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} <br /> ® Sequoia 680 Chesapeake Drive Redwood City CA 94063 1415) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Batcs Avenue Suite L Concord CA 94520 1510) 686 9600 FAX (510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 916) 921 9600 FAX (916) 921 MO <br /> t96own & Caldwell Cl tent Prolect ID Arco 2133-94-5, Stockton <br /> 16 Micron Avenue, Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Wright QC Sample Goup 407-0473 Reported Jul 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> [--ANALYTE 11-Dichloro- Trichloroethene 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 /> 491 Recovery: 106 112 114 107 105 <br /> Control Limits" DL-234 71-157 37-151 47-150 37-160 <br /> MS/MSD <br /> Batch#: 4070528 4070528 4070528 4070528 4070528 <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% <br /> Recovery 99 107 108 105 105 <br /> Relative% <br /> Difference: 91 6 6 7 1 5 3 51 <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 /> 0validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> V►LL f C� L,_r and are not used to accept or re ect batch results <br /> Craig C L e <br /> Project Manager <br /> 4070473 BRS 4107 <br />