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Sequoia 680 Chesapeake Drove 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 Str,ker Avenue Suites Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604850 01, 02 Reported Apr 25, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,2,4-Trlchloro 4-Chloro-3 Acenaphthene 4-Nitrophenof <br /> benzene Methylphenol <br /> OC Batch# MSO415968270EXA MSO415968270EXA MSO415968270EXA MSO415968270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep. Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst <br /> MS/MSD # <br /> Sample Conc ' <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Conic. Spiked <br /> Result <br /> MS % Recovery <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RPD Limit <br /> LCS# SB041596 SB041596 S6041596 SB041596 <br /> Prepared Date 4/15/96 4/15/96 4/15/96 4/15/96 <br /> Analyzed Date 4/15/96 4/15/96 4/15/96 4/15/96 <br /> Instrument I D# F4 F4 F4 F4 <br /> Conic Spiked 3300jug/Kg 3300 Pg/Kg 3300,ug/Kg 3300 ug/Kg <br /> LCS Result 2600 2600 2400 2300 <br /> LCS % Recov 79 79 73 70 <br /> LCS 40-120 40-120 <br /> 50-140 20-120 <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 /> SEGUOI 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 /> Kevin Follett **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 2 of 3 9604850 TTT <4> <br />