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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http//www atcassociates com <br /> CVV_J%TC <br /> m <br /> f ECEp 209 579 2221 <br /> ASSOCIATES I NC u l!L� V%xi,;09 579 2225 <br /> ti: 20IJ4 <br /> October 11, 2004 ENVIRONMENT HEALTH <br /> 54 62596 0001 <br /> PERMIT/SERVICES <br /> Mr Richard Stiffler <br /> City of Stockton <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Subject September 2004 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 September 2004 Self-Momtoring 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 A site plan and remediation system <br /> layout are shown on Figures 2 and 3, respectively <br /> SELF-MONITORING ACTIVITIES <br /> ATC personnel monitored the groundwater discharge system on September 27, 2004 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 September 27, 2004, ATC <br /> collected well-mixed and representative samples of the final treated groundwater The <br /> groundwater samples were analyzed for pH by EPA method 150 1, total petroleum hydrocarbons <br /> by EPA method 418 1, total petroleum hydrocarbons as gasoline (TPHg) by EPA method 801513, <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) utilizing EPA method 8021B, and methyl <br /> tertiary butyl ether (MTBE) utilizing EPA method 8260B <br /> s 162596Veportslwaterdischarge107_04 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />