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• r g j Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> 1900 Sates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> 'Rio Analytical 319 Stniter Avenue Suite 8 Sacramento CA 95834 )916) 921 9600 F4X (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 OC Sample Goup 501-0311 Reported Jan 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 24 Dinitro- Penta <br /> Acena hthene 4 N1tro henol toluene chloro henol Pyrene <br /> Method PPA 625 EPA 625 EPA 625 SPA 625 PPA 625 <br /> Analyst S Le S Le S Le S Le S Le <br /> Concentration <br /> Spiked 100 ug/L 200 ug/L 100 ug/L 200 ug/L 100 ug/L <br /> LCS Batch# LCS011895 LCS011895 LCS011895 LCS011895 LCS011895 <br /> Date Prepared 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 <br /> Instrument l D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> LCS % <br /> Recovery 74 49 60 60 62 <br /> Control Limits 46-118 1080 24-96 9-103 26 127 <br /> MS/MSD <br /> Batch # BLK011895 BLK011895 BLK011895 BLK011895 BLK011895 <br /> Date Prepared 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 <br /> Instrument I D # GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> Matrix Spike <br /> % Recovery 74 49 60 60 62 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 60 59 68 69 62 <br /> Relative % <br /> Difference 78 18 12 14 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> �1 The LCS 1s a control sample of known interferent free matrix that is analyzed using the same reagents <br /> CvW� X11 d d preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> Jen re Higgins and are not used to accept or reject batch results <br /> Project Manager Page 2 of 2 <br /> 5010311 BRS <11> <br />