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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> reallan Engineering, Inc Client Project TD Farmer Unocal #5098, 5606 Pacific Ave <br /> 01 Stanwell Dr, Ste 400 <br /> Concord, CA 94520 <br /> Attention Avo Avedesslan QC Sample Group 3061150-53 Reported Jul 14, 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 Nil] K Nil] K Nill K Nill <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed Jul 8, 1993 Jul 9, 1993 Jul 8, 1993 Jul 8, 1993 Jul 8, 1993 <br /> Sample # 306-1150 306-1151 306-1152 306-1153 Blank <br />• <br /> Surrogate#1 <br /> % Recovery 130 101 123 95 130 <br /> Surrogate #2 <br /> % Recovery 129 102 127 113 120 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Gone of Sample x 100 <br /> -- Spike Conc Added <br /> Relative %Difference Cone of M S -Gone of M S D x 100 <br /> n emp (Conc of MS + Cone of M S D)/2 <br /> Project Manager <br /> 3061150 KEI <8> <br />