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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> X916) 921-9600 e FAX (916) 921 0100 <br /> Aegis Environmental Consultants Client Project ID Shell, 141 N El Dorado, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Goup 304-0355 Reported Apr 20, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 60P EPA 602 EPA 6C2 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravaltoti Chiaravalloti <br /> Concentration <br /> Spiked 10 10 10 30 <br /> LCS Batch# LCSO41693 LCSO41693 LCSO41693 LCSO41693 <br /> Date Prepared 4/16/93 4/16/93 4/16/93 4/16/93 <br /> Date Analyzed 4/16193 4/16/93 4/16/93 4/16/93 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> LCS <br /> Recovery 98 99 96 100 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 3040387 3040387 3040387 3040387 <br /> Date Prepared 4/16/93 4/16/93 4/16/93 4/16/93 <br /> Date Analyzed 4/16/93 4/16/93 41/16/93 4/16/93 <br /> Instrument I D # HP-2 HP 2 HP 2 HP-2 <br /> Matrix Spike <br /> % Recovery 92 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 94 100 100 100 <br /> Relative % <br /> Difference 22 00 00 00 <br />•SEQUOIA ANALYTICAL Please Note <br /> The LCS is a controi 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 /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD's are advisory only <br /> Michael R Giles and are not used to accept or reject batch results <br /> Laboratory Director 3040355 AEG <2> <br />