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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> (i) 404 N Wiset 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 /> Enviros Client Project lD Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 10 Reported Apr 22, 1997 <br /> {QUALITY CONTROL DATA REPORT <br /> Analyte 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# Ms0410978270EXA Ms0410978270EXA Ms0410978270E)(A <br /> Analy. Method. EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method. EPA3510 EPA3510 EPA 3510 <br /> Analyst E Manuel E Manuel E Manuel <br /> MS/MSD #: BLK041097 BLK041097 BLK041097 <br /> Sample Cone • N D ND ND <br /> Prepared Date 4/10/97 4/10/97 4/10/97 <br /> Analyzed Date 4/15/97 4/15/97 4/15/97 <br /> Instrument LD #. F4 F4 F4 <br /> Cone Spiked- 200,ug/L 200,ug/L 200 jug/L <br /> Result 170 150 130 <br /> MS% Recovery 85 75 65 <br /> Dup Result 160 140 130 <br /> MSD % Recov 80 70 65 <br /> RPD 61 69 00 <br /> RPD Limit 0-30 0-30 0-30 <br /> LCS #. WB041697BS WB041697BS WB041697BS <br /> Prepared Date 4/16/97 4/16/97 4/16/97 <br /> Analyzed Date 4/17/97 4/17/97 4/17/97 <br /> Instrument I D.# F4 F4 F4 <br /> Cone Spiked 200 ug/L 200 pg/L 200pg/L <br /> LCS Result 150 100 140 <br /> LCS % Recov 75 50 70 <br /> LCS <br /> Control Limits 24-95 9-103 26-127 <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 /> 1eregory **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9704512 EEE 414> <br />