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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4t5) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker 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 /> OC 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 S8041596 SB041596 SB041596 <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 /> Conc. Spiked 3300pg/Kg 3300 pg/Kg 3300 pg/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 />• <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 /> i 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 <5> <br />