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V 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> %T(M <br /> www atc-enviro com <br /> 209 579 2221 <br /> • A s s o c i a r e s I w o Fax 209 579 2225 <br /> February 13, 2003 <br /> 54 62596 0001 <br /> Mr Richard Stiffler <br /> City of Stockton <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Subject Groundwater Discharge Permit at Farmer Property, 610 North Hunter Street, <br /> Stockton, California <br /> Dear Mr Stiffler <br /> ATC Associates Inc is submitting this request for the modification of the Groundwater Discharge <br /> Permit (GDP) approved by the City of Stockton Department of Municipal Utilities on November 6, <br /> 2002 During the January 2003 self-monitoring for the discharge system located at 610 North <br /> • Hunter Street in Stockton, California (Figure 1), it was observed that the daily discharge of treated <br /> groundwater exceeded the permitted amount under the GDP of 1,000 gallons per day (gpd) During <br /> the January 2003, the groundwater treatment system had an average flowrate of 0 89 gallons per <br /> minute (gpm) and 1,279 gpd <br /> The increased amount of discharged groundwater is likely due to modifications made to the vapor <br /> extraction system to increase vapor extraction efficiency ATC is requesting that the GDP be revised <br /> to include a 2,000-gallon per day maximum of discharge groundwater Please advise me of any <br /> additional information or reporting requirements that are necessary or any additional fees <br /> If you require any additional information, please contact our office at(209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc � <br /> Drew Van Allen <br /> Senior Protect Manager <br /> a"eHomsey, P E <br /> CA Registered Civil Engineer No 47410 <br /> acc Mr and Mrs Raymond Farmer <br /> w lwordpro162596Iletterslpermctrevise doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />