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,I <br /> ` A , <br /> Sequoia 680 Chesapeake Drive Redwood City CA 44463 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 486 9600 FAX (S10) 986 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 Oi00 <br /> i <br /> Pacific Environmental Group Client Project ID 911-007 1A/5417, Manteca <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br /> San Jose, CA 95110 <br /> Attention Joe Muzzio Work Order# 9801861 01 Reported Jan 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO12098BTEXF-XB GC012098BTEXEXB GC012098BTEXEXB GC012098BTEXEXB GC012098BTEXEXB <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 DeMartinr C DeMartinl C DeMartini C DeMartlni C DeMartinl <br /> MS/MSD #. 980176937 980176937 980176937 980176537 980176937 <br /> Sample Conc - N D N D N D N D N D <br /> Prepared Date 1/20/98 1/20/98 1/20/98 1/20/98 1/20/98 <br /> Analyzed Date 1/21/98 1/21/98 1/21/98 1/21/98 1/21/98 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 017 018 019 056 11 <br /> MS % Recovery 85 90 95 93 11 <br /> Dup Result 017 019 019 056 12 <br /> MSD % Recov 85 85 95 93 100 <br /> RPD 00 54 00 00 87 <br /> RPD Limit 0-25 0.25 0-25 0-25 0.25 <br /> LCS # BLK012098 BLK012098 BLK012098 BLK012098 BLK012098 <br /> Prepared Date 1/20/98 1/20/98 1/20/98 1/20/98 1/20/98 <br /> Analyzed Date 1/21/98 1/21/98 1/21/98 1/21/98 1/21/98 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 018 019 020 058 1 3 <br /> LCS % Recov 90 95 100 97 108 <br /> 6014D 60-140 6D-140 6D-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br />. The LCS 1s 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative %Difference 9801861 PPP c1> <br /> — <br />