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APPENDIX E: <br /> DATA USABILITY SUMMARY <br /> INTRODUCTION <br /> SAIC evaluated the analytical data for soil and water samples collected at the US Can—Welty <br /> Road site in Vernalis, California. This data usability summary presents the results of the data <br /> validation process. SAIC collected environmental samples on behalf of Chevron Environmental <br /> Management Company to delineate the lateral and vertical extent of petroleum-affected soil and <br /> water. Soil, groundwater, and water-matrix quality control (QC) samples were collected during <br /> three separate field events: August 11 —August 18, 2008;November 17—November 25, 2008; <br /> and March 3 —March 5, 2009. The total number of samples collected was as follows: <br /> • Fifty-eight soil samples <br /> • Sixteen groundwater samples <br /> • Three groundwater field duplicate samples <br /> • Three groundwater matrix spike/matrix spike duplicate (MS/MSD) samples <br /> • Nine water-matrix trip blank samples <br /> • Six water-matrix equipment rinsate blanks <br /> • Two water-matrix field blank samples <br /> Lancaster Laboratories, Inc. (Lancaster)performed all the analyses on the samples. Lancaster is <br /> certified by the State of California through the Department of Health Services to perform <br /> environmental analyses. <br /> Soil samples were analyzed for the following constituents of potential concern (COPCs): <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX)by United States <br /> Environmental Protection Agency(EPA)Method SW8260B. <br /> • Total petroleum hydrocarbons quantified as crude oil (TPHc), carbon range CIO-C36, by <br /> EPA Method SW8015 modified. <br /> • Polynuclear aromatic hydrocarbons (PAHs) by EPA Method SW8270C with selective ion <br /> monitoring. <br /> Groundwater and water-matrix samples were analyzed for one or more of the following COPCs: <br /> • BTEX by EPA Method SW8260B. <br /> • PAHs by EPA Method SW8270C with large-volume injection. <br /> • TPH quantified as diesel (TPHd), carbon range C10-C25, by EPA Method SW8015 <br /> modified; a silica gel clean-up procedure based on EPA Method SW3630 was also <br /> performed on samples with TPHd detections to remove non-target biogenic compounds. <br /> • Alkalinity,bicarbonate, and carbonate by Standard Method(SM) 20 2320 B. <br /> • Ammonia nitrogen by SM20 4500NH3 B/C modified. <br /> • Chloride, sulfate, nitrite, and nitrate nitrogen by EPA Method 300.0. <br /> E.1-1 <br /> From Science to Snlutiens <br />