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Stantec <br /> L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, <br /> REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT <br /> February 1, 2013 <br /> 3.0 Status of Remediation Activities <br /> 3.1 DUAL PHASE EXTRACTION SYSTEM <br /> 3.1.1 Dual Phase Extraction Systems Summary <br /> The dual phase extraction (DPE) system consists of groundwater extraction (GWE) and soil <br /> vapor extraction (SVE) and utilizes wells DPE-1 through DPE-13, and 2AMW-14, a 100-gallon <br /> liquid/vapor separator, and a Solleco 400- standard cubic feet per minute (scfm) thermal <br /> oxidizer with a Travaini TRO 400s 25-hp liquid ring pump. <br /> From March 18, 2004 through April 4, 2004, the system was operated to conduct source tests <br /> for the San Joaquin Valley Air Pollution Control District (SJVAPCD) and the collection of effluent <br /> Polycyclic Aromatic Hydrocarbon (PAH) sampling under Authority to Construct (ATC) number <br /> N-4878-1-1. On July 7, 2004, the SJVAPCD issued a new ATC number (N-4878-1-2) for <br /> permanent operation of the system. The system was re-started on August 2 and 3, 2004 for <br /> collection of PAH samples. Following PAH sample collection; the system was shut down until <br /> Site excavation activities were completed. Continuous operation of the DPE system was <br /> re-commenced on December 14, 2004. On June 22, 2005, SJVAPCD issued a Permit to <br /> Operate (PTO) number (N-4878). On September 8, 2006, SJVAPCD issued a PTO number <br /> (N-4878-1-3)that excluded further sampling of PAH. <br /> 3.1.2 Dual Phase Extraction System Operational and Analytical Data—4Q12 <br /> Operation of the DPE system is conducted periodically to capture product that seeps into the <br /> DPE wells. The DPE system was non-operational during the months of October and November <br /> while a replacement Honeywell chart recorder was being built by the manufacturer. The chart <br /> recorder was received in late November and installed December 7, 2012. After installation the <br /> DPE system was restarted. The system was found down on arrival on December 21, 2012 due <br /> to a high level alarm and restarted without incident. The system will be left operational during <br /> 1 Q13 based on field conditions. <br /> During 4Q12, the DPE system processed approximately 30,908 gallons of water originating <br /> from system operation, rainwater, knock-out water, and purge water that was collected during <br /> site monitoring and sampling. During this period the system (GWE and SVE combined) <br /> removed approximately 1.28 lbs. (0.21 gallons) of TPHg, 1.44 lbs. (0.20 gallons) of TPHd, 0.77 <br /> lbs. (0.10 gallons) of TPHo. No appreciable amount of benzene, MtBE, or TBA was recovered <br /> during 4Q12. <br /> Historically the DPE system (GWE and SVE combined) has removed approximately 18,040 lbs. <br /> (2,957 gallons) of TPHg, 9,559 lbs. (1,331 gallons) of TPHd, 5,142 lbs. (675 gallons) of TPHo, <br /> 12.09 lbs. (1.63 gallons) of benzene, 3.54 lbs. (0.57 gallons) of MtBE, and 0.53 lbs. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 3.1 <br />