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SEQUOIA ANALYTICAL - - <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 9 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 xytenes. <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#: LCS091493 LCS091493 LCS091493 LCW91493 <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 UmrtS: 80-120 80.120 80-120 80-120 <br /> •u•.��.v.+r h r • n ar + ♦ nv r I + v.v v.x}+A vu...4 } <br /> fN'iv n }1V <br /> w + vWrr <br /> AAS/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 /> i <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 /> and are not used to accept or reject batch results <br /> Linda C Schneider <br />