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California Regional Water Quality Control Board <br /> Central Valley.Region <br /> Steven T.Butler,Chair <br /> +inston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Intemet Address: http://w .swcb.ca.gov/—mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3164 <br /> TO: Wendy L. Cohen Chief FROM: Amy S. Terrell <br /> Site Cleanup Unit Site Cleanup Uni <br /> �j <br /> DATE: 7 September 2000 SIGNATURE: <br /> SUBJECT: NO FURTHER ACTION REQUIRED MEMORANDUM, UNDERGROUND <br /> STORAGE TANK, KOPPEL STOCKTON TERMINAL, 2025 W ST HAZELTON <br /> AVENUE, STOCKTON, SAN JOAQUIN COUNTY RW QCB <br /> Two underground fuel storage tanks'were removed from the Koppel Stockton Terminal in 1989. Soil <br /> samples obtained in 1989 showed a maximum concentration of total petroleum hydrocarbons as diesel <br /> (TPHd) at 62 mg/kg. The underground storage tank(UST) site was not formally closed, and in May <br /> 2000 Leah Goldberg, the attorney for the current property owner, asked that the site be formally closed. <br /> Unrelated to the underground storage tanks, the Koppel Stockton Terminal completed an investigation <br /> and began remediation in early 2000 for nitrate and ammonium contaminants. We are the lead agency <br /> for this cleanup. In a 4 February 2000 telephone consultation with Mr. Michael Infurna of the San <br /> Joaquin County Public Health Services, we agreed that Regional Board staff should also be lead agency <br /> for the underground storage tank, since we are also overseeing the nitrate site cleanup activities. <br /> The consulting firm Advanced GeoEnvironmental submitted a 7 April 2000 Soil and Groundwater <br /> Sampling Report that discusses soil and groundwater samples it obtained to determine if the UST site <br /> could be closed. The highest concentration of any constituent detected in soils during the original <br /> excavation was 62 mg/kg total petroleum hydrocarbons as diesel (TPHd). The maximum concentration <br /> found in March 2000 was 3.9 mg/kg TPHd at six feet below ground surface (bgs). Groundwater is <br /> encountered between four and 12 feet bgs. No petroleum constituents or fuel oxygenates were detected <br /> in a nearby monitoring well (KP-3). <br /> The concentration of petroleum hydrocarbons have declined over the last decade, and the relatively low <br /> concentrations of hydrocarbons remaining are unlikely to pose a threat to human health or waters of the <br /> state. <br /> California Environmental Protection Agency <br /> co,Recycled Paper <br />