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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 40b N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 8t9 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> a- ) <br /> Analytical 1455 McDowell Blvd North Ste 0 Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ar—r-pyan-i5ubitn' Cllent Pra'ect it) Tosco (Unocal) SS#6981,}Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> -Attention Deanna Harding OC Sample Group 9011960-973 Reported Feb 18, 1999 <br /> } <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# 9011957 9011957 9011957 9011957 <br /> Date Prepared 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Date Analyzed 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Instrument I D # HP 9 HP-9 HP 9 HP-9 <br /> Conc. Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 95 95 95 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 100 102 <br /> Relative % <br /> Difference 00 0 0 51 1 7 <br /> LCS Batch#- 9LCS020599 9LCS020599 9LCS020599 9LCS020599 <br /> I <br /> Date Prepared, 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Date Analyzed 2/5/99 2/5/99 2/5/99 2/5/99 <br /> Instrument LD # HP-9 HP-9 HP 9 HP-9 <br /> LCS % <br /> Recovery. 95 100 100 105 <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 /> 5 OUOIA ANALYTICAL,#12771 preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of sample <br /> fortifled with known quantities of specific compounds and subjected to the entre analytical procedure ff <br /> 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 klatch <br /> J Ilanne Fegley <br /> Project Manager <br /> 90119WGEr <19> <br />