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Stantec L & M OPERABLE UNIT- FOURTH QUARTER AND ANNUAL 2012 SITE STATUS, REMEDIAL SUMMARY, AND GROUNDWATER MONITORING REPORT Status of Remediation Activities February 1, 2013 (0.08 gallons) of TBA from water and soil vapor to date. Since system start-up groundwater extraction has removed and treated approximately 6,877,073 gallons of water. Historical DPE system operations and analytical data are presented in Tables 7 through 12. Chemical concentrations and mass removal graphs are presented on Figures 31 through 34. Analytical lab reports and field data sheets for all O&M activities are presented in Appendix I. 3.2 L&M OU AND APARTMENT SOIL VAPOR EXTRACTION SYSTEMS 3.2.1 L&M OU and Apartment Soil Vapor Extraction Systems Summary The L&M OU SVE (SVE) and Apartment SVE (ASVE) systems have been operational since May 31, 2007. The SVE system is comprised of horizontal vapor wells: SVE-1 through SVE-11, a 100-gallon liquid/vapor separator, and a Solleco 500 cfm vapor extraction system with a Roots URAI 59 20-hp positive displacement blower. The ASVE system is comprised of horizontal wells (ASVE-1 through ASVE-6), a 100-gallon liquid/vapor separator, and a Solleco 250 cubic feet per minute (cfm) vapor extraction system with a Roots URAI 56 10-hp positive displacement blower. Vapor from both the SVE and the ASVE systems is abated with a 750 scfm thermal oxidizer. Since May 31, 2007 the 750 scfm SVE and ASVE vapor abatement system has been operated under SJVAPCD permit number N-4878-2-0. 3.2.2 L&M OU and Apartment Soil Vapor Extraction Systems Operational Data—4Q12 During 4Q12 (September 21, 2012 to December 21, 2012) the SVE system was approximately 56% operational (51 out of 91 days ) and the ASVE system was approximately 47% operational (43 out of 91 days). On October 4, 2012 the ASVE system was found down on arrival as a possible result of transfer pump malfunction and restarted without incident. Both systems were shut down on October 15, 2012 to accommodate the site groundwater monitoring and sampling event and restarted on October 19, 2012 following the event. On November 9, 2012 the ASVE system blower overload was found tripped and the system found down on arrival. The spark arrestor was cleaned, blower oil changed and system restarted without error. On December 7, 2012 both systems were 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; as a result, samples for the month of December could not be obtained. The motor will be repaired, reinstalled, and the system restarted during January 2013. 3.2.3 Apartment Soil Vapor Extraction System Analytical Data —4Q12 During 4Q12 (September 21, 2012 to December 21, 2012) the ASVE system removed approximately 10.1 lbs. (1.7 gallons) of TPHg, 0.083 lbs. (0.011 gallons) of benzene, and 0.19 lbs. (0.03 gallons) of MtBE from the subsurface. To date the ASVE system has removed approximately 2,753.5 lbs. (451.4 gallons) of TPHg, 10.19 lbs. (1.42 gallons) of TPHd, 2.872lbs. (0.391 gallons) of benzene, and 6.07 lbs. (0.98 gallons) of MtBE from soil vapor I:\Tidewater\TW Stockton(P2A)\QMRs\2012\4Q12-Ann ual\4Q12 and Annual QSSR QRSR QMR Stockton_FINAL.doc 3.2