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Mr. Marcus Pierce, Engineering Ologist February 2012 <br />Central Valley Regional Water Quality Control Board <br />Subject: Copper Sulfate Impacted Soil Removal <br />previously detected arsenic concentrations indicated above appear to be consistent with typical <br />background values, and are not the focus of the proposed removal action. <br />All project samples will be submitted and analyzed at a laboratory that is certified by the State of <br />California Environmental Laboratory Accreditation Program (ELAP) and accredited by <br />Department of Defense (DoD) ELAP. Laboratory -specific Quantitation Limits (QLs) and MDLs <br />for target compounds in soil and groundwater grab samples are presented in the table below. <br />QLs and MDLs for all analytes addressed using the analyses listed below will be included with <br />laboratory reports in the Removal Action Report discussed below. <br />Quantitation Limits and Method Detection Limits <br />for Target Analytes in Soil and Groundwater <br />Method <br />Analyte <br />QL <br />MDL <br />Metals in Soil (mgft) <br />EPA 6010B/7000 <br />Arsenic <br />0.25 <br />0.083 <br />EPA 601013/7000 <br />Copper <br />0.25 <br />0.086 <br />Anions in Soil (mgft) <br />EPA 9056 <br />Sulfate <br />5.0 <br />0.47 <br />Metals in Groundwater (lig/L) <br />EPA 60, <br />Copper <br />5.0 <br />1.4 <br />Anions in Groundwater (mg/L) <br />EPA 9056 <br />Sulfate <br />F-0.51 <br />0.047 <br />Notes: QL = Quantitation Limit <br />MDL = Method Detection Limit <br />mg/Kg = milligrams per kilogram, or parts per million <br />pg/L = micrograms per Liter, or parts per billion <br />mg/L = milligrams per Liter, or parts per million <br />After confirmatory soil sample collection, the excavation will be backfilled with non-compressible <br />clean borrow material and compacted using the backhoe bucket or a sheepsfoot roller backhoe <br />attachment. Compaction testing will not be conducted for the site, as we anticipate that the <br />borrow material and proposed compaction method will render the location suitable for its <br />previous use (i.e., vehicle parking/equipment storage). The excavation area will then be graded <br />flush with the adjacent contours of the site and the paved with rough asphalt to match the <br />surrounding ground surface. Equipment will be demobilized from the site following completion of <br />these activities. <br />This approach to excavation, confirmatory soil sampling, and backfilling during a single <br />mobilization is preferred for the following reasons: <br />• The impacts to soil are presumed to be limited in extent and, in general, will be visually <br />definable; <br />Oneida Total Integrated Enterprises, LLC Page 4 of 6 <br />