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} rs <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX 916 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 7 ( )921 0100 <br /> { 01) 792 ]$65 FAX(707)792 0342 <br /> IWON-Pinnacle Client Project Ir) ARCO 2130, Stockton, OA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Dave Foley QC Sample Group S809013 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> 112 <br /> Dibromofluoro- 1,2-Dlchloro- 4-Bromofluoro- <br /> methane ethane Toluene benzene <br /> Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br /> Analyst PET PET PET PET <br /> Concentration <br /> Spiked 5 0 pg1L 5 0 pg/L 5 0 pg/L 5 0}tglL <br /> LCS Batch# 8090226-BS1 8090226-BSI 8090226-BSI 8090226-13SI <br /> Date Prepared 09/15/98 09/15/98 09/15/98 09/15/98 <br /> Date Analyzed 09/15/98 09/1198 09/15/98 09/15/98 <br /> Instrument I D # - <br /> LCS % <br /> Recovery 105 101 106 110 <br /> Ontrol Limits 86-118% 80-120% 88-110% 86-115% <br /> MS/MSD <br /> Batch # P809154-04 P809154-04 P80915"4 P809154-04 <br /> Date Prepared 09/15/98 09/15/98 09/15/98 09/15/98 <br /> Date Analyzed 09/15/98 09/15/98 09/15/98 09/15/98 <br /> Instrument I D# - _ <br /> Matrix Spike <br /> % Recovery 107 103 107 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 107 102 105 109 <br /> Relative% <br /> Difference 00 098 1 9 0 91 <br /> Please Note <br /> The LCS is a control sample of known, Interferent free matrix that Is analyzed using the same reagents, <br /> SEQUOIA ANALYTI AL 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 /> and are not used to accept or refect batch results <br /> RMW W Bobel <br /> PRWt Manager/Sacramento Laboratory <br /> S809013 EMC <10> <br />