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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 lV Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Straker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> q „� Analytical <br /> 1811UChstone Developments Client Project ID Chevron #9-4183 <br /> Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory QC Sample Group 6041871-874 Reported May 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Cobalt Selenium Capper Lead <br /> QC Batch# ME042996 ME042996 ME042996 ME042996 <br /> 6010MDB 601OMDB 601OMDB 601OMDB <br /> Analy Method EPA 6010 EPA 6010 EPA 7210 EPA 7420 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> ria yst J Kelly J Kelly T Le T Le <br /> M S/MSD # 6041871 6041871 6041871 6041871 <br /> Sample Cone 5 5 mg/kg 5 4 mg/kg 9 1 mg/kg N D <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 5/1/96 5/1/96 5/1/96 <br /> Instrument I D # MV-3 MV-3 MV-1 MV-1 <br /> Cone Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Result 51 49 55 50 <br /> MS % Recovery 91 87 92 100 <br /> Dup Result 49 52 59 48 <br /> orSD % Recov 87 93 100 96 <br /> RPD 40 60 70 41 <br /> RPD Limit 0-30 0-20 0.20 0-20 <br /> LCS # BLK042996 BLK042996 BLK042996 BLK042996 <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 5/1/96 5/1/96 5/1/96 <br /> Instrument I ❑ # MV-3 MV-3 MV-1 MV-1 <br /> Cone Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Result 58 58 49 47 <br /> LCS % Recov 116 116 98 94 <br /> LCS 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 recovery1s to be used to validate the batch <br /> Protect Maneagerager <br /> Kevin Van 0ok "*M6=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> 6041871 TUD X277 <br />