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r SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> 1916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 434-93-5 Lodi <br /> P 0 Box 13449 Matrix Air <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 3120309-310 Reported Dec 10, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA.8020 EPA 6020 EPA 8020 <br /> Analyst Chiaravallotc Chiaravalloti Chiaravalloti Chiaravalloti <br /> Concentration 20 20 20 60 <br /> Spiked mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS Batch# BLK120993 BLK120993 BLK120993 BLK120993 <br /> Date Prepared 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Date Analyzed 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Instrument I D # HP2 HP2 HP2 HP2 <br /> . LCS % <br /> Recovery 100 95 100 100 <br /> Control Limits. 75-125 75-125 75.125 75-125 <br /> MS/MSD <br /> Batch # EILK120993 BLK120993 BLK120993 13LK120993 <br /> Date Prepared - 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Date Analyzed 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Instrument I D.# HP2 HP2 HP2 HP2 <br /> Matrix Spike <br /> % Recovery, 100 95 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 100 105 107 <br /> Relative% <br /> Difference: 4 9 51 49 68 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LGS is a control sarn pie of known interferent free matrix that is analyzed using the same reagants <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> (- G validation of sample batch results Due to matnx effects,the QC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 3120309 SRS <2> <br />