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Sequoia 680 Chesapeake Drive Redwood City CA 94063 1415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue quite L C.Onrora CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 5tnker Avenue 8 Sacramento CA 95834 916) 921 9600 FAX (916)921 0100 <br /> Brown & Caldweif <br /> Client Protect ID Arco 2133-95-5 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Goup 501-0311 Reported Jan 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 24-Dinitro- Penta- <br /> Acenaohthene 4-Nltrophenot toluene chlorophenol Pyrene <br /> Method. EPA 625 EPA 625 EPA 625 EPA 625 EPA 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 i_CS011895 LCS011895 LCS011895 <br /> Date Prepared- 1/18/95 1/18/95 1/18/95 1/16/95 1/18/95 <br /> Date Analyzed: 1/19/95 1/19/95 1/19/95 1/19/95 1/19/95 j <br /> Instrument LD.#: 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 10.80 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 80 59 68 69 62 <br /> Relative% <br /> Difference: 78 18 12 14 00 <br /> SEQUOIA ANALYTICAL. Please Note <br />. y ( The LCS is a control sample of known,interferent free matrix that is analyzed easing the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validatton of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> ,fen to Higgins and are not used to accept or reject batch results <br /> Project Manager Page 2 of 2 <br /> 5010311 BRS <I 1> <br />