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A S S Q C I A T E 5 I N C <br /> January 12, 2004 ° <br /> 54 62596 0001 <br /> JAN 14 2004 <br /> Mr Richard Stiffler ENVIRONMENT HEALTH <br /> City of Stockton PERMIT/SERVICES <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Subject December 2003 Self-Momtormg 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 December 2003 Self-Monitormg Report for the discharge <br /> system located at 610 North Hunter Street in Stockton, Califorrua (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 December 30, 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 December 30, 2003, ATC collected <br /> 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 /> s162596Ireportslwaterdischarge112_03 doe 1 <br />