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SEQUOIA ANALYTICAL <br /> 519 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> 9161 921 9600 • FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright QC Sample Group 312-0316 Reported Dec 16 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 PPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Concentration <br /> Spiked 10 ug/L 0 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS121593 LCS121593 LCS121593 LCS121593 <br /> Date Prepared 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Date Analyzed: 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Instrument I D.#• HP2 HP2 HP2 HP2 <br /> LCS % <br /> Recovery 100 100 100 105 <br /> Control Limits: 80-120 80.120 80.120 80-120 <br /> MS/MSD <br /> Batch # 3120215 3120215 3120215 3120215 <br /> Date Prepared: 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Date Analyzed: 12/15/93 12/15/93 12/15/93 12/15/93 <br /> Instrument I D.#: HP2 HP2 HP2 HP2 <br /> Matrix Spike <br /> % Recovery: 100 98 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 92 93 96 97 <br /> Relative % <br /> Difference 83 52 41 30 <br /> . SEGUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> tt <br /> 4� / � / preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due 10 matrix effects the QC limits for MS/MSDs are advisory only <br /> C Schneider and are not used to accept or refect hatch results <br /> Project Manager <br /> 3120316 SRS <3> <br />