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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM • Concord California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> inc Associates^ AV Client`Project'ID V YArco'2093-!)84 <br /> 1855 Gateway Blvd, Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> Attention Paul Sjple OC Sample Goup. 3071298&1300 Reported Aug 10, 1993 <br /> v'�nhit h 4+ v v ♦ , r, v ,++ n v v v ♦ « t + + r <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE, 1,1-Dichloro- Trichloroethene Chloro- <br /> ethene Benzene Lead <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 7421 <br /> ' Analyst K N K N K N K V S <br /> Conc. Spiked 10 10 10 50 <br /> Units ug/L ug/L ug/L mg/K9 <br /> LCS Batch# LCS080393 LCS080393 LCS080393 BLK080393 <br /> Date Prepared. 8/3/93 8/3/93 8/3/93 8/3/93 <br /> Date Analyzed- 8/3/93 8/3/93 8/3/93 8/9/93 <br /> instrument I.D.# HP-5890/7 HP-5890/7 HP-5890/7 SpectrAA-400 <br /> 10 LCS OA <br /> Recovery 110 110 98 94 <br /> Control Limits 70-130 70-130 70-130 75-125 <br /> MS/MSD <br /> Batch# 3080019 3080019 3080019 3071298 <br /> Date Prepared. 8/3/93 8/3/93 8/3/93 8/3/93 <br /> iDate Analyzed: 8/3/93 8/3/93 8/3/93 8/9/93 <br /> nstrument I.D.#- HP-5890/7 HP-5890/7 HP-5890/7 SpectrAA-400 <br /> Matrix Spike <br />' %Recovery* 62 83 78 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 67 83 78 82 <br /> Relative % <br />' Difference 78 00 00 16 <br /> Please Note <br /> The LOS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> OUOIA AN LYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> vatidation of ple batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> kenneth K F Lee <br /> Laboratory Director <br />' 3071296 ROU <6> <br />