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t+ 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) 968 9600 FAX(510)988 9673 <br /> Analytical 819$taker 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 03, 04 Reported Feb 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21596BTEX20A GCO21596BTEX20A GCO21596BTEX20A GCO21596BTEX20A <br /> Analy Method EPA 6020 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 # 950237303 950237303 950237303 950237303 <br /> Sample Conc N D N D N D N D <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 I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 fig/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 98 9 9 96 30 <br /> MS % Recovery 98 99 96 100 <br /> Dup Result 10 10 10 31 <br /> MSD % Recov 100 100 100 103 <br /> RPD 20 10 41 33 <br /> RPD Limit 0-50 0-50 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 I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10ug/L 10ug/L 10fug/L 30ug/L <br /> LCS Result 10 99 96 30 <br /> LCS % Recov 100 99 96 100 <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 /> 0 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 /> a 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 9602859 PPP <3> <br />