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l SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 401 Stanwell Dr. Ste 400 <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 3091460-1463 Reported Oct 13, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill K Nill K Nill <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed Oct 11, 1993 Oct 11, 1993 Oct 11, 1993 Oct 11 1993 Oct 11 1993 <br /> Sample # 309-1460 309-1461 3091462 309-1463 Matrix Blank <br /> i <br /> Surrogate#1 <br /> % Recovery 124 123 129 126 125 <br /> Surrogate #2 <br /> % Recovery 115 114 114 117 116 <br /> EQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> Gone� Difference Cone of MS Cone of M S D x 100 <br /> Alan B Kemp �/ ' (Cont of M S + Cork of M S D)/2 <br /> Project Manager 3091460 KEI <8> <br />