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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 /> l�Il� Analytical 819 Sinker 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 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch#- MSO415968270EXA MSO415968270EXA MSO415968270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method 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 /> Conc. Spiked. <br /> Result. <br /> MS % Recovery <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RPD Limit <br /> LCS # SB041596 SB041596 SB041598 <br /> Prepared Date 4/15/96 4/15/96 4/15/96 <br /> Analyzed Date 4/15/96 4/15/96 4/15/96 - <br /> Instrument I D # F4 F4 F4 <br /> Conic Spiked. 3300 Ng/Kg 3300 pg/Kg 3300pg/Kg <br /> LCS Result 2700 2100 2600 <br /> LCS %Recov 82 64 79 <br /> LCS 40-130 30-110 50-115 <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 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 3 of 3 9604850 TTT a5> <br />