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sequoia 680 Cxupcakc Drive Redwood Cary CA c" (415) 364-9600 a FAX (415)364.9233 <br /> 404 N.Wiget Lane Walnut Creek;C4 94 (510) 988-9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> ..rr:.xv p-:;•?-::::.vv:.vvr:r.�.:+?:•::rrr::.:v::::::::x•x::�{,;x;::::::x;•:xvr::nvn-:r.•.:r:n:•nv.::•:xx••'+n:iri•i:�:.:H•xsvv.r:::-:x.:::.xv:vv:::v:x:•x•x.•x.v:�::.:.::xvwv:x::.x vn-�:n::.v...v::.:.......... <br /> .r...::..:.:.:.;.:::nv::�::......::::..vx;• rr....:x:v::::: :::nv::::....... ............... ..r.....r... .....r... .......r.:.:...............A.... <br /> .::: .::.:::.. ....... ....... ......s.r.........r.. <br /> '6 ....... <br /> ..... s....�......... .m?n-:::;:.:y::nvr...:. ;:•:.s .c:::.+.•.v:: Cv:��:x::.:?•.^rc:.s:...x.....::..k...:•r::xv:.vr vii:b:{{p;:•'::>::{{:.::{.i':i::'::Y.:{a.. ...;n.y. <br /> Advanced Geol=nvl�onmeMA Inc Client .Project fly: City of Stockton 1t <br /> 4005 North Wilson Way Matrix: Water ° <br /> Stockton, CA 95205 <br /> j Attention: Bill Little QC Sample Group: S807333 I" Reported: Aug 11, 1998'::: <br /> .... . .. <br /> QUALITY CONTROL DATA REPORT <br /> 1,7-Dichloro- ' Chloro- <br /> I <br /> ethane Trichloroethene Benzene Toluene benzene <br /> Method: EPA 8260 EPA 8260 EPA 8260 EPA;8260 EPA 8260 <br /> Analyst: N.A.N. N.A.N. N.A.N. N.A.N. N.A.N. <br /> Concentration <br /> is <br /> Spiked: 50 ug/L 50 ug/L 50 pg1L 50 ug/L 50 ug/L <br /> LCS Batch#: LCS080798A LCS080798A LCS080796A LCS080798A LCS080798A <br /> i <br /> Date Prepared: 08/07/98 08/07/98 08/07/98 08/07/98 08/07/98 <br /> i Date Analyzed: 08/07/98 08/07/98 08/07/98 08/07/98 08/07/98 <br /> Instrument I.D.#: GC1MS-2 GCI"S-2 GC/MS-2 GC/:M' S-2 GC1MS-2 <br /> LCS % .� <br /> Recovery: 90 108 98 112 118 <br /> L Control Limits: 65.135% 70-130% 70-130% 70-130% 70-130% <br /> i <br /> MSIMSD .� <br /> Batch#: 80BD646 8080646 8080646 8080646 8080646 <br /> Date Prepared: 08/07/98 08/07/98 08/07/98 08/07/98 08107/98 <br /> Date Analyzed: 08/07/98 08/07/98 08/07/98 08/07/98 08/07/98 <br /> Instrument I.D.#: GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 <br /> Matrix Spike ' <br /> % Recovery: 46 54 5.1 55 58 <br /> l <br /> Matrix Spike i. <br /> Duplicate % <br /> Recovery: 92 108 102 110 116 <br /> i <br /> Relative% <br /> Difference: 9.1 12 12 12 13 <br /> 1. <br /> ease Note: li <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 MSIMSD's are advisory only <br /> and are not used to accept or re'ect batch results. <br /> LRonald W. Bobel <br /> Project Manager/Sacramento Laboratory <br /> r <br /> tJ S807333.AM <5> <br />