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,r <br /> CITY OF STOCKTON <br /> tVJNICIPAL UTILITIES DEPARTMENT <br /> �.. REGIONAL WASTEWATER CONTROL FACI11TY <br /> INTERIM POLICY: Regulating gasoline contaminated groundwater <br /> to the Sanitary Sewer System <br /> In the past, a limited number of permits have been issued Co <br /> r:+ discharge gasoline-contaminated groundwater into the sanitary <br /> sewer system. Due to the very small amounts of petroleum <br /> hydrocarbons and low discharge volumes, the permit <br /> restrictions have only addressed the need to prohibit free <br /> product and that the benzone xylene and toluene BXT <br /> p � xy ( ) <br /> collective concentrations not exceed 100 mg/l*. Within the <br /> last several months, a significant increase in permit <br /> applications have been submitted and the majority involve <br /> cleanup of groundwater that is .c,-)ntaminated with gasoline and <br /> diesel from leaking underground''stirage tanks. <br /> In order to uniformly regulate thesis discharges, the following <br /> interim p^licy is established: <br /> i <br /> 1. '.he maximum allowed concentration of total petroleum <br /> hydrocarbons in 'the ,discharge entering the sanitary sewer <br /> shall be 100 mg/L. Compliance with this provision will be <br /> .enforced by periodic self-mon:i.toring and laboratory <br /> analysis for total }petroleum hydrocarbons over the course <br /> oi` the discharge. Sample collection will be by grab <br /> collection techniques for volatile organics. The <br /> frequency of sampling will be specified by permit <br /> condition and will vary as to the volume, concentration <br /> and characteristics of the discharge. Analyses will be in <br /> accordance with Attachment 2, "Analytical procedures for <br /> the Detection and Quantification, of Total Petroleum Fuel <br /> Hydrocarbons and Duel Constituents" by the San Francisco <br /> Regional, Water Quality Control Board. <br /> 2. Permittees will be allowed to discharge a maximum <br /> runcentration of 4.57 mg/l of Total Toxic Organics (as <br /> currently listed by the Environmental Protection Agency ' <br /> r for categorical electroplating dischargers). Compliance <br /> with this provision will be en:Eorced by grab sample once <br /> during the permit term (e.g. , permit terms are usually <br /> annual, -but may under special esircumstances be issued for <br /> not more than two (2) years). Analytical procedures will <br /> be in accordance with EPA rule:irin Gu:.delines Establishing <br /> Test Procedures for the Analysis o!! Pollutants: Final <br /> b. Rule (40 CFR part. 136) Methods 624 and 625. <br /> *Thi: limitation is in accordance with Sec. 7-089.16 Specific <br /> Pollutant Limitations of the atockton Municipal Code <br /> Effective October 13, 1983. <br /> -l- <br />