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Sequoia 6fo ChMp<:lu 0,,, Wwood City,U 94065 (413) 364.%00 FAX(413) 96A.")l w <br /> I90011,ne,Avenue,Suite L Concord,CA 94520 (510) 666.9640 FAX(510)446.96M1 <br /> Analytical i19 Striker Awaau,Suitt I Socrarnento,CA 95*34 (916) 921.9600 FAX(M)92i.oroo <br /> Alton Geoscft3nce ' ., ' Clleni Profect lb. Mob}i 04 343 <br /> 30-A Undbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan GSC Sample Group: 5010574-85 Reported: Jan 25, 19% <br /> OUALLTY CONTROL.DATA REPORT <br /> ANAME Benzene Toluene Ethyl Xytenes <br /> Benzene <br /> Method, EPA 8024 EPA 8024 EPA 8020 EPA 8020 <br /> Analyst: A_Tuzon A.Tuzon A. Tuzon A.Tuzon <br /> MS/MSD <br /> Batch#: 5010657 5010657 5410557 5010657 <br /> Date Prepared: 1/20/95 1/20/95 1/20/95 1/20/95 <br /> Date Analyzed: 1/20/95 1/20/95 1/20/95 1/20/95 <br /> Instrument(.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Cone. Spiked: 20frg/L 20Ng/L 20yg/L 60p9/L <br /> Matrix Spike <br /> % Recovery: 90 90 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: as 100 100 140 <br /> Relative % <br /> Difference: 5.4 11 5.1 7.3 <br /> LCS Batch#: 3LCS012095 3LCSOt2495 3LCS012095 3LCS012M <br /> Date Prepared: 1/24/95 1/20/95 1/20/95 1/20/95 <br /> Date Analyzed: 1/24/95 1/20/95 1/20/95 1/20/95 <br /> Instrument l.D.#: HP-5 HP5 HP-5 HP-5 <br /> LCS% <br /> Recovery: 91 97 99 98 <br /> Recovery <br /> Control Limits: 71-133 72-128 72.134 71-120 <br /> Please ate: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> EQUQ) YTICAL,#1271 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. 8 <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 /> nneth Kf. Lee <br /> Laboratory Director <br /> 5010574.ALT 45> <br /> .4� <br />