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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650 3 <br /> 1 404 N % et[ane ) 64-9600 FAX(650)364 9233 <br /> S Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)92f 0100 <br /> ' 1455 McDowell Blvd North Ste D f etaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> Groundsis, InrClient Prolact ID 96-1fi3, Knowles Rock <br /> 0owers QC Sample Group 9808C27-01 <br /> Repo(tpd Auy 31, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Method EPA 8015 <br /> Analyst AM <br /> ANALYTE Gasoline <br /> QC Batch # GCO82298BTEX21A <br /> ' Sample No GW980SA87 04 <br /> Date Prepared 8/22/98 <br /> ' Date Analyzed 8/22198 <br /> Instrument I D # GCHP21 <br /> Sample Conc , ug/L N D <br /> ' Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 220 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate ug/L 240 <br /> % Recovery 96 <br /> ' Relative % Difference 8 7 <br /> ' RPD Control Limits 025 <br /> ' LCS Batch# GWLCS082298A <br /> Date Prepared 8/22/98 <br /> Date Analyzed 8/22198 <br /> ' Instrument I D # GCHP21 <br /> Conc Spiked, ug/L 250 <br /> ' LCS Recovery, ug/L 230 <br /> LCS % Recovery 92 <br /> Percent Recovery Control Limits <br /> ' MS/MSD 60140 <br /> LCS 70 730 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> ' Please Note <br /> SEQU The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> ANALYTIC preparation and analytical methods employed for the samples The matrix spike is an alr <br /> fortified with known quaniit es of specific compounds and subjected to the entire analytical procedure ot of le 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 /> R ,uc <br /> Tom <br /> Project Manage <br />