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r <br /> LW <br /> Sequoia 610 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-%00 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)92t-9600 FAX(9f6)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> fL ATC Associates, Inc. Client Project 1D: Rosettis Market <br /> 1260 Graphics Drive <br /> • Modesto, CA 95351-1502 <br /> Attention: Jeanne Homsey QC Sample Group: 9807057-01-06, -08 Reported: Jul 10, 1998 <br /> IV <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Solid <br /> Method: EPA 8020 <br /> F Analyst: G. PESHINA <br /> il..r <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch#: GC070298BTEXEXB <br /> Sample No.: GS986H87-1 <br /> Date Prepared: 712198 712198 712198 712198 <br /> Date Analyzed: 7/6/98 7/6198 716198 718198 <br /> fi.. Instrument I.D.#: GCHP7 GCHP7 GCHP7 GCHP7 <br /> Sample Cone., mg/Kg: N.D. N.D. N,D, N.D. <br /> Conc. Spiked, mg/Kg: 0.20 0.20 0.20 0.60 <br /> LW <br /> Matrix Spike, mg/Kg: 0.17 0.17 0.17 0.51 <br /> % Recovery: 85 85 85 85 <br /> fr. Matrix <br /> Spike Duplicate, mg/Kg: 0.18 0.18 0.18 0.54 <br /> % Recovery: 90 90 90 90 <br /> ftr <br /> Relative % Difference: 5.7 5.7 5.7 5.7 <br /> * RPD Control Limits: 0-25 0-25 0-25 0-25 <br /> LCS Batch#: GSBLK070698B <br /> 4 <br /> Date Prepared: 712198 7/2198 712198 712198 <br /> Date Analyzed: 716198 7/6/98 716198 716198 <br /> ' Instrument I.D.#: GCHP7 GCHP7 GCHP7 GCHP7 <br /> �... Cone. Spiked, mg/Kg: 0.20 0.20 0.20 0.60 <br /> Recovery, mg/Kg: 0.19 0.19 0.18 0.56 <br /> L LCS % Recovery: 95 96 90 93 <br /> Percent Recovery Control Limits: <br /> F- <br /> MStMSD 60-140 60-140 60-140 60-140 <br /> fr.. LCS 70-130 70.130 70-130 70-130 <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> Please Note: <br /> Lo 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 /> ( 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 /> Ka n Kimyai <br /> Project Manager <br /> r <br /> V <br />