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DATA USABILITY SUMMARY INTRODUCTION SAIC evaluated the analytical data for the following groundwater and water-matrix quality control samples collected on August 16,2006,at 35275 Welty Road in Vernalis, California: • QA-T-060816 (trip blank) • QA-R-060816(equipment rinsate blank) • WFSMW-I-W-060816(field sample) • WFSMW-1-060816 MS (matrix spike sample) • WFSMW-1-060816 MSD(matrix spike duplicate sample) • WFSMW-I-WD-060816 (field duplicate sample of WFSMW-I-W-060816) • MW-5-W-060816 Lancaster Laboratories performed all the analyses on the samples. All samples except the trip blank sample were analyzed for the following constituents: • Benzene,toluene, ethylbenzene, and total xylenes (BTEX)by U.S. Environmental Protection Agency(EPA)Method SW802IB; • Total petroleum hydrocarbons quantified as diesel-range organics (TPHd), carbon range Clo-C25, by EPA Method SW8015B; 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; • TPH quantified as gasoline-range organics(TPHg), carbon range C6-C12,by EPA Method SW8015B; and • Polynuclear aromatic hydrocarbons(PAHs)by EPA Method SW8270C with selected ion monitoring(SW8270C-SIM). The trip blank sample was analyzed only for BTEX by Method SW8021B. 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 The SAIC evaluated project analytical data according to the following parameters in order to determine their usability: • Precision, • Accuracy, • Representativeness, • Completeness, and