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further downward movement must overcome the upward capillary forces In clayey soils , these upward forces are significant In such cases , light , non-aqueous phase liquid (LNAPL) contaminants will form a dome ( i a mound) over the capillary fringe until the thickness of the LNAPL exerts sufficient downward pressure to overcome the upward, capillary force Until such time as this occurs , lateral migration will occur under most circumstances When Resna advanced their soil borings SB-9 and SB-10 between the underground fuel storage tank pit and the product line during April of 1991 , they acquired soil samples that were free of TPH contamination Borings SB-7 and SB-8 , advanced at northwest corner , and north central locations were also free of TPH , however , when EPM angered EP-1 , EP-2 , EP-3 , and EP-4 during March of 1994 , both soil and groundwater beneath the sidewalk 3ust north of the site were found to be contaminated ENVIRONMENTAL COMPLIANCE ACTIVITIES SCHEDULED FOR THE NEXT UAQ__RTER 1 ) The three soil borings previously requested by PHS/EHD will be advanced beyond the eastern boundary of the site (east of the former underground fuel storage tank pit ) in accordance with the permit previously issued This work is tentatively scheduled to be performed on July 14-15 , 1994 2 ) Approval for exploratory trenching on site will be sought from PHS/EHD Trenching will be performed along the northern site boundary , along the former product lines between the two pump islands , in the immediate area of MW- 2 , and south of the southernmost pump island to determine the extent of any residual contamination in these areas If approved, the trenches will be advanced to groundwater Discrete soil samples and grab water samples will be acquired from the excavations and submitted for certified laboratory analyses for Total Petroleum Hydrocarbons as Diesel (TPH-D) , Total Petroleum Hydrocarbons as Gasoline (TPH-G) , benzene , toluene , ethylbenzene , and total xylenes (BTEX) If heavy oils are encountered, as in soil boring EP-1 advanced in the sidewalk 3ust north of the site during March, 1994 , additional analyses will be performed in an effort to identify and quantify this material 3 ) A workplan will be submitted to PHS/EHD prior to August 1 , 1994 seeking permission to move 40 cubic yards of previously excavated soil from 275 Grant Line Road to 2360 East Street for the purpose of aerobically biodegrading fuel hydrocarbons contaminating a portion of the 40 cubic yards of soil The property at 275 Grant Line Road is located across the street from 2360 East Street and is also Page 12