The final sentence in this paragraph does not acknowledge that almost no data exists regarding the vertical distribution of NAPL in the refinery site and that almost none of the subsurface of the interior of the refinery has been characterized. This conclusion is premature and cannot be supported with data since areas where most of the NAPL is present have not been characterized. Please add more detail to this bullet. Please add more detail to this bullet. The data and sources which are relied on to make the statement that sheet-pile walls are subject to leakage are 38 and 22 years old.
Technology exists now for reducing leakage through joints.
Oil below the water table has been found beyond the interceptor trench next to the river. Extensive characterization has not been conducted to determine the extent of NAPL beyond the trench. Page 31, It would make the answer more complete if the terms in the differential equations on this page were defined.