • Starting the thermal oxidizer and taking a soil vapor and combustion gases samples. <br /> Depth to Ground Water <br /> The depth to ground water in wells MW-2, MW-3 and MW-4 was 34.67 feet below ground <br /> surface (bgs), 34.05 feet bgs, and 34.50 bgs, respectively, which was approximately three feet <br /> lower than the measurements taken on May 30, 2001 (see Table 1). <br /> Ground Water Sampling <br /> Non-purge ground water samples were obtained from wells MW-2, MW-3 and MW-4 using a <br /> point source bailer dropped to a depth of 50 feet bgs. The samples were analyzed for total <br /> petroleum hydrocarbons as gasoline (TPH) by modified EPA Method 8015, and benzene, <br />