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ATTACHMENT C: <br /> DATA USABILITY SUMMARY AND LABORATORY ANALYTICAL REPORTS <br /> INTRODUCTION <br /> Science Applications International Corporation (SAIC) evaluated the analytical data for soil and <br /> groundwater samples collected at the Alden Park location in Tracy, California. This data <br /> usability summary presents the results of the data validation process. SAIC collected <br /> environmental samples on behalf of Chevron Environmental Management Company to delineate <br /> the lateral and vertical extent of petroleum-affected water. The following samples were collected <br /> on January 16, 2009: <br /> • MW-4-W-090115 • MW-11-W-090115 • MW-7-W-090116 <br /> • QA-Pump-R-090115 • MW-12-W-090115 • MW-9-W-090116 <br /> • MW-8-W-090115 • MW-12-W-090115MS <br /> • MW-10-W-090115 • MW-12-W-090115MSD <br /> • MW-10-WD-090115 • MW-14-W-090115 <br /> Groundwater samples were analyzed for one or more of the following constituents of potential <br /> ' concern: <br /> • Polynuclear aromatic hydrocarbons (PAHs)by U.S. Environmental Protection Agency <br /> (EPA) Method SW8270C with a large-volume injection. <br /> • Total petroleum hydrocarbons quantified as diesel(TPHd), carbon range Cep-C25, by EPA <br /> Method SW8015B modified; a silica gel-cleanup procedure based on EPA Method <br /> SW3630 was also performed on samples with TPHd detections to remove non-target <br /> biogenic compounds <br /> The data was 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; and <br /> • SAIC Technical Procedure TP-DM-300-14,Evaluation of Field and Analytical Data. <br /> INTENDED USES OF THE DATA <br /> Laboratory data are being used for site evaluation and decision making for petroleum releases <br /> attributed to Chevron's historical crude-oil and Bunker C fuel-oil pipelines. For contaminant <br /> delineation decision making, groundwater laboratory analytical results were compared to "action <br /> levels," or levels above which further evaluation to define the extent of contamination is <br /> appropriate. <br /> DATA QUALITY CONTROL OBJECTIVES <br /> SAIC evaluated project analytical data according to the following parameters to determine their <br /> usability: <br /> • Precision <br /> • Accuracy <br />