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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project ID 159906 o1, PG&E Tracy <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 Reported Oct 13, 1994 <br /> Attention Bill Channell 0C Sample Group 9409159 -01-07 ww h <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> ' Benzene <br /> Method: EPA 8020 EPA 8020 EPA 6020 EPA 802D <br /> Analyst: J Minkel J Minkel J Minkel J Minkel <br /> ' MS/MSD <br /> Batch#: 94OE55W 940E550fi 94GE5506 sa0E5506 <br /> ' Date Prepared: - - - <br /> Date Analyzed: 10/6/94 10/6/94 10/6/94 10/6/94 <br /> Instrument LD #: GCHP2 GCHP2 GCHP2 GCHP2 <br /> ' Conc Spiked: laug/L 10 jig/L long/L song/L <br /> Matrix Spike <br /> % Recovery: 96 95 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 99 100 100 103 <br /> Relative% <br /> Difference: 31 20 00 0 0 <br /> 4 } ..,. . n.,h�°w,. riz,,..-c:n -•f}. t v}.; „rv:.a:.x,....1„i»a.l, A}t~ w., :��Y r`;.�.s.....S.a`G.w�w} ry+l...,.a:ti <br /> ' LCS Batch#: - - <br /> Date Prepared: - - <br /> Date Analyzed. <br /> Instrument I D #- - - - <br /> ' LCS % _ - - <br /> Recovery <br /> % Recovery <br /> ' Control Limits* 71-133 72-125 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 H <br /> ,f '} the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> G (111 1 interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> 9409154 WAT <1 <br /> Project Manager <br />