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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N WiSet Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Iwo 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 /> iftttler-Ryari - Dublin Client Project ID Unocal SS#5886, Stockton <br /> 47 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 C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 9030131 9030131 9030131 9030131 <br /> Date Prepared 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 31'9/99 3/9/99 <br /> Instrument I D # HP 9 HP 9 HP 9 HP 9 <br /> Conc Spiked 20mg/1- 20pg/L 20pg/L BDug/L <br /> Matrix Spike <br /> % Recovery 110 110 110 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 105 105 107 <br /> Relative % <br /> Difference 4 7 47 47 1 8 <br /> LCS Batch# 9LCS030999 9LCS030999 9LCS030999 9LCS030999 <br /> Date Prepared 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 3/9/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I D # HP-9 HP-9 HP 9 HP-9 <br /> LCS % <br /> Recovery 1110 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 /> j`(.. the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> fla'nne Fegley <br /> Project Manager <br /> 9030233 GET <19> <br />