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s <br /> Sequoia 680 Chesapeake Drove Redwood Clry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wig,!, Lane Walnut Creek CA 94598 (9z5)988 9600 FAX(925)988 9673 <br /> IWO Analytlea 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 /> DELTA ENVIRONMENTAL Client Project 10 EXXON 7 3708 D093 809 <br /> 3164. Gnlrf Camp Dr , f1700 <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell QC Sample Group 9810472 Reported Oct 14 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC100898BTEX17A <br /> Sample No GW9809H47-4 <br /> Date Prepared 1018198 1018198 10/8196 1018198 <br /> Date Analyzed 1018198 1018198 1018198 1018198 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 11 11 12 33 <br /> % Recovery 110 110 120 110 <br /> Matrix <br /> Spike Duplicate ug[L 11 11 12 33 <br /> % Recovery 110 110 120 71a <br /> Relative % Difference 0 0 0 0 00 0 0 <br /> RPD Control Limits 0-25 0 25 0 25 0 25 <br /> LCS Batch# GWLCS100898A <br /> Date Prepared 1018/98 1018/98 1018/98 10/8/98 <br /> Date Analyzed 10/8198 1018198 10/8/98 10/8198 <br /> Instrument I D # GCHP17 GCHP1 7 GCHP1 7 GCHP17 <br /> Conc Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L 11 11 11 32 <br /> LCS % Recovery 110 110 110 107 <br /> Percent Recovery Control Limits <br /> MS/MS0 50 140 60140 60140 60 140 <br /> LCS 70 130 70 130 70130 70 130 <br /> Duality Assurance Statement Ali standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known tnterferent free matrix that is analyzed using the same reagents <br /> SEQUOIA N LYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of spectfic compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control Simrts due to matrix <br /> Mei Met Shin interference the LCS recover is to be used to validate the batch <br /> Project Manager <br />