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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> Ci) 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 /> - <br /> `Enviros Client Project ID' Shell'Stockton <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 _ <br /> Attention J Gaarder Work Order# 9709C12-05 Reported Sep 30, 1997 <br /> S <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Beryllium Cadmium Chromium Nickel <br /> OC Batch#: ME092397601OMDE ME092397601OMDE ME092397601OMDE ME092397601OMDE <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst R Butler R Butler R Butler R Butler <br /> MS/MSD # 9709C5501 9709C5501 970905501 970905501 <br /> Sample Conc N D N D 40 35 <br /> Prepared Date 9/23/97 9/23/97 9/23/97 9/23/97 <br /> Analyzed Date 9/23/97 9/23/97 9/23/97 9/23/97 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> Result 41 40 75 76 <br /> MS % Recovery 82 80 70 82 _ <br /> Dup Result 42 41 78 76 • <br /> MSD% Recov • 84 82 76 82 <br /> RPD 24 25 39 00 <br /> RPD Limit--o-2o 0-20 02a 0-20_ <br /> -LCS # — BLK092397 BLK092397__r— 81-1<092397 _ ;BLK092397 <br /> Prepared Date 9/23/97 9/23/97 9/23/97 9/23/97 <br /> Analyzed Date 9/23/97 9/23/97 9/23/97 9/23/97 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg So mg/Kg <br /> LCS Result: 49 49 49 49 <br /> LCS % Recov: 98 98 98 98 <br /> 80-120 80-120 80-120 80-120 <br /> LCS 80-120 80-120 80-120 80-120 <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 /> SEQUOI ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sam <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <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 /> �iolYnn� <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9709C12 EEE a2> <br />