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Sequoia 68D Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9133 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9I5)988-%00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-oto0 <br /> 1455 M[Dowefl Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Blaine Tech Services Client Project ID Chevron 9-427519$0624-J1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9806G63-02 Reported Jul 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst <br /> ANALYTE Gasoline <br /> QC Batch A` GCO70198STEX03A <br /> Sample No GW9806F55-1 <br /> Date Prepared 711198 <br /> Date Analyzed 711198 <br /> Instrument l D # GCHP03 <br /> Sample Conc ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 240 <br /> % Recovery 96 <br /> Matrix <br /> Spike Duplicate ug/L 250 <br /> % Recovery 100 <br /> Relative % Difference 4 1 <br /> RPD Control Limits 0 25 <br /> LCS Batch# GW070199AS <br /> Date Prepared 711198 <br /> Date Analyzed 711198 <br /> Instrument I D # GCHP03 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery, ug/L 220 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interierent tree matrix that is analyzed using the same reagents <br /> SEQUOIA A ALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> regory <br /> r ect Manager <br />