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d ' Sequoia 680 ChesaaeaKe Drive Pedwood Cjty CA 94063 '415) 364 9600 FAX(415) 364 9233 <br /> '900 Bates Avenue Suite L Concord CA 94520 1510) 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 Pr - <br /> Project 1D Arco 2133 95 5, Stockton � <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson OC Sample Gaup 501-0311 Reported Jan 26, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 1 Dlchloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene Cyanide <br /> Method: EPA 624 EPA 624 EPA 624 EPA 624 EPA 624 EPA 33:5 3 <br /> Analyst: M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen J Helder <br /> Concentration <br /> Spiked- 50 ug/L 50 ug/L 50 ug/L 50 ug/L 50 ug/L 0 080 mg/L <br /> LCS Batch# LCS012395 LCS012395 LCSO12395 LCS012395 LCS012395 N/A <br /> Date Prepared: 1/23/95 1/23/95 1/23/95 1/23/95 1/23/95 N/A <br /> Date Analyzed: 1/23/95 1/23/95 1/23/95 1/23/95 1/23/95 N/A <br /> Instrument I.D # GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 N/A <br /> LCS% <br /> Recovery- 96 108 108 104 104 N/A <br /> Control Limrts: DL-234 71-157 37-151 47-150 37-160 80-120 <br /> MS/MSD <br /> Batch#" 5010495 5010495 5010495 5010495 5010495 9501734-01 <br /> Date Prepared: 1/23/95 1/23/95 1/23/95 1/23/955 1/23/95 1/20/95 <br /> Date Analyzed: 1/23/95 1/23/95 1/23/95 1/23/95 1/23/95 1/20/95 <br /> Instrument I D.#: GC/MS 2 GC/MS 2 GC/MS 2 GC/Ms 2 GC/MS 2 TECH i <br /> Matrix Spike <br /> %Recovery: 96 108 108 116 104 102 <br /> Matnx Spike <br /> Duplicate% <br /> Recovery: 96 100 112 112 112 105 <br /> Relative% <br /> Difference: 00 77 36 35 74 24 <br /> Please Note <br /> The LCS is a control sample of known,interterent 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 /> pyMw.a and are not used to accept or reject batch results <br /> Jen le Higgins <br /> Project Manager <br /> 5010311 BRS <9> <br />