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C\T-ATCw <br /> ASSO CIATES INC <br /> SELF-MONITORING RESULTS <br /> From the date of its startup, December 20, 2002, through April 18, 2003, the groundwater <br /> treatment system had an average flowrate of 0 84 gallons per minute (gpm) and 1,211 gallons per <br /> day (gpd) and a total discharge of 107,667 gallons During the reporting period for April 2003, <br /> the groundwater treatment system had an average flowrate of 0 43 gpm and 619 gpd and a total <br /> discharge of 6,525 gallons The LEL did not exceed 10% during the April 2003 monitoring <br /> period The treatment system was not operational for a period of approximately two weeks due <br /> to mechanical difficulties with the thermal oxidizer unit <br /> Final treated groundwater samples (Effluent) collected on April 18, 2003, contained no <br /> detectable concentrations of total petroleum hydrocarbons, TPHg, BTEX, MTBE, ETBE, TBA, <br /> TAME, DIPE, 1,2-DCA, or EDB Final treated groundwater samples (Effluent) collected on <br /> April 18, 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 April 11, 2003, Mr Eric Cooper of Cooper Controls and Electrical Services calibrated the <br /> LEL meter at the site A copy of the calibration report is attached ATC will schedule the <br /> calibration of the flow meter in May 2003 <br /> If you require any additional information,please contact our office at (209) 579-2221 <br /> Respectfiilly submitted, <br /> ATC Assoc' <br /> s Inc <br /> nAc /{ <br /> xk <br /> Drew Van Allen <br /> Senior Project Manager i�Y <br /> 4it aro <br /> Je e Homsey, P E � -z off " <br /> CA Registered Civil Engineer No 47410 ; � <br /> cc Mr and Mrs Raymond Farmer <br /> w Iwordprol625961rcportslwaterdischarge104_03 doc 2 <br />