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Sequoia 680 Chesapeake Drive Redwood CityCA 94063 (650) 364-9600 FAX (650) 364 9233 <br /> 404 f+i Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> ,!D— Analyt Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (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 /> 16 <br /> Delta Environmental Client Project ID Exxon 7-3708 D093-809 <br /> 3164 Gold rgrr p D"V e, tr2nn <br /> Rancho Cordova CA 95670 <br /> Attention ,elm Brownell QC Sample Group 9807152-01 03 Reported Jul 14 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst N Herrera <br /> ANALYTE Gasoline <br /> QC Batch # GCC709986TEX21A <br /> Sample No GW9807009-1 <br /> Date Prepared 7/9198 <br /> Date Analyzed 7/9198 <br /> Instrument I D # GCHP21 <br /> Sample Conc ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 200 <br /> % Recovery 78 <br /> Matrix <br /> Spike Duplicate ug/L 190 <br /> % Recovery 75 <br /> Relative % Difference 3 9 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWBLK070998AS <br /> Date Prepared 719198 <br /> Date Analyzed 719198 <br /> Instrument I D # GCHP21 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery ug/L 210 <br /> LCS % Recovery 83 <br /> Percent Recovery Control Limits <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 interferent free matrix that is analyzed using the same reagents <br /> I 11A 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 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 /> Richard Herling <br /> Project Manager <br />