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4D• Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N W Set lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916)925-9600 FAX(916)92t-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> r Vief-I� an-I�U�IIr1.. r_w i �,., <br /> y Client project ID Unocal 88#0187, Sto&fon}` y, <br /> 47 Sierra Court, Suite J Matrix Liquid } <br /> Dublin, CA 94568 ; <br /> Attention Deanna Harding QC Sample Group 9020651-668 Reported Feb <br /> p eby},s, 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# <br /> Date Prepared <br /> Date Analyzed _ <br /> Instrument I.D.# <br /> Conc Spiked <br /> Matrix Spike <br /> % Recovery <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery <br /> Relative % <br /> Difference: <br /> rrYBv rn ' nr .. rrr . r u ,. x rr nx n • wr ` 4 i + r yr r <br /> LCS Batch# 5LCS021199 SLCS021199 5LCS021199 5LCS021199 <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-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 95 95 98 96 <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 N <br /> Ithe 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 /> tne Fegley <br /> Project Manager <br /> 9020651 GET <25y <br /> m <br />