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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown & Caldwell Client Project 1D Arco 2133-94-5, Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 - <br /> Attention Mindy Wright CC Sample Group 402-1242 Reported Mar 10 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS030994 LC3030994 LCS030994 LCS030994 <br /> Date Prepared. 3/9/94 3/9/94 3/9/94 3/9/94 <br /> Date Analyzed 3/9/94 3/9/94 3/9/94 3/9/94 <br /> Instrument I D #- HP-1 HP-1 HP-1 HP-1 <br /> LCS % <br /> Recovery 94 93 94 87 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#- 4030199 4030199 4030199 4030199 <br /> Date Prepared: 3/9/94 3/9/94 3/9/94 3/9/94 <br /> Date Analyzed' 3/9/94 3/9/94 3/9/94 3/9/94 <br /> Instrument 1.0 #• HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery- 100 100 loo 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 98 97 96 100 <br /> Relative% <br /> Difference 20 62 41 00 <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 /> C._L it 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 CC limits for MS/MSD's are advisory only <br /> Craig C C e and are not used to accept or reject batch results <br /> Project Manager <br /> 4021242 6RS <3 a <br />