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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive o Redwood City, CA 94063 <br /> 40 (415) 364-9600 a FAX (415) 364-9233 <br /> Aegis Environmental Consultants Client Project ID 92-733, Station 695 <br /> 1050 Melody Lane, Suite 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Sheila Rlchgels OC Sample Group 3HA3901-4 Reported Aug 27, 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 R GeCkler R Geckier R Geckler R Geckler <br /> Conc. Spiked 10 10 10 30 <br /> Units jrg/L Yg/L pg/L }ug/L <br /> LCS Batch# BLK082493 BLK082493 BLK082493 BLK082493 <br /> Date Prepared' 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Date Analyzed 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Instrument 1 D # GCHP 18 GCHP-18 GCHP 18 GCHP-18 <br /> LCS % <br /> Recovery 90 90 89 90 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 3H65101 3H65101 31-165101 3H65101 <br /> Date Prepared. 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Date Analvzed: 8/24/93 8/24/93 8/24/93 8/24/93 <br /> Instrument I D # GCHP-18 GCHP 18 GCHP-18 GCHP 18 <br /> Matrix Spike <br /> % Recovery 91 91 91 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 96 93 <br /> Relative% <br /> Difference 43 43 53 33 <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 /> J preparation ano analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix etfects the QC limits for MS/MSDs are advisory only <br /> and are not used to accept or resect batch results <br /> Vickie Tague <br /> Project Manager 3HA3901 AEG <2> <br />