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DATA USABILITY SUMMARY INTRODUCTION SAIC evaluated the analytical data for the following groundwater and water-matrix quality control(QC) samples collected on April 30, 2007, at 35275 Welty Road in Vernalis, California: • QA-R-070430(equipment rinsate blank) • MW-5-W-070430 • WFSMW-I-W-070430 • WFSMW-I-W-070430MS • WFSMW-I-W-070430MSD Lancaster Laboratories, Inc.performed all the analyses on the samples. All samples were analyzed for the following constituents: • Total petroleum hydrocarbons quantified as diesel-range organics (TPHd), carbon range C10-C25, by U.S. Environmental Protection Agency(EPA)Method SW801513; a silica gel-cleanup 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 selective ion monitoring(SW8270C-SIM). The data was evaluated in general conformance to the requirements of project objectives specified in the following documents: • Quality Assurance& Quality Control:Sample Collection, Handling, and Analysis Guidelines; ChevronTexaco Historical Pipeline Portfolio Sites, California,January 2006; • 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. DATA QC OBJECTIVES SAIC evaluated the project analytical data according to the following parameters in order to determine their usability: • Precision • Accuracy • Representativeness • Completeness • Comparability DATA USABILITY SUMMARY The following sections summarize the findings of the data evaluation process. The following data validation qualifiers were used in the data evaluation: ualifier Description J Indicates the reported value is an estimated concentration detected between the method detection limit(MDL)and limit of quantitation(LOQ).