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Sequoia 630 ChesaoeaKe Drive tiedwooa Ci" CA 94063 -15) 364 9600 rAX (415) 364 9233 <br /> �► anaiytaeai 900 Bates Avcnue �uite L Concora C, 94:20 :101 686 9600 FAX(510) 686 9689 <br /> 319 ScnKerAvcnue au ie 8 Sacramento (.A 95834 116) 921 9600 FAX(916)921 0100 <br /> Brown cat Caldwell Client Project ID Arco 2133-94-5 Stocl<ton <br /> 9616 Micron Avenue Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Wright OC Sample Gaup 407-0473 Reported Jul 26 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 t Dwhloro- Tnchloroetnene Benzene Toluene Chlorobenzene <br /> ethene <br /> Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Analyst K Lee K Lee K Lee K Lee K Lee <br /> Concentration <br /> Spiked 50 ug/L 50 ug/L 50 ug/L 50 ug/L 50 ug/L <br /> LCS Batch# LCS071594 LCS071594 LCS071594 LCS071594 LCS071594 <br /> Date Prepared* 7/15/94 7/15/94 7/15/94 7/15/94 7/15/94 <br /> Date Analyzed 7/15/94 7/15/94 7/15/94 7/15/94 7/15/94 <br /> Instrument I D # GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 <br /> LCS % <br /> Recovery, los 112 114 107 los <br /> Control Limits: OL-234 71-157 37-151 47-150 37-160 <br /> MS/MSD <br /> Batch#' 4070528 4070528 40711528 4070529 4070529 <br /> Date Prepared: 7/15/94 7/15/94 7/15/94 7/15/94 7/15/94 <br /> Date Analyzed: 7/15/94 7/15/94 7/15/94 7/15/94 7/15/94 <br /> Instrument I D # GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 <br /> Matrix Spike <br /> % Recovery* 109 115 116 110 111 <br /> Matrix Spike <br /> Duplicate g% <br /> Recovery 99 107 108 105 105 <br /> Relative % <br /> Difference: 9 1 6 6 71 53 5 1 <br /> Please Note <br /> The LCS 1s 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 /> GO�i C (-� and are not used to accent or reject batch results <br /> Craig C e <br /> Project Manager <br /> 4070473 SRS 410> <br />