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Sequoia 680 Chcsapcakc flnvc Redwood City CA 94063 (4t5) 364 9,600 FAX(4t5l 364 9233 <br /> 1900 Bates Avenue Swte L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> i0o �„�/ Analytical 919 Sinker Avenue Susie 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Brown & Caldwell Client Project 1D 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 11-Dichlorc- Chloro- <br /> ethene Trtchloroethene Benzene Toluene benzene Cyanide <br /> Method EPA 624 EPA 624 EPA 624 EPA 624 EPA 624 EPA 335 3 <br /> Analyst M Nguyen M Nguyen M Nguyen M Nguyen M Nguyen J Heider <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 LCS012395 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 96 108 106 104 104 N/A <br /> Control Limits 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 1/23/95 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 1 <br /> Matrix Spike <br /> % Recovery 96 108 108 116 104 102 <br /> Matrix 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 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 /> vw�+-�� nr.o and are not used to accept or reject batch results <br /> Jen ie Higgins d�' <br /> Project Manager <br /> 5010311 BRS <9> <br />