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Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 uchstone Developments Client Project ID Chevron #9-4183 <br /> 81 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory QC Sample Group 6041871-874 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Oil & Silver Mercury Cadmium Chromium Nickel Znc <br /> Grease <br /> QC Batch# SP042996 ME042996 ME043096 ME042996 ME042996 ME042996 ME042996 <br /> 4181 MDA 601OMDA 7471 MDA 601OMDB 601OMDB 601OMDB 6010MOB <br /> Analy Method EPA 418 1 EPA 6010 EPA 7471 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3510 EPA 3050 EPA 7471 EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst I Dalvand T Le T Le J Kelly J Kelly J Kelly J Kelly <br /> MS/MSD # 6041863 6041871 6041800 6041871 6041871 6041871 6041871 <br /> Sample Cone 24 mg/kg 0 70 mg/kg 0 028 mg/kg N D 8 3 mg/kg 5 1 mg/kg 33 mg/kg <br /> Prepared Date 4/29/96 4/29/96 4/30/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # Miran 1A MV-1 MV-1 MV 3 MV-3 MV-3 MV-3 <br /> Cone Spiked 125 mg/kg 50 mg/kg 0 10 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Result 158 48 014 45 52 52 76 <br /> MS % Recovery 107 94 112 90 87 94 88 <br /> Dup Result 143 53 015 47 55 54 72 <br /> orSD % Recov 95 104 122 94 93 98 78 <br /> RPD 10 99 69 44 56 38 54 <br /> RPD Limit 030 0-20 0-20 0-20 0-20 0-20 0-20 <br /> LCS # LC8042996 BLK042996 BLK043096 BLK042996 BLK042996 BLK042996 BLK042996 <br /> Prepared Date 4/29/96 4/29/96 4/30/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/29/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br /> Instrument I D # Miran 1A MV-1 MV-1 MV-3 MV-3 MV-3 MV-3 <br /> Colic Spiked 125 mg/kg 50 mg/kg 0 10 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg ` <br /> LCS Result 130 49 Oil 54 56 52 56 <br /> LCS % Recov 104 98 110 408 112 104 112 <br /> LCS 70130 75-125 85-115 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 /> r 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 /> W interference the LCS recoveryIs to be used to validate the batch <br /> Kev1n Van Slambrook **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager <br /> 6041871 TUD <257 <br />