Executive Order Number Fourteen, September 21, 1984

Set the maximum percentage of federal funds allotted to Iowa that may be spent on municipal Wastewater treatment works at 20%.

Reuse of Lime Sludge from Water Softening and Coal Combustion Byproducts, TR-459, 2004

Disposal of lime sludge remains a major challenge to cities in the Midwest. Disposal of lime sludge from water softening adds about 7-10% to the cost of water treatment. Having effective and safe options is essential for future compliance with the regulations of the State of Iowa and within budget restrictions. Dewatering and drying are essential to all reuse applications as this affects transportation costs and utility. Feasibility tests were conducted on some promising applications like SOx control in power generation facilities that burn coal, replacement of limestone as an ingredient in portland cement production, dust control on gravel roads, neutralization of industrial wastewater pH, and combination with fly ash or cement in construction fill applications. A detailed report and analysis of the construction fills application is presented in the second half of the report. A brief discussion of the results directly follows.

Applications for Reuse of Lime Sludge from Water Softening, TR-535, 2005

Lime sludge, an inert material mostly composed of calcium carbonate, is the result of softening hard water for distribution as drinking water. A large city such as Des Moines, Iowa, produces about 30,700 tons of lime sludge (dry weight basis) annually (Jones et al., 2005). Eight Iowa cities representing, according to the United States (U.S.) Census Bureau, 23% of the state’s population of 3 million, were surveyed. They estimated that they collectively produce 64,470 tons of lime sludge (dry weight basis) per year, and they currently have 371,800 tons (dry weight basis) stockpiled. Recently, the Iowa Department of Natural Resources directed those cities using lime softening in drinking water treatment to stop digging new lagoons to dispose of lime sludge. Five Iowa cities with stockpiles of lime sludge funded this research. The research goal was to find useful and economical alternatives for the use of lime sludge. Feasibility studies tested the efficacy of using lime sludge in cement production, power plant SOx treatment, dust control on gravel roads, wastewater neutralization, and in-fill materials for road construction. Applications using lime sludge in cement production, power plant SOx treatment, and wastewater neutralization, and as a fill material for road construction showed positive results, but the dust control application did not. Since the fill material application showed the most promise in accomplishing the project’s goal within the time limits of this research project, it was chosen for further investigation. Lime sludge is classified as inorganic silt with low plasticity. Since it only has an unconfined compressive strength of approximately 110 kPa, mixtures with fly ash and cement were developed to obtain higher strengths. When fly ash was added at a rate of 50% of the dry weight of the lime sludge, the unconfined strength increased to 1600 kPa. Further, friction angles and California Bearing Ratios were higher than those published for soils of the same classification. However, the mixtures do not perform well in durability tests. The mixtures tested did not survive 12 cycles of freezing and thawing and wetting and drying without excessive mass and volume loss. Thus, these mixtures must be placed at depths below the freezing line in the soil profile. The results demonstrated that chemically stabilized lime sludge is able to contribute bulk volume to embankments in road construction projects.

1210-007IJ Central Park Lake Final Report

The Central Park Lake Watershed Assessment and Management Plan identified four categories where improvements are needed to remove the 23 acre lake from the impaired waters list. These include the wastewater system, runoff from surrounding lands, in-lake nutrient re-suspension and runoff from hard surfaces within the park. The lake is currently impaired for bacteria, algae and pH. Through outcomes of the Watershed Assessment and Management Plan, this proposal includes for abandonment and reclamation of the single cell wastewater lagoon site, replacement with three conventional septic systems and construction of two wetlands. One of the wetlands is located on the same site as the reclaimed lagoon and the other is located to intercept sediment and trap nutrients transported by tile lines. The prescribed wastewater system improvements are based on assessment by grab samples test by the State Hygienic Lab, development of a Preliminary Engineering Report, soil analysis and communication with IDNR wastewater officials. The two wetland sites were assessed by officials from IDALS and the Jones County SWCD. This project is part of $1.7 million lake restoration effort to reclaim the 47 year old lake. The lake has a positive economic impact of more than $7.6 million annually and supports an average annual visitation of 58,145, according to the Iowa Lakes Valuation Project, conducted by Iowa State University.

07014-005 Maple River Watershed Final Report

The proposed project will include the construction of a sanitary sewer collection system and a community gravel filter wastewater treatment system in the unsewered community of Maple River Junction in Carroll County. The system will be built to include approximately 1,150 feet of 4-inch sanitary sewer main, 3,540 feet of 4-inch service main an approximately 35 septic tanks. Some existing 4-inch PVC sewer piping as well as existing septic tanks in good condition will continue to be used in order to control capital costs.

06027-013 Leisure Lake Watershed Final Report

Leisure Lake is approximately a 67 acre water body located in northwest Jackson County with a 2,681 acre drainage area. The watershed including the lake is a tributary to Lytle Creek which drains into the North Fork of the Maquoketa River. Portions of the Lytle Creek and North Fork Maquoketa River are on the 303(d) impaired waterbodies list. The project area includes a community of 370 residential properties and one business that currently has no central wastewater collection and treatment system. The purpose of this project is to construct a wastewater collection and treatment facility to improve water quality in the creek and river. The project will eliminate the non-permitted septic systems and construct a new wastewater system to properly treat wastewater prior to its discharge into the waterways.

06031-014 City of Carpenter Sewage Treatment System Project Final Report

The Mitchell County Soil and Water Conservation District is applying on behalf of the incorporated community of Carpenter to construct a wastewater collection and treatment system to assist in the environmental cleanup and protection of Deer Creek. IDNR water monitoring of the community tile line has shown consistently elevated levels of fecal coliform bacteria indicating the presence of untreated sewage water. These are obvious health threats to the downstream users and wildlife in Deer Creek and the Cedar River. A new sewer system for the community of Carpenter will eliminate illegal discharges into the creed and be the first step in the overall protection of the stream.

05021-008 Clear Creek Watershed Final Report Report

The Iowa County Soil and Water Conservation District is applying on behalf of the unincorporated community of Conroy to construct a wastewater collection and treatment system to assist in the cleanup and protection of the Clear Creek Watershed. Conroy sits at the headwaters of Clear Creek. Monitoring of the watershed has shown consistently high levels of E.coli bacteria and chloride near the upper end of the creek. In addition, toilet paper and fecal material have been observed on numerous occasions. These are obvious health threats to the residents of the watershed. The monitoring of the watershed, coupled with lab analysis, suggest septic inputs are negatively impacting the headwaters of Clear Creek. A new sewer system for the community of Conroy will eliminate illegal discharges into the creek and be the first step in the overall protection of the watershed and the water quality therein.

City Energy Management Program: A Regional Energy Manager Approach, May 2014

Through the City Energy Management Program, energy managers will directly work with up to 20 municipalities in Iowa to help identify opportunities to reduce energy costs in city-owned buildings, exterior lighting, and water/wastewater facilities. This assistance will be provided to the selected municipalities who will provide an in-kind match to achieve energy efficiency within their community.

City Energy Management Program A Regional Energy Manager Approach, May 2014

Through the City Energy Management Program, energy managers will directly work with up to 20 municipalities in Iowa to help identify opportunities to reduce energy costs in city-owned buildings, exterior lighting, and water/wastewater facilities. This assistance will be provided to the selected municipalities who will provide an in-kind match to achieve energy efficiency within their community. Power Point of theses resources.

09014-010 Lytle Creek Watershed Final Report

Brief Project Summary (no greater than this space allows): Leisure Lake is a 20 acre water body located in northwest Jackson County with a 2,581 acre drainage area. This portion of the Maquoketa Watershed including the lake is a tributary to Lytle Creek which drains into the North Fork Maquoketa River and into the Maquoketa Watershed. Portions of the Lytle Creek and North Fork Maquoketa River are on the 303(d) impaired waterbodies list. The project area includes a community of 370 residential properties and one business that currently has no central waste water collection and treatment system. The County Sanitarian estimates at least 225 of these properties do not have properly operating septic systems and ultimately drain their wastewater into the lake. The purpose of this project is to construct a wastewater collection and treatment facility to improve water quality in the creek and river. The project will eliminate the non-permitted septic systems and construct a new wastewater system to properly treat wastewater prior to its discharge into the waterways.