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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue Suite LM Concord, California 94520 <br /> (510) 686-9600 e FAX (510) 686-9689 <br /> oux Associates h Client(project ID " ARCO 4213i]=9S-O St66k 8n <br /> 1855 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Supple QC Sample Group 311-0370 M Reported Nov 9, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> r <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br />' Analyst. J F J F J F J F <br /> Conic Spiked 040 0 40 040 12 <br /> Units. mg/kg mg/kg mg/kg mg/kg <br />' LCS Batch#: 1 LCS110893 1 LCS110893 1 LCS110893 1 LCS110893 <br /> Date Prepared 11/8/93 11/8/93 11/8/93 11/8/93 <br /> Date Analyzed 11/8/93 11/8/93 11/8/93 111/8/93 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 111 109 111 113 <br /> Control LimitS 70-130 70-130 70-130 70-130 <br /> Y <br /> MS/MSD <br /> Batch#- 3110041 3110041 3110041 3110041 <br /> Date Prepared. 11/8/93 11/8/93 11/8/93 11/8/93 <br /> Date Analyzed: 11/8/93 11/8/93 11/8/93 11/8/93 <br /> Instrument I D.#: HP-2 HP-2 HP-2 HP-2 <br /> ' Matrix Spike <br /> % Recovery- 113 110 108 109 <br /> Matrix Spike <br /> ' Duplicate % <br /> Recovery 113 110 110 110 <br /> ' Relative % <br /> Difference 00 0 0 18 091 <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 limits for MS/MSD's are advisory only <br /> C. <br /> and are not used to accept or reject batch results <br /> Kennet K F Lee <br /> boratory Director <br /> ' 3110370 ROU <3> <br />