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O/LDC —3— 12 July 1990 <br /> DHS <br /> SECTION NICKEL ZINC <br /> A -- <0.10 <br /> C -- 0.24 <br /> E 2.3 0.19 <br /> J 6.7 12 <br /> All concentrations are in mg/l <br /> -- = not analyzed <br /> INSPECTION SUMMARY <br /> The results from the analyses for nickel are in fairly close agreement between <br /> the two labs. However, the two labs reported very different results for zinc in <br /> samples A, C, E, H, and J. The Total Threshold Limit Concentrations (TTLC) for <br /> nickel and zinc are 2,000 and 5,000 mg/kg, respectively. The Soluble Threshold <br /> Limit Concentrations (STLC) for nickel and zinc are 20 mg/l and 250 mg/1 , <br /> respectively. The samples collected during this inspection contained nickel and <br /> zinc concentrations which were well below the STLC and TTLC values. However, <br /> soil still remains in the impoundment with concentrations of nickel and zinc <br /> above the established background levels of 16 and 60 mg/kg, respectively. <br /> The DHS will be doing a risk assessment for the impoundment, based on the <br /> remaining concentrations of nickel and zinc. The risk assessment should be <br /> completed by the end of July 1990. Although we have received the raw data from <br /> the samples collected during this inspection, we have not received a final report <br /> from RSI. The submittal of the report should coincide with the completion of the <br /> risk assessment so that we may determine the next step in closing the <br /> impoundment. <br /> AN McCUE <br /> Water Resource Control Engineer <br /> JEM:jm <br />