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ATTACHMENT C: <br /> DATA USABILITY SUMMARY AND LABORATORY ANALYTICAL REPORTS <br /> INTRODUCTION <br /> ' SAIC-Benham evaluated the analytical data for groundwater samples collected at the Alden Park <br /> site in Tracy, California. This data usability summary presents the results of the data review and <br /> ' validation process. SAIC-Benham collected environmental'samples on behalf of Chevron <br /> Environmental Management Company to delineate the lateral and vertical extent of petroleum- <br /> affected groundwater. Groundwater and water-matrix quality control (QC) samples were <br /> ' collected on January 5 and 6, 2010. The following samples were collected: <br /> • MW-4-W-100106 <br /> ' • MW-7-W-100105 <br /> • MW-8-W-100105 <br /> • MW-9-W-100106 <br /> ' • MW-10-W-100105 <br /> • MW-10-WD-W-100105 (field duplicate) <br /> • MW-11-W-100105 <br /> ' • MW-12-W-100105 <br /> • MW-12-W-100105MS (matrix spike sample) <br /> • MW-12-W-100105MSD (matrix spike duplicate sample) <br /> ' • MW-14-W-100105 <br /> • QA-Tubing-R-100105 (equipment rinsate blank) <br /> ' Lancaster Laboratories, Inc. (Lancaster)performed all the analyses on the samples. The data <br /> were reported in laboratory report 1177787. Lancaster is certified by the State of California <br /> through the Department of Health Services to perform environmental analyses. <br /> ' The samples were analyzed for the following constituents: <br /> • Polynuclear aromatic hydrocarbons (PAHs)by United States Environmental Protection <br /> ' Agency(EPA) Method SW8270C with large-volume injection. <br /> • Total petroleum hydrocarbons quantified as diesel (TPHd), carbon range Clo-C25,by EPA <br /> Method SW8015 modified; a silica gel clean-up procedure based on USEPA Method <br /> ' SW3630 was also performed on samples with TPHd detections to remove non-target <br /> biogenic compounds. <br /> The data were evaluated in general conformance to the requirements of project objectives <br /> specified in the following documents: <br /> • Quality Assurance and Quality Control: Sample Collection, Handling, and Analysis <br /> Guidelines; ChevronTexaco Historical Pipeline Portfolio Sites, California, April 2007. <br /> • SAIC Technical Procedure TP-DM-300-7,Data Validation. <br /> ' • SAIC Technical Procedure TP-DM-300-14,Evaluation of Field and Analytical Data. <br /> C-1 <br /> 1 <br />