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i <br /> t � _Sequoia 1 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue Suite L—Concord CA 94520 (510) 686 9600 FAX(5J 0) 686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> I <br /> li <br /> eocon Client Project ID 305 S Hutchins <br /> 3235 Sunrise Blvd , Suite 6 Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Richard Walls QC Sample Group 4120022-27 Reported Dec 8, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Trlchloro- Chloro- <br />' 1,1-Dichloroethene ethane benzene <br /> Method EPA 601 EPA 601 EPA 601 <br /> Analyst' K Nill K Nill K Nill <br />' Concentration <br /> Spiked' 10 ppb 10 ppb 10 ppb <br /> 1 <br /> LCS Batch#' LCS 120694 LC8120694 LCS120694 <br /> Date Prepared' N/A N/A N/A <br /> Date Analyzed- 12/6/94 12/6/94 12/6/94 <br />' Instrument I D #' HP5890/6 HP5890/6 HP5890/6 <br /> LCS% <br /> Recovery 132 78 83 <br /> Control Limits: 28-167 35.146 38-150 <br /> u r ,fir <br />' MS MSD <br /> Batch# 1 4120122 4120122 4120122 <br /> Date Prepared' ' N/A ° ° N/A N/A <br /> Date Analyzed 12/6/94 12/6/94 12/6/94 <br />' Instrument I D # HP5890/61 HP5890/6 HP5890/6 <br /> Matrix Spike, <br /> % Recovery I 121 i I ' ' 89 79 <br /> 15 <br /> Matrix Spike; i <br /> Duplicate%I, A;I <br />' Recovery: 114 80 71 <br /> Relative% <br /> Difference, 60 11 11 <br /> l <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 /> Je ie Higgins I l a <br /> Project Manager <br /> 4120022 GEC <10> <br /> I <br /> li <br />