Laserfiche WebLink
0/LDC ANNUAL INSPECTION -2- 9 October 1990 <br /> Inc. (RSI) , and BSK and Associates. During the meeting we asked RSI to analyze three <br /> of the samples collected 16 May 1990, including-those from quadrants E and J, for total <br /> chromium. However, RSI's lab no longer had the two samples. We also wanted to look <br /> for the presence of chromium VI, which has a sample holding time of 24-hours. <br /> Therefore, we needed to collect additional samples. <br /> OBSERVATIONS AND COMMENTS: <br /> On 5 September 1990, I conducted the TPCA annual inspection of the O/LDC facility. I <br /> was accompanied by James Brathovde, from our office, TPCA Unit. The main purpose of <br /> the inspection was to collect additional confirmation samples from two areas that were <br /> shown to have elevated concentrations of nickel . The samples were analyzed for total <br /> chromium and chromium VI . Brian Pletcher from Remediation Services, Inc. (RSI) <br /> collected split samples for duplicate analysis. <br /> Samples were collected from sections E and J, the two quadrants with the highest <br /> concentration of nickel . Five samples were collected from each area to form a <br /> composite sample (one composite per area) . In area J, samples were collected adjacent <br /> to the locations of the 16 May 1990 confirmation samples. The 16 May 1990 sample <br /> locations were marked with orange flagging. The top three inches of soil was removed <br /> with a shovel , prior to sampling, to reach the undisturbed soil in area E. The top one <br /> to two inches of soil was removed with a rock hammer in area J, the sidewall . Samples <br /> were collected with a hand sampler and placed in a clean plastic bag, where they were <br /> composited. The samples were split between Mr. Pletcher and I and placed in clean <br /> glass jars. The jars were labeled and placed in an iced cooler. Mr. Brathovde and I <br /> delivered the Regional Board's samples directly to Anlab laboratory for analysis, on <br /> our way back to the office. Both samples were analyzed for total chromium and chromium <br /> VI . Sample results are shown below. <br /> Analyses of the confirmation samples collected on 16 May 1990, showed that <br /> concentrations of nickel were the highest in quadrants E (240 mg/kg) and J (110 mg/kg) <br /> in the impoundment (see Figure 1) . The results of the Waste Extraction Tests (WET) , <br /> using a citrate extraction solution, performed on those samples showed soluble nickel <br /> remains in the impoundment. The concentrations of soluble nickel in the two samples <br /> from quadrants E and J were 2.3 mg/l and 6.7 mg/l , respectively. The Soluble Threshold <br /> Limit Concentration (STLC) for nickel is 20 mg/1 . During our 30 August 1990 meeting, <br /> we asked that RSI run WET's on the samples from quadrants E and J, using the de-ionized <br /> (DI) water extraction solution, and analyze for nickel . This should more closely <br /> estimate the potential for leaching nickel from the impoundment. Since those samples <br /> were no longer available, RSI ran the test on the samples collected during this <br /> investigation. The results are presented below. <br /> SAMPLE RESULTS <br /> The laboratory results of the samples collected by the Regional Board are as follows: <br /> Quadrant Total Chromium Chromium VI <br /> E 15 <0. 1 <br /> J 7.2 <1.0* <br /> Concentrations in mg/kg <br /> -- = Not analyzed <br />