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Sequoia 680 Chesapeake Dnvc Redwood C,ty CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Cane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento Ca 95834 (916) 921 9600 FAX(916)931 0100 <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133, Stockton <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6031010-25 Reported Apr 3, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene x enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#. LCS033096 LCS033096 LCS033096 LCS033096 <br /> Date Prepared 03/30/96 03/30/96 03/30/96 03/30/96 <br /> Date Analyzed 03/30/96 03/30/96 03/30/96 03/30/96 <br /> Instrument I D#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 85 82 94 91 <br /> Control Limits 75-125 75-125 75.125 75-125 <br /> Y rn+ti r S4 Y+} rrry $v + ' + rc..ti h}W..LN♦w r'}AxwS[+J Y,CM0. rcnr r vw r + r'S+ v-- + rr.x y♦ ' nnv w}i+m'Gr:W.v- >+Sn^>xv v wn..r.. •..n+.xti x »4 <br /> MS/MSD <br /> Batch#. 6031046 6031046 6031046 6031046 <br /> Date Prepared 03/30/96 03/30/96 03/30/96 03/30/96 <br /> Date Analyzed 03/30/96 03/30/96 03/30/96 03/30/96 <br /> Instrument 1 D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 89 86 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 89 83 <br /> Relative% <br /> Difference 00 36 <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 /> ` -7 : preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> J validation of sample batch results Due to matrix effects,the OC limits for MS/MSD s are advisory only <br /> *7�Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6031010 PES <11> <br />