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` / \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project K) ARCO 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Mark Capps OC Sample Group 8020234-0241 Reported Mar 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead MTBE MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010A EPA 8260 EPA 8260 <br /> Analyst C Lee C Lee C Lee C Lee S Phillips MW/LD E M/L D <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg 2,500,ug/kg 2,500 pg/kg <br /> LCS Batch# LCS021198 LCS021198 LCS021198 LCS021198 LCS021298 VMB0219S VM80220T <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 02/12/98 02/19/98 02/20/98 <br /> Date Analyzed 02/11/98 02/11/98 02/11/98 02/11/98 02/18/98 02/19/98 02/20/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 ICP-1 H6 He <br /> LCS % <br /> Recovery 105 107 106 105 96 80 96 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 80120% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8020229 8020229 8020229 8020229 8020241 9802A26-01 9802A26-01 <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 02/12/98 02/19/98 02/19/98 <br /> Date Analyzed. 02/11/98 02/11/98 02/11/98 02/11/96 02/18/98 02/19/98 02/19/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 iCP-1 He He <br /> Matrix Spike <br /> % Recovery 84 66 86 86 96 80 80 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 84 84 86 85 92 74 74 <br /> Relative <br /> Difference 00 24 00 12 42 78 78 <br /> UOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 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/MSDs are advisory only <br /> Ronald W Bobel and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory <br /> 8020234 EMC <15> <br />