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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> a- 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 /> • <br /> Gettler Ryan/Geostrategies Client Project 1D 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' 2,4-Dlnitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# MSO416988270EXC MSO416988270EXC MSO416988270EXC <br /> Anally 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 Cone 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 /> Cone Spiked 3300 pg/Kg 3300 ug/Kg 3300 ug/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 /> RFD 49 14 3 0 <br /> RPD Limit 0-40 040 0-40 <br /> LCS # LCSO42298 LCSO42298 LCSO42298 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 <br /> Instrument 1 D # H5 HS H5 <br /> Cone. Spiked 3300 ug/Kg 3300ftg/Kg 3300ug/Kg <br /> LCS Result 2340 2130 2800 <br /> LCS % Recov 71 65 85 <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 /> 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 regory **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9804C43 GET ¢5> <br /> g� <br />