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Sequoia 680 Chesapeake Drive Redwood Ctry 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 /> • <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# 9804Al2-01 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Recoverable <br /> Petroleum Hydrocarbons <br /> QC Batch# SP041398552000A <br /> Analy Method SM 5520EF <br /> Prep Method SM 5520EF <br /> Analyst P Cheung <br /> MS/MSD # 980461302 <br /> Sample Conc N D <br /> Prepared Date- 4/13/98 <br /> Analyzed Date 4/14/98 <br /> Instrument 1 D #• MANUAL <br /> Conc Spiked 150 mg/Kg <br /> Result 62 <br />. MS % Recovery 41 <br /> Dup Result 100 <br /> MSD % Recov 67 <br /> RPD 47 <br /> RPD Limit 0-30 <br /> LCS # LCSO41698 <br /> Prepared Date 4/16/98 <br /> Analyzed Date 4/17/98 <br /> Instrument I D # MANUAL <br /> Conc Spiked. 150 mg/Kg <br /> LCS Result 137 <br /> LCS % Recov 91 <br /> s0-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SEQUOIAA ALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the enure 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 1s to be used to validate the batch <br /> regory <br /> Pr`olect <br /> tManager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9804Al2 GET <2> <br />