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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> aChStone Oevelopments Client Project ID Chevron #9-4183 <br /> 781 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory OC Sample Group 6041871-874 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Thallium Vanadium Beryllium Barium Molybdenum Arsenic Antimony <br /> QC Batch# ME042996 ME042996 ME042996 ME042996 ME042996 ME042996 ME042996 <br /> 601OMDB 601OMDB 601OMDB 601OMDB 6010MDB 6010MOB 6010MDB <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst J Kelly T Le T Le J Kelly J Kelly J Kelly J Kelly <br /> MS/MSD # 6041871 6041871 6041871 6041871 6041871 6041871 6041871 <br /> Sample Conic ND 37 mg/kg N D 84 mg/kg N D N D N D <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # MV-3 MV-3 MV-3 MV-3 MV-3 MV-3 MV-3 <br /> Cone Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Result 38 80 46 120 44 47 11 <br /> MS % Recovery 76 86 92 72 88 94 22 <br /> Dup Result 44 78 45 120 41 51 14 <br /> �SD % Recov 88 82 90 72 82 102 28 <br /> RPD 15 25 22 00 71 82 24 <br /> RPD Limit 0-30 0-20 0-20 0-20 0-20 0-20 0-20 <br /> LCS # BLK042996 BLK042996 BLK042996 BLK042996 OLK042996 BLK042996 BLK042996 <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # MV-3 MV-3 MV-3 MV 3 MV-3 MV-3 MV-3 <br /> Cone Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg ' <br /> LCS Result 51 57 57 58 60 54 59 <br /> LCS % Recov 102 114 114 116 120 108 118 <br /> LCS 75-125 75-125 75-125 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, #1271 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 Van Slambrook **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager <br /> 6041871 TUD <26> <br />