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ke Drive Redwood eary,CA 94063 <br /> uo <br /> SeQ P Sequoia 680 Chess GM (650) 364 9600 FAX 650)364-4233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)986 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Iwo <br /> EMCCN <br /> 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 8020441-0442 Reported Mar 4, 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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS022098 LCS022098 LCS022098 LCS022098 <br /> Date Prepared 02/20/98 02/20/98 02/20/98 02/20/98 <br /> Date Analyzed 02/20/98 02/20/98 02/20/98 02/20/98 <br /> Instrument I D #. GCHP-38 GCHP-38 GCHP-38 GCHP-3B <br /> '• LCS % <br /> Recovery 100 100 101 100 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # BS022098 SS022098 13SO22098 BS022098 <br /> Date Prepared 02/20/98 02/20/98 02/20/98 02/20/98 <br /> Date Analyzed 02/20/98 02/20/98 02/20/98 02/20/98 <br /> Instrument I D # GCHP-3B GCHP-3B GGHP-3B GCHP-38 <br /> Matrix Spike <br /> % Recovery 100 100 101 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 104 104 105 104 <br /> Relative% <br /> Difference 3 9 3 9 39 3 9 <br /> OQUOIA 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 OC limits for MS/MSD's are advisory only <br /> Ronald W Bobel and are not used to accept or re)ect batch results <br /> Project Manager/Sacramento Labors ory <br /> 8020441 EMC <3> <br />