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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Enviros Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 1 04, 05 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch#` MSO414978720EXA MSO414978720EXA MSO414978720EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 <br /> Prep. Method EPA 3550 EPA 3550 EPA 3550 <br /> Analyst E Manuel E Manuel E Manuel <br /> MS/MSD #. 970474404 970474404 970474404 <br /> Sample Conc . N D N D N D <br /> Prepared Date 4/14/97 4/14/97 4/14/97 <br /> Analyzed Date 4/15/97 4/15/97 4/15/97 <br /> Instrument I D #- F4 F4 F4 <br /> Conc. Spiked. 3300 Mg/Kg 3300pg/Kg 3300pg/Kg <br /> Result: 2200 1700 1700 <br />. MS %Recovery• 67 52 52 <br /> Dup. Result. 2600 1600 1800 <br /> MSD % Recov 79 48 54 <br /> RPD 17 61 57 <br /> RPD Limit* 0-40 0-40 040 <br /> LCS # SB041797BS S6041797BS SB041797BS <br /> Prepared Date. 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date 4/17/97 4/17/97 4/17/97 <br /> Instrument I D # F4 F4 F4 <br /> Conc. Spiked. 3300 pg/Kg 3300 Ng/Kg 3300 Ng/Kg <br /> LCS Result 2300 1200 2200 <br /> LCS % Recov .. 70 36 67 <br /> LCS <br /> Control Limits 28-89 17-109 35-142 <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 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 1s to be used to validate the batch <br /> 1 regory **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9704512 EEE <8> <br />