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SequoSequoia 680 Chesapeake Dnve Redwood CA 9q <br /> ia Y 063 (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 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 Woo <br />' RESNA Client Project ID Caulk Stop132 <br /> Matrix Liquid <br /> 42501 Albrae Street ! <br />' Fremont, CA 94538 <br /> Attention Rich Garlow OC Sample Group 4E77401-2 Reported May 24, 1994 <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 A Miraftab A Maattab A Mtraftab A Miraftab <br /> MS/MSD <br />' Batch# 4E67705 4E67705 4E67705 4E67705 <br /> Date Prepared - _ - - <br /> Date Analyzed: 5/15/94 5/15/94 5/15/94 5/15/94 <br />' Instrument I D #• GCHP-17 GCHP 17 GCHP-17 GCHP-17 <br /> Conc Spiked: 10pg/L 10pg/L 10j.g/L 30pg/L <br /> Matrix Spike <br /> %Recovery- 95 95 96 100 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery. 99 100 100 100 <br />' Relative % <br /> Difference 41 51 41 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 72128 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 /> QUOTA 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 /> Vickie Tague Clark interference,the LCS recovery Is to be used to validate the batch <br />' Project Manager 4E77401 RES <2> <br />