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Sequoia 630 Chesapeake Dnvc Redwood City CA 94063 (415) 364 %00 FAX(415) 364 9233 <br /> 404 N Weget Lane Walnut Creek CA 94398 (510) 988 9600 FAX(510) 988 9673 <br /> �, r Analytical 8 t 9 Striker Avenue Susie a Sacramento CA 95834 (916) 921 9600 FAX(916) 921 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 Xylenes <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-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 94 97 98 99 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> r m4 d� K Y tt ♦u r a n{v 4 krj r4 x .- {.+.uxr r}+4 x i .{ ! ♦r r Mi;0 4 v ry ry <br /> , 4 4 1..v'$n~.i } r h wvn rrrr {~ •• '-r 14 r n wryii.:rrn. ryV^n}{.vr Jv. uOCY0.5 vjn ♦ Y u rr 4 t '. `YY k `A ri6J 4x44 }v h r <br /> MS/MSO <br /> Batch # 6031290 6031290 6031290 6031290 <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-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Splice <br /> % Recovery. 84 89 a8 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 97 98 98 <br /> Relative% <br /> Difference 10 86 11 74 <br /> SEQUOIA ANALYTICAL Please Note <br /> j 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 matrix effects,the CC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 6031010 PES <10> <br />