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n <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> Analytical 1900 eater Avenue Suite L Concord CA 94520 (510) 686-9600 FAX(5 10)686 9689 <br /> 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> �.cr-*+w.+.y7cMc5•,x, q <^»S K`mss !t "y2:3 .a's*bsra.,xN C:r a'niN+�` ^'O`�`c `}a.n.wv+r'' o.`,`r:w+xar'a+.;f-. j fir,�1' `��'-r"'�° zc ' <br /> oe,� .�A:<& 'v>�,.carf a$w ` � <br /> f.,. x"wna�.Sf' o' ',n.o`oKh <br /> F18.9 Client Project ID 38009 10, Stockton P.S 2 <br /> 1710 Main Street Matrw- Liquid k; <br /> Escalon. CA 95320 <br /> Attention John Lane QC Sample Group 9410154 05 Reported: 101q/5,,4 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst:_ J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 9409E5504 9409E5W4 94091=5504 94MESS04 <br /> Date Prepared: NA N.A. NA NA <br /> Date Analyzed: 10/5/94 10/5/94 10/5/94 10/5/94 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked: 1oNg/L 10pg/L long/L 30pg/L <br /> Matrix Spike <br /> %Recovery: 99 98 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 97 96 96 97 <br /> Relative% <br /> Difference: 2.0 21 10 00 <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 N <br /> �}nthe recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> L interference,the LCS recovery Is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9409154 WAT <3> <br />