News

Infrastructure Security Article December 28, 2000
There is a variety of standard technologies available to treat and dispose domestic wastewater. These include connections to a local publicly-owned treatment works (POTW), private treatment plants, and septic tank and leach field systems. Evapotranspiration (ET) systems can provide an additional...
Tanks Article December 28, 2000
Elevated and ground-level water storage tanks are an integral part of most water distribution systems. Not only do these vessels ensure adequate hydrostatic pressure and an abundant supply of clean drinking water, but they have also become landmarks for many communities. However, if not properly...
Infrastructure Security Article December 28, 2000
Britain's driest summer in 20 years has highlighted the relevance of developing new methods for water network monitoring and leakage detection. The difference between the volume of water that leaves the water treatment works and the estimated amount that is used by consumers is termed "water...
Bridges Article December 28, 2000
Environmental concerns indirectly turned into a big plus for Erie County, N.Y., last year. To replace a deteriorated bridge on Savage Road, the county's consultant planned a stream relocation and designed a steel girder bridge with a span substantially longer than the existing 1930s steel and...
Bridges Article December 28, 2000
When opened to traffic on Dec. 2, 1961, the Duluth-Superior High Bridge was recognized as an overdue transportation modernization. The Twin Ports of Duluth, Minn., and Superior, Wis., are situated on opposite shores of the St. Louis River at the western end of Lake Superior, and travel between them...
Storm Water Article December 28, 2000
Any facility that treats, stores or disposes of wastes faces environmental exposures. While these seem apparent at landfills or hazardous waste treatment facilities, environmental exposures are less obvious at facilities such as wastewater treatment plants. Nevertheless, wastewater treatment plants...
Infrastructure Security Article December 28, 2000
Changing membranes in pressure vessels is easy with the proper tools. Here is how we do it. To open a PVC pressure vessel, first remove any pins holding one end plug in place. (Note: many fiberglass pressure vessels use a snap ring to hold the plug in place. Properly -sized snap ring pliers...
Bridges Article December 28, 2000
The New Brickell Bridge is a reflection of Miami, a city long in history that has transformed itself into a cultural center and the modern financial capital of Latin America. Like the city, the designers of the bascule bridge, which opened late last year, remained true to artistic and aesthetic...
Filtration Systems Article December 28, 2000
Many industries utilize media-bed filtration. This use may take the form of ion exchange for water softening/demineralization, sand filtration, activated carbon, and other fluid treatment processes. However, whether the application is in a water utility, a power utility, pulp and paper, steel, or...
Asphalt Article December 28, 2000
Across the state, a Michigan contractor is rebuilding county roads for a fraction of the cost of reconstruction. Pavement Recycling Inc. of Rochester, Mich., uses three processes to reclaim county road bases in-place. All methods feature pulverization of old asphalt using two reclaimer-stabilizers...
Article December 28, 2000
Election Day-Tuesday, November 5-is less than a month away. Whether you plan on voting for President Bill Clinton or former Sen. Robert Dole, the important thing is to remember to vote. In an effort to arm our readers with information before they go off to the voting booth, ROADS & BRIDGES has...
Storm Water Article December 28, 2000
Today's Best Professional Judgments (BPJs) are scrutinized closer than professional football players were when the National Football League allowed the referees to use instant replay to make judgment calls. However, by experience in the environmental field and by reading and applying a minimum base...
Trucks Article December 28, 2000
Meekly following behind powerful trucks, carrying glamorous pieces of construction equipment on its backs, trailers, and its contribution to construction, are often disregarded and over looked. Modest in design these 'Plain Janes' do not sport the high profile features common among other equipment...
Article December 28, 2000
Recently, on a long flight home from a business trip, I found myself thinking about a case a contractor lost because of a "no damage for delay" clause in a contract. This prompted a daydream about a project where the owner unfairly shifted risk to the contractor and all of the bidders put...
Asphalt Article December 28, 2000
Editor's note: This is the second installment of a two-part series on asphalt compaction. In the August issue, Scherocman, a consulting engineer in pavement design and construction located in Cincinnati, discussed the importance of compaction and the relationship between density and the air-void...
Asphalt Article December 28, 2000
Chip seal disadvantages for HMA overlays Some highway agencies apply a chip seal (or seal coat) before placing a dense-graded hot-mix asphalt (HMA) overlay. Quite often the HMA placement follows immediately behind the chip seal operation. The seal usually consists of spraying an emulsified asphalt...
Highways Commuting Article December 28, 2000
A new report on national commuting patterns, which received a lot of air play on radio stations across the country in August, verifies what many in the highway industry have known for some time: job creation in the suburbs and a need for more flexible mobility are drawing American commuters away...
Infrastructure Security Article December 28, 2000
When should you replace a water meter? This question has become an evasive one for many Utilities that have to make this decision. On the basis of these meter readings, Utilities assess their water and wastewater customers with the corresponding consumption fees. Therefore, these fees, dictated by...
Bids Article December 28, 2000
In highway-construction bidding, rarely does a disappointed bidder overturn a decision by state or local government officials because to do so generally requires a finding that the officials exercised their discretion arbitrarily. While, in general, state agencies are required to award public works...
Asphalt Article December 28, 2000
Open-graded friction course (OGFC) mixes have been around longer than many contractors or department of transportation officials may recall. As early as the 1930, Oregon was using a type of OGFC; by the 1940s, many other Western states had employed similar types of friction coats. In the 1970s,...
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