Guide Temp: Life in the Stagnant Lane

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Measure pH or ORP, and temperature.

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Application oriented benchtop sets for multiple parameter monitoring: pH, mV, ISE, saturation, concentration, partial pressure, conductivity, special resistance, salinity, TDS, temperature. Cutting edge technology from WTW for demanding laboratory applications. A large glass shield protects the graphic display and supports the presentation of the measuring values and recognition of important information. It was serendipitous that one of the four companies in the consortium was American Bridge Co. Even those tasks were not straightforward because the bridge was opened when asbestos, lead paint and PCBs were not considered the dangers they are today.

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Removing the concrete decks underlying the asphalt came next, many of which were installed in recent years as repairs had to be made to a bridge that had exceeded its useful year life. Cranes then drop the steel trusses onto barges floating below. Perhaps the trickiest work was removing a foot-long steel truss that extended over the tracks of a line on the Metro North railroad. For that, train service was suspended for several hours. The massive crane lifted the heavy piece and dropped it on a barge and train service resumed.

The pillars that tether much of the long causeway on the Rockland County side of the bridge have to be cut at the base and knocked over using a variety of underwater machinery, including excavators, hydraulic shears and hydraulic jackhammers.

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Soon, workers will tackle the main span, which is over 1, feet long and looks like a double sine wave assembled with an old Erector set. It is a cantilever-type construction, which in this case means that anchored arms, each about feet long, extend over the water and together hold up a foot-long central piece, bolstered by two foot-long steel side supports.

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The steel trusses will end up in a recycling center in Albany. The concrete rubble and timber are also being shipped to Port of Coeymans, 10 miles south of Albany. Some truss pieces are destined for scrap yards in Clermont, N. By , the longest segment of the glacier was less than 4. Paradise-Stevens Glacier Nearly a century ago, one of the main attractions in the park was the Paradise-Stevens Glacier area. At that time, Paradise-Stevens Glacier was riddled with ice caves and crevasses and was within easy walking distance of major roads.

An map of the glacier places its terminus within 0. The rapid melting of the ice left behind a large area strewn with boulders and rubble carried by the glacier and its meltwater streams, providing visitors with an uncommon opportunity to observe the rock features at the bed of a glacier. Nisqually Glacier Nisqually Glacier is perhaps the most visited and best surveyed glacier on Mount Rainier. Due to easy access and its prominent location near Paradise, the glacier has been studied since the mids. In , Lt. August Kautz crossed Nisqually Glacier during an attempt to climb the summit.

In , Allen Mason photographed the glacier for the first time, laying the foundation for a photographic record of the Nisqually Glacier that spans over a century. Geologic Survey USGS began a series of measurements of glacial surface elevation to determine the impact of the Nisqually Glacier's retreat on water supplies for hydroelectric power production.

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USGS and park scientists continue to regularly survey the glacier today. The product of this research is a record of Nisqually Glacier change spanning nearly years. During this time the glacier has retreated and advanced several times, though the general trend has been retreat. In , Kautz wrote in his journal that the terminus reached a narrow rock channel located underneath the present Glacier bridge on the road to Paradise. By the time Mason began photographing the glacier, the terminus had retreated up the valley 0.

Photographs taken early in the s show national park visitors posing near the bridge with the glacier clearly visible over their shoulders. By the s, such photographs were not possible since the glacier had retreated nearly 1. An advance in the glacier a few years later made it once again visible from the bridge for a short time. However, by the s the glacier had resumed its retreat and again disappeared from view.

Since that time the glacier has gone through a series of minor advances and retreats.

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Viewing Nisqually Glacier : The best views of the glacier are from the Nisqually Vista Trail in Paradise, which starts from the lower parking lot. Kautz Glacier Kautz Glacier is located immediately west of Nisqually Glacier on the mountain's southwestern flank. Beginning at nearly 13, feet 4, m , the glacier extends less than 2. Although the Kautz Glacier is one of the smallest on the mountain, it is a significant player in the recent geologic history of the park.

Twice during the last century the Kautz Glacier was the cause of major debris flows. In October , water abruptly drained from underneath the glacier, ripping away a section of glacier over 1 mile 1. Downstream the water mixed with rock, trees, and other debris to form a fast moving slurry that flowed across the park road almost 6.

In August , water bursting from Kautz glacier produced a debris flow that flowed over a ridge and into Van Trump Creek. To reach the point, take the Comet Falls trail, which starts from the small parking lot along the Nisqually-Paradise Road just west of Christine Falls. Follow the trail past Comet Falls to reach the junction with the trail to Mildred Point.

South Tahoma and Tahoma Glaciers South Tahoma and Tahoma Glaciers are separate glaciers that were connected in the recent historical past. Near its terminus the glacier becomes a stagnating mass of ice covered by rock that is nearly indistinguishable from the surrounding moraine. Tahoma Glacier flows from the summit as a single stream of ice before splitting into two lobes that empty into Tahoma Creek and Puyallup River valleys.

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Between 25, and 15, years ago the Tahoma and South Tahoma Glaciers were connected, forming a tributary to the ancient Nisqually Glacier. The two smaller glaciers were again connected during the Little Ice Age about years ago and remained so until nearly the middle of the s. Like other glaciers on Mount Rainier, South Tahoma produces periodic and sudden catastrophic floods.