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1117 Lone Palm Avenue, Suite B <br />.�� CVYA%TC Modesto, CA 95351 <br /> http//www atcassoclates corn <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A !f S O C E A T E $ I N C <br /> November 15, 2004 <br /> 54 62596 0001 <br /> Dov ,� $ zoo4 <br /> EN� 1��AL1 M <br /> Mr Richard StifflerNpRi SERVICES <br /> City of Stockton <br /> Department of Municipal Utilities , <br /> 2500 Navy Drive \,r <br /> Stockton CA 95206-1191 'lf� <br /> Subject October 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 October 2004 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 On February 19, 2003, the City of Stockton Department of <br /> MMunicipal Utilities issued an Amended Groundwater Discharge Permit increasing the maximum <br /> groundwater discharge capacity from 1,000 to 2,000 gallons per day (gpd) <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 November 5. 2004 In <br /> accordance with the City of Stockton Department of Municipal Utilities Amended GDP <br /> requirements, the flog, total flow, and Lower Explosive Limits (LEL for gasoline) were <br /> continuously recorded Also in accordance with the GDP, on November 5, 2004, 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 8015B, <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) utilizing EPA method 8021B, and methyl <br /> 01 tertiary butyl ether (MTBE) utilizing EPA method 8260B <br /> s\625961reportslwaterdischargeV 0_04 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />...:�.-..�� •w _....,,_,a .--..;..�''�..-�--�-:...""""..--. r._�..,. �..__.:..�.t..--- =�••�._� rte- r..r_ �`_-�..,..1"' <br />