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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID 8264-2, Chevron 9-8264 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 9511A10-02 Reported Nov 27, 1995 <br /> (QUALITY CONTROL DATA REPORT <br /> Analyte Phenol 2-Chlorophenol 1 4-Dichloro N-Nitroso-Di- <br /> benzene N-propyfamine <br /> QC Batch# MS1116958270EXA MS1116958270EXA MS1116958270EXA MS1116958270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 6270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst B Pitamah B Pitamah 8 Pitamah B Pitamah <br /> MS/MSD # 9511A1002 9511A1002 9511A1002 9511A1002 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/16/95 11/16/95 11/16/95 11/16/95 <br /> Analyzed Date 11/17/95 11/17/95 11/17/95 11/17/95 <br /> Instrument I D # F4 F4 F4 F4 <br /> Cone Spiked 3300 pg/Kg 3300 Ng/Kg 3300pg/Kg 3300 ug/Kg <br /> Result 2100 2300 2100 2200 <br /> MS % Recovery 64 70 64 67 <br />• Dup Result 2100 2200 2100 2100 <br /> MSD % Recov 64 67 64 64 <br /> RPD 00 44 00 47 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # Ell-Ki 11695 Bf_K111695 BLK111695 BLK111695 <br /> Prepared Date 11/16/95 11/16/95 11/16/95 11/16/95 <br /> Analyzed Date 11/17/95 11/17/95 11/17/95 11/17/95 <br /> Instrument 1 D # F4 F4 F4 F4 <br /> Conc Spiked 3300 pg/Kg 3300 ug/Kg 3300pg/Kg 3300 pg/Kg <br /> LCS Result 2200 2300 2300 2200 <br /> LCS % Recov 67 70 70 67 <br /> MS/MS-0- <br /> LCS 5-112 23134 20124 DL-230 <br /> Control Limits <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 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 /> Mark J Cargasacchi **MS=Matrix Spike, MSD=MS Duplicate RPD=Refative%Difference <br /> Project Manager Page 1 of 3 95l lAi0 TTT <2> <br />