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a_ ) Sequoia 680 Chesapeake Drive Redwood City 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 /> AnalytiCa1_ 819 Striker Avenue Stiete a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Deanna Santos OC Sample Group 7111184-1189 Reported Dec 8, 1997 <br /> QUALITY CONTROL DATA REPORT` <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8024 <br /> Analyst _ S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS120197 LCS120197 LCS120197 LCS120197 <br /> Date Prepared 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Date Analyzed 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Instrument I D # GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br /> LCS <br /> Recovery 105 100 98 97 <br /> Control Limits 70-130 70-130 70 130 70 130 <br /> MS/MSD <br /> Batch # 7111167 7111167 7111167 7111167 <br /> Date Prepared. 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Date Analyzed 12/01/97 12/01/97 12/01/97 12/01/97 <br /> Instrument I D # GCHP 7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 103 97 95 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 96 94 93 <br /> Relative% <br /> Difference 3 0 1 0 1 0 1 1 <br /> SEQUOIA 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 /> G �G validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> C SChn <br /> Yaamento <br /> I er and are not used to accept or reject batch results <br /> rolect Manager/SacrLabora ory <br /> ,Q� 7111184 EMC <5> <br />