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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 lD Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 04, 05 <br /> Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,2,4-Trlchloro- 4-Chloro-3- Acenaphthene 4-Nltrophenol <br /> benzene Methylphenol <br /> QC Batch# MSO414978720EXA MSO414978720EXA MSO414978720E(A MSO414978720EXA <br /> Analy. Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method: EPA$550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst. E Manuel E Manuel E Manuel E Manuel <br /> MS/MSD # 970474404 970474404 970474404 970474404 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 4/14/97 4/14/97 4/14/97 4/14/97 <br /> Analyzed Date: 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Instrument I D # F4 F4 F4 F4 <br /> Conc Spiked 3300pg/Kg 3300 Ng/Kg 3300 pg/Kg 3300pg/Kg <br /> Result 1400 2000 1800 1400 <br /> • MS % Recovery 42 61 54 42 <br /> Dup. Result. 1600 2300 2000 1600 <br /> MSD % Recov.: 48 70 61 48 <br /> RPD. 13 14 10 13 <br /> RPD Limit- 0-40 0-40 0-40 0-40 <br /> LCS # SB041797BS SB041797BS SB041797BS SE041797BS <br /> Prepared Date 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date. 4/17/97 4/17/97 4/17/97 4/17/97 <br /> Instrument l D.# F4 F4 F4 F4 <br /> Conc. Spiked 3300pg/Kg 3300,ug/Kg 3300pg/Kg 3300yg/Kg <br /> LCS Result. 2300 2200 2000 1600 <br /> LCS %Recov 70 67 61 48 <br /> LCS <br /> Control Limits 38-107 26-103 31-137 11-114 <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 /> I e, regory **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 2 of 3 9704512 EEE <7> <br />