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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 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 /> 10ttler-Ryan - Dublin Client Project ID Unocal SS#5098, Stockton <br /> ,47 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9031847-861 Reported Mar 29, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 9031848 9031848 9031848 9031848 <br /> Date Prepared 3 25 99 3/25/99 3/25/99 3/25,99 <br /> Date Analyzed 3/25 99 3/25/99 3/25/99 3/25199 <br /> Instrument I D # HP 9 HP 9 HP 9 HP 9 <br /> Conc Spiked 20 ug L 20Ng/L 20Ng/L 60Ng/L <br /> Matrix Spike <br /> % Recovery 90 105 105 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 100 105 103 <br /> Relative % <br /> Difference 00 4 9 00 00 <br /> LCS Batch# 9LCS032599 9LCS032599 9LCS032599 9LCS032599 <br /> Date Prepared 3/25/99 3/25/99 3/25/99 3/25/99 <br /> Date Analyzed 3/25/99 3/25/99 3/25/99 3/25/99 <br /> Instrument I D # HP 9 HP-9 HP-9 HP 9 <br /> LCS % <br /> Recovery 95 110 110 108 <br /> Recovery <br /> Control Limits 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 /> U (/ interference,the LCS recovery is to be used to vaildate the batch <br /> ianne Begley <br /> Project Manager <br /> 9031847 GET a6> <br />