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6150Sequoia 00 O Chesapeake Drive Redwood City CA 94063 (650) 364-96FAX(650)364-9Z33 <br /> 4D404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(9Z5)988-%73 <br /> Analytical 819 Striker Avenue Suite s Sacramento 95834 (916)921-9400 FAX(916)921-0100 <br /> 1455 <br /> McDowell Aver be North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industnal Road San Carlos,CA 94070-4111 (550)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 9903428-01 03 Reported Mar 18 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst BTF <br /> ANALYTE Gasoline <br /> QC Batch # GCO31699BTEX02A <br /> Sample No GW9903171 1OMS <br /> Date Prepared 3116199 <br /> Date Analyzed 3116199 <br /> Instrument I D # GCHP02 <br /> Sample Cone ug/L <br /> Cone Spiked uglL 250 <br /> Matrix Spike ug/L 390 <br /> % Recovery 36 <br /> Matrix <br /> Spike Duplicate uglL 400 <br /> % Recovery 40 <br /> Relative % Difference 11 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS031699A <br /> Date Prepared 3/16199 <br /> Date Analyzed 3116199 <br /> Instrument I D # GCHP02 <br /> Cone Spiked uglL 250 <br /> LCS Recovery ug1L 240 <br /> LCS % Recovery 98 <br /> Percent Recovery Control Limits <br /> ms/mso 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 interferent free matnx 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 /> forohed with known quamtmesiof specific compounds and subjected to the enure analytical procedure 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 /> Ad�Achtte <br /> Project Manager <br />