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Sequoia 650 ChcSIPCAe C)nve Redwood City CA 94063 (415) 3aj 9600 FAX (40) 364 9233 <br /> 404 N Wigct Lane Waln t Creek CA 94599 (510} 955 9600 FAX(5 10) 985 9673 <br /> Analytical 819 Striker Avenue Suuc 8 Sacramernto CA 95834 (910 921 9600 FAX(916) 921 0100 <br /> Environmental Resolutions Client Project ID Unocal 5886, 205503 <br /> 74 Digital Drive, Ste 6 Matrix Solid <br /> Novato CA 94949 <br /> Attention Keith Romstad Work Order # 9704614 0204 Reported May 2, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Oiesel <br /> QC Batch# GC0423970HBPEXA <br /> Analy Method EPA 8015M <br /> Prep Method EPA 3550/DHS <br /> Analyst B Sullivan <br /> MS/MSD # 9704B1202 <br /> Sample Conc 25 <br /> Prepared Date 4/23/97 <br /> Analyzed Date 4/24/97 <br /> Instrument f D # GCHP4B <br /> Conc Spiked 25 mg/Kg <br /> Result <br /> MS % Recovery <br /> Dup Result <br /> MSD % Recov <br /> APD <br /> RPD Limit <br /> *Matrix effect <br /> LCS # BLK042397S <br /> Prepared Date 4/23/97 <br /> Analyzed Date 4/24/97 <br /> Instrument 1 D # GCHP4B <br /> Conc Spiked 25 mg/Kg <br /> LCS Result 17 <br /> LCS % Recov 68 <br /> 50 150 <br /> LCS 60-140 <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 /> 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 It <br /> the recovery of analytes from the matrix spike does not fall within specrfied control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Kevin Follett <br /> Project Manager "*MS=Matrix Spike MSD=MS Duplicate, RPO=Relative a Difference 97041314 EEE <2> <br />