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Sequoia 680 Chesapeake Drive Redwood City CA 94463 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> low Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PMCON Client Project ID 1[30-Stockton` v <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Deanna Santos QC Sample Group 8020277-0278 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 LMB LMB LMB LMB <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# - LCS021798 LCS021798 LCS021798 LCS021798 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> is LCS % <br /> Recovery 90 89 90 90 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8020277 8020277 8020277 8020277 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 88 60 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 90 <br /> Relative % <br /> Difference * 13 40* <br /> S PIA ANALYTICAL Please Note <br /> ;7 <br /> /� � ' The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 7--,�_/,/�j '? 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 /> Ronald W Bobel and are not used to accept or reject batch results *Matrix interference <br /> Project Manager/Sacramento Laboratory <br /> 8020277 EMC <4> <br />