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1�I' 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 404 N W,get Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue Sure 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)79Z 1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies 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 Phenol 2-Chlorophenol 1,4-Dichloro- N-Nitroso-Di- <br /> benzene N-propylamine <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 Conc 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 330Gpg/Kg 3300 pg/Kg 3300pg/Kg 3300frg/Kg <br /> Result 2180 2140 1900 2210 <br /> MS % Recovery 66 65 58 67 <br /> • Dup Result 2030 1980 1840 2070 <br /> MSD % Recov 62 60 56 63 <br /> RPD 71 78 32 65 <br /> RPD Limit 0-40 0-40 0-40 0-40 <br /> LCS # LCSO42298 LCS042298 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 Vg/Kg 3300 fig/Kg 3300 ug/Kg 3300 jig/Kg <br /> LCS Result 2480 2500 2490 2590 <br /> LCS % Recov 75 76 75 78 <br /> LCS <br /> Control Limits 26-90 25-102 28-104 41-126 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 0UOIASEQN LYTICAL 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 /> f repo y **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> ect Manager Page 1 of 3 9804C43 GET <3> <br />