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n <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> limp (916) 921 9600 FAX {9161 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-94-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindv Wright OC Samole 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 Chiaravadoti Chiaravalloti <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L d ug/L 30 ug/L <br /> LCS Batch# LCS032294 LCS032294 L-CS032-294 LC3032-294 <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 /> 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- 110 110 110 100 <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 1s analyzed using the same reagents, <br /> G1 preparation and analytical methods employed for the samples The LCS recovery data is used for <br /> validation of sample batch resuits Due to matrix effects the OC limits for MS/MSG's are advisory only <br /> Craig C @ and are not used to accept or reject batch results <br /> Project Manager <br /> 4030158881`11S <3> <br />