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NCA Drywell Closure and Investigation Work Plan Page 10 of 16 March 18, 2014 3.6.2 Laboratory OC/OA Laboratory QC/QA will consist of the following: I • Method Blanks • Lab Control Spikes • Lab Control Spike Duplicates • Matrix Control Spikes • Matrix Control Spike Duplicates • Surrogate Recoveries ' The laboratory analytical reports will provide a detailed summary of the QC/QA sample results, a written statement affirming that QC was met, and a description of any discrepancies that may have occurred. Holding Time Compliance I Sample preparation and analysis will be completed within the required method holding times, including 14 days for Volatile Organics, Total Petroleum Hydrocarbons, and Total Recoverable Petroleum Hydrocarbons, 7 days for semi-volatile organics, 180 days for most metals, and 28 ' days for mercury. Samples will be analyzed within five (S) days of collection; no preservatives are required for the desired analyses. Holding time begins at the time of sample collection. If holding times are exceeded, and the analyses are performed, the associated results will be qualified as described in the applicable validation procedure. The following definitions of extraction and analysis compliance are used to assess holding times: Preparation or extraction completion - completion of the sample preparation process as described in the applicable method, prior to any necessary extract cleanup. ' Analysis completion - completion of all analytical runs, including dilutions, second-column confirmations, and any required re-analyses. Sample Preservation Sample preservation both before and after relinquishment into laboratory custody will be compared to the acceptable preservation and holding methods described in this work plan. If any inconsistencies are detected, the data will be qualified as described in the applicable validation procedure. 1 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02014 Neil O.Anderson&Associates,Inc