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• <br />• <br />Chcvion PMCIULts Company <br />Former Chevron S6rVtee Station #9 5775 301 West Kettleman Lane Lodi California <br />Maximum Constituent Concentration (µg/1) <br />Sampling June 27, 2001 #hrou h September 26, 2001 <br />Location <br />TPHg <br />MtBE <br />TBA <br />EtBE <br />TAME <br />Ethanol <br />900 <br />32 <br />44 <br />10 <br />36 <br />INFL7<50 <br />MID -1 <br />40 <br /><5 0 <br /><0 50 <br /><0 50 <br />66 <br />MID -2 <br /><50 <br /><0 50 <br /><5 0 <br /><0 50 <br /><0 50 <br />72 <br />EFFL <br /><50 <br /><0 50 <br /><5 0 <br /><0 50 <br /><0 50 <br />11 <br />Explanation <br />Ug/l= micrograms per liter <br />< Indicates the constituent was not m resent at or above the method re ortlimit shown <br />Page 2 <br />October 12 2001 <br />Table I provides a complete summary of analytical results for the GWE since July of 2000 <br />System effectiveness can be gauged by review of Table 2 that provides tabulated operational <br />measurements and calculated mass removal rates for constituents based on reported <br />laboratory results <br />During the 3rd Quarter 2001, the GWE system treated approximately 1,138,733 gallons <br />groundwater The GWE system has treated approximately 3,348,672 gallons since operation <br />began Calculated discharge rates during the 3rd Quarter ranged from 5 34 to 6 73 gallons per <br />minute (gpm) <br />Dunng the 3rd Quarter the GWE system removed approximately 0 48 pounds of TPHg, 0 004 <br />pounds of benzene, and 4 59 pounds of MtBE from groundwater Since July 2000, the <br />system has removed approximately 7 20 pounds of TPHg, 0 151 pounds of benzene, and <br />80 90 pounds of MtBE Mass removal trends and influent groundwater TPHg, benzene, and <br />MtBE concentrations versus time are shown on Figures 3 and 4, respectively Certified <br />analytical reports with chain -of -custody records, and operation and maintenance field data <br />sheets for the 3rd Quarter 2001 are included in Attachments A and B, respectively <br />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 sir stream to the atmosphere The discharge is permitted by the San Joaquin <br />Valley Air Pollution Control District <br />I 1Chevron19577510&M13rdQuarter 2001130&MROI review doc <br />