United States Geological Survey YearbookThe Survey, 1993 - Forest reserves |
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Page 42
... nitrate in streams were similar to levels measured in previ- ous years . The concentrations at all sites were well below the drinking - water stand- ard of 10 parts per million of nitrate . The large total loads of nitrate flushed into ...
... nitrate in streams were similar to levels measured in previ- ous years . The concentrations at all sites were well below the drinking - water stand- ard of 10 parts per million of nitrate . The large total loads of nitrate flushed into ...
Page 56
... Down- ward trends in nitrate deposition were also preponderant but were statistically significant at only three stations . Trends Normal range of precipitation pH ACID ALKALINE NEUTRAL Strong acids 56 At Work Across the Nation . . .
... Down- ward trends in nitrate deposition were also preponderant but were statistically significant at only three stations . Trends Normal range of precipitation pH ACID ALKALINE NEUTRAL Strong acids 56 At Work Across the Nation . . .
Page 58
... nitrate , as nitrogen Fecal coliform bacteria 1 2 3 4 5 6 7 8 9 10 SITE NUMBER 0.01 0.01 0.001 10 1 2 3 4 5 6 7 8 9 10 SITE NUMBER Total phosphorus , as phosphorus 1 2 3 4 5 6 7 8 9 10 SITE NUMBER Water quality of selected streams in ...
... nitrate , as nitrogen Fecal coliform bacteria 1 2 3 4 5 6 7 8 9 10 SITE NUMBER 0.01 0.01 0.001 10 1 2 3 4 5 6 7 8 9 10 SITE NUMBER Total phosphorus , as phosphorus 1 2 3 4 5 6 7 8 9 10 SITE NUMBER Water quality of selected streams in ...
Page 59
... nitrate , 1980-89 Trends in water quality of selected streams in Arkansas , by water years ( data from USGS and Arkansas Department of Pollution Control and Ecology files ) . Total ammonia , 1980-89 State Water Resources Research ...
... nitrate , 1980-89 Trends in water quality of selected streams in Arkansas , by water years ( data from USGS and Arkansas Department of Pollution Control and Ecology files ) . Total ammonia , 1980-89 State Water Resources Research ...
Page 42
... existing and newly Frederic H. Nichols has participated in USGS studies of San Francisco Bay since 1972 . Nitrate in the South Platte River Alluvial Aquifer , Colorado 42 Touching the Lives of Every Citizen Every Day ......
... existing and newly Frederic H. Nichols has participated in USGS studies of San Francisco Bay since 1972 . Nitrate in the South Platte River Alluvial Aquifer , Colorado 42 Touching the Lives of Every Citizen Every Day ......
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activities Administration aquifer areas assessment atmosphere atrazine Award Bureau California cartographic City City of w coal Colorado Commission contaminants cooperation in earth Coordination data base debris flows Denver Denver Federal Center Division earth sciences earthquake employees energy environment Federal agencies flood floodplain geographic information systems Geological Survey USGS global change ground water ground-water hazards High Plains hydrologic information systems Interior Internet Irrigation KILOMETERS Lake land locations Management District ment Mineral Resources Mississippi River models monitoring Municipal National Center Northridge earthquake Office Park pesticides Planning processes Regional Reston River Basin Scientific and technical sediment seismic Service Soil South Platte River spatial data studies technical cooperation Telephone 703 tion Transportation U.S. Forest Service U.S. Geological Survey United University users USGS USGS scientists Valley volcanoes Water Conservation District Water District water quality Water Resources water-quality