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t <br /> STAFF REPORT <br /> DALLAS CORPORATION, DBA OVERHEAD/LODI DOOR COMPANY, <br /> LODI, SAN JOAQUIN COUNTY <br /> The Dallas Corporation, dba Overhead/Lodi Door Company (0/LDC) owns and operated <br /> a door manufacturing facility in the NW 1/4 of the SE 1/4 of Section 6, T3N, R7E, <br /> MDB&M. The nine acre facility is at 1220 E. Victor Road (Highway 12), near Cluff <br /> Avenue and is surrounded by a mixture of industrial , commercial , and residential <br /> property in Lodi , San Joaquin County. <br /> 0/LDC has historically operated an unlined surface impoundment which contained <br /> surface water runoff, liquid and solid paint residue, process wastes generated <br /> from the manufacturing of galvanized steel doors and associated hardware <br /> components, and possibly spent solvents. The surface impoundment functioned as <br /> a settling basin and evaporation pond, since its construction around 1960. <br /> The contents of the impoundment were sampled in April 1985 by the Department of <br /> Health Services (DHS) . Both pond water and bottom sludge samples were collected <br /> and analyzed. Results of the chemical characterization of the impoundment <br /> sludges showed it contained concentrations of nickel above the total and soluble <br /> threshold limit concentrations (TTLC and STLC) of 2000 mg/kg and 20 mg/l , <br /> respectively. Zinc concentrations did not exceed the TTLC of 5000 mg/kg, but did <br /> exceed the STLC of 250 mg/1 . Chromium and lead concentrations were elevated, but <br /> below their respective TTLC and STLC values. <br /> Concentrations of metals above TTLC and STLC are considered hazardous according <br /> to the toxicity criteria established in Article 17, Title 22 of the California <br /> Code of Regulations. Therefore, the waste was classified as hazardous. The <br /> impoundment was found to be subject to the Toxic Pits Cleanup Act (TPCA) , Health <br /> and Safety Code, Section 25208 et seq. in November 1985. <br /> As of 8 November 1985, wastes were no longer discharged to the impoundment. The <br /> Department of Health Services (DHS) was the lead agency for closure of the <br /> surface impoundment. 0/LDC completed the surface impoundment closure in <br /> Novsatisfied19he requi90 rements of theto a ure TPCA and lan waspved removed from DHS and <br /> he eprBogram, asLDC <br /> of <br /> 31 December 1990. <br /> Six monitoring wells were installed at the facility as part of a ground water <br /> assessment plan (Attachment A) . Wells MW-1, MW-2, and MW-3 were installed at the <br /> end of 1985, MW-4 in 1987, MW-6 in 1988, and MW-5 in 1989. Wells MW-1 through <br /> MW-5 were installed in the first water bearing zone, and MW-6 was installed in <br /> the second, deeper, water bearing zone. The shallow wells are 63 feet deep (with <br /> the 57 <br /> deep. Intion of December11985,hich w terslevelseindthe) nd first thr eew wells werehe der well � roughlye43 <br /> to 44 feet below the top of casing. December 1991 water levels in those three <br /> wells were roughly 58 to 60 feet below the top of casing. The ground water flow <br /> direction in the first water bearing zone has varied over the last six years. <br /> However, it is generally in a southerly to southeasterly direction. <br /> Concentrations of nickel in the shallow ground water were originally as high as <br /> 90 99/1 • It appears that nickel had dissipated to where it is no longer <br />