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L E <br /> ADDITIONAL ASSESSMENT WORKPLAN <br /> COLBERG1 BOAT WORKS <br /> APRIL 2001 <br /> Groundwater samples will be collected.using new disposable bailers at each well. The <br /> groundwater sample will be decanted from the.bailer into laboratory provided containers, placed <br /> into chilled coolers and transported to a state certified laboratory under proper GOC <br /> documentation. <br /> Groundwater Analyses <br /> The groundwater will be analyzed by a California certified laboratory in accordance with state <br /> guidelines and EPA protocol. The groundwater samples will be analyzed for TPH G, BTEX, 1,2- <br /> DCA, EDB, and fuel oxygenates using-EPA Methods 8015M, 8020 and 8260B, respectively. <br /> Site Survey <br /> Following installation of the groundwater monitoring wells, the location and elevation of the wells <br /> will be surveyed to the nearest 0.01 vertical foot. The elevation will be tied to the existing well <br /> t casing elevations. Static groundwater.levels will be measured to the nearest 0.01-foot. These <br /> data will be added to the site's data base. <br /> SUMMARY REPORT <br /> GHH will prepare an AAR to document this phase of work. The report will include: GHH's <br /> interpretation of information gathered during the investigation;.detailed descriptions of the <br /> methodologies used to collect and analyze the data; analytical results;the total estimated mass of <br /> k impacted soil and groundwater;the estimated rate:of transport of groundwater away from the <br /> site; copies of laboratory certificates with COC documentation; subcontractor reports; <br /> conclusions.and recommendations. <br /> QUARTERLY MONITORING <br /> Quarterly sampling of the new wells will be initiated.. Monitoring wells MW-1, MW-2, MW-3 <br /> and MW-7 (new well)will be included in the sampling program Depths to groundwater <br /> measurements will be taken and the groundwater monitoring wells will be purged and sampled. <br /> Groundwater samples will be analyzed for the same parameters as previously identified unless <br /> otherwise directed by the County. A Quarterly Monitoring Report(QMR) will be issued <br /> following each quarterly monitoring event. <br /> 6 <br />