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Sequoia 680 Chesapeake Drove Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> X11 Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Enviros Client Project ID Shell 2575 Country Club, STK <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9701 G31-05 Reported Feb 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> OC Batch# ME020397601OMDE ME020397601OMDE ME020397601OMDE ME020397601OMDE <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 # 9701 H2101 9701 H2101 9701 H2101 9701 H2101 <br /> Sample Cone ND 35 250 84 <br /> Prepared Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Analyzed Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg <br /> Result 97 99 550 120 <br /> MS % Recovery 97 96 300 36 <br /> Dup Result 100 110 460 130 <br /> MSD % Recov 100 110 210 46 <br /> RPD 30 11 18 80 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # BLK020397 BLK020397 BLK020397 BLK020397 <br /> Prepared Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Analyzed Date 2/3/97 2/3/97 2/3/97 2/3/97 <br /> Instrument LD # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg <br /> LCS Result 100 100 110 110 <br /> LCS % Recov .. 100 100 110 110 <br /> M M D <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 /> 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 It <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 /> I7regory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9701G31 EEE <2> <br />