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s � <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Stock Fire Stat #2 62574 0001 <br /> 1 117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9812F36-01 Reported Jan 11, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO10599BTEX02A <br /> Sample No GW9812G54-09MS <br /> Date Prepared 115199 115199 115199 115199 <br /> Date Analyzed 115199 115199 115199 115199 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug/l. N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike ug/L 10 1 1 1 1 34 <br /> • °/a Recovery 103 113 110 112 <br /> Matrix <br /> Spike Duplicate uglL 9 6 10 10 31 <br /> % Recovery 96 105 r 105 103 <br /> Relative % Difference 7 0 7 3 47 84 <br /> RPD Control Limits 0 25 0-25 0-25 0-25 <br /> LCS Batch# GCO10599BTEX02A <br /> Date Prepared 115199 115199 115199 1/5199 <br /> Date Analyzed 115199 115199 115/99 115199 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 8 6 9 4 9 2 28 <br /> LCS % Recovery 86 r- 94 92 93 <br /> Percent Recovery Control Limits <br /> AAS/MSD 60 140 60140 60140 60140 <br /> LCS 70 130 70130 70130 70130 <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 /> �SEQLIOIA 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 fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> �ayvari Klmy�>,' <br /> Project Manager <br />