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Chcvrun NodUCtJ Cor1ipany Fags. 2 <br />' Foi pwr Chevron Service Station #9-5775, 301 West Ketticman Lane, Lodi, California October 12, 2001 <br />• <br />Maximum Constituent Concentration (µg/l) <br />' Sampling September 5 through September 26, 2001 <br />Part <br />TPHg MtBE TBA EtBE TAME Ethanol <br />1NFL 54 290 5.0 17 29 11.0 <br />' MID -1 <br /><50 <0.50 <5.0 <0.50 <0.50 <5.0 <br />MID -2 <br /><50 <0.50 <5.0 <0.50 <0.50 <5.0 <br />' E FFL <br /><50 <0.50 <5.0 <0.50 <0.50 <5.0 <br />Explanations <br />indicates the constituent was not present at or above the method reporting limit shown <br />Between August 29 and September 26, 2001, the GWE system discharged a total of 569,884 <br />' gallons of treated groundwater over a period of 28 days (Table 2). As of September 26, 2001, <br />the GWE system has treated a total of 3,348,672 gallons. Calculated discharge rates during <br />the September monitoring period ranged from 5.34 to 5.72 gallons per minute (gpm). <br />During the September monitoring period the system extracted approximately 0.0 13 pounds of <br />TPHg, 0.001 pounds of benzene, and 1.15 pounds of MtBE. To date, the system has <br />extracted approximately 7.18 pounds of TPHg, 0.151 pounds of benzene, and 80.72 pounds <br />of MtBE. Plots of GWE system mass removal trends and influent groundwater TPHg, <br />benzene, and MtBE concentrations versus time are shown on Figures 4 and 5, respectively. <br />' Certified analytical reports and chain -of -custody documentation and remedial system <br />operation and maintenance field data sheets are included in Attachments A and B, <br />' respectively. <br />DISCHARGE OF ETHANOL AND METHANOL <br />As discussed with Mike Schafer with the City of Lodi during April 2001, discharges of <br />methanol and ethanol to the industrial sewer system at concentrations similar to those found <br />in the remediation system's effluent stream do not constitute a significant threat to the local <br />treatment system. In accordance with this conversation, discharges of low concentrations of <br />methanol and ethanol are not considered violations of the discharge limitations. The <br />' presence of ethanol and methanol is thought to be attributed to the decay of plant material, <br />and is believed to be unrelated to the former Chevron service station. <br />SYSTEM MODIFICATIONS <br />There have been no system modifications during the September discharge period. <br />1AChevron19577510&M\Discharge Reportsl.5eptember-20011Discharge Report.doc <br />