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680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wlget Lane W tlnut Creek CA 94598 (510)988 9600 FAX(510)986 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(9 16)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1665 FAX(707)792-0342 <br /> i <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 5421, 140162 02 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804C43-03 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,2,4-Tnchtoro- 4-Chloro-3- Acenaphthene 4-Nitrophenol <br /> benzene Methylphenol <br /> QC Batch,# MSO416988270EXC MSO416988270EXC MSO416988270EXC MSO416988270EXC <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method. EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst B Pitamah B Pitamah B Pitamah B Pitamah <br /> MS/MSD #- 9804A1301 9804A1301 9804A1301 9804A1301 <br /> Sample Conic N D N D N D N D <br /> Prepared Date 4/16/98 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date- 4/17/98 4/17/98 4/17/98 4/17/98 <br /> Instrument I D.# H5 H5 H5 H5 <br /> Conc Spiked 3300 ug/Kg 3300 ug/Kg 3300 ug/Kg 3300 jig/Kg <br /> Result 2230 2330 1940 2340 <br /> MS % Recovery 68 71 59 71 <br /> Dup Result 2080 2200 1860 2250 <br /> MSD % Recov 63 67 56 68 <br /> RPD 70 57 42 39 <br /> RPD Limit 0-40 0-40 0-40 0-40 <br /> LCS # LCSO42298 LCSO42298 LCSO42298 LCSO42298 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Instrument I D # H5 H5 H5 H5 <br /> Conc Spiked 3300 ug/Kg 3300ug/Kg 3300 ug/Kg 3300ug/Kg <br /> LCS Result 2730 2700 2220 2420 <br /> LCS% Recov 83 82 67 73 <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 /> •SEQUOWrojectrLManray"ager <br /> p,AALYTICAL 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 /> o **MS=Matrix Spike,MSD=MS Duplicate,APD=Relative%Difference <br /> Page 2 of 3 9804C43 GET <4> <br />