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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> 61oux sociates V Cllent Project ID ` Aico 2093-93-1,Tracy- <br /> 1 M <br /> racy-1855 Gateway Blvd , Ste 770 Matrix Extract of Soil <br /> Concord, CA 94520 <br /> {Attention Paul Supple LSC Sample Group 3080351-352 Reported Aug 17, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANA YTE STLC <br /> Lead <br /> Method. BPA 7421 <br /> Analyst. K v S <br /> ' Conc. Spiked: 10 <br /> Units: mg/L <br /> ' LCS Batch#: BLK081593 <br /> Date Prepared 8/15/93 <br /> Date Analyzed 8/17/93 <br /> 'Instrument I D.# SpectrAA-400 <br /> LCS o%o <br /> Recovery as <br /> Control Limits 75-125 <br /> MS/MSD <br /> ' Batch #. 3080498 <br /> Date Prepared 8/15/93 <br /> Date Analyzed 8/17/93 <br /> 'Instrument I D #' SpectrAAAW <br /> Matrix Spike <br /> ' %Recovery 99 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery, 98 <br /> Relative% <br /> ' Difference 10 <br /> EQUOIA AN YTICAL 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/MSDs are advisory only <br /> Kenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br /> ' #3080351 ROU <3> <br />