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68o Chesapeake Drive Redwood City CA 94063 <br /> Sequoia 404 N Wget Lane Walnut Creek.CA 94598 (650)364-9600 FAX{650)364-9633 <br /> (425)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 /> Gettler-Ryan - Dublin Client Project ID Unocal SS#5886, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding OC Sample Group 9030233-244 Reported Mar 24, 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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9030144 9030144 9030144 9030144 <br /> Date Prepared 3/8/99 3/8/99 3/8,99 3 8/99 <br /> Date Analyzed 3/8/99 3/8/99 318I99 3/8/99 <br /> Instrument I D # HP 9 HP 9 HP 9 HP-9 <br /> Conc Spiked 20l19/L 20Ng/L 20F+grL 60ug/L <br /> Matrix Spike <br /> % Recovery 110 115 115 113 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 115 115 113 <br /> Relative % <br /> Difference 00 00 00 00 <br /> LCS Batch# 9LCS030899 9LCS030899 9LCS030699 9LCS030899 <br /> Date Prepared 3/8/99 3/8/99 3/8/99 3/8/99 <br /> Date Analyzed 3/8/99 3/8/99 3/8/99 3/8/99 <br /> Instrument I�+D # HP 9 HP-9 HP 9 HP-9 <br /> LCS % <br /> Recovery Ito 115 110 110 <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 mterterent 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 o1 sample <br /> M� ! fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> •v the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryIs to be used to validate the batch <br /> tianne Fegley ject Manager <br /> 9030233 G ET <18> <br />