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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 /> Envlros Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention ,Joe Neely Work Order# 9704512 04, 05 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# MSO414978720EXA MSO414978720EXA MSO414978720EXA MSO414978720EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep. Method: EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst, E Manuel E Manuel E Manuel E Manuel <br /> MS/MSD #- 970474404 970474404 970474404 970474404 <br /> Sample Cone N D N D N D N D <br /> Prepared Date: 4/14/97 4/14/97 4/14/97 4/14/97 <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. 3300{.x9/K9 3300 pg/Kg 3300 pg/Kg 3300 pg/Kg <br /> Result, 2300 2200 850 2200 <br /> MS%Recovery. 70 67 26 67 <br /> Dup Result 2400 2400 1000 2500 <br /> MSD % Recov : 73 73 30 76 <br /> RPD. 42 87 16 8 5 <br /> RPD Limit- 0-40 0-40 0-40 0-40 <br /> LCS #: SB041797BS SB041797BS SB041797BS SB041797BS <br /> Prepared Date 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date* 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument 1 D #' F4 F4 F4 F4 <br /> Conc Spiked: 3300 pg/Kg 3300pg/Kg 3300 pg/Kg 3300 pg/Kg <br /> LCS Result. 2500 2400 2000 2300 <br /> LCS % Recov. 76 73 61 70 <br /> LCS <br /> Control Limits 26-90 25-102 28-104 28-104 <br /> Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> SEQUOIA PALYTICAL 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 Gregory ""MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager Page 1 of 3 9704512 EEE <6> <br />