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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9.133 <br /> 404 N WEget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> �11>� Analytical 819 Smkcr Avenue Suite 8 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-Nltrophenol <br /> benzene Methylphenof <br /> QC Batch# MSO415968270EXA MSO415988270EXA MSO415968270EXA MSO415968270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 35W EPA 3550 EPA 3550 <br /> Analyst <br /> MS/MSD #. <br /> Sample Cone <br /> Prepared Date <br /> Analyzed Date <br /> Instrument LD#. <br /> Cone Spiked <br /> Result <br />. MS % Recovery <br /> Dup Result. <br /> MSD % Recov : <br /> RPD <br /> RAD Limit <br /> LCS#- SBO41596 SB041596 SB041596 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 /> Conc Spiked 3300 pg/Kg 3300 pg/Kg 3300 pg/Kg 3300pg/Kg <br /> LCS Result- 2600 2600 2400 2300 <br /> LCS % Recov 79 79 73 70 <br /> LCS 40-120 40.120 50-140 20-120 <br /> Control Limits <br /> Please Note <br /> The LCS Is a control sample of known,Interferent-free matrix that 1s analyzed using the same reagents <br /> SEQUOI ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 />