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' Revised Soil and Groundwater Investigation Work Plan Mountain House Development Site#6 July 2007 Soil Boring Abandonment Soil borings will be sealed and abandoned in accordance with SJCEHD requirements. Following abandonment,each soil boring will be located using a Global Positioning System unit. Boring locations will be surveyed for x and y coordinates with reference to the North American Datum 83 State Plane Zone 3 U.S. These data will be used to place the borings on a geo-referenced base map. ' 3.4 QUALITY ASSURANCE/QUALITY CONTROL AND DATA USABILITY Field sampling will be conducted in accordance with SAIC's Quality Assurance and Quality Control Sample Collection, Handling, and Analysis procedures(SAIC,2007a). In accordance with those procedures,quality assurance samples will be collected and analyzed according to the specifications listed in Table 3. Requests for trip blank, equipment rinsate blank, duplicate, and matrix spike/matrix spike duplicate analyses will be specified on the chain-of-custody form. ' After receipt of all final laboratory reports, SAIC will perform a data usability evaluation to determine whether the data can be used for their intended purposes. The evaluation will be summarized in the Data Usability Summary of the subsequent Soil and Groundwater Investigation Report(SGIR). ' 3.5 INVESTIGATION-DERIVED WASTE(IDW) IDW—soil cuttings and unused soil sample,disposable sampling equipment,used personal protective ' equipment,and decontamination water—will be placed in U.S.Department of Transportation-rated, 55-gallon drums that will be properly labeled, secured,and stored pending disposal by Sturgeon& Son, Inc.,a direct-bill CEMC contractor. Existing soil and groundwater profiles from previous investigation t results may be used to characterize the IDW. If needed,composite IDW samples will be collected and submitted to Lancaster for profiling. IDW will be segregated, sampled, analyzed,and disposed of consistent with Chevron's Operational Excellence Process document entitled HPP-BTR Waste ' Management Process(Chevron, 2006). 4. REPORTING AND SCHEDULE ' SAIC will evaluate project data to determine the extent of affected soil and groundwater and prepare a SGIR that will document the project results. The SGIR will contain the elements identified in, and project data will be evaluated in accordance with,the draft document entitled Guidelines for Soil and ' Groundwater Investigation Reports(SAIC,2007b). The report will present conclusions and recommendations to facilitate any future additional investigation,risk assessment,and/or remedial options required to attain No Further Action status. ' SAIC anticipates beginning the investigation within 30 days following RWQCB acceptance of this work plan and procurement of all necessary permits,bonds,and access agreements. The associated SGIR will be submitted to the RWQCB no later than 90 days after receipt of all final laboratory reports. ' 5. REFERENCES Chevron, 2006. HPP-BTR Waste Management Process. January. ' Condor, 2001. Chevron Pipeline Easement Assessment Report-Mountain House, California, Volume 1 and 2. November. ' DWR, 2003. California's Groundwater,Bulletin 118,2003 Update. EPA,2004. Region 9 PRGs Table. hn://www.epa.gov/region9/waste/sfund/prglindex.html#t)rgtable. October. t Geomatrix,2005. Technical Approach to Site Evaluation and Decision-Making, Historical Pipeline Portfolio, Central Valley Region. February. 1 6 From Science m Solutions