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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 FAX (916) 921-0100 <br /> Brawn & Caldwell Client Project ID Nrco 2133-94-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright CSC Sample Group 402-1242 Reported Mar 10 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS. Batch# LCS030994 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-1 HP-1 HP-1 HP-1 <br />• LCS % <br /> Recovery 94 93 94 87 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 4030199 4030199 4030199 4030199 <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 1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 97 96 100 <br /> Relative % <br /> Difference 20 62 41 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 /> }C. L �� ���� 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 CC limits for MS/MSD s are advisory only <br /> Craig C Lee and are not used to accept or refect batch results <br /> Project Manager <br /> 4021242 SRS <3> <br />