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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)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Thiernann's Service 62605 0001 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9807440 -01-06 Reported Jul 17, 1998 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC071398802007A GC071398802007A GC071398802007A GCO71398802007A GC071398802007A <br /> Analy. Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst S L S L S L S L S L <br /> MS/MSD# 98070223 98070223 98070223 98070223 - <br /> Sample Cone N D N D N D N D <br /> Prepared Date 7/13/98 7/13/98 7/13/98 7/13/98 <br /> Analyzed Date 7/13/98 7/13/98 7/13/98 7/13/98 <br /> Instrument LD # GC7 GG7 GC7 GC7 <br /> Cone. Spiked 20 pg/L 20 pg/L 20 pg/L 60]Ug/L <br /> Result 17 18 18 57 - <br />• MS % Recovery 84 88 92 95 Y <br /> Dup Result 18 19 20 61 <br /> MSD% Recov 90 93 99 101 <br /> RPD 57 54 105 68 - <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS# LCS071398 LCS071398 LCS071398 LCS071398 LCS071398 <br /> Prepared Date 7/13/98 7/13/98 7/13/98 7/13/98 7/13/98 <br /> Analyzed Date 7/13/98 7/13/98 7/13/98 7/13/98 7/13/98 <br /> Instrument I D # GC7 GC7 GC7 GC7 GC7 <br /> Cone Spiked 20 erg/L 20 ug/L 20 Ng/L 60 pg/L 500,ug/L <br /> LCS Result 17 18 19 58 404 <br /> LCS% Recov 85 88 94 97 81 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent4res matrix that is analyzed using the same reagents, <br /> Elap#2142 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 /> anKirua <br /> rolect Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9807440 AAA <t> <br /> 4 <br />