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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (925)988 9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)79Z-1865 FAX(707)792-0342 <br /> ettler-Ryan - Dublin Cl lent Protect ID Unocal SS#5886, Stockton <br /> 747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding CC 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# 9030238 9030238 9030238 9430238 <br /> Date Prepared 3/9,99 3/9/99 3/9/99 3/9/99 <br /> Date Analyzed 319/99 3/9/99 3/9/99 3/9/99 <br /> Instrument I ❑ # HP 2 HP 2 HP 2 HP 2 <br /> Cone Spliced 20 Ng L 20ug/L 20pg/L 60,ug/L <br /> Matrix Spike <br /> -. Recovery 105 too toy 112 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 80 75 80 88 <br /> Relative% <br /> Difference 27 29 27 23 <br /> LCS Batch# 2LCS030999 2LC8030999 2LCS030999 2LC8030999 <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-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 110 100 105 113 <br /> % ecovery <br /> Control Limits 70 130 70 130 70-130 70-130 <br /> Piease 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 /> LAI 0.(, the recovery of analytes from the matrix spike does not fall within specifled control limits due to matrix <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Itulianne Fegley <br /> ct Manager <br /> 9030233 GET <17> <br />