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• { Sequoia 680 Chesapeake Drive Redwood City CA 940, (415) 364 9600 FAX(415) 364 9233 <br /> 404N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 986 9673 <br /> 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, STCK <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9701065-05 Reported Jan 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> OC Batch# ME0109976010MDE ME010997601OMDE ME010997601OMDE ME010997601OMDE <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst C Medefesser C Medefesser C Medefesser C Medefesser <br /> MS/MSD # 970120601 970120601 970120601 970120601 <br /> Sample Conc NO N D 35 26 <br /> Prepared Date 1/9/97 1/9/97 1/9/97 1/9/97 <br /> Analyzed Date 1/10/97 1/10/97 1/10/97 1/10/97 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Conc Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg <br /> Result 93 93 130 140 <br /> MS % Recovery 93 93 95 114 <br /> Dup Result 95 95 130 120 <br /> MSD % Recov 95 95 95 94 <br /> RPD 21 21 00 15 <br /> RPD Limit 0-20 0-20 020 0-20 <br /> LCS # BLK010997 BLK010997 BLK010997 BLK010997 <br /> Prepared Date 1/9/97 1/9/97 1/9/97 1/9/97 <br /> Analyzed Date 1/10/97 1/10/97 1/10/97 1/10/97 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Conc Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg <br /> LCS Result 95 97 96 97 <br /> LCS % Recov 95 97 96 97 <br /> MS/MSD <br /> LCS 80-120 80-120 60-120 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 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 /> 1 e Gregory <br /> Project Manager `*MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference 9701065 EEE <2> <br /> gr7l, <br />