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Sequoia 680 Chesapeake Dnvc Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 0 Iwo Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 {916) 921 96W FAX(916)921 0100 <br /> EMCON Client Project ID IBC-Stockton <br /> 1433 N Market Bfvd 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 MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8240 <br /> Analyst LMB LMB LMB LMB Lr Zhu <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch# LCS021898 LCS021898 LCS021898 LCS021898 VM100219SA <br /> Date Prepared 02/18/98 02/18/98 02/18/98 02/18/98 02/19/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 02/19/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 He <br /> 10 LCS % <br /> Recovery 98 98 97 97 88 <br /> Control Limits 70-130% 70130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8020221 8020221 8020221 8020221 980287001 <br /> Date Prepared 02/18/98 02/18/98 02/18/98 02/18/98 02/17/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 02/17/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 H6 <br /> Matrix Spike <br /> % Recovery 100 100 99 100 116 <br /> I <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 100 118 <br /> Relative % <br /> Difference 00 00 1 0 0 0 1 7 <br /> SE fCIA ANALYTICAL Please Nate <br /> / The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents <br /> 0 "- Z �/ .f / , <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s 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 *Matrix interference <br /> Project Manager/Sacramento Labora ory <br /> 8020277 EMC <5> <br />