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(Y r� Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 320-159 1A/9-1452, Ripon <br /> 2025 Gateway Place, Suite 440 Matrix LIQUID <br /> San Jose, CA 95110 <br /> Attention Mark Sullivan Work Order# 9602869 01, 02 Reported Feb 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21596BTEX21A GCO21596BTEX21A GCO21596BTEX21A GCO21596BTEX21A <br /> Analy 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/MSD# 960237303 960237303 960237303 960237303 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 2/15/95 2/15/96 2/15/96 2/15/96 <br /> Analyzed Date 2/15/96 2/15/96 2/15/96 2/15/96 <br /> Instrument LD # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10,ug/L 10ug/L 10yg/L 30Ng/L <br /> Result 11 11 10 30 <br /> MS %Recovery 110 110 100 100 <br /> Dup Result 93 8 9 82 23 <br /> MSD % Recov 93 89 82 77 <br /> RPD 17 21 20 26 <br /> RPD Limit 0-50 D-50 0-50 0-50 <br /> LCS# BLK021596 BLK021596 BLK021596 BLK021596 <br /> Prepared Date 2/15/96 2/15/96 2/15/96 2/15/96 <br /> Analyzed Date 2/15/96 2/15/96 2/15/96 2/15/96 <br /> Instrument LD# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10 ug/L 10 Pg/L 10 pg/L 30 Ng/L <br /> LCS Result 99 8 7 73 21 <br /> LCS % Recov. 99 87 73 70 <br /> LCS 70-130 7D-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 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 /> A1� 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 /> Claudia Hirotsu <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9602869 PPP <2> <br />