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ATTACHMENT B: DATA USABILITY SUMMARY AND LABORATORY CHEMICAL ANALYTICAL REPORT LABORATORY DATA USABILITY SUMMARY Introduction SAIC evaluated the analytical data for the following groundwater and water-matrix quality control(QC) samples collected on May 3 and May 4,2006, at 35275 Welty Road in Vernalis, California: • QA-T-060503 (trip blank); • QA-R-060503 (equipment rinsate blank); • WFSMW-I-W-060503 (field sample); • WFSMW-I-WD-060503 field duplicate sample of WFSMW-I-W-060503); and • MW-5-W-060504(field sample). Lancaster Laboratories performed all the analyses on the samples. All samples except the trip blank sample were analyzed for the following: • Benzene,toluene, ethylbenzene, and total xylenes(BTEX)by EPA Method SW802IB; • Total petroleum hydrocarbons as diesel-range organics(TPHd), carbon range Clo-C25,by EPA Method SW8015 modified; • TPH as gasoline-range organics (TPHg), carbon range C6-C10,by EPA Method SW8015 modified; and • Polynuclear aromatic hydrocarbons (PAHs)by EPA Method SW8270C with SIM (SW8270C-SIM). The trip blank sample was only analyzed for BTEX by Method SW802113. A separate analysis for TPHd was also performed on sample WFSMW-I-W-060503 and field duplicate sample WFSMW-I-WD-060503 with a silica-gel procedure(based on EPA Method SW3630)prior to analysis to remove biogenic compounds. 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; Chevron Historical Pipeline Portfolio Sites, California, January 2006 (Updated); • 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 regarding petroleum releases attributed to Chevron's historical crude oil and Bunker C fuel oil pipelines. The data generated will be compared to respective Regional Water Quality Control Board water quality objectives and may be used for risk assessment evaluation.