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F7 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 9!1� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> q%W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1*MCON Client Project ID Don Hogers <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Deanna Santos QC Sample Group 803-0885 Reported Apr 2, 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 8260 <br /> Analyst L Bettencourt L Bettencourt L Bettencourt L Bettencourt L Bettencourt <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L 50 ug/L <br /> LCS Batch# LCS032498 LCS032498 LCS032498 LCS032498 LC8032798 <br /> Date Prepared 03/24/98 03/24/98 03/24/98 03/24/98 03/27/98 <br /> Date Analyzed 03/24/98 03/24/98 03/24/98 03/24/98 03/27/98 <br /> Instrument I D.# GCHP-2 GCHP 2 GCHP 2 GCHP-2 MS-F1 <br /> LCS % <br /> Recovery 92 91 91 90 105 <br /> Control Limits- 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8030933 8030933 8030933 8030933 8030783 <br /> Date Prepared 03/24/98 03/24/98 03/24/98 03/24/98 03/26/98 <br /> Date Analyzed 03/24/98 03/24/98 03/24/98 03/24/98 03/26/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 MS-F1 <br /> Matrix Spike <br /> % Recovery 91 92 92 91 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 92 94 93 91 131 <br /> Relative % <br /> Difference 1 1 22 1 1 00 20 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s 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 /> I <br /> validation of sample batch results Due to matrix effects,the DC limits for MS/MSD's are advisory only <br /> Ronald W Bobel and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 8030885 EMC <4> <br />