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ATTACHMENT C: DATA USABILITY SUMMARY AND LABORATORY ANALYTICAL REPORT INTRODUCTION SAIC evaluated the analytical data for the following groundwater and water-matrix quality control (QC) samples collected on February 11, 2009, at the US Can—Welty Road site in Vernalis, California: • MW-3-W-090211 • MW-3-W-090211 MS (matrix spike [MS]) • MW-3-W-090211 MSD (matrix spike duplicate [MSD]) • MW-3-WD-090211 (field duplicate) • QA-Boiler-R-090211 (equipment rinsate blank) Lancaster Laboratories, Inc. (Lancaster)performed all the analyses on the samples. Lancaster is certified by the State of California through the Department of Health Services to perform environmental analyses. Samples were analyzed for the following constituents of potential concern: • Total petroleum hydrocarbons quantified as diesel (TPHd), carbon range CIO-C25, by U.S. Environmental Protection Agency(EPA) Method SW8015 modified; a silica gel clean-up procedure based on EPA Method SW3630 was also performed on samples with TPHd detections to remove non-target biogenic compounds. • Polynuclear aromatic hydrocarbons (PAHs)by EPA Method SW8270C with large-volume injection. The data was evaluated in general conformance to the requirements of project objectives specified in the following documents: • Quality Assurance and Quality Control: Sample Collection, Handling, and Analysis Guidelines; Chevron Texaco Historical Pipeline Portfolio Sites, California, April 2007; • SAIC Technical Procedure TP-DM-300-7,Data Validation; and • SAIC Technical Procedure TP-DM-300-14,Evaluation of Field and Analytical Data. INTENDED USES OF THE DATA Laboratory data are being used for site evaluation and decision making for petroleum releases attributed to Chevron's historical crude-oil and Bunker C fuel-oil pipelines. The data generated will be compared to Regional Water Quality Control Board water quality objectives and may be used for risk assessment purposes.