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u <br />,1 <br /> Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1(i) 404 N Wiget Lane Walnut Creek CA 94598 (514) 988 9600 FAX(510)988 9673 <br /> fwr� Analytical a19 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project 1D ARCO 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Mark Capps QC Sample Group 8020243-0248 Reported Mar 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Hexavalent <br /> Chromium PCB-1260 Naphthalene Acenaphthene Pyrene MTBE <br /> Method EPA 7196 EPA 8080 EPA 8100 EPA 8010 EPA 8010 EPA 8260 <br /> Analyst S Phillips L Bettencourt J Miller J Miller J Miller M Williams <br /> Concentration <br /> Spiked 25mg/kg 125pg/kg 2,500 pg/kg 2500 ug/kg 2,500,ug/kg 2,500 Ng/kg <br /> LCS Batch# LCS021798 LCS021798 BLK021998 BLK021998 BLK021998 VMB0219S <br /> BSA/BSDA BSA/BSDA BSA/BSDA <br /> Date Prepared 02/17/98 02/17/98 02/19/98 02/19/98 02/19/98 02/19/98 <br /> Date Analyzed 02/17/98 02/17/98 02/20/98 02/20/98 02/20/98 02/19/98 <br /> Instrument 1 D # Uv-1 GCHP-46 GCHP26 GCHP26 GCHP26 H6 <br /> LCS °.6 <br /> Recovery 98 94 72 68 76 80 <br /> Control Limits 80 120% 40-140% 60-140% 60-140% 60140% 70-130% <br /> MS/MSD BLK021998 BLK021998 BLK021998 <br /> Batch # 8020248 8020242 BSA/BSDA BSA/BSDA BSA/BSDA 9802D2106 <br /> Date Prepared 02/17/98 02/17/98 02/19/98 02/19/98 02/19/98 02/17/98 <br /> Date Analyzed: 02/17/98 02/17/98 02/20/98 02/20/98 02/20/98 02/18/98 <br /> Instrument 1 D # UV-1 GCHP-46 GCHP26 GCHP26 GCHP26 F3 <br /> Matrix Spike <br /> % Recovery 97 73 72 68 76 84 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 114 79 64 64 68 84 <br /> Relative % <br /> Difference 16 80 12 61 11 00 <br /> Please Note <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> UOIA 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 QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020243 EMC <18> <br />