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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 C #9250390, 5608 N Pershing, Stockton <br /> P O Box 5004 Matrix Water <br /> San Ramon, CA 94583-0804 <br /> Attention Brett Hunter QC Sample Group 3041024-29 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 8024 <br /> Analyst J Dinsay J Dinsay J Dinsay J Dinsay <br /> Conc.Spiked 100 100 100 140 <br /> Units mg/kg mg/kg mg/kg mg/kg <br /> LCS Batch# BLK042393 BLK042393 BLK042393 BLK042393 <br /> Date Prepared 4/23/93 4/23/93 4/23/93 4/23/93 <br /> Date Analyzed 4/23/93 4/23/93 4/23/93 4/23/93 <br /> Instrument I D # ML-2 ML-2 ML-2 ML-2 <br /> LCS % <br /> Recovery 100 110 100 140 <br /> Control Limits ± 20 ± 20 ± 20 ± 20 <br /> MS/MSD <br /> Batch# GB041024 GB041024 GB041024 GB041024 <br /> Date Prepared 4/23/93 4/23/93 4/23/93 4/23/93 <br /> Date Analyzed 4/23/93 4/23/93 4/23/93 4/23/93 <br /> Instrument I D # ML-2 ML-2 ML-2 ML-2 <br /> Matrix Spike <br /> % Recovery 100 105 105 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 100 100 95 <br /> Relative % <br /> Difference 51 51 51 51 <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 /> validation of sample batch results Due to matrix effects,the QC limas for MS/MSD s are advisory only <br /> and are not used to accept or refect batch results <br /> Nokowhat D Herrera <br /> Project Manager 3041024 CHV <4> <br />