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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 /> 6.0 Annual Summary of Remediation - 2012 <br /> 6.1 DPE SYSTEM OPERATIONAL AND ANALYTICAL SUMMARY- 2012 <br /> 6.1.1 DPE System 2012 Operational Summary <br /> During 2013 (December 15, 2011 through December 21, 2012), the DPE system (GWE and <br /> SVE combined) was 9.9% operational (36.6 out of 372 days). The system was shut down with <br /> the approval of the RWQCB-CVR on October 13, 2011. Due to low mass removal rates, the <br /> system remained non-operational to monitor the response in wells DPE-1 through DPE-13. On <br /> May 3, 2012 the system was rebound tested; during the test product or sheen was observed in <br /> seven of the DPE wells with a maximum of 0.76 feet observed in well 2AMW-14. To treat the <br /> sheen and product, Stantec started the system on May 8, 2012 and left it operational for the rest <br /> of the month. The system was intentionally left off during the months of June and July. A <br /> carbon change-out event was conducted on August 10, 2012. On August 15, 2012, during <br /> system startup, it was determined that the discharge water meter was broken. The system was <br /> left off until August 22, 2012 when the meter was replaced and the system restarted. The <br /> system was found down on arrival on August 31, 2012 due to a faulty high LEL alarm and left <br /> nonoperational until the LEL sensor could be addressed. On September 5, 2012 the LEL <br /> sensor was fixed. Prior to startup a final system inspection revealed that the system's chart <br /> recorder needed replacement. An identical made to order Honeywell chart recorder was <br /> identified and purchased. The replacement chart recorder was received in late November and <br /> installed on December 7, 2012. After installation the DPE system was restarted. The system <br /> was found down on arrival on December 21, 2012 due to a high level alarm and restarted <br /> without incident. The system will be left operational during 1013 based on field conditions. <br /> I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 6.1 <br />