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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Wzlnut Creek CA 94598 (5 10)988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> X117 Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Gettler Ryan/G eostrategies Client Project ID Unocal 5421, 140162 02 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order # 9804C43-03 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> OC Batch,# ME0422986010MOE ME042298601OMDE ME0422986010MOE ME042298601OMDE <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst T Sears T Sears T Sears T Sears <br /> MS/MSD # 9804DO101 9804DO101 9804DO101 9804DO101 <br /> Sample Cone 059 ND 44 36 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Instrument I D # MTJA5 MTJA5 MTJA5 MTJA5 <br /> Cone Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> Result 37 37 84 68 <br /> MS % Recovery 73 74 80 64 <br /> • Dup Result. 38 38 83 71 <br /> MSD % Recov 75 76 78 70 <br /> RPD 27 27 12 43 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # BLK042298 BLK042298 BLK042298 BLK042298 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Instrument I D-# MTJA5 MTJA5 MTJA5 MTJA5 <br /> Cone Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> LCS Result 48 49 48 49 <br /> LCS % Recov 96 98 96 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 /> 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 /> � regory <br /> Rrolect Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9804043 GET <6> <br />