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Sequoia 680 Chesapeake Dnve Redwood Ctry CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VEW <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)931 MO <br /> SECOR Client Project ID ARCO 2133, Stockton, CA <br /> 3050 Fite Circle, Ste 204 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky OC Sample Group 8030992-1011 Reported Apr 7, 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 L Bettencourt L Bettencourt L Bettencourt L Bettencourt <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCSO40198 LC8040198 LC8040198 LCSO40198 <br /> Date Prepared 04/01/98 04/01/96 04/01/98 04/01/98 <br /> Date Analyzed 04/01/98 04/01/96 04/01/98 04/01/98 <br /> Instrument I D # GCHP 7 GCHP 7 GCHP-7 GCHP 7 <br /> LCS <br /> Recovery f' 100 100 99 99 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8031323 8031323 8031323 8031323 <br /> Date Prepared 04/01/98 04/01/98 04/01/98 04/01/98 <br /> Date Analyzed 04/01/98 04/01/98 04/01/98 04/01/98 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 100 96 94 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 99 97 95 <br /> Relative% <br /> Difference 00 31 31 1 0 <br /> �SEQU IA ANALYTIC L 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 1s used for <br /> / <br /> validation validation of sample batch results Due to matrix effects the QC I=its for MS/MSDs are advisory only <br /> a C Schneider and are not used to accept or refect batch results <br /> ect Manager/Sacramento Laboratory <br /> 8030992 SES <15> <br />