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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9690 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> fly Analytical 819 Striker Avenue Suitc 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 310-040 5A/2859, Stockton <br /> 2025 Gateway Place, Suite 440 <br /> San Jose, CA 95110 <br /> Attention Andrew Lehane Work Order# 9602836 01, 02 Reported Feb 16, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21496BTEX17A GCO21496BTEX17A GCO21496BTEX17A GCO21496BTEX17A <br /> Aria ly Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J woo J woo J woo <br /> MS/MBD# 960207712 960207712 960207712 960207712 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10ug/L 10Ng/L 10ug/L 30,ug/L <br /> Result 11 11 11 33 <br /> MS % Recovery 110 110 110 110 <br /> 0 Dup Result 12 12 12 36 <br /> MSD % Recov 120 120 120 120 <br /> RPD 87 87 87 87 <br /> RPD Limit 0-50 0.50 0-50 0-50 <br /> LCS # BLK021496 BLK021496 BLK021496 BLK021496 <br /> Prepared Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Analyzed Date 2/14/96 2/14/96 2/14/96 2/14/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 pg/L 10 pg/L 10,ug/L 30 ug/L <br /> LCS Result 12 11 11 34 <br /> LCS % Recov 120 110 110 113 <br /> LCS 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 is analyzed using the same reagents, <br /> •SEQUOIA ANALYTI L _ preparation,and analytical methods employed for the samples The matrix spike is an aliquot Of sample <br /> fortified with known quantities of specc compounds and subfected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to <br /> Claudia Hirotsu matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative %Difference 9602836 PPP <1> <br /> �' <br />