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N <br /> ATC Associates Inc. <br /> (:V <br /> �� 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> A S 5 0 C T A T E 5 I N C . <br /> fax: 209-579-2225 <br /> continuously recorded. Also in accordance with the GDP, on June 29, 2005, ATC collected well- <br /> mixed and representative samples of the final treated groundwater. The groundwater samples <br /> were analyzed for pH by EPA method 150. 1 ; total petroleum hydrocarbons by EPA method <br /> 418 . 1 ; total petroleum hydrocarbons as gasoline (TPHg) by EPA method 8015B; benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX) utilizing EPA method 802113; and methyl tertiary <br /> butyl ether (MTBE) utilizing EPA method 8260B . <br /> SELF-MONITORING RESULTS <br /> From the date of its startup, December 20, 2002, through June 29, 2005 , the groundwater <br /> treatment system had an average flowrate of 0.91 gallons per minute (gpm) and 1 ,310 gpd and a <br /> total discharge of 425 ,685 gallons. During the reporting period from May 31 to June 29, 2005, <br /> the groundwater treatment system had an average flowrate of 0 .61 gpm and 880 gpd and a <br /> discharge of 1 , 141 gallons. The system was shut down from May 31 to June 28, 2005 in order to <br /> troubleshoot the reason for exceeding the discharge limits during the last reporting period. <br /> Subsequently, one extraction well was closed and the vacuum on another extraction well was <br /> reduced. Upon restart, the system was monitored daily to ensure that we were in compliance. <br /> The final treated groundwater sample (Effluent) collected on June 29, 2005 , contained no <br /> detectable concentrations of total petroleum hydrocarbons, TPHg, BTEX, MTBE, ETBE, TBA, <br /> TAME, DIPE, 1 .2-DCA, or EDB. The final treated groundwater sample (Effluent) collected on <br /> June 29; 2005 indicated 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 /> If you require any additional information, please contact our office at (209) 579-2221 . <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> 1z'AHyEE <br /> h HOM° <br /> N ON 7-417 <br /> CIVIL <br /> Jeanne Homsev, P.E. <br /> CA Registered Civil Engineer No . 47410 <br /> cc: Mr. and Mrs . Raymond Farmer <br /> s:\62596\reports\waterdischarge\06_05.doc 2 <br />