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Sequoia 680 Chesapeake Drive Wwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wagct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> %Ili Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> EMCON Client Project ID ARCO 2168, Stockton, CA <br /> 1433 N Market Blvd Matrix Air <br /> Sacramento, CA 95834 <br /> Attention Matt Turner QC Sample Group 8010664-0665 Reported Feb 11 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS012298 LCS012298 LCS012298 LCS012298 <br /> Date Prepared. 01/22/98 01/22/98 01/22/98 01/22/98 <br /> Date Analyzed. 01/22/98 01/22/98 01/22/98 01/22/98 <br /> Instrument I D #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 102 100 100 100 <br /> Control Limits- 70-130% 70-130% 70-130% 70130% <br /> MS/MSD <br /> Batch # SS012298 BS012298 65012298 BS012298 <br /> Date Prepared 01/22/98 01/22/98 01/22/98 01/22/98 <br /> Date Analyzed 01/22/98 01/22/98 01/22/98 01/22/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 102 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 99 98 98 98 <br /> Relative % <br /> Difference 30 20 20 20 <br /> ,,WIA 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 reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 8010664 EMC <3> <br />