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Chevron Products Company 13
<br />Former Chevron Service Station #9-5775,301 West Kettleman Lane, Lodi, California June 5, 2001
<br />3 was initiated on July 3, September 22, and November 28, 2000, respectively Extracted
<br />groundwater is routed through a particulate filter, then three 2,000 -pound liquid phase activated
<br />carbon vessels plumbed in series as A, B, and C
<br />As of March 28, 2001 (1st quarter 2001), the GWE system had treated a total of 1,530,569 gallons
<br />The system has extracted an estimated 5 59 pounds of TPHg, 0136 pounds of benzene, and 66 11
<br />pounds of MtBE (Table Q-1, Attachment Q) Plots of GWE system mass removal trends and
<br />influent groundwater TPHg, benzene, and MtBE concentrations versus time are shown on Figures
<br />Q-1 and Q-2, respectively (Attachment Q).
<br />5 1 1 GWE System Radius of Influence
<br />Between November 13 and 27, 2000, SECOR conducted an aquifer test to estimate various aquifer
<br />parameters (SECOR, Aquifer Test Report, dated March 30, 2001) Results of the parameter
<br />analysis for the constant -rate pumping test are summarized in Table Q-2 (Attachment Q)
<br />Background data for all the wells showed that the influence of pumping from Well 12 was
<br />observed in wells MW -1, MW -5A, MW -8B, and EX -3 The drawdown effects observed from
<br />pumping at Well 12 were 10, 0 4, 0 3, and 0 1 feet in wells MW -8B, MW -5A, EX -3, and MW -1,
<br />respectively No influence from the municipal well pumping was observed in wells MW -5B,
<br />MW -8A, and MW-14/EX-2 Changes in barometric pressure were observed to Influence the water
<br />levels in the shallow screened wells (MW-14/EX-2, MW -1, and MW -SA) No such influence of
<br />the barometric pressure was observed on water levels in the deeper screened wells (MW -5B and
<br />MW-8B)
<br />As part of the aquifer test, SECOR also conducted a capture zone analysis to estimate the capture
<br />zone created from remediation efforts To evaluate capture zone, SECOR utilized the
<br />Environmental Protection Agency (EPA) WHPA modeling program module Multiple Well
<br />Capture Zone (MWCAP) MWCAP is designed to provide efficient delineation of capture zones
<br />for one or more pumping wells in homogeneous aquifers Assuming steady-state conditions,
<br />pumping from EX -3 at a constant rate of 8 5 gpm would create a capture zone that extends
<br />approximately 130 to 150 feet downgradient of EX -3 and have a cross-sectional width of
<br />approximately 400 feet The resulting capture zone is presented on Figure Q-3 within Attachment
<br />Q
<br />5.2 SVE System Operation
<br />The SVE system is comprised of four vertical SVE wells (VE -1 through VE -4), a 5 horsepower
<br />(hp) positive -displacement blower, and a Falco 100 catalytic oxidizer The SVE system is
<br />permitted by the San Joaquin Valley Air Pollution Control District (SJVAPCD) for operation
<br />through May 5, 2010 (Permit No N4343-1-0)
<br />11Chevron1957751ParFrpl9-5775PARFRP2 doc
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