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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 Oi00 <br /> FRESNA Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Liquid <br /> tEscalon, CA 95320 A <br /> Attention Greg Stahl OC Sample Group 4F37914-15 Reported Jun 17, 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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> ' Batch#. 4F39112 41739112 4F39112 4F39112 <br /> Date Prepared- - - - <br /> Date Analyzed 6/8/94 6/8/94 6/8/94 6/8/94 <br /> ' Instrument I D.#. GCHP43 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked 10 ug/L 10 pg/L 10 yg/L 30 Ng/L <br /> Matrix Spike <br /> % Recovery. 110 100 100 103 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 99 98 100 100 <br /> Relative% <br /> ' Difference 11 20 00 30 <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 /> SED OIA 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> tProject Manager 4F37901 wAT <9> <br />