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i <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 • FAX (916) 921 0100 <br /> Brown & Caldwell Client Project !D Arco 434-94-5, Lodi <br /> P Q Box 13449 Matrix Air <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 4010044-045 Reported Jan 14, 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 JF JF JF JF <br /> Concentration <br /> Spiked 20ug/L 20 u9/L 20ug/L 60ug/L <br /> LCS Batch# ,31-CS0101594 3LCS0101594 3LCS0101594 3LCS0101594 <br /> Date Prepared 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Date Analyzed 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Instrument I D # HP-5 HP-5 HP 5 HP 5 <br /> LCS % <br /> Recovery 101 98 92 93 <br /> Control Limits 71-133 72 128 72-130 71-120 <br /> MS/MSD <br /> Batch # 0101594 0101594 0101594 0101594 <br /> Date Prepares! 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Date Analyzed 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Instrument I D #. HP 5 HP-5 HP 5 HP-5 <br /> Matrix Spike <br /> %Recovery* 105 100 90 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 105 105 100 100 <br /> Relative % <br /> Difference. 00 49 11 73 <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 /> validation of sample batch results Due to matrix effects the QC limits for MS MSD's area o <br /> ' lnda C Schneider / advisory only <br /> and are not used to accept or reject batch results <br /> Project Manager <br /> 4010044 BRS t2> <br />