ISSN:
1745-6584
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Energietechnik
,
Geologie und Paläontologie
Notizen:
Changing land-use patterns are occurring in all areas of the United States, especially those lands surrounding urban centers. Previously farmed land is being converted to residential subdivisions of one-quarter to one-half acre lots with on-site water supply and sewage disposal systems (well and septic). This in itself can present problems which are recognized and usually (now) provided for. There are also hazards resulting from the original uses of the land that have not been anticipated.This paper is concerned with the high nitrate nitrogen levels (U.S.P.H.S., 1962, Note 1) in ground water resulting from long-term farming. Natural chemical and biological activity will break down manure to persistent nitrate that is then leached into the water table. Subsequent subdivision of the land, well installation and consumption of the contaminated ground water constitutes a problem that has been medically recognized since 1945, but not by the drilling industry or environmental health personnel.Regulations of the Maryland State Department of Health and Mental Hygiene (Note 2) provide for a required series of bacteriological and chemical samples prior to the water supply being put into service. To date, the tests are usually conducted after occupancy, if at all. In Harford County, Maryland, at least four subdivisions have been shown to have areas of excessive nitrate nitrogen (up to 60 ppm) showing the need for stringent enforcement of existing regulations.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1745-6584.1977.tb03188.x
Permalink