f MULTIPLE METHOD SUBSURFACE ANALYSIS OF A CLUTTERED INDUSTRIAL SITE TO DETERMINE LNAPL SOURCE AND MIGRATION PATHWAY

The site setting for this project is one often encountered by geophysicists; the need for detailed subsurface information at an active, cluttered industrial facility. The owner of the facility was addressing a release of LNAPL from bank seeps into a creek bounding the facility. The desired information was an understanding of the source of the oil and the pathways the oil was following to reach the creek. Prior attempts to understand the site conditions using soil borings and monitoring wells did not result in an acceptable concept of the site conditions. It was known that limestone bedrock was relatively shallow, on the order of 10 to 15 feet bgs, and the subsoils consisted of fill materials containing foundry sand, moulds, castings, paint wastes, and metal scrap. The area of interest was bounded by metal structures and numerous utilities were known to cross the area. In addition, the work area was a high traffic area.