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41) 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 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Fid , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order # 9511587-17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,2,4-Tnchloro 4-Chloro-3 Acenaphthene 4-Nitrophenol <br /> benzene Methylphenol <br /> OC Batch# MS1109958270EXA MS1109958270EXA MS1109958270EXA MS1109958270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst B Pitamah B Pitamah B Pitamah B Pitamah <br /> MS/MSD # 951156001 951156001 951156001 951156001 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Instrument I D # H5 H5 H5 H5 <br /> Conc Spiked 3300 fug/Kg 3300 fug/Kg 3300 fug/Kg 3300 fug/Kg <br /> Result 2200 2200 2100 2100 <br /> MS % Recovery 67 67 64 64 <br />• Dup Result 2200 2200 2100 2200 <br /> MSD % Recov 67 67 64 67 <br /> RPD 00 00 00 47 <br /> RPD Limit 0-50 0-50 050 0-50 <br /> LCS # BLK110995 BLK110995 BLK110995 BLK110995 <br /> Prepared Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Instrument I D # F4 F4 F4 F4 <br /> Conc Spiked 3300 fug/Kg 3300 jug/Kg 3300 pg/Kg 3300 fig/Kg <br /> LCS. Result 2700 2400 2300 2200 <br /> LCS % Recov 82 73 70 67 <br /> LCS 44-142 22147 47-145 DL-132 <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 />• <br /> SE O IA 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 /> h- the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> V finterference,the LCS recovery is to be used to validate the batch <br /> Mark J Cargasacchi **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager Page 2 of 3 9511587 TTT <8> <br />