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rq <br /> / SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 9210100 <br /> OESNA Industries Client Project ID 123009 01/Teichert,Tracy <br /> 3164 Gold Camp Dr, Suite 200 Matrix Water <br /> Rancho Cordova CA 95670 <br /> Attention Claudio Avila OC Sample Group 4040540-542 Reported Apr 29, 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: Chiaravallou Chiaravalioti Cnkeravailoti Chiaravallou <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> • LCS Batch# LGSO42594 LCSO42594 LCSO42594 LCSO42594 <br /> Date Prepared 4/25/94 4/25/94 4/25/94 4/25/94 <br /> Date Analyzed 4/25/94 4/25/94 4/25/94 4/25/94 <br /> Instrument 1.101 #' HP 2 HP 2 HP 2 HP 2 <br /> LCS <br /> Recovery 103 100 101 102 <br /> Control Limits: 75-125 75 125 75-125 75-125 <br /> MS/MSD <br /> Batch# 4040712 4040712 4040712 4040712 <br /> Date Prepared 4/25/94 4 25/94 4/25/94 4/25/94 <br /> Date Analyzed: 4/25/94 4/25194 4/25/94 4/25/94 <br />• Instrument LD # HP 2 uP 2 HP-2 HP-2 <br /> Matrix Spike <br /> Recovery 100 C9 140 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 100 <br /> Relative% <br /> Difference 00 . 0 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is anaivzed using the same reagents <br /> a i preparation and analytical methods employed for the samples The LCS a recovery data is used for <br /> �6 validation of sample batch results Due to matrix effects the OC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4040540 RES <2> <br />