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vATC, <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> A� Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> March 14, 2003 PZZN <br /> 54 62596 0001 rimlo <br /> #M;0 IL It <br /> Mr Richard Stiffler <br /> City of Stockton <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Subject February 2003 Self-Monitoring Report for Groundwater Discharge at Farmer <br /> Property, 610 North Hunter Street, Stockton, California <br /> Dear Mr Stiffler <br /> ATC Associates Inc is presenting this February 2003 Self Momtonng Report for the discharge <br /> system located at 610 North Hunter Street in Stockton, California (Figure 1) The Groundwater <br /> Discharge Permit (GDP) was approved by the City of Stockton Department of Municipal <br /> Utilities on November 6, 2002 On February 19, 2003, the City of Stockton Department of <br /> Municipal Utilities issued an Amended Groundwater Discharge Permit increasing the maximum <br /> groundwater discharge capacity from 1,000 to 2,000 gallons per day <br /> REMEDIATION SYSTEM DESCRIPTION <br /> On December 20, 2002, ATC personnel started up the soil and groundwater remediation system <br /> at the above referenced property The remediation system includes a thermal oxidizer to <br /> remediate petroleum-impacted vapors and a carbon filtration system to remediate petroleum- <br /> impacted groundwater extracted from the subsurface Groundwater is collected into a knockout <br /> drum, treated, and then discharged to the sanitary sewer <br /> SELF-MONITORING ACTIVITIES <br /> ATC personnel monitored the groundwater discharge system on February 28, 2003 In <br /> accordance with the City of Stockton Department of Municipal Utilities Amended GDP <br /> requirements, the flow, total flow, and Lower Explosive Limits (LEL for gasoline) were <br /> continuously recorded Also in accordance with the GDP, on February 28, 2003, ATC collected <br /> grab, well mixed, and representative samples of the final treated groundwater The groundwater <br /> samples were analyzed for pH by EPA method 150 1, total petroleum hydrocarbons by EPA <br /> method 418 1, total petroleum hydrocarbons as gasoline (TPHg) by EPA method 8015, benzene, <br /> • toluene, ethyl benzene, and xylenes (BTEX) utilizing EPA method 8020, and methyl tertiary <br /> butyl ether (MTBE) utilizing EPA method 8260 <br /> w Iwordprol625961reportslwaterd)scharge102_03 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />