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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 4 <br /> 4D— Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> 1455 McDowell 9lvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> Blayne Tech Services Client Project ID Chevron 9-86321980810-T2 <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Fran Thle QC Sample Group 9808853-05 Reported Aug 31, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid — <br /> Method EPA 801 S <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch # GC0824988TEX21 A <br /> Sample No GW9808761-02 <br /> Date Prepared 8/24198 <br /> Date Analyzed 8124198 <br /> Instrument 1 D # GCHP21 <br /> Sample Cone ug/L N D <br /> Cone Spiked uglL 250 <br /> Matrix Spike ug/L 260 <br /> % Recovery 104 <br /> Matrix <br /> Spike Duplicate ug/L 260 <br /> % Recovery 104 <br /> Relative % Difference 0 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS082498A <br /> Date Prepared 8/24/98 <br /> Date Analyzed 8124198 <br /> Instrument I D # GCHP21 <br /> Corte Spiked ug/L 250 <br /> LCS Recovery ug/L 220 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> F— Lcs 70 130 <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 interferers free matrix that is analyzed using the same reagents <br /> "EQUO^ YTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sampfe <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> i 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 /> F/ gory <br /> r I t Manager <br />