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• MEMORANDUM • CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION %3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: FILE FROM: JEAN McCUE Water Resource Control Engineer DATE: 3 October 1990 SIGNATURE: SUBJECT: MEETING TO DISCUSS STATUS OF SURFACE IMPOUNDMENT AND GROUND WATER INVESTIGATION AT THE DALLAS CORPORATION, DBA OVERHEAD/LODI DOOR COMPANY (O/LDC) FACILITY IN LODI, SAN JOAQUIN COUNTY ATTENDED BY: Linda Hogg, Department of Health Services (DHS) Charlie Poole, Overhead/Lodi Door Company (O/LDC) John Schweizer, Remediation Services, Inc. (RSI) David Glick, BSK and Associates (BSK) Greg Vaughn, Regional Board (Board) Jean McCue, Regional Board This is a summary of topics discussed at the 30 August 1990 meeting held between representatives from the 0/LDC, RSI, BSK, DHS, and the Board. The purpose of the meeting was to discuss the results of DHS's risk assessment for contaminated soils remaining in the impoundment, pond closure steps, and ground water monitoring and assessment at the facility. HEALTH RISK ASSESSMENT Ms. Hogg presented the results of the risk assessment completed by DHS's in-house toxicologist, Yugal Luthra (Attachment A) . Mr. Luthra used DHS's lab results from the confirmation sampling on 16 May 1990, instead of RSI's. The samples were analyzed for nickel and zinc. Mr. Luthra concluded that, on the basis of the analytical data presented, the levels of nickel and zinc in soils are unlikely to present a potential for adverse health effects, provided the backfill material does not affect the levels of the contaminants in the soils. POND CLOSURE STEPS The last confirmation sampling, on 16 May 1990, showed that concentrations of nickel and zinc are the highest in quadrants E (240 mg/kg) and J (110 mg/kg) in the impoundment (see Figure 1) . Waste Extraction Tests (WET) , with a citrate extraction solution, were performed on samples form quadrants A,C,E, and J. The extracts from samples from quadrants E and J were the only two analyzed for nickel . The results showed soluble nickel remains in the impoundment. The concentrations of nickel in the two samples from quadrants E and J were 2.3 mg/l and 6.7 mg/1 , respectively. The Soluble Threshold Limit Concentration (STLC) for nickel is 20 mg/l . Greg Vaughn stated that the Board's goal is to minimize the amount of soluble nickel in the impoundment. Ms. Hogg suggested that the O/LDC remove a more soil in those two areas. Mr. Poole stated that they do not want to do any more excavating. He feels they have removed the majority of the waste and because the DHS is satisfied with what remains in the impoundment, there should be no further excavation.