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Sequoia 680 Che"pezke Drive Redwood Cay CA 94063 (650) 364-9600 FAX(650) 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 /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792 0342 <br /> • <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A13-01 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> QC Batch#. ME041798601OMDE ME041798601OMDE ME04179860101VIDE ME041798601OMDE <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 LaBarron S LaBarron S LaBarron S LaBarron <br /> MS/MSD # 9804A3301 9804A3301 9804A3301 9804A3301 <br /> Sample Conc - ND ND 22 70 <br /> Prepared Date 4/17/98 4/17/98 4/17/98 4/17/98 <br /> Analyzed Date 4/18/98 4/18/98 4/18/98 4/18/98 <br /> Instrument LD # MTJA5 MTJA5 MTJA5 MTJA5 <br /> Conc Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> Result 40 40 61 79 <br /> MS %Recovery so 80 78 i8 <br /> Dup Result 37 38 63 150 <br /> MSD % Recov 74 76 82 160 <br /> RPD 78 51 32 62 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # BLK041798 BLK041798 BLK041798 BLK041798 <br /> Prepared Date 4/17/98 4/17/98 4/17/98 4/17/98 <br /> Analyzed Date 4/18/98 4/18/98 4/18/98 4/18/98 <br /> Instrument I D # MTJA5 MTJA5 MTJA5 MTJA5 <br /> Conc Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> LCS Result 48 49 49 49 <br /> LCS % Recov 96 98 98 98 <br /> MS/IVISD 80-120 80-120 80-120 80-120 <br /> LCS 80-120 80-120 80-120 80-120 <br /> Control Limits <br /> Piease Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANLYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> /f_ 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 /> egory <br /> interference,the LCS recovery is to be used to validate the batch <br /> r <br /> �i r lett Manager **MS=Matrix Spike MSD=MS Duplicate RPDwRelative% Difference <br /> ,fig, 9804A13 GET c6> <br />