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One soil stockpile sample had detection for lead (Pb) at 120 milligrams per kilogram and <br /> therefore required evaluation under STLC and TCLP. The sample designated S18 <br /> (stockpile trench 18) reported a STLC detection of lead at 0.71 milligrams per liter and <br /> reported a TCLP detection of lead at 0.34 milligrams per liter. The sites leaching <br /> potential is low based one this result. <br /> AGE will collect additional samples from trenched areas as recommended by <br /> CalRecycle. Mostly south and southwest of the area previously tested, however <br /> sampling maybe limited by current co-generation plant structures. Trenching will <br /> additionally be conducted north of the railroad line, onto the northern parcel. Sample <br /> analysis will also include new testing for dioxins and furans within the soil-covered <br /> waste pile area. Results of the GPR survey will be available to generate a proposed <br /> mapping of trenches for LEA/CalRecycle review by 10 July with a schedule for the field <br /> work. <br /> Analysis of all soil samples for the full range of analytes seems excessive; initially, AGE <br /> recommends a limited number of samples analyzed for TTLC/STLC and a total of ten <br /> samples analyzed for dioxins, furans, PAHs and SVOCs. Additional analysis for target <br /> analytes could be performed to assist in the explanation of discrepancies of to fill any <br /> "data gaps"that my present once the additional data has been evaluated. <br /> CalRecycle Requirement: Install an LFG monitoring network in accordance with <br /> 27 CCR 20925 and implement an LFG monitoring program. <br /> AGE will prepare a scope of work for soil-gas monitoring within a workplan and submit <br /> to the LEA for review and permitting. AGE recommends this process begin immediately. <br /> Data collected will be evaluated and additional locations for potential land fill gas <br /> monitoring will be recommended, based upon initial sampling. If no gases are detected, <br /> AGE will remove the soil-gas monitoring network following the investigation. <br /> CalRecycle Requirement: Annotate the results of field testing on the topographic <br /> drawing to include: waste limits (boundary), trenching & boring sample locations, <br /> LFG monitoring wells and analytical testing results. <br /> Mapping of analytical results, waste depth/thickness and other sampling points will be <br /> generated in plan view, iso-each mapping and cross sections and will be included within <br /> the report of findings. As part of the report, an evaluation of the costs for cover support <br /> and maintenance will be demonstrated. <br />