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4D- <br /> Sequoia 680Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-%00 FIV((925)988-9673 <br /> .�,,, Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9604 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-86321980810-T2 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9808853-01 Reported Aug 31 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC082098BTEX17A <br /> Sample No GW9808731-01 <br /> Date Prepared 8120198 8120/98 8/20198 8120198 <br /> Date Analyzed 8120198 8120198 8120198 8/20198 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Sample Cone ug/L N D N D N D N D <br /> Cone Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 10 9 9 10 29 <br /> % Recovery 100 99 100 97 <br /> Matrix <br /> Spike Duplicate ug/L 11 10 10 30 <br /> % Recovery 110 100 100 100 <br /> Relative % Difference 9 5 1 0 0 0 3 0 <br /> RPD Control Limits 0-25 0-25 025 025 <br /> LCS Batch# GWLCS082098A <br /> Date Prepared 8120198 8/20/98 8/20198 8/20198 <br /> Date Analyzed 8/20/98 8/20198 8120198 8/20/98 <br /> Instrument i D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery, uglL 10 10 10 32 <br /> LCS % Recovery 100 100 100 107 <br /> Percent Recovery Control Limits <br /> F- MSIMSD 60140 60 140 60140 60140 <br /> LCS 70130 70130 70130 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 interferent free matrix that is analyzed using the same reagents <br /> QUO A LYTICAL 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 /> nterference the LCS recovery rs to be used to validate the batch <br /> egory <br /> t Manager <br />