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S ECOR <br /> • 5.0 STATUS OF REMEDIATION ACTIVITIES <br /> 5.1 DPE System <br /> The DPE system is comprised of wells DPE-1 through DPE-13, MW-40 and 2AMW-14, a <br /> 100-gallon liquid/vapor separator, and a Solleco 400- standard cubic feet per minute (scfm) <br /> thermal oxidizer with a Travani 25-hp liquid ring pump. <br /> From March 18, 2004 through April 4, 2004 the system was operated to conduct source tests for <br /> 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 /> Through groundwater extraction (GWE), a total of approximately 2,717,910 gallons of water <br /> have been treated since system start-up. The DPE system (GWE and SVE combined) has <br /> removed approximately 6,658 pounds (1,091 gallons) of TPHg, 5,313 pounds (740 gallons) of <br /> TPHd, 2,778 pounds (365 gallons) of TPHo, 5.16 pounds (0.70 gallons) of benzene, 0.01 <br /> • pounds (0.00 gallons) of MtBE, and 0.31 pounds (0.05 gallons) of TBA from water and soil <br /> vapor to date. For 1Q08, the DPE system has removed approximately 58.5 pounds (9.6 <br /> gallons) of TPHg, 386.7 pounds (53.9 gallons) of TPHd, 214.1 pounds (28.1 gallons) of TPHo, <br /> 0.00 pounds (0.00 gallons) of benzene, 0.00 pounds (0.00 gallons) of MtBE, and 0.08 pounds <br /> (0.01 gallons) of TBA. Additionally, the DPE system, NET free product removal system, and <br /> periodic extraction from monitoring wells have removed approximately 1,651 gallons of SPH <br /> from groundwater beneath the site. <br /> Historical DPE system operations and analytical data are presented in Tables 10 through 16. <br /> Illustrations of historical chemical concentrations and mass removal versus time are shown on <br /> Figures 18 through 21. <br /> In addition to the remediation system onsite, SPH removal activities are conducted to remove <br /> measurable SPH from wells on and off site. SPH removal activities are scheduled to be <br /> conducted quarterly (at a minimum) for wells that repeatedly contain measurable thickness of <br /> SPH. SPH Removal was conducted on January 17, 2008 (Tables 17 and 18). Field data <br /> sheets and waste manifests for SPH removal are presented in Appendix E. <br /> 5.2 Apartment SVE System <br /> The Apartment SVE (ASVE) system has operated near continuously since May 31, 2007 <br /> following retrofit construction that began on December 12, 2006. The ASVE system is <br /> comprised of horizontal wells: ASVE-1 through ASVE-6, a 100-gallon liquid/vapor separator, <br /> and a Solleco 250 cubic feet per minute (cfm) vapor extraction system with a Roots URAI 56 10- <br /> hp positive displacement blower. Vapor from both the ASVE and the SVE (discussed in section <br /> 5.3) system is abated with a 750 scfm thermal oxidizer. <br /> 1 Q08QSSRQRSRQMR.Final.doc 27 April 30,2008 <br /> 77rW.26397.42.1307 <br />