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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 /> 11to- <br /> Oettler-kyan Client Project ID UNOCAL #5421-Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94,568 <br /> Attention Clyde Galantine QC Sample Group 8041418-420 Reported Apr 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Diesel Oil and <br /> Benzene Grease <br /> QC Batch# SP042298 SP042298 SP042298 SP042298 SP042298 SP042398 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8015EXA 5520EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M SM 5520 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3550 SM 5520 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb K Grubb N Van Slambrook <br /> MS/MSD # 8041179 8041179 8041179 8041179 8041420 8041420 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 4/23/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 4/23/98 <br /> Instrument i D # HP-2 HP 2 HP-2 HP 2 HP-3A Manual <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 15 mg/kg 5000 mg/kg <br /> Result 070 069 069 21 14 5900 <br /> MS % Recovery 88 86 85 88 93 118 <br /> Dup Result 077 077 075 22 13 6100 <br /> MSD % Recov 96 96 94 92 87 122 <br /> RPD 95 11 83 47 74 33 <br /> RPD Limit 020 0-20 0-20 0-20 0-50 0-30 <br /> LCS # 2LCSO42298 2LCSO42298 2LCSO42298 2LCSO42298 LCSO42298 LCSO42398 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 4/23/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 4/23/98 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 HP-3A Manual <br /> Conc Spiked 20pg/L 20pg/L 20yg/L 60ug/L 15 mg/kg 5000 mg/kg <br /> LCS Result 21 20 21 62 15 4700 <br /> LCS % Recov 105 100 105 103 100 94 <br /> LCS 50150 50-150 50-150 50-150 60140 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, #1271 preparation,and analytical methods employed for the samples The matrix spoke 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 /> mp / **MS=Matrix Spoke, MSD=MS Duplicate, RPD=Relative%Difference <br /> Labora bt ry erector <br /> L� 804141 B GET <10> <br />