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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 Crede.CA 94598 (925)988-9600 FAX(925)988-%73 <br /> Analytical 819 Str[ker Avernre Suite a Sacramento CA M34 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell 8ivd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ' 1551 Industnai Road San Carlos CA 94070 4111 (650)232-9600 FAX(650)232-9612 <br /> PEnvironmental Resolutions Client Project ID Unocal 5098/227903 <br /> 74 Digital Drive, Ste 6 Matrix Solid <br /> Novato, CA 94949 <br /> Attention Mark Dockum Work Order# 99E+100 01. 02 Reported Mar 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ' Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch#: SP02OM8020EXA SP0209998020EXA SP0209998020EXA SP0209998020EXA SP02099998020EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 9020276 9020276 9020276 9020276 9020276 <br /> Sample Conc N D NO N D NO NO <br /> Prepared Date, 2/9/99 2/9/99 2/9/99 2/9/99 2/9/99 <br /> Analyzed Date 2/9/99 2/9/99 2/9/99 2/9/99 2/9/99 <br /> Instrument I.D # HP4 HP4 HP4 HP4 HP4 <br /> Come Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 14 mg/Kg <br /> Result 097 0 a5 092 31 13 <br /> MS % Recovery 121 106 115 129 93 <br /> Dup Result 11 092 097 33 13 <br /> MSD % Recov 138 115 121 138 93 <br /> RPD 13 79 53 62 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br />' LCS # LCS020999 LOS020999 LCS020999 LCS020999 LCS020999 <br /> Prepared Date 2/9/99 2/9/99 2/9/99 2/9/99 2/9/99 <br /> Analyzed Date 2/9/99 2/9/99 2/9/99 2/9/99 2/9/99 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 14 mg/Kg <br /> LCS Result 94 079 081 27 12 <br /> LCS % Recov . 118 99 101 113 - 86 <br /> LCS 50-150 50-150 50-150 50-150 50-150 <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 /> ELAP#1271 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 /> Mer N#e hln <br />' Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative %Difference REPORT XLS <I;,- <br />