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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (654)364-9600 FAX(650) 364-9233 <br /> 404 N WISet lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-%73 <br /> ,!D <br /> Analytical 819 Striker Avenue suite <br /> a Sacramento.CA 95834 (416)921-9600 FAX(915)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industnal Road Sart Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Delta Environmental Client Project ID Exxon 7-3708, D090-809 <br /> 3164 Gold Camp Drive, #200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell QC Sample Group 9903428-02 04-09 Reported Mar 18 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst PETER ALCALA <br /> ANALYTE Gasoline <br /> QC Batch # GCO31 599BTEX31 A <br /> Sample No GW9903428-1 <br /> Date Prepared 3115/99 <br /> Date Analyzed 3/15199 <br /> Instrument I D # GCHP31 <br /> Sample Conc uglL N D <br /> Conc Spiked ug1L 250 <br /> Matrix Spike uglL 210 <br /> % Recovery 84 <br /> Matrix <br /> Spike Duplicate uglL 230 <br /> % Recovery 92 <br /> Relative % Difference 9 1 <br /> I <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC031599BTEX31A <br /> Date Prepared 3115199 <br /> Date Analyzed 3115199 <br /> Instrument I D # GCHP31 <br /> Conc Spiked uglL 250 <br /> LCS Recovery, uglL 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> F- <br /> ms/MSD 60140 <br /> 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 mterterent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL 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 matnx 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 /> David A Pichette <br /> Project Manager <br /> `6cY <br />