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SEQUOIA ANALYTICAL - <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> &ESNA71ndustnes Client Project TO Arco 760-93-2A, Lodi <br /> 3164 Gold Camp Dr. Suite 200 Matic Soil <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 401-1132 Reported Jan 31, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Total <br /> Benzene Toluene Benzene Xylenes Lead Diesel <br /> EPA <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 9020 EPA 6010 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman D Ballard Chiaravalloti <br /> Concentration <br /> Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg 7 5 mg/kg <br /> LCS Batch#' LCS012794 LCS012794 LCS012794 LCSOt2794 BLK012894 BLK012894 <br /> Date Prepared' 1/27/94 1/27/94 1/27/94 1/27/94 1/28/94 1/28/94 <br /> Date Analyzed- 1/27/94 1/27/94 1/27/94 1/27/94 1/29/94 1/31/94 <br /> Instrument I D.#- HP-1 HP-1 HP-1 HP 1 PE40 HP3B <br /> LCS % <br /> Recovery: 100 100 100 100 104 96 <br /> Control Limits 80-120 80.120 80-120 80-120 80-120 75-125 <br /> MS/MSD <br /> Batch #- 4010767 4010757 4010767 4010767 4010606 BLK012894 <br /> Date Prepared- 1/27/94 1/27/94 1/27/94 1/27/94 1/28/94 1/28/94 <br /> Date Analyzed' 1/27/94 1/27/94 1/27/94 1/27/94 1/29/94 1/31/94 <br /> Instrument I D.# HP-1 HP-1 HP 1 HP-1 PE-40 HP3B <br /> Matrix Spike <br /> % Recovery 110 110 110 108 86 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 95 100 97 86 96 <br /> Relative% <br /> Difference. 95 15 95 11 00 00 <br /> SEQUOIA ANALYTICAL I Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> �Q preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matnx effects,the QC Ilmrts for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4011132 RES <5> <br />