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la) SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> . (415) 364-9600 FAX (415) 364-9233 <br /> Chevron USA Inc Client Project ID P O 9550390, 5608 N Pershing, Stockton <br /> P O Box 5004 Matrix Soil <br /> San Ramon, CA 94583-0804 <br /> Attention Brett Hunter OC Sample Group 3041 030-40 Reported Apr 30, 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 J Dinsay J Dinsay J Dinsay J Dinsay <br /> Conc Spiked: 100 100 100 100 <br /> Units mg/kg mg/kg mg/kg mg/kg <br /> LCS Batch# BLK042793 BLK042793 BLK042793 BLK042793 <br /> Date Prepared: 4/27/93 4/27/93 4/27/93 4/27/93 <br /> Date Analyzed: 4/27/93 4/27/93 4/27/93 4/27/93 <br /> Instrument I D# ML-2 ML-2 ML-2 ML-2 <br /> LCS % <br /> Recovery: 95 100 105 100 <br /> Control Limits ± 20 ± 20 20 ± 20 <br /> MS/MSD <br /> Batch# GBLK042793 GBLK042793 GBLK042793 GBLKG42793 <br /> Date Prepared 4/27/93 4/27/93 4/27/93 4/27/93 <br /> Date Analyzed 4/27/93 4/27/93 4/27/93 4/27/93 <br /> Instrument I D # ML-2 ML-2 ML-2 ML-2 <br /> Matrix Spike <br /> % Recovery 90 95 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 95 95 93 <br /> Relative% <br /> Difference. 00 00 00 00 <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 /> Lvalidation 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 /> Nokowhat D Herrera <br /> Project Manager 304-1030 CHV <3> <br />