Hi, Several library inquiries on topic; may be of interest: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *Surface Water Quality:Human Activities Increase Salt Content in Many of the Nation’s Streams* http://www.usgs.gov/newsroom/article.asp?ID=3915&from=rss&utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+usgs%2FnewsEverything+%28Newsroom+-+Everything%29#.U58LZfldVRo *Dissolved-Solids Sources, Loads, Yields, and Concentrations in Streams of the Conterminous United States* http://pubs.usgs.gov/sir/2014/5012/ *SPARROW surface water-quality modelin*g: http://water.usgs.gov/nawqa/sparrow/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *Groundwater Quality:Well-Water for 80,000 New Hampshire Residents May contain Metals Exceeding Human Health Standards* http://www.usgs.gov/newsroom/article.asp?ID=3913&from=rss&utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+usgs%2FnewsEverything+%28Newsroom+-+Everything%29#.U58MCfldVRo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Enjoy the day, Emily ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Emily Wild Librarian (Physical Scientist) U.S. Geological Survey Denver Library Box 25046, MS 914 Denver Federal Center Denver, CO 80225-0046 ph: (303) 236-1003 [log in to unmask] USGS Libraries: http://library.usgs.gov Tutorials: http://tinyurl.com/lh3tmua Professional Page: http://profile.usgs.gov/ecwild ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~