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N'V'ATC 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> . 6 C I A T E S I H C Fax 209 579 2225 <br /> A 5 S <br /> February 13, 2003 <br /> 54 62596 0001P14 <br /> Mr Richard Stnffler <br /> City of Stockton <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Subject January 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 the January 2003 Self-Monitoring 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 <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 <br /> SELF-MONITORING ACTIVITIES <br /> ATC personnel monitored the groundwater discharge system on January 3, January 10, January <br /> 17, January 24, and January 28, 2003 In accordance with the City of Stockton Department of <br /> Municipal Utilities GDP requirements, the flow, total flow, and Lower Explosive Limits (LEL <br /> for gasoline) were continuously recorded Also in accordance with the GDP, on January 10, <br /> 2003, ATC collected grab, well mixed, and representative samples of the final treated <br /> groundwater The groundwater samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) by EPA method 8015, benzene, toluene, ethyl benzene, and xylenes (BTEX), <br /> and methyl tertiary butyl ether(MTBE) utilizing EPA method 8020 <br /> ATC inadvertently did not analyze the final treated groundwater for pH by EPA method 150 1, <br /> total petroleum. Hydrocarbons by EPA method 418 1, total cadmium, total chromium, total <br /> copper, total lead, total nickel, and total zinc by EPA method 200 series, or total toxic organics <br /> wIwordpro%625961reportslwaterdlsahargel01_03 doe 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />