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-� Sequoia <br /> ,i0 CresaoeaKe �., <br /> Me =_dwoon Gc CA 940o3 -151 304 9000 =4JC (415) 364 9233 <br /> '+-) eaccs ��CnLe :- e r_ � uncor❑ L-, 51)20 •I0� bio 9000 FAX{.)IOS 6do 9o39 <br /> Analytical 9 5 nker A,cnue r 3 �seramento (-A 95834 U16 921 9600 =AX e916)921 0100 <br /> Brown & Caldwell Client Project ID „rco 434-94-5 Loai <br /> 9616 Micron Avenue Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Wright CC Samole Group 4060241-242 Reported .tun 14 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 <br /> Analyst Chlaravalloti Chlaravalloti Chiaravallotl Chlaravaliob <br /> Concentration <br /> Spiked 2 0 mg/ml 2 0 mg/mi 2 0 mg/m1 6 0 mg/ml <br /> LCS Batch# BI-KO60894 BLK060894 BLK060894 BLK060894 <br /> Date Prepared 6/8/94 9-18/94 6/8/94 6/8/94 <br /> Date Analyzed 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> LCS % <br /> Recovery 105 105 105 102 <br /> Control Limits 75 125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # OLK060894 BLK060894 BLK060894 BLK060894 <br /> Date Prepared. 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Date Analyzed 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery los 105 105 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 105 105 105 <br /> Relative% <br /> Difference 47 00 00 2 9 <br /> SEQUOIA ANALYTICAL I Please Note <br /> The LCS Is a control sample of known Interferent free matrix that Is analyzed using the same reagents <br /> Vl C,L C ! 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/MSUs are advisory only <br /> Craig C Lee and are not used to accept or reject batch results <br /> Project Manager <br /> 4060241 SRS <2> <br />