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i <br /> Seuoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> a�_ 404 <br /> N W�get 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 ]D 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# 9802B86 01-12 Reported Feb 27, 1998 <br />' QUALITY CONTROL DATA REPORT <br />' Analyte Diesel MTBE MTBE <br /> QC Batch# GCO218980HBPEXC MS022098MTBEEXA MS021998MTBEEXB <br /> Analy Method EPA 8015M EPA 8260 EPA 8260 <br />' Prep Method EPA 3550/DHS N A. N A <br /> Analyst G Fish L Duong L Duong <br />' MS/MSD# 980297503 9802138607 9802A2601 <br /> Sample Cone N D N D N D <br /> Prepared Date 2/18/98 2/20/98 2/19/98 <br /> Analyzed Date 2/19/98 2/23/98 2/1x/98 <br />' Instrument I D # GCHPI9A H6 H6 <br /> Cone Spiked 25 mg/Kg 2500 ug/Kg 2500 mg/Kg <br /> Result 17 231G 2000 <br /> 92 <br /> MS % Recovery 68 s2 so <br /> Dup Result 18 2510 1850 <br />' MSD % Recov 72 100 74 <br /> RPD 57 83 78 <br /> RPD Limit 0-50 0-25 0-25 <br />' LCS # BLK021998 LCS022398 BLK022098 <br /> Prepared Date 2/19/98 2/23/96 2/20/98 <br /> Analyzed Date 2/21/98 2/24/98 2/20/98 <br />' Instrument I D # GCHPI9B F3 H6 <br /> Cone Spiked 25 mg/Kg 2500 mg/Kg 2500 ug/Kg <br /> LCS Result 19 2000 2400 <br />' LCS % Recov 76 so 96 <br />' 50-150 60-140 60.140 <br /> LCS 60-140 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 speolfled 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 <3> <br />