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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 434-94-5 Lodi <br /> P O Box 13449 Matrix Air <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 4030360-361 Reported Mar 22 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 JP JP JP J P <br /> Concentration <br /> Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> LCS Batch# LCSO30994 LCS030994 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 5 HP 5 HP 5 HP-5 <br /> LCS % <br /> Recovery 119 106 95 96 <br /> Control Limits 71-133 72128 72 130 71 120 <br /> MS/MSD <br /> Batch# 4021535 4021535 4021535 4021535 <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 D # HP 5 HP-5 HP 5 HP-5 <br /> Matrix Spike <br /> % Recovery 120 110 110 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 125 110 100 102 <br /> Relative % <br /> Difference, 41 00 95 57 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> I r` 64 L �� validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> Craig C - e and are not used to accept or reject batch results <br /> Project Manager <br /> 4030360 8PS <2> <br />