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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(6 50) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> loco Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(9t6)92t 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma, CA 94954 (707) 792 1865 FAX(707) 792 0342 <br /> Delta Environmental Client Project ID Exxon 7-3708 D093 809 <br /> 3164 Gold Camp Dr1VL, 41200 <br /> Rancho Cordova CA 95670 <br /> Attention Jim Brownell QC Sample Group 9812A76 Reported Jan 4 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Llquld <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC123098BTEX03A <br /> Sample No GW9812C82 1 <br /> Date Prepared 12/30/98 12130/98 12/30/98 12/30/98 <br /> Date Analyzed 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHPO3 <br /> Sample Conc ug/L N D N D N D N D <br /> Conic Spiked ug/L 10 10 10 30 <br /> Matrix Spike uglL 11 11 9 7 31 <br /> % Recovery 110 110 97 103 <br /> Matrix <br /> Spike Duplicate uglL 11 11 10 32 <br /> % Recovery 110 110 100 107 <br /> Relative % Difference 0 0 D D 3 0 3 8 <br /> RPO Control Limits 0 25 0 25 0 25 0 25 <br /> LCS Batch# GC123098BTEX03A <br /> Date Prepared 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Date Analyzed 12/30/98 12/30/98 12/30/98 12/30/98 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conic Spiked uglL 10 10 10 30 <br /> LCS Recovery uglL 11 11 9 5 30 <br /> LCS % Recovery 110 110 95 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60 140 60 140 60 140 60 140 <br /> LCS 70 130 70130 70130 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please(Vote <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br />,gWEQUOIA 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 /> R aid he <br /> Project Manager <br /> 17, <br />