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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> (916) 9219600 - FAX (916) 921 0100 <br /> rown & Caldwell Client Project ID Arco 434-93-5, Lodi <br /> 23 S St Matrix Air <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright OC Sample Group 3090219-220 Reported Sep 13, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 9020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chlaravalloti Chlaravallot <br /> Concentration 20 20 2 0 4 0 <br /> Spiked: mg/cubic m mg/cubic m mg/cubic m mg/cubLc m <br /> LCS Batch# BLK090993 BLK090993 BLK090993 BLK090993 <br /> Date Prepared: 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Date Analyzed' 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 115 110 115 113 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: BLK090993 BLK090993 BLK090993 BLK090993 <br /> Date Prepared 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Date Analyzed: 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Instrument I D #: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery: 115 110 115 113 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 120 115 115 113 <br /> Relative% <br /> Difference 43 44 00 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent tree matnx 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 OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> ICG L <br /> Linda C Schneider <br /> Project Manager 3090219 BRS <2> <br />