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Sequoia 680 Chesapeake Drive Redwood City,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 /> Cambria v Client Project ID Shell 2575 Country Club <br /> 270 Perkins Avenue Matrix Solid <br /> Sonoma, CA 95476 <br /> 4 Attention Joe Neely Work Order# 9712C93-09, 10 Reported Jan 8, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Beryllium Cadmium Chromium Nickel <br /> QC Batch#. MF-122697601OMDE ME1226976010MOE ME12-2697601OMDE ME122697601OMDE <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 # 9712ES802 9712E8802 9712ES802 9712E8802 <br /> Sample Conc : N D N D 38 30 <br /> Prepared Date 12/26/97 12/26/97 12/26/97 12/26/97 <br /> Analyzed Date 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Instrument I D # MTJA5 MTJA5 MTJA5 MTJA5 <br /> Conc. Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> Result 41 43 80 69 <br />�MS % Recovery 82 86 84 78 <br /> Dup. Result- 41 43 74 68 <br /> MSD % Recov 82 86 72 76 <br /> RPD, 00 00 78 15 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # BLK122697 BLK122697 BLK122697 BLK122697 <br /> Prepared Date 12/26/97 12/26/97 12/26/97 12/26/97 <br /> Analyzed Date 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Instrument LD # MTJA5 MTJA5 MTJA5 MTJA5 <br /> Conc Spiked- 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> LCS Result 50 49 50 51 <br /> LCS % Recov 100 98 100 102 <br /> 80-120 80-120 80-120 80-120 <br /> LCS 80-120 80-120 80-120 80-120 <br /> Control Limits <br /> Please dote <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> OWEQUOIA NALYTICAL 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 /> y <br /> rjager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712C93 GCC <2> <br />