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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue 4, Suite LIVI @ Concord,California 94520 <br /> (510) 686-9066 • FAX (510) 686-9689 <br /> ............ <br /> . . ......... .......�:............ <br /> .......... ..... .... .... .. <br /> .................................... ...... <br /> Kapreafian' Engineering, Inc. Client 'r"%" -al, Stocton, 7303 Pacific Ave. <br /> Project ID: Unocal, <br /> P.O. Box 996 <br /> ' Benicia, CA 94510 <br /> Attention: Mardorealian, P.E. QC Sample Group: 109rt <br /> -2165 Reported: Oct 17, 1991 <br /> ..... ................ ...... <br /> .................... <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method: EPA 8010 EPA 8010 <br /> Analyst: M.N M.N <br /> Reporting Units: ug/L ug/L <br /> Date Analyzed: Oct io, 1991 Oct 10, 1991 <br /> Sample#: 109-2165 Blank <br /> Surrogate#1 <br /> %Recovery: 77 110 <br /> Surrogate#2 <br /> %Recovery: 100 120 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Cone.of Sample x 100 <br /> Spike Cone.Added <br /> Relative%Difference: Cone,of M.S.-Cone.of M.S.D. x 100 <br /> Belinda C. Vega (Cone.of M.S. + Cone.of M.S.D.) 2 <br /> Laboratory Director 1092165.KEI <8> <br />