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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project ID 159906 01, PG&E Tracy <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 Reported Oct 13, 1994 <br /> Attention Bill Channell OC Sample Group 9409159-0$ p <br /> rvr <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#: 94OE5506 940E5506 940E5506 940E5 <br /> ' Date Prepared: - <br /> Date Analyzed 10/6/94 1o/s/94 10/6/94 1a/6/94 <br /> Instrument I D #. GCHP3 GCHP3 GCHP3 GCHP3 <br /> ' Conc Spiked- 10pg/L 10Ng/L 101rg/L 30pg/L <br /> Matrix Spike <br /> % Recovery: 99 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 98 100 100 103 <br /> Relative % <br /> Difference: 10 00 00 3 0 <br /> LCS Batch#: - - - <br /> Date Prepared - - <br /> Date Analyzed: <br /> Instrument I D.# - ' <br /> LCS % <br /> Recovery: <br /> �,� ecovery <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 /> fartrfled with known quantities of specific compounds and subjected to the entire analytical procedure R <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 Tague Clark 9409159 WAT <2> <br /> Project Manager <br /> 1 T <br />