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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> a Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Pacific Environmental Group Client Project ID Tosco 5417, Manteca, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Mike Mitchener QC Sample Group S808248 Reported Sep 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Cadmium Chromium Copper Lead Nickel Zinc Silver <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst- J Kelly J Kelly J Kelly J Kelly J Kelly J Kelly J Kelly <br /> Concentration <br /> Spiked 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L <br /> LCS Batch# LCS083198A LCS083198A LCS083198A LCS083198A LCS083198A LCS083198A LCS083198A <br /> Date Prepared 08/31/98 08/31!98 08/31/98 08/31/98 08/31/98 08/31/98 08/31/98 <br /> Date Analyzed 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 <br /> Instrument I D# MV-4 MV-4 MV-4 MV-4 MV-4 M1/-4 MV-4 <br /> LCS % <br /> Recovery 99 99 100 100 100 99 97 <br /> Control Limits 80-120% 80-120% 80-120% 80-120% 80-120% 80-120% 80-120 <br /> MS/MSD <br /> Batch # 8082527 8082527 8082527 8082527 8082527 8082527 8082527 <br /> Date Prepared 08/31/98 08/31/98 08/31/98 08/31/98 08131!98 08/31/98 08/31/98 <br /> Date Analyzed 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 09/02/98 <br /> Instrument I D #• MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 <br /> Matrix Spike <br /> % Recovery 98 96 100 95 98 95 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 97 95 100 94 98 93 93 <br /> Relative % <br /> Difference 1 0 1 0 00 10 00 20 1 1 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MSIMSD's are advisory only <br /> Linda C Schneider <br /> and are not used to accept or refect batch results <br /> ' <br /> Project Manager/Sacramento Laboratory <br /> S808248 PEs eg> <br />