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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> tix Associates Client Project 10 ' Arco 203-93-i <br /> 1855 Gateway Blvd , Ste 770 Matrix Sod <br /> Concord, CA 94520 <br /> Attention Paul Supple OC Sample Group 3070919-921 ReportO Jul 23, 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 F J F J F J F <br /> Conc Spiked 0 40 040 0 40 12 <br /> Units mg/Kg mg/Kg mg/Kg mg/Kg <br />' LCS Batch#' 2LCS072293 2LCS072293 2LCS072293 2LCS072293 <br /> Date Prepared- 7/22/93 7/22/93 7/22/93 7/22/93 <br /> IDate Analyzed 7/22/93 7/22/93 7/22/93 7/22/93 <br /> nstrument I D #. HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> to Recovery* 90 90 90 94 <br /> Control Limas: 70-130 70-130 70-130 70.130 <br />' MS/MSD <br /> Batch#. 3070928 3070928 3070928 3070928 <br /> Date Prepared 7/22/93 7/22/93 7/22/93 7/22/93 <br /> Date Analyzed- 7/22/93 7/22/93 7/22/93 7/22/93 <br /> instrument I D.# HP-4 HP-4 HP-4 HP-4 <br />' Matrix Spike <br /> % Recovery 85 85 87 90 <br />' Matrix Spike <br /> Duplicate% <br /> Recovery 85 85 90 91 <br />' Relative% <br /> Difference 00 00 33 1 1 <br /> te <br /> QUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents, <br /> preparation and anaiytical methods employed for the samples The LCS%recovery data Is used for <br /> validation of sample batch results Due to rnatnx effects,the OC limits for MS/MSM are advfsory only <br /> and are not used to accept or reject batch results <br /> nne F Lee <br /> Laboratory Director <br /> 3070919 ROU a2> <br />