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SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> oux Associates nM Cllerlt Project ID Arca 2'0'98'-W4 <br /> 1855 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul maple QC Sample Group 3071296-1300 Reported Aug 10, 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 040 040 040 12 <br /> Units. mg/Kg mg/Kg mg/Kg mg/Kg <br /> ' LCS Batch#' 1LCS080493 1LCS080493 1LCS080493 ILCS080493 <br /> ' Date Prepared 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Date Analyzed. 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 99 97 99 102 <br /> Control Limits. 70.130 N 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 3070019 3070019 3070019 3070019 <br /> Date Prepared. 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Date Analyzed. 8/4/93 8/4/93 8/4/93 8/4/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br />' Matrix Spike <br /> % Recovery. 100 97 100 100 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 97 95 97 99 <br />' Relative % <br /> Difference 30 21 30 10 <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 /> TrgWra ion 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 0C limits for MS/MSD's are advisory only <br /> Kenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br />' 30712%ROU <5� <br />