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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wlset Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Anaytica 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)92.1-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-034Z <br /> ej <br /> ATC Associates, Inc Client Project ID Stockton Fire#2 62574 0001102 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9809G80-01-03 Reported Oct 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N C <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC092998BTEX03A <br /> Sample No GW9809943-2 <br /> Date Prepared 9129198 9/29198 9/29198 9129/98 <br /> Date Analyzed 9/29198 9/29198 9/29198 9129198 <br /> Instrument i D # GCHP03 GCHP03 GCHP03 GCHP03 <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 95 94 96 29 <br /> 0/6 Recovery 95 94 96 97 <br /> Matrix <br /> Spike Duplicate, ug/L 89 8 7 8 8 27 <br /> % Recovery 89 87 88 90 <br /> Relative % Difference 6 5 7 7 8 7 7 5 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS092998A <br /> Date Prepared 9129/98 9129198 9129198 9129198 <br /> Date Analyzed 9129198 9129198 9/29196 9/29198 <br /> Instrument 1 D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 10 10 11 32 <br /> LCS % Recovery 100 100 110 107 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <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 Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> c ` <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes frim the matrix spike does not tall within specified control limas due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Ka imyai <br /> Project Manag <br /> �StY <br />