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4D Sequoia 680 Chesapeake Drive Redwood Citv CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avcnuc �urte L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> Vo Analytical 819 Striker Avenue Suite 8 Sacramento CA 9934 (Q 16) 92t 9600 FAX(916) 921 0100 <br /> rown & Caldwell Client Project 10 Arco 2133-94-5, Stockton <br /> 9616 Micron Avenue Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright QC Sample Group 407-0473 Reported Jul 26 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Arsenic Lead Silver Mercury Cyanide <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 7471 EPA 335 2 <br /> Analyst 0 Ballard 0 Ballard D Ballard D Ballard J Heider <br /> Concentration <br /> Spiked 1 0 mg/L 1 0 mg/L 1 0 mg/L 0 0050 mg/L 0 17 mg/L <br /> LCS Batch# LCS071494 LCS071494 LCS071494 LCS072294 N/A <br /> Date Prepared: 7/14/94 7/14/94 7/14/94 7/22/94 N/A <br /> Date Analyzed 7/15/94 7/15/94 7/15/94 7/22/94 N/A <br /> Instrument I D # PE-40 PE-40 PE-40 SH-1000 N/A <br /> LCS % <br /> IsRecovery 87 87 88 117 N/A <br /> Control Limits: 60-120 80.120 80-120 80-120 90-120 <br /> in i}h¢Np4yu. rr <br /> MS/MSD <br /> Batch#: 4070491 4070481 4070481 4070430 9407391-1 <br /> Date Prepared: 7/14/94 7/14/94 7/14/94 7/22/94 7/14/94 <br /> Date Analyzed: 7/15/94 7/15/94 7/15/94 7/22/94 7/14/94 <br /> Instrument 1.131 * PE-40 PE-40 PE-40 SH-1000 N/A <br /> Matrix Spike <br /> % Recovery 80 83 84 114 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 86 84 123 93 <br /> Relative% <br /> Difference- 12 36 00 75 82 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the sampies The LCS%recovery data is used for <br /> validation of sample hatch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> ,A 6,� C 4_,_, and are not used to acce t or reject batch results <br /> Craig C Ce`e <br /> Project Manager <br /> 4070473 BRS <9> <br />