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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 /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707 792-1865 FAX(707) 792 0342 <br /> is <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 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# MSO416988270EXC MSO416988270EXC MSO416988270EXC <br /> Analy Method. EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 <br /> Analyst B Pitamah B Pitamah B Pitamah <br /> MS/MSD # 9804A1301 9804A1301 9804A1301 <br /> Sample Conc N D N D N D <br /> Prepared Date- 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date 4/17/98 4/17/98 4/17/98 <br /> Instrument I D #: H5 H5 H5 <br /> Conc Spiked 3300 pg/Kg 3300 jig/Kg 3300 Vg/Kg <br /> Result 2090 2430 2390 <br /> MS % Recovery 63 74 72 <br /> Dup Result 1990 2120 2320 <br /> MSD % Recov 60 64 70 <br /> RPD 49 14 30 <br /> RPD Limit 040 0-40 0-40 <br /> LCS # LCSO41698 LCSO41698 LCSO41698 <br /> Prepared Date. 4/16/98 4/16/98 4/16/98 <br /> Analyzed Date 4/17/98 4/17/98 4/17/98 <br /> Instrument I D # H5 H5 H5 <br /> Conc Spiked 3300,ug/Kg 3300 pg/Kg 3300 ug/Kg <br /> LCS Result 1710 1880 1970 <br /> LCS % Recov 52 57 60 <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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br />'07the 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 /> regory **MS-Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> P oject Manager Page 3 of 3 9804A13 GET <5> <br />