ARCHIVED REPORTS XR0003545 - Laserfiche WebLink

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CAMBRIA SYSTEM DESCRIPTION The GWE system currently consists of one pneumatic submersible pump installed in well RW-1A, a transfer tank, transfer pump, flow totalizer meter, filter vessel,and three 1,200-1b aqueous-phase, activated-carbon vessels Groundwater is pumped from the well into the transfer tank When the tank is full, level switches activate the transfer pump, which pumps water through the filter vessels The three carbon vessels are connected in series A flow totalizer located downstream of the carbon vessels records the volume of water being discharged into the City of Stockton sewer system The discharge is authorized under a City of Stockton wastewater discharge permit, issued on October 23, 2000 SYSTEM OPERATION The GWE system was started on May 31,2001 for the purpose of collecting start-up(grab) samples The system was shutdown after sample collection All permit-specified pollutants were reported below the discharge limits Start-up sample analytical results were submitted to the:City of Stockton on June 18, 2001 Continuous operation of the GWE system began on June 20, 2001 Twice-monthly(grab) samples were collected from the influent of the first, second,and third carbon vessels and the effluent of the third carbon vessel, prior to discharge into the sanitary sewer The samples were analyzed for total petroleum hydrocarbons as gasoline(TPHg)by EPA Method 8015M or 8260B,and benzene,toluene, ethylbenzene,and xylenes(BTEX)and MTBE by EPA Method 8021B or 8260B Semi-annual trace metal analysis (Cadmium, Chromium, Copper, Lead, Nickel and Zinc) was performed on system effluent samples from October 16,2001 All permit-specified trace metals were analyzed by EPA 200 Series Method,and were reported below the discharge limits Analytical results for the GWE system sampling are summarized in Table 1 and presented in Appendix A As of December 12, 2001, the GWE system has extracted and treated an estimated 109,720 gallons of groundwater, removing approximately 42 3, 8 94, and 918 lbs of TPHg, benzene, and MTBE, respectively Extraction totals are summarized in Table 2 ANTICIPATED FUTURE ACTIVITIES Cambria will continue routine site visits to perform operation and maintenance activities and collect samples from the GWE system Cambria will also prepare the first semi-annual 2002 self-monitoring report