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Stantec L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Annual Summary of Remediation-2012 February 1, 2013 6.2 ASVE SYSTEM OPERATIONAL AND ANALYTICAL SUMMARY- 2012 During 2012 (December 15, 2011 to December 21, 2012) the ASVE system was 53% operational (197.7 out of 372 days). The ASVE system is periodically shut down to accommodate quarterly site monitoring and sampling. The system experienced a period of downtime during the first quarter as a result of transfer pump malfunction. The transfer pump plumbing was replaced on February 27, 2012. The system spark arrestor was cleaned on March 28, 2012 and April 20, 2012. On June 22, 2012 the system was found down due to a high level alarm in the oil/water separator. The system was shut down on August 10, 2012 and restarted on August 22, 2012 to accommodate a carbon change out event for the DPE system. On September 21, 2012 and October 4, 2012 the system was found down on arrival as a possible result of transfer pump malfunction. On November 9, 2012 the ASVE system blower overload was found tripped and the system found down on arrival. On December 7, 2012 the system was found down on arrival. Upon attempted restart it was discovered that the combustion blower was malfunctioning. On December 21, 2012 the combustion blower motor was removed and brought to a motor shop for repair. The motor will be repaired, reinstalled, and the system restarted during January 2013. During 2012 ASVE the system removed approximately 15.8 lbs. of TPHg, 0.022 lbs. of benzene, and 0.050 lbs. of MtBE from soil vapor beneath the Delta View Apartments (below). Approximate Approximate Approximate Hour TPHg Benzene MtBE Meter Recovery Recovery Recovery Date Reading 2012 2012 2012 Sampled (hours) (lbs.) (lbs.) (lbs.) 12/15/2011 4,894 1/19/2012 5,733 6.2 0.05 0.12 2/28/2012 6,262 4.8 0.04 0.09 3/16/2012 6,672 4.3 0.04 0.08 4/6/2012 6,909 68.0 0.02 0.04 4/20/2012 6,910 0.3 0.02 0.04 5/8/2012 7,339 4.0 0.03 0.07 6/22/2012 7,564 2.1 0.02 0.04 7/12/2012 8,042 4.4 0.04 0.08 8/15/2012 8,255 1.9 0.02 0.03 9/21/2012 8,606 3.2 0.03 0.06 10/19/2012 8,902 3.2 0.03 0.06 11/28/2012 9,581 6.9 0.06 0.13 12/21/2012 9,638 Reporting Period: December 15,2011 to December 21,2012 Days in Period: 372 Days Operational in Period: 197.7 Period Pounds TPHg Removed: 109.3 Period Pounds Benzene Removed: 0.40 Period Pounds MtBE Removed: 0.84 I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 6.4