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. ' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415)364 9233 <br /> Analytical 404 N vrrget Lane Walnut Creek,CA 94598 (510) 968-9600 FAX(510)988 9673 <br /> WUP819 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> 1'ugro West, Inc ` AVlient Project I[7 Shell, 141 N RI Do�adli, Stockton;CA <br /> 1050 Melody Labe, Ste 160 Matrix <br /> ' Roseville, CA 95678 4 <br /> Attention Sudhakar Talanki QC Sample Group Reported Sep 15, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> [A NALYTE <br /> Cadmium Chromium Lead Nickel Zinc Copper 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. K Sarta K Barta K.Barta K Sarta K Sarta K Barta K Sarta <br /> Concentration <br /> Spiked. 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 rng/L <br /> LCs Batch#. LCS090895 LCS090895 LCS090895 LOS090895 LCS090895 LCSOW695 LCS090695 <br /> Date Prepared. 9/8/95 9/8/95 9/8/95 9/8/95 9/8/95 9/6/95 9/6/95 <br /> Date Analyzed: 9/14/95 9/14/95 9/14/95 9/14/95 9/14/95 9/20/95 9/20/95 <br /> Instrument I.D #, P-40 P-40 P-40 P-40 P-40 P-40 P-40 <br /> LCS <br /> Recovery: 99 96 97 94 103 96 94 <br /> Control Umds. 80-120 80.120 80-120 60-12D 80-120 80-120 80-120 <br /> ., „ , c ,. ., .,. v .+ vt,��r + vx,.,,.. ..� } } .,. .. �,c y t Y•1 oc4 4. "" , ` ++ <br /> ,..}a <br /> MS/MSD <br /> Batch #. 5090253 5490253 5090253 5090253 5090253 5090253 5090253 <br /> Date Prepared: 9/8/95 9/8/95 9/8/95 9/8/95 9/8/95 9/6/95 9/6/95 <br /> Date Analyzed: 9/14/95 9/14/95 9/14/95 9/14/95 9/14/95 9/20/95 9/20/95 <br /> Instrument I.D.#' P-40 P-40 P-40 P-40 P-40 P-40 P-40 <br /> Matrix Spike <br /> % Recovery: 101 100 98 94 104 97 94 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 101 100 99 s9 103 92 <br /> Relative <br /> Difference: 00 00 10 42 096 31 <br /> 2 2 <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 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 MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Linda Schneider <br /> Project Manager <br /> 5090177Fuo <io> <br />