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Sequoia680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> r 1- 404 N W-get Lane Walnut Creek CA 94598 (510) 998 9600 FAX(5 to)988%73 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Ground Zero Analysis, Inc Client Project ID 95-163 Knowles Roek <br /> 1714 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Justin Powers Work Order # 9803929 -01 Reported Apr 1, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC031998BTEX02-A GC031998BTEX02A GC031998BTEX02A GCO31998BTEX02A GC031998BTEX02A <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 C De Martini C DeMartlnl C DeMartinl C DeMartlnl C DeMartlnl <br /> MS/MSD# 980358402 980358402 980358402 980358402 980358402 <br /> Sample Conc N D ND N D N D N D <br /> Prepared Date 3/19/98 3/19/98 3/'9/98 3/19/98 3/19/98 <br /> Analyzed Date 3/19/98 3/19/98 3/19/98 3/19/98 3/19/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10kg/L loug/L 10ug/L 30Ng/L 60Ng/L <br /> Result 10 10 11 33 65 <br /> MS % Recovery 100 100 110 110 108 <br /> Dup Result 10 10 11 33 65 <br /> MSD % Recov 100 100 110 110 108 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0 25 025 025 0-25 0-25 <br /> LCS# BLK031998 BLK031998 BLK031998 BLK031998 BLK031998 <br /> Prepared Date 3,19/98 3119/98 3/19/98 3/19/98 3/19/98 <br /> Analyzed Date 3/19/98 3/19/98 3/19/98 3/19/98 3/19/98 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10ug/L 10ug L 10-ig/L 30pg/L 60ug/L <br /> LCS result 10 10 11 34 65 <br /> LCS % Recov 100 100 110 113 108 <br /> 60-140 60-140 60140 60140 60140 <br /> LCS 70130 70-130 70130 70130 70130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known interferent-free matrix that is analyzed using the same reagents <br /> $ I AN LYTICAL 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> P gg nner <br /> P t Manager **MS=Matrix Spike MSD=MS Duplicate RPD=Relative 90 Difference 9803929 GGG <1> <br />