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Stantec <br /> No Further Action Request Report <br /> Chevron and ARCO Commingled Plume No. CP0034 <br /> April 10, 2012 <br /> On June 11, 2007, SECOR field staff observed WDC Exploration and Wells of Zamora, <br /> California (WDC) drill and install MW-10 to approximately 20 ft bgs. Petroleum hydrocarbons <br /> were not detected in any soil samples collected from MW-10. <br /> ARCO 2133 Facility <br /> Since discovery of the pipe leak in 1984, 21 groundwater monitoring wells (E-1 through E-12, <br /> BHD-1, BHD-2, PR-1, PR-2, and MW-1 through MW-5), 12 SVE wells (V-1 through V-12), and <br /> nine AS wells (S-1 through S-9) have been installed. <br /> On June 12, 2007, SECOR staff oversaw WDC perform the destruction of MW-4 in accordance <br /> with San Joaquin County Environmental Health Department (SJCEHD) requirements. <br /> Due to unsafe locations in roadway, Stantec supervised Cascade Drilling, LP (Cascade) destroy <br /> three groundwater monitoring wells (BHD-1, E-7 and E-8) between November 9th and <br /> November 11, 2009. Stantec supervised Ramsey Engineering (Ramsey) re-pave the former <br /> locations of the wells. <br /> 2.4.3. Remediation History <br /> Chevron 94275 Facility <br /> An AS system was activated in April 1997, and an SVE system was activated in September <br /> 1997. The AS system consisted of a 1.5-horsepower (hp) rotary vane compressor, alternately <br /> injecting air into nine wells (GM-1 through GM-9). The SVE system was comprised of ten SVE <br /> wells (VW-1 and GM-1 through GM-9), a five-hp positive-displacement blower, and 100-cubic ft <br /> per minute (cfm) catalytic oxidizer. The SVE system was deactivated due to high groundwater <br /> levels in February 1998. Upon shutdown of the SVE system, the system extracted <br /> approximately 70 pounds (lbs) of GRO from the soil and groundwater beneath the site <br /> (SECOR, 1998). The AS system was shutdown in March 2005. The SVE and AS wells were <br /> destroyed and the remediation equipment was removed from the site in May 2005 (SECOR, <br /> 2005). Historical remediation system data for the SVE and AS systems are included in <br /> Appendix D. <br /> ARCO 2133 Facility <br /> A groundwater extraction (GWE) system was operated intermittently at the site from 1984 to <br /> 1996. A total of 3,980 lbs of GRO was removed and approximately 32,000,000 gallons of <br /> groundwater was extracted by the GWE system during active operation (SECOR 2005). <br /> Z.. <br /> 94275 NFAR 2012.doc 8 <br />