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C. VATC A S S O C I A T E S I N C <br /> SELF-MONITORING RESULTS <br /> From the date of its startup, December 20, 2002, through August 29, 2003, the groundwater <br /> treatment system had an average flowrate of 0 65 gallons per minute (gpm) and 941 gallons per <br /> day (gpd) and a total discharge of 185,625 gallons During the reporting period for August 2003, <br /> the groundwater treatment system had an average flowrate of 0 48 gpm and 687 gpd and a <br /> discharge of 21,455 gallons The LEL did not exceed 10% during the August 2003 monitoring <br /> period <br /> Final treated groundwater samples (Effluent) collected on August 29, 2003, contained no <br /> detectable concentrations of total petroleum hydrocarbons, TPHg, BTEX, MTBE, ETBE, TBA, <br /> TAME, DIPS, 1,2-DCA, or EDB Final treated groundwater samples (Effluent) collected on <br /> August 29, 2003 indicate that pH was within the required range Results of the monthly self- <br /> monitoring program are summarized in Table 1 and analytical data is attached <br /> ADDITIONAL ACTIVITIES <br /> On August 21, 2003, Mr Eric Cooper of Cooper Controls and Electrical Services re-calibrated <br /> the LEL meter at the site The LEL had inadvertently been calibrated by ATC personnel that <br /> were not certified to calibrate the LEL meter A copy of the calibration report is attached <br /> If you require any additional information, please contact our office at (209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> b , �L <br /> Drew Van Allen <br /> Senior Project Manager <br /> J &eHomsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> cc Mr and Mrs Raymond Farmer <br /> Mr Jeff Wong, SCJEHD <br /> s 1625961reponslwaterdischarge108_03 doe 2 <br />