The dewatering operation is not a potential source of groundwater contamination. Surface water impacts are discussed in Chapter 6731 Groundwater Protection . Protection of water quality depends on well design and the methods and materials used to construct and maintain the well. Deficiencies in a groundwater protection program could result from insufficient well casings, inadequate seals between the well casing and the borehole, poor welding at casing joints, or lack of protection at the wellhead. Migration of chemicals in the underground or above ground environment may affect groundwater quality.
Wastes accumulated include spent solvents, degreasers, and etchants.
Shielding blocks with any measurable level of radioactivity are stored in secure areas that minimize exposure to environmental, as well as public health, pathways. These items exist on the site, but have been characterized as having minimal potential to contaminate the groundwater. There are no known waste tanks, surface impoundments, or land treatment facilities located on or near the Jefferson Lab site. Potential sources of contamination from beyond site boundaries may include septic tank system effluent, pesticide runoff, leaking underground gasoline tanks, and improperly disposed of chemical or oil residues, though none have been noted to date. Low levels of groundwater contamination, apparently fuel products, have been noted on the SURA property.