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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> l Sequoia 404 N Wlget Lane Walnut Geek,CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Stoker Avenue Suite 8 Sacramento CA 9%U (9 16)921-9&00 FAX(916)921-0i0o <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-961 Z <br /> v? .. v 4 i'^' S+"'-" vC i+v^' C`'+-`5 Y-rvw M Y v a4 C5n r ♦ n-yK <br /> rub[in,,CA <br /> yan- Dublin V µ'� ---Client project lb 'µ Unocal 88#5098,Stockton <br /> ra Court,Suite J Matrix Liquid £ <br /> 94568 <br /> Deanna Harding OC Sample Group 9061562-579 Reported Jun 30, 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 J Minkel J Minkel J Minkel J Winkel <br /> MS/MSD <br /> Batch# 9062599 9062599 9062599 9062599 <br />,Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/25/99 <br /> strument I D # HP-5 HP-5 HP-5 HP 5 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 90 90 90 93 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 105 110 115 117 <br /> Relative% <br /> Difference 15 20 24 22 <br /> LCS Batch# 5LCS062599 5LCS062599 5LCS062599 5LCS062599 <br /> Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 5/25/99 6/25/99 6/25/99 <br />�strument I D # HP 5 HP 5 HP 5 HP 5 <br /> LCS. % <br /> Recovery 95 100 95 102 <br /> Recovery <br /> Control Limits 70 130 70-130 70-130 70-130 <br /> t — <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> EQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> I' fortified with known quantities of specific compounds and subjected to the entire analytical procedure—If - <br /> S.c a!� rt tiL the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> 1lanne Fegley <br /> project Manager � <br /> 9061562 GET <11> <br /> 1 <br />