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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Tient Project ID Arco 2168-93-2, Stockton <br /> 3164 Gold Camp Dr, Suite 200 Matrix Sod <br /> Rancho Cordova, CA 95670 Reported Oct 21, 1993 <br /> Attention David Stavarek OC Sample Group 3100215-218 p <br /> QUALITY CONTROL DATA REPORT <br /> ANALM Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Method, EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst, C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 6o mg/kg <br /> LCS Batch#: LCS101893 LCS101893 LCS101893 LCS101893 <br /> Date Prepared: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Date Analyzed: 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I.D.#' HP-1 HP-1 HP-1 HP-1 <br /> V LCS % <br /> Recovery: 105 100 105 97 <br /> Control Limds: So-120 8x120 80-120 80-120 <br /> MS/MSD <br /> Batch#: 3100542MD 3100542A-D 3100542A-D 3100542ArD <br /> Date Prepared 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Date Analyzed, 10/18/93 10/18/93 10/18/93 10/18/93 <br /> Instrument I.D.#' HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> %Recovery 90 es so 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 as 913 a5 <br /> Relative% <br /> Difference: 0 0 00 00 00 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> r SEQUOIA ANALYTICAL preparation and analyl3cal methods employed for the samples The LCS%recovery data is used for <br /> f i validation of sample batch results Due to matrix effects,the ClC limits for MS/MSD's are advisory only <br /> (.` �1 �`a <br /> Linnd are not used to axe or reject batch results <br /> da C Schneider <br /> Project Manager <br /> 3100215 RES <2> <br />