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Chevron Products Company Page 3 <br /> Former Chevron Service Station#9-5775,301 West Kettleman Lane LAA,California July 15,2002 <br /> Maximum Constituent Concentration <br /> (}ig/1) <br /> Sampling Port March 29 through June 25,2002 <br /> MtBE TBA ELBE TAME Ethanol Methanol <br /> INFL 91 <5 0 70 10 61 <100 <br /> MID-1 <0 50 <5 0 <0 50 <0 50 <5 0 50 <br /> MID-2 <0 50 <5 0 <0 50 <0 50 <5 0 <50 <br /> EFFL <0 50 <5 0 <0 50 <0 50 <5 0 <50 <br /> Explanations <br /> <Indicates the constituent was not present at or above the method reporting limit shown <br /> Between March 29 and June 25, 2002, the GWE system discharged a total of 1,206,005 <br /> gallons of treated groundwater over a period of 88 days (Table 4) As of.lune 25, 2002, the <br /> GWE system has treated a total of 3,161,828 gallons Calculated discharge rates during the <br /> 2Q02 monitoring period ranged from 6 59 to 10 45 gallons per minute (gpm) <br /> During the 2Q02 the system extracted an estimated 0 3 pounds of TPHg, 0 003 pounds of <br /> benzene, and 12 pounds of MtBE To date, the system has extracted approximately 7 8 <br /> pounds of TPHg, 0 2 pounds of benzene, and 83 8 pounds of MtBE Plots of GWE system <br /> mass removal trends and influent groundwater TPHg, benzene, and MtBE concentrations <br /> versus time are shown on Figures 6 and 7, respectively <br /> 3.2 Soil Vapor Extraction System <br /> The Soil Vapor Extraction (SVE) system is comprised of four vapor wells (VE-1 through <br /> VE-4), connected by mechanical piping to a 5 horsepower(hp)positive-displacement blower, <br /> and a catalytic oxidizer Vapors from the soil are removed under vacuum from the blower <br /> and petroleum hydrocarbons in these vapors are destroyed by a catalytic oxidizer, prior to <br /> discharging the air stream to the atmosphere The operation of the SVE system is permitted <br /> by the San Joaquin Valley Air Pollution Control District(SJVAPCD) <br /> To assess effectiveness of the SVE, process samples were collected once per month from the <br /> vapor stream before (INFL) and after (EFFL) the catalytic oxidizer Each sample was <br /> analyzed for TPHg, BTEX, and MtBE Maximum concentrations of detected constituents are <br /> presented below <br /> 11Chevron1957751Penodre Monitortng\Quarterly Progress Reports1200212nd Quarter-2002 Progress Report doc <br />