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4 } r ~{ 1 y <br /> SequoSeLLQ�a 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> ia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> IIlO Analytiea 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ttler-Ryan - bublln Client Project ID Unocal 88#5417, Manteca <br /> 47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9022174-177 Reported Mar 10, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Westwater C Westwater C Westwater C Westwater N Nelson <br /> MS/MSD <br /> Batch# 9022175 9022175 9022175 9022175 9022175 <br /> Date Prepared 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Date Analyzed 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 GC/MS-2 <br /> Conc Spiked 20Ng/L 20pg/L 20yg/L 60ug/L 50pg/L <br /> Matrix Spike <br /> % Recovery 100 90 90 107 114 <br />. Matrix Sptke <br /> Duplicate <br /> Recovery 100 90 90 105 110 <br /> Relative % <br /> Difference 00 00 00 1 6 3 6 <br /> LCS Batch# 4LCS030499 4LC3030499 4LCS030499 4LCS030499 LCS030599 <br /> Date Prepared 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Date Analyzed 3/4/99 3/4/99 3/4/99 3/4/99 3/5/99 <br /> Instrument I Dom�++# HP-4 HP-4 HP 4 HP 4 GC/MS-2 <br /> LCS % <br /> Recovery 100 90 95 107 110 <br /> Recovery <br /> Control Limits 70 130 70-130 70-130 70-130 70-130 <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 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 /> Ilartne Fegley A147 1 <br /> interference,the LCS recovea is to be used to validate the batch <br /> Project Manager <br /> 9022174 GET <5> <br />