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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 2133-93-5, Stockton <br /> 723 S St Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright OC Sample Group 309-0404 Reported Sep 16, 1993 <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 /> I <br /> LCS Batch# LCSo91493 LCS091493 LCS091493 LCS091493 <br /> Date Prepared 9/14/93 9/14/93 9/14/93 9/14/93 <br /> Date Analyzed 9/14/93 9/14/93 9/14/93 9/14/93 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> LCS % <br /> Recovery 110 110 110 110 <br /> Control Limits 80.120 80-120 80-120 843-120 <br /> MS/MSD <br /> Batch # 3090321 3090321 3090321 3090321 <br /> Date Prepared 9/14/93 9/14/93 9/14/93 9/14/93 <br /> Date Analyzed 9/14/93 9/14/93 9/14/93 9/14/93 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 99 98 100 <br /> Relative % <br /> Difference 00 10 20 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />. SEQUOIA ANALYTICAL 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 OC limits for MS/MSD s are advisory only <br /> j, •CJS and are not used to accept or re ect batch results <br /> Linda C Schneider <br /> Project Manager 3090404 BRS <3, <br />