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15) <br /> Sequoia 680 Chesapeake Drive Rcdwood 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 /> Pacrflc 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# 9607569 01, 02 Reported Jul 18, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC071296BTEX17A GC071296STEX17A GC071296BTEX17A GCO71296BT©C17A <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# 960704902 960704902 960704902 960704902 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 7/12/96 7/12/96 7/12/96 7/12/96 <br /> Analyzed Date 7/12/96 7/12/96 7/12/96 7/12/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked 10 pg/L 10 ug/L 10 erg/L 30 Ng/L <br /> Result 99 10 10 30 <br /> MS % Recovery 99 100 100 100 <br /> Dup Result 92 91 92 28 <br /> MSD % Recov 92 91 92 93 <br /> RPD 73 94 83 69 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK071296 BLK071296 BLK071296 BLK071296 <br /> Prepared Date 7/12/96 7/12/96 7/12/96 7/12/96 <br /> Analyzed Date 7/12/96 7/12/96 7/12/96 7/12/96 <br /> Instrument I D #- GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10ug/L 10Ng/L 10yg/L 30frg/L <br /> LCS Result 10 10 10 31 <br /> LCS % Recov 100 100 100 103 <br /> 60-140 60.140 60.140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LGS 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 /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Claudia Hlrotsu interference,the LCS recovery Is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9607569 PPP Z I> <br />