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,!TN Sequoia 680 Chesapeake Disve Redwood City CA 94063 (650)364 9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane W tlnut Creek CA 94598 (510)988 9600 FAX(510)988 9673 <br /> �na1�tlCa� 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916)92l-9600 FAX(916)921 0100 <br /> Awa 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> i <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 Total Recoverable <br /> Petroleum Hydrocarbons <br /> QC Batch# SP042298552000A <br /> Analy Method SM 5520EF <br /> Prep Method SM 5520EF <br /> Analyst W Loo <br /> MS/MSD # 9804A3302 <br /> Sample Cone N D <br /> Prepared Date 4/21/98 <br /> Analyzed Date 4/22/98 <br /> Instrument I D # MANUAL <br /> Cone Spiked 150 mg/Kg <br /> Result, 170 <br /> MS % Recovery 110 <br /> • Dup Result- 150 <br /> MSD % Recov 100 <br /> RPD 13 <br /> RPD Limit 0-30 <br /> LCS # LCSO42198 <br /> Prepared Date 4/21/98 <br /> Analyzed Date 4/22/98 <br /> Instrument 1 D # MANUAL <br /> Cone Spiked- 150 mg/Kg <br /> LCS Result 134 <br /> LCS % Recov • 89 <br /> 50-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQU 1,A 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 /> gory <br /> interference,the LCS recovery is to be used to validate the batch <br /> Pro <br /> i J <br /> `� eft Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9804C43 GET <7> <br />