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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 ID Arco 2133-94-5, Stockton <br /> P Q Box 13449 Matrix Water <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright CC Sample Group 403-0688 Reported Mar 30 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 Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032294 LCS032294 LCS032294 LCS032294 <br /> Date Prepared 3/22/94 3/22/94 3/22/94 3/22/94 <br /> Date Analyzed 3/22/94 3/22/94 3/22/94 3/22/94 <br /> Instrument LD #: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 105 106 105 103 <br /> Control Limits- 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#' 4030902 4030902 4030902 4030902 <br /> Date Prepared' 3/22/94 3/22/94 3/22/94 3/22/94 <br /> Date Analyzed: 3/22/94 3/22/94 3/22/94 3/22/94 <br /> Instrument I.D.#• HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery- 110 110 110 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- Ito 110 110 100 <br /> Relative% <br /> Difference. 00 00 00 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 /> CA t 4preparation 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/MSD's are advisory only <br /> Craig C ee and are not used to accept or reject batch results <br /> Project Manager <br /> 4030698 8RS <3> <br />