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` SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> Iwo (415) 364-9600 • FAX(415) 364-9233 <br /> R E S N A Client Project ID: OW0365.02 Stockton Smith Canal <br /> 1710 Main Street Matrix: Water => <br /> Escalon, CA 95320 <br /> OC Sample Group: 31-30003 Reported: DecAttention: John Lane m r "- <br /> - c 18, 199 <br /> OUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 9020 <br /> Analyst: M.Nipp M.Nipp M.Nipp M.Nipp <br /> MS/MSD <br /> Batch#: 31-10804 31-10804 3L10804 31-10804 <br /> Date Prepared: - - - - <br /> Date Analyzed: 12/8/93 12/9/93 12/8/93 12/8/93 <br /> Instrument I.D.#: GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc.Spiked: 10pg/L 10ug/L 10,ug/L 30{ig/L <br /> Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 103 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 3.3 <br /> { 4-p:•i:"v'-:": .....v.. .r:,'.;i:...................................... }::':v.....z..- :.r..^:{-:::{-{.}..}.::.:..��;;.}::{..y-.}Yi};h}}:n:4:;{{h• <br /> ..;.;.r.........�.:.::.:.n:{.:}.:err z.':'..,................4.h..:.::.:...... ..:....}.::.{:.R: _1'. <br /> :':ir.: <br /> .................... -.,-:_.:''}.'.i <br /> -°- ..,;,.°::?.fi r..;.R4vo::.6t.;, ..r:.4.::............. .......... .......:.:;:{..:ar..}::.}:: .... _�_ �.o--u <br /> ...4...G:.n:.:.nni.�::::....... .. .... ..:.:.i:..:.:....:.v...:n.r..rr.r.....rrr -....r.... ...r..:..::�:�......:.:...........:.:. �. .::....:.}.4}...G:..:.{{.::..riv:;v{'i.{- ..t.¢:.v:::ti riir::rr::_ <br /> LCS Batch#. - - - - <br /> Date Prepared: - - <br /> Date Analyzed: - <br /> Instrument I.D.#: - - <br /> LCS % <br /> Recovery: - - <br /> % Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Note: <br /> The LCS is a control sample of known,interferent 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 /> Vickie Tag <br /> Project Manager 31-30001MAT <3> <br />