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DATA USABILITY SUMMARY <br /> INTRODUCTION <br /> SAIC evaluated the analytical data for the following groundwater and water-matrix QC samples collected <br /> on January 23, 2007, at the US Can-Welty Road site in Vernalis, California: <br /> • QA-R-070123 (equipment rinsate blank) <br /> • MW-5-W-070123 <br /> • WFSMW-I-W-070123 <br /> • WFSMW-I-WD-070123 (field duplicate) <br /> Lancaster Laboratories performed all the analyses on the samples. All samples were analyzed for the <br /> following constituents: <br /> • Total petroleum hydrocarbons quantified as diesel-range organics (TPHd), carbon range Cio-C25, <br /> by U.S. Environmental Protection Agency(EPA)Method SW8015B; a silica gel-cleanup <br /> procedure based on EPA Method SW3630 was also performed on samples with TPHd detections <br /> to remove non-target biogenic compounds <br /> • Polynuclear aromatic hydrocarbons(PAHs)by EPA Method SW8270C with selected ion <br /> monitoring(SW8270C-SIM) <br /> Sample MW-5-W-070123 was also analyzed for the following general minerals analyses: <br /> • Calcium,boron, iron,magnesium,manganese,potassium, and sodium by EPA Method SW6010B <br /> • Total hardness by Standard Method(SM) 18 2340B <br /> • Alkalinity by SM 20 2320B <br /> • Total dissolved solids by EPA 160.1 <br /> • Kjeldahl nitrogen by EPA 351.2 <br /> • Ammonia as nitrogen by EPA 350.2 <br /> • Chloride,nitrate,nitrite, and sulfate by EPA 300.0 <br /> • Specific conductance by EPA 120.1 <br /> • Phosphate by EPA 365.1 <br /> • Bicarbonate and carbonate by SM 20 2320B <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 /> �U <br /> From Science to Solutions <br />