A3: Hydrogeology of the Former Chlor-Alkali Facility Superfund Site and Downstream Bed Sediment Mercury Contamination in the Androscoggin River, Berlin, New Hampshire

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 61-80

The James Webb Space Telescope Mission

Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least $4m$. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the $6.5m$ James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 years, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.Comment: Accepted by PASP for the special issue on The James Webb Space Telescope Overview, 29 pages, 4 figure

Sediment metal concentrations as a function of land use in the Charles River, Eastern Massachusetts

Two sediment cores and eleven grab samples collected from the Charles River were analyzed to determine changes to the concentration of metals in sediments due to anthropogenic changes in the watershed. The unique aspect of this research was that sediment cores from the same geologic setting, yet having widely different sources, were compared. The findings from that comparison were used to focus the investigation through the remainder of the Charles River. The radionuclides 210Pb, 214Pb, and 137Cs established the year of deposition in the sediment cores. The concentrations of aluminum (Al), iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), chromium (Cr), cobalt (Co), lead (Pb), arsenic (As), cadmium (Cd), tin (Sn), scandium (Sc), strontium (Sr), silver (Ag), mercury (Hg) and total organic carbon (TOC) were determined in the sediment cores and surface samples. The primary findings were that several metals in Charles River sediments exceeded regulatory standards for aquatic organisms and that storm water affected the concentrations of metals such as Cu, Hg, and Pb throughout much of the river. What appeared critical was the retention of metals within the upland areas of a watershed which was controlled by the amount of impervious surface. Storm water runoff from areas with greater amounts of impervious materials, coupled with the retention of sediments behind dams in the Charles River, increased the long-term availability of metals that may affect aquatic organisms. A simple model is presented that determines the concentration of Cu and Hg in sediments based on the percentage of impervious area and the concentration of TOC in the sediment. This model indicates that a potential key to reducing the concentrations of metals in sediments is to either reduce the amount of impervious surfaces in a watershed or decrease the supply of metals and TOC to sediments

The James Webb Space Telescope Mission

Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5 m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 yr, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit