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Sequoia 680 Chesapeake D,,,, Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 41) 404 N Wiset lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> fill>,) 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 /> *EIer-Ryan-6ublm "VCUent 'roject I0 'Unocal SS#0187;`$tockton' <br /> A 6747 Sierra Court, Suite J Matrix Liquid f; <br /> Dublin, CA 94568 n <br /> a{Attention Deanna Harding QC Sample Group 9020651-668 Reported Feb 16, 1999 ' <br /> �2�,+`"}t5. `v...,,.�r:;`w,e-.,,.i<ik H"., ,- .N..,,., ,. K.,,.x..,.,,�s,:.r,✓i,:t v`• � r . .... a �c w'y k v'v»o:w.e .. o o,. .,,,. «,.o.,,,. ..,.,,. ..,oma w v a.�...�wi/� +i <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#: 9020422 9020422 9020422 9020422 <br /> Date Prepared 2/11/99 2/11/99 2/11/99 2/11/99 <br /> Date Analyzed 2/11/99 2/11/99 2/11/99 2/11/99 <br /> Instrument LD # HP-2 HP-2 HP-2 HP-2 <br /> Conic Spiked 20ug/L 20pg/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 100 95 100 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 100 95 95 108 <br /> Relative% <br /> Difference 00 00 51 16 <br /> LCS Batch#- 2LCS021199 2LCS021199 2LCS021199 2LCS021199 <br /> Date Prepared: 2/11/99 2/11/99 2/11/99 2/11/99 <br /> Date Analyzed. 2/11/99 2/11/99 2/11/99 2/11/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 100 95 100 108 <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 K <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Interference,the LCS recovery Is to be used to validate the batch <br /> 111anne Fegley <br /> Project Manager <br /> 9020651 GET <24> <br /> m <br />