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u'f h irk <br /> Sequoia 680 Chesapeake Drive Redwood GA (650) 364- 00 FAX(650) 364-9233 <br /> 404 1\I VHiget Lane Walnut Creekk CA 945984598 (925)988-96%00 FAX(925)98$-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Westrec ProperlKlR 62514 0001 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9903268 02,06,07 Reported Mar 24, 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 # GC031 799BTEX03A <br /> Sample No GW9903286-2MS <br /> Date Prepared 3!17199 3117199 3117199 3!17199 <br /> Date Analyzed 3117199 3117199 3/17/99 3117199 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone , uglL N D N D N D N D <br /> Cone Spiked ug1L 10 10 10 30 <br /> Matrix Spike uglL 9 6 9 3 9 3 28 <br /> % Recovery 96 93 93 94 <br /> iMatrix <br /> Spike Duplicate uglL 94 9 1 92 28 <br /> % Recovery 94 91 92 93 <br /> Relative % Difference 2 1 22 1 1 1 1 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS031799A <br /> Date Prepared 3117199 3117199 3117199 3117199 <br /> Date Analyzed 3117199 3117199 3117199 3117199 <br /> Instrument 1 D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked, uglL 10 10 10 30 <br /> LCS Recovery, uglL 9 7 10 10 31 <br /> LCS % Recovery 97 102 103 104 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60 140 <br /> LCS 70130 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 some reagents <br /> . SEQUOIA 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 It <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 /> Kayv <br /> Prolect Manager <br />