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- / S <br /> j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> JqW <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> ro West, Inc Client Project 10 Shell, 141 N El Dorado, Stockton, CA <br /> 50 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 405-0231 Reported May 9, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8024 EPA 8020 EPA 8029 EPA 8020 <br /> Analyst D Bailarc D Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked 2 0 mg/m' 2 0 mg/m' 2 0 mg/m3 5 0 mg/m' <br /> LCS Batch# BLK050594 BLK050594 SLK050594 BLK050594 <br /> Date Prepared 5/5/94 5/5/94 5/5/94 5/5/94 <br /> Date Analyzed 5/5/94 5/5/94 5/5/94 5/5/94 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 <br /> LCS <br /> 40 Recovery 105 100 105 105 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # BLK0505-4 BLK050594 BLK050594 BLK050594 <br /> Date Prepared 5/5/94 5/5/94 5/5/94 5/5/94 <br /> Date Analyzed- 5/5/94 5/5/94 5/5/94 5/5/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 105 100 105 105 <br /> Matrix Spike <br /> Duplicate <br /> Recovery. 100 100 100 98 <br /> Relative% <br /> Difference 49 00 4 9 69 <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 /> 01i, I Zvalidation of sample batch results Due to matrix effects the QC 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 /> 4050231 FUG <3> <br />