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' Sequoia 680 Chesapeake Drive Redwood 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 /> Enviros Client Project ID 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 Phenol 2-Chlorophenol 1,4-Dlchloro- N-Nitroso-Di- <br /> benzene N-propylamine <br /> QC Batch# MS0410978270EXA Ms0410978270EXA Ms0410978270EXA Ms0410978270EXA <br /> Analy Method' EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method. EPA 3510 EPA 3510 EPA 3510 EPA 3510 <br /> Analyst E Manuel E Manuel E Manuel E Manuel <br /> MS/MSD#. BLK041097 BLK041097 BLK041097 BLK041097 <br /> Sample Conc ' N D ND N D N D <br /> Prepared Date 4/10/97 4/10/97 4/10/97 4/10/97 <br /> Analyzed Date 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Instrument I D # F4 F4 F4 F4 <br /> Cone Spiked 200 pg/L 200 Ng/L 200 pg/L 200 fig/L <br /> Result' 83 140 120 140 <br /> MS % Recovery 42 70 60 70 <br /> Dup Result 71 140 120 140 <br /> MSD % Recov.' 36 70 80 70 <br /> RPD 16 00 00 00 <br /> RPD Limit' 0-30 0-30 0-30 0-30 <br /> LCS#. WB041697BS WB041697BS W8041697BS WB041697BS <br /> Prepared Date. 4/16/97 4/16/97 4/16/97 4/16/97 <br /> Analyzed Date, 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument 1.13 #: F4 F4 F4 F4 <br /> Conc.Spiked' 200 yg/L 200 Ng/L 200 ug/L 200 pg/L <br /> LCS Result* 88 150 120 110 <br /> LCS %Recov 44 75 60 55 <br /> i MS/MSD <br /> LCS <br /> Control Limits 12-110 27-123 36-97 41-116 <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 /> I regory **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager Page 1 of 3 9704512 EEE <12> <br />