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Sequoia 680 Chesapeake Drivc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite E Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> I <br /> Ground Zero Analysis, Inc Client Project ID 96-163, Knowles Roek <br /> 1714 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Greg Stahl Work Order# 9803103-03 Reported Apr 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC032898STEX03A GC032898BTEX03A GCO32896BTEX03A GCO32898BTEX03A GC032898BTEX03A <br /> Analy Method EPA 8020 EPA 8020 EFA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EFA 5030 EPA 5030 EPA 5030 <br /> Analyst C DeMartim C De Martini C DeMart:ni C DeMartlni C DBMartini <br /> MS/MSD# 9803G3201 980363201 9BC3G3201 980363201 980363201 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/28/98 3/28/98 3,28/98 3/28/98 3/25/98 <br /> Analyzed Date 3/28/98 3/28/98 3128/98 3/28/98 3/28/98 <br /> Instrument 1 D # GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10 pg/L 10pg/L to pg/L 30 jig/L 60 pg/L <br /> Result 10 11 11 32 62 <br /> MS % Recovery 100 110 110 107 103 <br /> Dup Result 10 11 11 33 63 <br /> MSD % Recov 100 110 110 110 105 <br /> RPD 00 00 00 31 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK032898 BLK032898 BLK032898 BLK032898 BLK032898 <br /> Prepared Date 3/28/98 3/28/98 3128/98 3/28/98 3/28/98 <br /> Analyzed Date 3/28/98 3/28/98 328/98 3/28/98 3/28/98 <br /> Instrument I D# GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10 pg/L 10 ug/L 10 pg/L 30 frg/L 60 p9/1- <br /> LCS <br /> 9/LLCS Result 10 11 11 32 62 <br /> LCS % Recov 100 110 110 107 103 <br /> 60140 60-140 60-140 60-140 60-140 <br /> LCS 70-330 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents <br /> �S I YTICAL 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 P <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 /> Peg��P <br /> Prole t a ger **MS=Matrix Spike MSD=VIS Duplicate,RPD=Relative%Difference 9803103 GGG <2> <br />