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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wieet Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92t 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604751 01-06 Reported Apr 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> QC Batch# ME041196601OMDF ME0411966010MDF ME041196601OMDF ME041196601OMDF <br /> Analy. Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method: EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst S O'Donnell S ODonnell S O'Donnell S O'Donnell <br /> MS/MSD#. 960475101 960475101 960475101 960475101 <br /> Sample Conc.- N D N D 14 10 <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <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 93 100 100 <br /> MS % Recovery- 93 93 86 90 <br /> Dup Result 100 100 110 110 <br /> MSD% Recov .. 100 100 96 100 <br /> RPD 73 73 95 95 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> LCS# BLK041196 BLK041196 BLK041196 BLK041196 <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date. 4/11/96 4/11/96 4/11/96 4/11/96 <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 110 110 110 110 <br /> LCS % Recov 110 110 110 110 <br /> LCS 75-125 75-125 75-125 75-125 <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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9604751 TTT <2> <br />