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Soil Sample Analysis: <br /> 1. The Department recommends assigning a sample identification <br /> number to each proposed sample and listing the analysis to <br /> be performed on each sample or group of samples and each <br /> method's detection limit. The Work Plan currently shows in <br /> the table on page 6 that samples from the ultra etch storage <br /> area and the southern portion of the site will be analyzed <br /> for arsenic and copper using the 7000 series methods. This <br /> does not agree with Figure 2 that shows these samples will <br /> be analyzed for metals and VOCs by method 8010. The Work <br /> Plan should identify the specific 7000 series methods to be <br /> used for copper and arsenic. <br /> 2 . The Work Plan does not contain Quality Assurance/Quality <br /> Control (QA/QC) measures to be implemented as part of the <br /> soil sample analysis. The Department recommends taking <br /> duplicate samples (10%) and use of a method blank and <br /> laboratory spikes. The results of the sampling should be <br /> accompanied by a description of the laboratory's internal <br /> QA/QC procedures. <br /> 3 . The Work Plan should include more information regarding the <br /> samples to be collected from a depth of ten feet and held <br /> for analyses until the analysis of shallower depths is <br /> complete. Will the laboratory's turnaround time be shorter <br /> than the 14 day holding time for the samples? Will the <br /> samples be extracted by the lab and then held for analysis; <br /> thereby, allowing more time to complete the analysis of the <br /> shallower depths? <br /> 4 . The Work Plan should identify analysis methods for the <br /> samples that may be collected at fine grained intervals <br /> identified by the continuous cores. <br /> Soil Sample Analysis Rationale: <br /> 1. Soil samples in the vicinity of the former ultra etch <br /> storage area should be analyzed for VOCs as well as arsenic <br /> and copper. The background information on operations at the <br /> site is insufficient to exclude this area from investigation <br /> for VOC contamination. <br /> Well Drilling Installation Construction Development. and <br /> Sampling- <br /> Pursuant to our telephone discussion on November 20, 1992 , the <br /> Work Plan will not include installation of a monitoring well . <br /> The Department will determine the need to collect ground water <br /> samples after the results from the soil samples are reviewed. <br /> J <br />