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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 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 /> v k r <br /> v <br /> PRESNA Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Solid <br /> tEscalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 4F37901-12 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 /> 1 Analyst. T Grantcher T Granicher T Granicher T Granicher <br /> MS/MSD <br /> ' Batch#: 4F34604 4F34604 4F34604 4F34604 <br /> Date Prepared 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Date Analyzed 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Instrument I D# GCHP-7 GCHP-7 GCHP 7 GCHP-7 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Matrix Spike <br /> % Recovery: 65 70 80 82 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 70 75 85 83 <br /> Relative% <br /> ' Difference 7 4 69 61 12 <br /> LCS Batch# - - - - <br /> ' Date Prepared: <br /> Date Analyzed- <br /> Instrument I.D #. - - - - <br /> ' LCS% <br /> Recovery - - <br /> i <br /> i <br /> ' c/a Recovery <br /> Control Limits: 55-145 47-149 47-155 56-140 <br /> ' Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQU01 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 ff <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 ague Clark <br /> Project Manager 4F37901 WAT <7> <br />