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r ` ' Sequoia 040 ChesaneaKc l)rzve .cdwooa Cicv ( a 94063 a 15) 504 9600 "AX(4 15) 364 9233 <br /> lvtleal )00 Bates Avenue 0uite L (-incoro (-A '14520 -10) 036 9600 FALX {510)686 9689 <br /> �na <br /> c 19 St-iKer avenue �)u,te 8 -icramento L-A 45433 '116) Q21 9600 f-kX (916) 921 0100 <br /> Brown ' <br /> own & Caldwell Client Project ID Arco 2133-94-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 9,5813-3449 <br /> Attention Mlndv Wright OC Sample Group 405-0783 Reported May 27, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc <br /> Method' EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst D Ballard D Ballard D Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked 1 0 mg/L 1 0 mglL 1 0 mg/L 1 0 mg/L 0 mg/L <br /> LCS Batch# LCS052594 LCS052594 LCS052594 LCS052594 LCS052594 <br /> Date Prepared- 5/25/94 5/25/94 5/25/94 5/25/94 5/25/94 <br /> Date Analyzed: 5/26/94 5/26/94 5/26/94 5/26/94 5/26/94 <br /> Instrument II D.#" PE 40 PE 40 PE 40 PE 40 PE 40 <br /> LCS % <br /> Recovery- 107 104 105 104 108 <br /> Control Limns: 80-120 80.120 80.120 60-120 80-120 <br /> a.'.•six`fcew..n,J <br /> MS/MSD <br /> Batch#: 4050540 4050640 4050540 4050640 4050640 <br /> Date Prepared: 5/25/94 5/23/94 5/25/90 5/25/94 5/25/94 <br /> Date Analyzed: 5/25/94 5/26/94 5/28/94 5/26/94 5/26/94 <br /> Instrument I.D.#: PE 40 PE 40 PE 40 PE 40 PE 40 <br /> Matrix Spike <br /> %Recovery: 105 106 111 106 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 112 109 113 108 111 <br /> ti Relative% <br /> Difference: 55 28 1 s 1 9 3 5 <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/MSUs are advisory only <br /> CACk L !� and are not used to acce t or re ect batch results <br /> Craig C Le'h-1 <br /> Project Manager <br /> 40507633.BRS <4> <br />