Osceola Rural Water System
- 2,400 gpm water treatment plant for iron and manganese removal
- 1 million-gallon glass-fused steel ground storage reservoir
- Maintaining the use of existing facilities during the construction of the new water treatment plant on the same site
- Surface resistivity aquifer testing to efficiently pinpoint high capacity wells
Treatment Plant & Well Exploration
DGR Engineering (DGR) worked closely with OCRWS to design a new Water Treatment Plant (WTP) to target iron and manganese removal from a shallow groundwater source near the site. It was designed on the existing site to minimize the project footprint and avoid additional land purchase. The new treatment process includes aeration, detention, and filtration using a gravity filter arrangement, and will increase OCRWS’s treatment capacity from 750 gpm to 2,400 gpm.
Additional source water capacity was also needed to utilize the treatment capacity of the new WTP. DGR used a surface resistivity testing program to generate multiple snapshots of the aquifer depth and production capacity. The results of the graphs were verified with test drilling, and two new high capacity well sites were identified.
Increasing demands at the new WTP made additional on-site storage necessary. A 1 million-gallon glass-fused steel ground storage reservoir was constructed to accommodate these needs.
The total construction cost of the new WTP project was $7.8 million, which was financed using a combination of Iowa State Revolving Fund (SRF) loan and private funding through CoBank. The SRF funding included a forgivable loan for the generator equipment.
- Electrical Power
DGR Engineering (DGR) worked with the City and the project architect for all aspects of the project including topographic survey, site design, construction survey, construction observation and administration.
Sioux City, Iowa
Sanitary Sewer Rehabilitation
The project was bid and came in under budget. Manhole lids were raised to provide better access in some areas, and rehabilitation of the sewer system was completed to give another 50 years of life to the City’s much-needed infrastructure.
Wastewater Treatment Facility
MBBR technology was chosen based on cost, operational flexibility and most importantly, limited land availability.
DGR employed a Geographic Information System (GIS) in conjunction with the U.S. Army Corps of Engineers to first determine the 100-year flood elevations and delineate the floodway boundaries.
Due to concerns with the age and condition of the structures, along with safety clearances to energized equipment and conductors, a project was undertaken to replace the old infrastructure with new underground lines and associated padmount equipment.
Redwood Falls, MN
Street & Utility Improvements
Morningside Avenue was reconstructed totaling approximately 1,300 linear feet. The project included new sanitary sewer, water main, storm sewer, fiber conduits, decorative street lighting, and 9-inch concrete paving with colored concrete sidewalks.
Sioux City, IA