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i <br /> Sequoia <br /> 680 Chesapeake Drive E;edwood City CA 44063 14151 964 9600 FAX(415) 364 923! <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 1916) 92t 9600 FAX(916)921 0100 <br /> �) <br /> Brawn & Caldwell Client Prosect ID Arco 2133-94-5, Stockton ` <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright QC Sample Goup 412-0299 Reported Dec 19, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene -- Xylenes Lead <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Barta <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 0 50 mg/L <br /> LCS Bated# LCS121494 LCS121494 LCS121494 LCS121494 LCS121294 <br /> Date Prepared: 12/14/94 12/14/94 12/14/94 12/14/94 12/12/94 <br /> Date Analyzed: 12/14/94 12/14/94 12/14/94 12/14/94 12/14/94 <br /> Instrument I.D.#, GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br /> LCS% <br /> Recovery: 85 84 83 82 94 <br /> Control Limits: 75-125 75-125 75-125 75-125 80-120 <br /> }� . r♦vv .vx r .0 • »r ,v� n r. +4 + r r r . .+vxv„n rrrn v Y�mrr}r v�+{...n Mw4+v � r %fM.r.�tUfw^'M'h •' ""ti <br /> v h ry h x n rnnx <br /> ..r rr r titi ,. r, .. r v v > v,r+}n'"s •.•,,rn a' tf....ti.,.ttr <br /> MS/MSD <br /> Batch#. 4120299 4120299 4120299 4120299 4120266 <br /> Date Prepared: 12/14/94 12/14/94 12/14/94 12/14/94 12/12/94 <br /> Date Analyzed: 12/14/94 12/14/94 12/14/94 12/14/94 12/14/94 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 P-40 <br /> Matrix Spike <br /> % Recovery: 83 82 82 80 96 <br /> Matnx Spike <br /> Duplicate% <br /> Recovery: 90 69 89 90 94 <br /> Relative% <br /> Difference: 81 82 82 12 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS Is a control sample of known,interferent free matrix that Is analyzed using the same reagents. <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matnx effects,the QC limits for MS/MSD's are adwsory only <br /> Jen a Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 4120MISRS <3> <br />