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- ` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical <br /> 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> (town & Caldwell Client Project ID Arco 2133-94-5, Stockton <br /> 9616 Micron Avenue, Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright QC Sample Group 406-0676 Reported Jun 29, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravallob Chiaravalloti Chiaravalloti Chiaravallati <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS062194 LCS062194 LCS062194 LCS062194 <br /> Date Prepared 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Date Analyzed 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP 2 <br /> LCS '/o <br /> Recovery 104 101 103 102 <br /> Control Limits 75-125 75-125 75 125 75-125 <br /> MS/MSD <br /> Batch # 4050751 4060751 4060751 4060751 <br /> Date Prepared 6/21/94 6/21/94 6/21/94 6/21/94 <br /> Date Analyzed' 6/21/94 6/21/94 6/21/94 6/21/94 <br /> instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> Matrix Spike <br /> % Recovery 99 93 96 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 99 100 97 <br /> Relative % <br /> Difference 11 63 41 42 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> ✓f C' 4 1 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 OC limits for MS/MSDs are advisory only <br /> Craig C Lee and are not used to accept or reject batch results <br /> Project Manager <br /> 4050576 SRS c 3> <br />