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• • Chevron Products Company page 3 Former Chevron service Station #9-5775, 301 West Kettleman Lane, Lodi, California October 31, 2002 Between June 25 and September 24, 2002, the GWE system discharged a total of 1,276,651 gallons of treated groundwater over a period of 92 days (Table 4). As of September 24, 2002, the GWE system has treated a total of 4,329,691 gallons. Calculated discharge rates during the 3Q02 monitoring period ranged from 6.33 to 9.78 gallons per minute (gpm). During the 3Q02 the system extracted an estimated 0.3 pounds of TPHg and 0.5 pounds of MtBE. To date, the system has extracted approximately 8.1 pounds of TPHg, 0.2 pounds of benzene, and 84.3 pounds of MtBE. Plots of GWE system mass removal trends and influent groundwater TPHg, benzene, and MtBE concentrations versus time are shown on Figures 6 and 7, respectively. 3.2 Soil Vapor Extraction System The Soil Vapor Extraction (SVE) system is comprised of four vapor wells (VE -1 through VE -4), connected by mechanical piping to a 5 horsepower (hp) positive -displacement blower, and a catalytic oxidizer. Vapors from the soil are removed under vacuum from the blower and petroleum hydrocarbons in these vapors are destroyed by a catalytic oxidizer, prior to discharging the air stream to the atmosphere. The operation of the SVE system is permitted by the San Joaquin Valley Air Pollution Control District (SJVAPCD). To assess effectiveness of the SVE, process samples were collected once per month from the vapor stream before (INFL) and after (EFFL) the catalytic oxidizer. Each sample was analyzed for TPHg, BTEX, and MtBE. Maximum concentrations of detected constituents are presented below. IAChevron1957751Periodic Monitoring\Quarterly Progress Reports1200213rd Quarter -2002 Progress Report.doc Maximum Constituent Concentration (go) Sampling Port July 2 through September 24, 2002 MtBE TBA EtBE TAME Ethanol Methanol INFL 71 <13 4.7 <2.0 <500 <400 MID -1 <2.5 <11 <2.0 <2.0 <100 <400 MID -2 <2.0 <12 <2.0 <2.0 <100 <400 EFFL <2.0 <10 <2.0 <2.0 <100 <400 Expt_anations: < Indicates the constituent was not present at or above the method reporting limit shown Between June 25 and September 24, 2002, the GWE system discharged a total of 1,276,651 gallons of treated groundwater over a period of 92 days (Table 4). As of September 24, 2002, the GWE system has treated a total of 4,329,691 gallons. Calculated discharge rates during the 3Q02 monitoring period ranged from 6.33 to 9.78 gallons per minute (gpm). During the 3Q02 the system extracted an estimated 0.3 pounds of TPHg and 0.5 pounds of MtBE. To date, the system has extracted approximately 8.1 pounds of TPHg, 0.2 pounds of benzene, and 84.3 pounds of MtBE. Plots of GWE system mass removal trends and influent groundwater TPHg, benzene, and MtBE concentrations versus time are shown on Figures 6 and 7, respectively. 3.2 Soil Vapor Extraction System The Soil Vapor Extraction (SVE) system is comprised of four vapor wells (VE -1 through VE -4), connected by mechanical piping to a 5 horsepower (hp) positive -displacement blower, and a catalytic oxidizer. Vapors from the soil are removed under vacuum from the blower and petroleum hydrocarbons in these vapors are destroyed by a catalytic oxidizer, prior to discharging the air stream to the atmosphere. The operation of the SVE system is permitted by the San Joaquin Valley Air Pollution Control District (SJVAPCD). To assess effectiveness of the SVE, process samples were collected once per month from the vapor stream before (INFL) and after (EFFL) the catalytic oxidizer. Each sample was analyzed for TPHg, BTEX, and MtBE. Maximum concentrations of detected constituents are presented below. IAChevron1957751Periodic Monitoring\Quarterly Progress Reports1200213rd Quarter -2002 Progress Report.doc