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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(5 10)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 D100 <br /> Pacific Environmental Group Client Project ID 311-174 1 A BP#5447 Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID / <br />' San Jose, CA 95110 <br /> Attention Joe Muzzio Work Order # 9802947 01 Reported Feb 25, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br />' QC Batch# ME021898601OMDE ME0218986010MDE ME0218986010MDE ME021898601OMDE <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 # 980294701 980294701 980294701 980294701 <br /> Sample Conc N D N D 27 26 <br /> Prepared Date 2/18/98 2/18/98 2/18/98 2/18/98 <br /> Analyzed Date 2/18/98 2/18/98 2/18/98 2/18/98 <br /> Instrument I D # MTJA5 MTJA5 MTJA5 MTJA5 <br /> 1 Conc Spiked 50 mg/Kg 50 mg/Kg 50 mg/Kg 50 mg/Kg <br /> Result 42 41 75 69 <br /> MS % Recovery 84 82 96 86 <br /> Dup Result 46 45 86 76 <br /> MSD % Recov 92 90 118 100 <br /> RPD 91 93 14 97 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS #}` BLK021898 BLK021898 BLK021898 BLK021898 <br />' Prepared Date 2/18/98 2/18/98 2/18/98 2/18/98 <br /> Analyzed Date 2/18/98 2/18/98 2/18/98 2/18/98 <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 50 47 50 49 <br />' LCS % Recov 100 94 100 98 <br /> 80-120 80-120 80-120 80-120 <br />' LCS 60-120 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 /> �1 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 /> Tod Granicher <br /> Project Manager *MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9802947 PPP <11> <br />