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<r �' 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 %00 FAX(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 45834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)79Z-0342 <br /> Blaine Tech Services Client Project ID Chevron 9-82641980810-T1 <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Fran Thie QC Sample Group 9808910-01-03,05 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 # C3CO82098BTEX02A <br /> Sample No GW9808731-08 <br /> Date Prepared 8120/98 8120198 8120198 8/20198 <br /> Date Analyzed 8120198 8120/98 8120198 8120/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 13 11 11 36 <br /> % Recovery 130 110 110 120 <br /> Matrix <br /> Spike Duplicate ug]L 12 11 11 34 <br /> % Recovery 120 110 110 113 <br /> Relative % Difference 8 0 00 0 0 6 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS082098A <br /> Date Prepared 8120198 8120198 8120198 8!20198 <br /> Date Analyzed 8/20198 8120/98 8120198 8120198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L. 10 10 10 32 <br /> LCS % Recovery 100 100 100 107 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 60140 60140 60 140 60 140 <br /> LCS 70 130 70130 70130 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 interferent free matrix that is analyzed using the same reagents <br /> IsSEQUOIA A YTICAL 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 limas due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Ory <br /> r ) onager <br />