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brought .to grade within the bucket of the backhoe bucket . ` After removing the top few inches of soil from the portion - of the bucket to be sampled, a 1 . 9 inch diameter by 6 . 0 inch long clean brass tube was driven into the soil until it was completely filled with material. The tube was then withdrawn and its ends covered with aluminum foil , fitted with plastic cap=s , and seal-ed with duct tape . Each tube was then labeled and placed into an iced, insulated container for transportation to Priority Environmental Labs . of Milpitas under chain of custody . Certified analyses were subsequently performed for Total Petroleum Hydro- carbons as as Diesel- (TPH-D) using EPA Methods 3550/8015 , Total Petroleum Hydrocarbons as Gasoline (TPH-G) , benzene, toluene, .ethylbenzene , and total xylenes (BTEX) using EPA Methods 5030/8015-8020 , and Oil and Grease (TOG) using SM 5520 D&F. The results of these analyses are summarized in the following table : . Table 3 Analytical Results o:f Soil Samples Acquired from Exploratory Trenches Excavated on February 22 , 1994 275 Grant Line -Road, Tracy , CA Sample Date & .Depth of TP.H-D - TPH-G B T E X TOG Sample ( ft ) (ppm) (ppm) (ppm) (ppm) Bldg Tr/8 . 5 N . D . N . D . N . D. - N. D. -- .N. D. N. D . 13 BT North/8 ' N. D. N . D. N . D . N . D . N . D . N . D . N . D . BT Center/3 ' N. D. N. D. N .D.. N . D. - N . D . N. D. N . D. BT Center/8 ' N . D. N . D . N.D. N . D . N .D. -N . D . N . D . BT South/8 ' N . D .- N. D . N . D. N . D . N. D. N . D . 91 ------- ----------- -- . ---------_ Method Detection 1 . 0 1 . 0 5 . 0 5 . 0 5 . 0 5 . 0 10 Limit Bldg Tr . . . Building Trench TPH-D. . .. Total Petroleum Hydrocarbons 'as Diesel TPH-G. . . Total Petroleum Hydrocarbons as Gasoline BTEX. .. . Benzene, toluene, ethylbenzene , total xylenes TOG . . . Total Oil and Grease ppm. . . Parts per million ppb . . . Parts per billion (1 ppm' = 1 , 000 ppb) Page 6