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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)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 /> Y 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> • <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A13-01 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,2,4-Trichlorc- 4-Chloro-3- Acenaphthene 4-Nrtrophenol <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 Cone ND ND N D ND <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 /> Cone Spiked 3300yg/Kg 3300 jig/Kg 3300frg/Kg 3300Ng/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 0-40 040 0-40 0-40 <br /> LCS # LCSO41698 LCSO41698 LCSO41698 LCSO41698 <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 HS H5 <br /> Cone Spiked 3300 fig/Kg 3300 ug/Kg 3300 fug/Kg 3300 pg/Kg <br /> LCS Result 1860 1960 1660 2010 <br /> LCS % Recov - 56 59 50 61 <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 1s analyzed using the same reagents, <br /> SSQUO A ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantotles 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 /> l interference,the LCS recovery 1s to be used to validate the batch <br /> egory MS=Matrix Sp1ke, MSD=MS Duplicate,RPD=Relative%Difference <br /> Fi` ct Manager Page 2 of 3 9804A13 GET <4> <br />