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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686.9600 a FAX 1610)686-9689 <br /> Alton Geoscience Client Project ID: Mobil 04-343/30-0136 <br /> 30-A Lindbergh Ave. Matrix: Uquld <br /> Livermore, CA 94550 <br /> Attention Stephan Rosea OC Sample Group: 4011128-39 <br /> Reported: Jan 28, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> i <br /> Method: EPA$020 EPA a= EPA$020 EPA 8020 <br /> Analyst: J.Fontecha J.Fontacha J.Fontecha J.Fontecha <br /> MS/MSD <br /> Batch#: 4011128 4011128 4011128 4011128 <br /> Date Prepared: 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed: 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Instrument I.D-#: HP-5 HP-5 HP-5 HP-5 <br /> Conc.Spiked: 20 pg/L 20 pg/L 20 erg/L 60 pg/L <br /> Matrix Spike <br /> %Recovery: 115 110 100 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 115 105 100 101 <br /> Relative% <br /> Difference: 0.0 4.7 . 0.0 0.99 <br /> t... <br /> .,.}:.:S.itC_iiv...}.h.. :ii1:"i::;:.'-::�.{.}:-:'::+is?::i':.•.:::...v.:i:.Y:.:_'::::�:?iii:::?:::!.�::: _=:i?{::iii:}.?':i <br /> - ........: .::. :v�.:.i. ,:...... v.:::::::..v1:.r.>,i:::j{i:1-:::.}:�::�::'1`.5'+:i:::w::<•'n'?i:;:::vi;:::.:: <br /> v,n,'rsvv,.:..:.,r.n2,.:.•,.:u.:.�:,::s:r:.vvni.%:iv,'::::,::}':t..2.:,}.ry7::Q]Li2:...vvs:t.:':i}ti?ti`?.:!i.:LS::,:iisv..,t'..,.:.y::'.i}:'v:ri':".riiii:::i?:i':i::i:i:L:.'.:: � <br /> LCS Batch#: 3LCS012694 3LCS012694 3LCS012694 3LCS012694 <br /> Date Prepared: 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed: 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Instrument I.D.#: HM HP-5• HP-5 HP-5 <br /> LCS % <br /> Recovery: 116 112 109 109 <br /> ecovery <br /> FControl Limits: 71-133 72-128 72-130 71-120 <br /> Please Fzte: <br /> The LC*is A MMrol w'ample Of known.'r+o�+^�+�+�'�+.ff-Itdlierent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch, <br /> ren LEnstro <br /> Projm <br /> Project <br /> Manager <br /> 401112SALT a5> <br />