2011 Annual Compliance Report of the Iowa Public Drinking Water Program, Department of Natural Resources, June 2012

This report contains information about Iowa's public drinking water program for the calendar year 2011. Included in the report are descriptions of Iowa's systems, monitoring and reporting requirements of the systems, and violations incurred during the year. This report meets the federal Safe Drinking Water Act's requirement of an annual report on violations of national primary drinking water regulations by public water supply systems in Iowa.

Evaluation of Fly Ash in Water Reduced Paving Mixtures, June 1985

Fly ash was used to replace 15% of the cement in C3WR and C6WR concrete paving mixes containing ASTM C494 Type A water reducin9 admixtures. Two Class C ashes and one Class F ash from Iowa approved sources were examined in each mix. When Class C ashes were used they were substituted on the basis of 1 pound of ash added for each pound of cement deleted. When Class F was used it was substituted on the basis of 1.25 pounds of ash added for each pound of cement deleted. Compressive strengths of the water reduced mixes, with and without fly ash, were determined at 7, 28, and 56 days of age. In every case except one the mixes containing the fly ash exhibited higher strengths than the same concrete mix without the fly ash. An excellent correlation existed between the C3WR and C6WR mixes both with and without fly ash substitutions. The freeze-thaw durability of the concrete studied was not affected by presence or absence of fly ash. The data gathered suggests that the present Class C water reduced concrete paving mixes can be modified to allow the substitution of 15% of the cement with an approved fly ash.

Low Water Stream Crossing: Design and Construction Recommendations, Decemeber 2001

Most counties have bridges that are no longer adequate, and are faced with large capital expenditure for replacement structures of the same size. In this regard, low water stream crossings (LWSCs) can provide an acceptable, low cost alternative to bridges and culverts on low volume and reduced maintenance level roads. In addition to providing a low cost option for stream crossings, LWSCs have been designed to have the additional benefit of streambed stabilization. Considerable information on the current status of LWSCs in Iowa, along with insight of needs for design assistance, was gained from a survey of county engineers that was conducted as part of this research (Appendix A). Copies of responses and analysis are included in Appendix B. This document provides guidelines for the design of LWSCs. There are three common types of LWSCs: unvented ford, vented ford with pipes, and low water bridges. Selection among these depends on stream geometry, discharge, importance of road, and budget availability. To minimize exposure to tort liability, local agencies using low water stream crossings should consider adopting reasonable selection and design criteria and certainly provide adequate warning of these structures to road users. The design recommendations included in this report for LWSCs provide guidelines and suggestions for local agency reference. Several design examples of design calculations are included in Appendix E.

Low Water Stream Crossing: Design and Construction Recommendations; A Selection and Design Guide, February 2003

Most Iowa counties maintain low volume roads with at least one bridge or culvert that is structurally deficient or obsolete. In some counties the percentage of deficient drainage structures may be as high as 62%. Replacement with structures of similar size would require large capital expenditures that many counties cannot afford. Low water stream crossings (LWSCs) may be an acceptable lowcost alternative in some cases.

Audit report on the Xenia Rural Water District for the year ended December 31, 2011

Audit report on the Xenia Rural Water District for the year ended December 31, 2011

Audit report on the Hiawatha Water Department, Hiawatha, Iowa for the year ended June 30, 2012

Audit report on the Hiawatha Water Department, Hiawatha, Iowa for the year ended June 30, 2012

Audit report on the Iowa Water Pollution Control Works Financing Program and the Iowa Drinking Water Facilities Financing Program, joint programs of the Iowa Finance Authority and the Iowa Department of Natural Resources for the year ended June 30, 2012

Audit report on the Iowa Water Pollution Control Works Financing Program and the Iowa Drinking Water Facilities Financing Program, joint programs of the Iowa Finance Authority and the Iowa Department of Natural Resources for the year ended June 30, 2012

Audit report on the Iowa Petroleum Underground Storage Tank Board for the year ended June 30, 2011

Audit report on the Iowa Petroleum Underground Storage Tank Board for the year ended June 30, 2011

Audit report on the Dallas Center Water Department, Dallas Center, Iowa for the year ended June 30, 2012

Audit report on the Dallas Center Water Department, Dallas Center, Iowa for the year ended June 30, 2012

Report on a special investigation of the Creston Water Works for the period July 1, 2005 through November 16, 2012

Report on a special investigation of the Creston Water Works for the period July 1, 2005 through November 16, 2012

Audit report on the Xenia Rural Water District for the year ended December 31, 2012

Audit report on the Xenia Rural Water District for the year ended December 31, 2012

2012 Annual Compliance Report of the Iowa Public Drinking Water Program, June 2013.

This report contains information about Iowa's public drinking water program for the calendar year 2012. Included in the report are descriptions of Iowa's systems, monitoring and reporting requirements of the systems, and violations incurred during the year. This report meets the federal Safe Drinking Water Act's requirement of an annual report on violations of national primary drinking water regulations by public water supply systems in Iowa.

Audit report on the Iowa Petroleum Underground Storage Tank Board for the year ended June 30, 2012

Audit report on the Iowa Petroleum Underground Storage Tank Board for the year ended June 30, 2012

Audit report on the Hiawatha Water Department, Hiawatha, Iowa for the year ended June 30, 2013

Audit report on the Hiawatha Water Department, Hiawatha, Iowa for the year ended June 30, 2013

High Range Water Reducer in Portland Cement Concrete Made with D-Cracking Susceptible Coarse Aggregate, HR-1021, 1980

The objective of this research was to determine of the use of High Range Water Reducers (HRWR) (resulting in a lower water content ratio) with a D-cracking susceptible crushed limestone coarse aggregate would yield significant improvement in the durability.