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Sequoia 600 Chesapeake Drive Redwood City CA 94063 (650)364-9600 rAx(650)364-9233 <br /> 404 N Wlget lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> I� Analytical nu <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 Mcfloweli Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ettler-Ryan - Dublin Client Project ID Unocal SS#5886, Stockton <br /> 747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9030233-244 Reported Mar 24, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA 8260 <br /> Analyst J Minkel J Minkel J Minkel J Minkel K Gruab N Nelson <br /> MS/MSD <br /> Batch# 9030368 9030368 9030368 9030368 BLK030:998 9031104 <br /> Date Prepared 3/10/99 3/10/99 3/10/99 3/10/99 3,4,99 3/14/99 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/10/99 3/8,99 3114/99 <br /> Instrument I D # HP 2 HP 2 HP 2 HP-2 HP 38 GC/MS 2 <br /> Conc Spiked 20 yg/L 20 Ng/L 20 wg/L 60 fig/L SCO ug 1L 50 ug/L <br /> Matrix Spike <br /> % Recovery 100 95 100 102 82 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 95 102 74 98 <br /> Relative% <br /> Difference 61 54 51 00 10 100 <br /> LCS Batch# 2LCS031099 2LCS031099 2LCS031099 2LCS031099 LCS03C499B L-CS031499 <br /> Date Prepared 3/10/99 3/10/99 3/10/99 3/10/99 3/4/99 3/14/99 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/10/99 3/8/99 3/14/99 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 HP 38 GC/MS 2 <br /> LCS % <br /> Recovery 100 95 100 108 86 102 <br /> % ecovery <br /> Control Limits 70-130 70.130 70-130 70-130 60-140 70-130 <br /> Please Note <br /> The LGS 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 spike is an aliquot of sample <br /> fortified with known quantittes of specific compounds and subjected to the entire analytical procedure If <br /> (qlt 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 /> #ullanne Fegley <br /> Project Manager <br /> 9030233 GET <20> <br />