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(VYATC A s s 0 C I A T E 5 I N C In accordance with the annual requirements of the GDP, the groundwater sample was also analyzed for total petroleum hydrocarbons by EPA method 418 1, total cadmium, total chromium, total copper, total lead, total nickel, and total zinc by EPA method 200 series, and total toxic organics by EPA method 624 and 625 SELF-MONITORING RESULTS From the date of its startup, December 20, 2002, through March 26, 2004, the groundwater treatment system had an average flowrate of 0 55 gallons per minute (gpm) and 794 gallons per day (gpd) and a total discharge of 267,580 gallons During the reporting period for March 2004, the groundwater treatment system had an average flowrate of 0 36 gpm and 516 gpd and a discharge of 7,862 gallons The LEL did not exceed 10% during the February 2004 monitoring period The final treated groundwater sample (Effluent) collected on March 26, 2004, contained no detectable concentrations of total petroleum hydrocarbons, TPHg, BTEX, MTBE, ETBE, TBA, TAME, D1PE, 1,2-DCA, or EDB The final treated groundwater sample (Effluent) collected on March 26, 2004 indicate that pH was within the required range and total cadmium, chromium, copper, lead, nickel, zinc, and total toxic organics were less than the discharge limit Results of • the monthly self-morutonng program are summarized in Table 1 and analytical data is attached ADDITIONAL ACTIVITIES On March 26, 2004, Mr Eric Cooper of Cooper Controls and Electrical Services calibrated the LEL meter and discharge water flow meter at the site A copy of the calibration report is attached If you require any additional information, please contact our office at (209) 579-2221 Respectfully submitted, ATC Associates Inc Drew Van AllenFA Oki h Senior Project Managerp, � moms i Jeanne Homsey, P E �- CA Registered Civil Engineer No 4741DIL cc Mr and Mrs RaymondFarmer • Mr Jeff Wong, SCJEHD s 1625961reportslwaterdisc]3arge103_04 doc 2 1 1