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� Page 6 and "L" represents the distance between these two extreme contours . In this case L = 47 . 5 feet . i = h/L = 52 . 88 ' - 52 . 75' = 0 . 12 ' = 0 . 002525 ft/ft 47 . 5 ' 47 . 5 ' The direction of groundwater flow was determined by drawing a line perpendicular to the groundwater contours establish- ed as described. Flow direction is expressed as the angle in degrees between North and the direction of groundwater flow. On March 31 , 1995 , the groundwater was found to be flowing N-720 -E. Maintenance, Removal , and Treatment of Previously Excavated Soil Containing Oil and Grease EPM has continued to monitor the soil storage piles maintained on site to assure that the polyethylene sheeting covers remain intact . New sheeting has been placed over the soil as necessary. Nhftool On February 27 , 1995 , EPM submitted additional written information concerning the removal and treatment of the subject soil to PHS/EHD. Mr. Infurna subsequently advised that this information satisfied his requirements for establishment of a public notification and comment period, which is now under way. ENVIRONMENTAL COMPLIANCE ACTIVITIES SCHEDULED FOR THE NEXT QUARTER Soil and Stored Puree Water EPM expects to bioremediate the 40 cubic yards of soil excavated at 275 Grant Line site on February 22 , 1994 after moving it to 2350 -East Street at the end of the public notification period prescribed by PHS/EHD. It is expected that the treatment period will not exceed 60 days . EPM has also requested PHS/EHD approval to dispose of the monitor- ing well purge water generated at both the Grant Line and East Street sites by treating it in an aerobic bioreactor- the design of which was described in the aforementioned documents dated February 27 , 1995 . Groundwater As shown in Table 1 , groundwater samples acquired from .on- site monitoring wells MW-1 and MW-3 have been free of