''Effects
of Human Activities on the Interaction of Groundwater and Surface
Water" - USGS Circular 1139
Reviews the effects agricultural development, urban and industrial
development, drainage of the land surface, modifications to river
valleys, and modifications to the atmosphere have on groundwater
and surface water, including pollution and disturbance of flow
paths. Site includes several color images. Includes links to case
studies on the effects of irrigation, nitrate contamination, pesticide
application, the increase of water levels in surface reservoirs,
vegetation removal, and acid rain on water reservoirs.
"Arsenic
in Groundwater Resources of the United States" - USGS
Fact Sheet 063-00
This site discusses arsenic concentrations in potable water across
the U.S. Includes a map that shows arsenic concentrations in groundwater
of the United States.
"Ground
Water Studies" - USGS Fact Sheet 058-95
Contains a review of the threats to our nation's water supply
and the steps the USGS is taking to minimize the effects of natural
hazards and environmental damage caused by human activities on
groundwater supplies.
"National
Field Manual for the Collection of Water Quality Data"
- USGS
Online publication contains links that describe the basic techniques
of water resource investigations, including water sampling. Click
on links to open table of contents for a chapter on the particular
technique. One chapter is devoted to preparations for water sampling,
including tips on materials to take into the field, tips on field
trip responsibilities, and advice on how to select sampling sites.
There is is also a chapter that reviews the techniques involved
in the actual process of collecting water samples.
"Current
Drinking Water Standards" - EPA
Table outlines the EPA's standards for safe drinking water, defining
levels of contaminants and listing possible sources of these contaminants.
"San
Francisco Bay Program: Lessons Learned for Managing Coastal Water
Resources" - USGS
Fact sheet reveiws how USGS research helped to gain a greater
understanding of how humans and water use in a coastal area affected
the ecosystem and steps the USGS has implemented to reduce human
impacts in the Bay area.
