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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 a Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> rfxvkrxM-MwrN =i .orado,Aegis Environmental Consultants .Cient-ir; 0liell Oif, 141 <br /> Stockton <br /> J&50 Melody Lane, Ste 160 Matrix Water <br /> I4oseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 307-0558 Reported Jul 26, 1993 <br /> r r r • yr r ry r F G> nk v v x 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene X lanes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- Chiaravalloti Chiaravallott Chiaravalloti Chiaravalloti <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 10 ug/L <br /> LCS Batch#- LCS072393 LCS072393 LCS072393 LCS072393 <br /> Date Prepared 7/23/93 7/23/93 7/23/93 7/23/93 <br /> Date Analyzed: 7/23/93 7/23/93 7/23/93 7/23/93 <br /> Instrument I D.#: HP-1 HP-1 HP-1 HP-1 <br /> LCS % <br /> Recovery: 95 94 94 94 <br /> Control Limits. 80-120 80-120 80-120 8x120 <br /> v z rv.. v r r } r }n { ♦ rvv t v <br /> ISS/MSD <br /> Batch #, 3070517 3070517 3070517 3070517 <br /> Date Prepared. 7/23/93 7/23/93 7/23/93 7/23/93 <br /> Date Analyzed: 7/23/93 7/23/93 7/23/93 7/23/93 <br /> Instrument LD #: HP-1 HP-1 HP-1 HP-t <br /> Matrix Spike <br /> % Recovery, 94 93 96 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 89 94 90 <br /> Relative% <br /> Difference 43 44 21 54 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix 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 far MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> / J <br /> Linda C Schneider <br /> Project Manager 3070558 AEG <2> <br />