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y j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> NO (916) 921-9600 - FAX (916) 921 0100 <br />*Aegis Environmental Consultants Client Project lD Shell, 141 N El Dorado, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff QC Sample Group 306-1231 Reported Jul 2, 1993 <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. M C M C M C M C <br /> Concentration 20 2 0 20 0-0 <br /> Spiked mg/ mg/ mg/ mg/ <br /> cubic m cubic m cubic m cubic m <br /> LCS Batch#' BLK063093MS BLK063093MS BLK063093MS BLK063093MS <br /> Date Prepared 6/30/93 6/30/93 6/30/93 6/30/93 <br /> Date Analyzed 6/30/93 6/30/93 6/30/93 6/30/93 <br /> Instrument I.D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 110 110 105 103 <br /> Control Limits- 80-120 8x120 80-120 80-120 <br /> MS/MSD <br /> Batch # BLKOBW93 BLK063093 BLK063093 BLK063093 <br /> Date Prepared 6/30/93 6/30/93 6/30/93 6/30/93 <br /> Date Analyzed 6/30/93 6/30/93 6/30/93 6/30/93 <br /> Instrument I D #- HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 110 110 105 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 100 95 90 <br /> Relative % <br /> Difference 95 95 10 13 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> . SEQUOIA ANALYTICAL 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/MSD's are advisory only <br /> ? and are not used to accept or reject batch results <br /> 4 J <br /> Wendy Amundsen <br /> Laboratory Director 3061231 AEG <3> <br />