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DATA USABILITY SUMMARY <br /> INTRODUCTION <br /> SAIC evaluated the analytical data for groundwater samples collected at the offsite Vernalis Pump Station <br /> location in Vernalis, California. This data usability summary presents the results of the data validation <br /> process. SAIC collected environmental samples on behalf of Chevron Environmental Management <br /> Company to delineate the lateral and vertical extent of petroleum-affected groundwater. Samples were <br /> collected on April 9, 2008 and July 17, 2008: <br /> • QA-Pump-R-080409 <br /> • MW-6-W-080409 BKG <br /> • MW-6-W-080409 MS <br /> • MW-6-W-080409 MSD <br /> • MW-7-W-080409 <br /> • QA-PUMP-R-080717 <br /> • MW-7-W-080717 <br /> • MW-7-WD-080717 <br /> • MW-6-W-080717 <br /> • MW-3-W-080717 <br /> • MW-2-W-080717 <br /> • MW-5-W-080717 BKG <br /> • MW-5-WD-080717 MS <br /> • MW-5-WD-080717 MSD <br /> Groundwater samples were analyzed for one or more of the following analyses: <br /> • TPH quantified as diesel(TPHd), carbon range C,o-C25,by EPA Method SW8015B modified; a <br /> silica gel-cleanup procedure based on EPA Method SW3630 was also performed on samples with <br /> TPHd detections to remove non-target biogenic compounds <br /> • Polynuclear aromatic hydrocarbons(PAHs)by EPA Method SW8270C with selected ion <br /> monitoring(SW8270C-SIM) <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,April 2007; <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. For contaminant delineation decision- <br /> making, soil and groundwater laboratory analytical results were compared to"action levels,"or levels <br /> above which further evaluation to define the extent of contamination is appropriate. <br />