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Sequoia <br /> odd Chesapeake Dri�c 2edwooa Cicv Ca 94063 4151 364 9600 ';AX(415) 364 9233 <br /> 1900 Bates Avenue SuiTe L Concord Ca 91520 5101 686 9600 FAX(510) 686 9689 <br /> Analytical 319 Scr,ker Avenue Since 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwelf Client Project ID Arco 434-94-5, Lodi <br /> 9616 Micron Avenue Suite 600 Matrix Air <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright OC Sample Group 4060241-242 Reported Jun 14, 1994 <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 Chiaravalloti Chiaravalloti Chiaravalioti Chlaravallotl <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m, <br /> LCS. Batch# BLK060894 BLK060894 BLK060894 BLKD60894 <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 /> LCS <br /> Recovery 105 105 105 102 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BLK060894 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 105 105 105 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 105 105 105 <br /> Relative% <br /> Difference 47 00 0 0 29 <br /> SEQUOIA ANALYTICAL I Please Note <br /> CThe LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> A G preparation and analytical methods employed for the samples the LCS 96 recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC fimlts for MS/MSDs are advisory only <br /> Craig C Lee and are not used to accept or reject batch results <br /> Project Manager <br /> 4060241 BRS <2> <br />