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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W.get Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> �l 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 Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511553-05 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: 1,2,4-Trichloro 4-Chloro-3 Acenaphthene 4-Nitrophenol <br /> benzene Methylphenol <br /> QC Batch# MS1107958270EXA MS1107958270EXA MS1107958270EXA MS1107958270EXA <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 #: - - - <br /> Sample Conc - <br /> Prepared Date - - <br /> Analyzed Date - - - <br /> Instrument I D # - - <br /> Conc Spiked - - <br /> Result, - - - <br /> MS % Recovery: - - - <br />• Dup Result: - - - - <br /> MSD % Recov. - - <br /> RPD - - - <br /> RPD Limit: 0-50 0-50 0-50 0-50 <br /> LCS #: BLK110795 BLK110795 BLK110795 BLK110795 <br /> Prepared Date 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Analyzed Date 11/7/95 11/7/95 11/7/95 11/7/95 <br /> Instrument I D #. F4 F4 F4 F4 <br /> Conc Spiked 3300pg/Kg 3300 pg/Kg 3300pg/Kg 3300p9/Kg <br /> LCS Result: 2600 2500 2400 2200 <br /> LCS % Recov .: 79 76 73 67 <br /> M M D <br /> LCS 44142 22-147 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 /> . SE 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Mark J Cargasacchf '*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Ditference <br /> Project Manager Page 2 of 3 9511553M <2> <br />