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CAMBRIA
<br /> SYSTEM DESCRIPTION
<br /> The GWE system currently consists of one pneumatic submersible pump installed in well RW-1A,
<br /> a transfer tank, transfer pump, flow totalizer meter, filter vessel, and three 1,200-1b aqueous-phase,
<br /> granular activated carbon(GAC)vessels Groundwater is pumped from the well into the transfer tank
<br /> When the tank is full,level switches activate the transfer pump, which pumps water through the filter
<br /> vessels The three carbon vessels are connected in series A flow totalizer located downstream of the
<br /> carbon vessels records the volume of water being discharged into the City of Stockton sewer system
<br /> The discharge is authorized under a City of Stockton wastewater discharge penzut,originally issued
<br /> on October 23, 2000 and revised on June 28, 2002
<br /> SYSTEM OPERATION
<br /> The GWE system was started on May 31,2001 for the purpose of collecting start-up(grab)samples
<br /> The system was shutdown after sample collection All penrut-specified pollutants were reported
<br /> below the discharge limits Start-up sample analytical results were submitted to the City of Stockton
<br /> on June 18, 2001
<br /> • Continuous operation of the GWE system began on June 20,2001 For the current reporting period,
<br /> a (grab)sample was collected from the effluent of the third carbon vessel,prior to discharge into the
<br /> sanitary sewer The sample was analyzed for TPHg, benzene, toluene, ethylbenzene, and xylenes
<br /> (BTEX), and MTBE by EPA Method 8260B As per the new sampling requirements, the GWE
<br /> system effluent was also analyzed for total petroleum hydrocarbons (TPH)by EPA Method 1664 and
<br /> pH by EPA Method 150 1 Annual trace metal analysis(Cadmium,Chromium,Copper,Lead,Nickel
<br /> and Zinc)and Total Toxic Organics analysis is scheduled for May of 2003 For the purpose of system
<br /> performance monitoring, Cambria collected additional samples(not required by the permit)from the
<br /> influent of the first, second, and third carbon vessels and the effluent of the third carbon vessel on
<br /> June 19 and June 26, 2002 Analytical results for the GWE system samples are summarized in
<br /> Table 1 and presented in Appendix A
<br /> As of August 27,2002, the GWE system has extracted and treated an estimated 903,388 gallons of
<br /> groundwater, removing approximately 409, 58 1, and 568 lbs of TPHg, benzene, and MTBE,
<br /> respectively Extraction totals are summarized in Table 2
<br /> Spent carbon from the GAC vessels has been replaced with virgin coconut carbon four times since the
<br /> GWE system began operating The carbon from all three GAC vessels was replaced on
<br /> November 11, 2001,February 12, 2002, April 17, 2002 and July 17, 2002 On February 12, 2002,
<br /> one of the GAC vessels itself, which had a leak in it, was also replaced
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