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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N WiSet Lane Walnut Creek CA 94598 (510) 968 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 311-174 1A/BP #5447, Stockton <br />' 2025 Gateway Place, Suite 440 Matrix Solid <br /> San Jose, CA 95110 <br /> Attention Joe Muzzio Work Order# 9802686 01-12 Reported Feb 27, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22498BTEXEXB G0022498BTEXEXB GCO22498BTEXEXB GCO22498BTEXF-XB GCO22498BTEXEXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 503D EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br />' MS/MSD# 9802BB608 9802B8608 9802B8608 9802B8608 9802B8608 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/24/98 2/24/98 2/24/98 2/24/98 2/24/98 <br /> Analyzed Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <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 010 014 014 044 090 <br /> MS % Recovery 50 70 70 73 75 <br /> Dup Result 014 015 014 046 1 0 <br /> MSD % Recov 70 85 70 77 83 <br /> RPD 33 69 00 44 11 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK022498 BLK022498 BLK022498 BLK022498 BLK022498 <br /> Prepared Date 2/24/98 2/24/96 2/24/98 2/24/98 2/24/98 <br /> Analyzed Date 2/24/98 2/24/98 2/24/98 2/24/98 2/24/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <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 017 017 018 054 11 <br /> LCS % Recov 85 85 90 90 92 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 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 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 9802B86 PPP ¢1> <br />