SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD INSPECTION REPORT 9 October 1990 DISCHARGER: Dallas Corporation/ dba Overhead Door Company LOCATION & COUNTY: 1220 East Victor Road, Lodi , San Joaquin County CONTACT(S) : Charles Poole, C. Curtis Carter INSPECTION DATE: 5 September 1990 INSPECTED Bl': Jean McCue ACCOMPANIED BY: James Brathovde BACKGROUND: The Overhead/Lodi Door Company (O/LDC) discharged process wastes, from the manufacturing of galvanized steel doors and associated hardware components, to an unlined surface impoundment at its facility in Lodi . The impoundment received storm water and liquid and solid paint residue, in addition to the plant's process wastes. The contents of the surface impoundment were determined to be hazardous and the impoundment is regulated under the Toxic Pits Cleanup Act (TPCA) . The hazardous constituents in the waste were nickel and zinc. Chemical analysis of the original waste indicated concentrations of nickel above both the Total Threshold Limit Concentration (TTLC) and Soluble Threshold Limit Concentration (STLC) . Concentrations of zinc were below the TTLC, but above the STLC. Concentrations of chromium and lead were also elevated in the original pond waste, although not at hazardous levels. Six monitoring wells have been installed at the facility. The concentrations of nickel in the shallow ground water were originally as high as 0.09 mg/1 . It appeared that nickel had dissipated to where it is no longer detectable in any of the wells above concentrations of 0.001 mg/1 . However, in the 0/LDC's most recent ground water monitoring report (July 1990) , nickel was detected in three of the wells in concentrations ranging from 0.001 to 0.010 mg/1 . Chromium, on the other hand, has generally remained above the drinking water standard of 0.05 mg/l in monitoring well MW-1 and periodically in MW-2. The results of the July 1990 quarterly sampling event showed chromium was detected at concentrations of 0.046, and 0.081 mg/l in wells MW-1 , and MW-2, respectively. The O/LDC is in the process of closing the surface impoundment. A closure plan has been approved. They have excavated an additional 1,200 cubic yards of soil and collected confirmation samples on 16 May 1990. The samples were analyzed for nickel and zinc. Sample results showed elevated levels of nickel remain in two of the quadrants sampled, E and J (see Figure 1) . Since chromium is elevated in the ground water and was in the original waste, we needed to confirm that soils with elevated concentrations of chromium had been removed from the impoundment, along with the nickel . On 30 August 1990, the Board met with representatives from the O/LDC, Department of Health Services, Remediation Services,