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J \ Sequoia 680 Chesapeake Drive Redwood Csty CA 94063 (415) 364 9600 FAX{415) 364 9233 <br /> 1900 Bates Avenue Suite L Concora CA 94520 X510) 686 9600 FAX (510) 686 9689 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-95-5 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson CC Sample Gaup 501-0311 Reported Jan 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 7 4-Dichloro- N Nitroso 01- 1 2 4-Trichloro- 4-Chloro-3- <br /> Phenol 2 Chloro henol benzene N propylamine benzene Meth I hen I <br /> Method EPA 625 EPA 625 EPA 625 EPA 625 EPA 625 EPA 625 <br /> Analyst S Le S Le S Le S Le S Le S Le <br /> Concentration <br /> Spiked 200 ug/L 200 ug/L 100 ug/L 100 ug/L 100 ug/L 200 ug/L <br /> LCS Batch# LCS011895 LCS011895 LCS011895 LCSol 1895 LCS011895 LCS011895 <br /> Date Prepared 1/18/95 1/18/95 1/18/95 1/18/95 1/18/95 1/18/95 <br /> Date Analyzed 1/19/95 1/19/95 1/19/95 1/19/95 1/19/95 1/19/95 <br /> Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> LCS % <br /> Recovery 72 77 74 72 66 65 <br /> Control Limits 12 89 27-123 36-97 41-116 3998 23-97 <br /> MS%MSD <br /> Batch # SLK011895 BLK011895 BLK011895_BLK011895_BLKOi1895_BLK011895 <br /> - Date Prepared — 1/18/95 _ 1/18/95 _ 1/18/95 1/18/95 —1/18/95 1/18/95 - - — <br /> Date Analyzed 1/19/95 1/19/95 1/19/95 1/19/95 1/19/95 1/19/95 <br /> Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> Matrix Spike <br /> % Recovery 72 77 74 72 66 65 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 78 83 82 78 74 71 <br /> Relative % <br /> Difference 80 7 5 10 so 11 88 <br /> Please Note <br /> SEQUOIA ANALYTICAL 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 1s used for <br /> Z � p validation of sample batch results Due to matrix effects the GC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Je ie Higgins <br /> Project Manager Page 1 of 2 <br /> 5010311 SRS <10 n <br />