Maintaining Water Quality in Voyageurs National Park
Voyageurs National Park is a recreational area with a high degree of water-based and water-oriented recreation and requires water quality surveillance. Bench mark (baseline) water quality...

Role of Nitrogen in Activated Sludge Process
Study of the effect of nitrogen limitation on metabolic activities of activated sludge has been conducted by using a completely mixed continuous flow bench-scale activated sludge unit....

Landfill Disposal of Liquid Sewage Sludge
This report presents results of a 3 yr demonstration study of disposing liquid sewage sludge and septic tank pumpings into a solid waste sanitary landfill. The study was performed in four...

Use of Trees as Bench Marks in Expansive Clays
The use of fire hydrants, utility poles, and trees as temporary or permanent bench marks for construction control is well established in surveying practice. Recent observations of trees...

Biodegradation of Malathion
Laboratory studies using bench-scale activated sludge units and a Warburg respirometer show that an aerated aqueous microbial system can rapidly remove the organo-phosphate insecticide,...

Land Subsidence Problems
A review of the land subsidence problem in the Texas Gulf Coast area is presented, together with a discussion of the causes of the subsidence and how the amount may be estimated by soil...

Highway and Bridge Surveys: Vertical Control and Special Control Problems in Bridge Construction: Progress Report, Committee on Engineering Surveying
Progress report of Committee on Eng Surveying on precise execution of controls; checking of elevation of existing bench marks; special control problems in construction; controls for suspension...

Experiments on the Stability of Bench Marks
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