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DATA USABILITY SUMMARY <br /> INTRODUCTION <br /> SAIC evaluated the analytical data for the following groundwater and water-matrix quality control(QC) <br /> samples collected on November 8,2006,at 35275 Welty Road in Vernalis, California: <br /> • QA-T-061108 (trip blank) <br /> • QA-R-061108 (equipment rinsate blank) <br /> • MW-5-W-061108 <br /> • MW-3-W-061108 <br /> • WFSMW-I-W-061108 <br /> Lancaster Laboratories performed all the analyses on the samples. All samples except the trip blank <br /> sample were analyzed for the following constituents: <br /> • Benzene,toluene, ethylbenzene, and total xylenes (BTEX)by U.S. Environmental Protection <br /> Agency(EPA)Method SW802IB; <br /> • Total petroleum hydrocarbons quantified as diesel-range organics (TPHd), carbon range Clo-C25, <br /> by EPA Method SW8015B; a silica gel-cleanup procedure based on EPA Method SW3630 was <br /> also performed on samples with TPHd detections to remove non-target biogenic compounds; <br /> • TPH quantified as gasoline-range organics(TPHg), carbon range C6-C12,by EPA Method <br /> SW8015B; and <br /> • Polynuclear aromatic hydrocarbons(PAHs)by EPA Method SW8270C with selected ion <br /> monitoring(SW8270C-SIM). <br /> The trip blank sample was analyzed only for BTEX by Method SW8021B. <br /> The data was evaluated in general conformance to the requirements of project objectives specified in the <br /> following documents: <br /> • Quality Assurance& Quality Control: Sample Collection, Handling, and Analysis Guidelines; <br /> ChevronTexaco Historical Pipeline Portfolio Sites, California,January 2006; <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 attributed <br /> to Chevron's historical crude oil and Bunker C fuel oil pipelines. The data generated will be compared to <br /> Regional Water Quality Control Board water quality objectives and may be used for risk assessment <br /> purposes. <br /> DATA QC OBJECTIVES <br /> The SAIC evaluated project analytical data according to the following parameters in order to determine <br /> their usability: <br /> • Precision <br /> • Accuracy <br /> • Representativeness <br /> • Completeness <br /> • Comparability <br />