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CENTRAL VALLEREGIONAL WATER QUALITPCONTROL BOARD <br /> INSPECTION REPORT <br /> 19 November 1990 <br /> DISCHARGER: Dallas Corporation/ dba Overhead Door Company <br /> LOCATION & COUNTY: 1220 East Victor Road, Lodi , San Joaquin County <br /> CONTACT(S) : Charles Poole, C. Curtis Carter <br /> INSPECTION DATE: 22 October 1990 <br /> INSPECTED BY: Jean McCue <br /> ACCOMPANIED BY: -- <br /> BACKGROUND: <br /> The Overhead/Lodi Door Company (0/LDC) discharged process wastes, from the <br /> manufacturing of galvanized steel doors and associated hardware components, to an <br /> unlined surface impoundment at its facility in Lodi . The impoundment received storm <br /> water and liquid and solid paint residue, in addition to the plant's process wastes. <br /> The contents of the surface impoundment were determined to be hazardous and the <br /> impoundment is regulated under the Toxic Pits Cleanup Act (TPCA) . <br /> The hazardous constituents in the waste were nickel and zinc. Chemical analysis of the <br /> original waste indicated concentrations of nickel above both the Total Threshold Limit <br /> Concentration (TTLC) and Soluble Threshold Limit Concentration (STLC) . Concentrations <br /> of zinc were below the TTLC, but above the STLC. Concentrations of chromium and lead <br /> were also elevated in the original pond waste, although not at hazardous levels. <br /> Six monitoring wells have been installed at the facility. The concentrations of nickel <br /> in the shallow ground water were originally as high as 0.09 mg/1 . It appeared that <br /> nickel had dissipated to where it is no longer detectable in any of the wells above <br /> concentrations of 0.001 mg/1 . However, in the 0/LDC's most recent ground water <br /> monitoring report (July 1990) , nickel was detected in three of the wells in <br /> concentrations ranging from 0.001 to 0.010 mg/l . <br /> Chromium, on the other hand, has generally remained above the drinking water standard <br /> of 0.05 mg/l in monitoring well MW-1 and periodically in MW-2. The results of the July <br /> 1990 quarterly sampling event showed chromium was detected at concentrations of 0.046, <br /> and 0.081 mg/l in wells MW-1, and MW-2, respectively. <br /> OBSERVATIONS AND COMMENTS: <br /> On 22 October 1990, I conducted an inspection of the 0/LDC facility. Brian Pletcher <br /> and Edgardo Urbano, from Remediation Services, Inc. (RSI) , were on site to collect <br /> ground water samples as part of the 0/LDC's quarterly ground water monitoring program. <br /> Analysis for hexavalent chromium has been added to the monitoring program. Samples <br /> collected during this inspection are the first to be analyzed for hexavalent chromium. <br /> I collected split samples from the two wells which had the highest concentrations of <br /> total chromium in the past, MW-1 and MW-2. <br />