Summary of 10 States Standards for Drinking Water Distribution Piping Design

by Erin Heydinger
April 6, 2017

The Great Lakes-Upper Mississippi River Board develops recommended standards for water works. These standards are followed by regulatory agencies in Minnesota and are used for the design of water systems.

Below is a summary of system design standards for distribution system piping and appurtenances:

Pressure:

  • The system should maintain a pressure of 20 psi at all points under all flow conditions.
  • Normal working pressure should be 60 to 80 psi, and no less than 35 psi.

Diameter:

  • Water mains that provide fire protection should be at least eight inches (8″) in diameter.
  • Water mains that do not provide fire protection should be at least three inches (3″) in diameter.

Fire protection:

  • Systems should be designed in accordance with State Insurance Office fire requirements.

Dead ends:

  • Dead ends should be minimized to reduce stagnant water, provide reliable service, and reduce head loss.
  • Dead ends should be equipped with a way to provide flushing at a rate of at least 2.5 feet per second in the pipe being flushed.

For the full set of the standards, click here.

The Alphabet Soup of Minnesota Environmental Review: EAWs, AUARs and EISs

by Andi Moffatt
Feb. 6, 2015

Acronyms

  • AUAR: Alternative Urban Areawide Review
  • EAW: Environmental Assessment Worksheet
  • EIS: Environmental Impact Statement
  • EQB: Environmental Quality Board
  • MEPA: Minnesota Environmental Policy Act
  • NEPA: National Environmental Policy Act
  • RGU: Responsible Government Unit

Introduction

The Minnesota Environmental Policy Act (MEPA) and Minnesota Rules 4410 require some projects to undergo environmental review prior to obtaining permits or approvals. The purpose of this review process is to avoid and minimize damage to environmental resources (Minnesota Rules 4410.0300). The Environmental Quality Board (EQB) promulgates rules and provides guidance to the state’s environmental review program. This article provides information about the Minnesota environmental review process, discusses some triggers for environmental review, and discusses general timelines for the process.

Background

The MEPA was enacted in 1973. It was modeled after the federal National Environmental Policy Act (NEPA), but written to specifically address other projects the state, public, and agencies deemed to need environmental review.

Three documents are the basis for Minnesota’s environmental review program:

  • Environmental Assessment Worksheet (EAW)
  • Environmental Impact Statement (EIS)
  • Alternative Urban Areawide Review (AUAR)

All three documents generally analyze similar topics for a given project, including stormwater management; wetland, habitat and fisheries; water and wastewater; traffic; air; noise; cultural resources; pollutant sources; and impact to infrastructure and the environment. The main difference between the documents is the extent and level of analysis needed.

The EAW is the heart of the state’s environmental review program. The purpose of the EAW is to determine if an EIS is needed. The EAW is intended to be a basic document, while an EIS goes into much more detailed analysis and investigation and is required if a project meets a mandatory EIS threshold or if the EAW cannot adequately gauge the possible environmental impacts of a project.

An AUAR can be thought of as a hybrid between an EAW and an EIS. While an EAW and EIS are used for specific projects (e.g., a big-box retailer proposing to develop within a city), an AUAR is used to analyze different development scenarios where a specific development is not known. Cities can use AUARs to analyze general development of a section of their city, understand possible impacts of the development, and identify specific mitigation measures. An AUAR can also be used for certain specific development plans that may trigger an EIS as an alternative to the EAW; however, there are additional review steps in these unique cases. Additionally, some types of development, such as heavy industrial development, cannot use the AUAR process.

The table below generally summarizes when to use each document.

      EAW        EIS        AUAR
  • Project with a specific development plan
  • Required by Minnesota Rules 4410
  • If petition for review is granted
  • RGU discretion
  • Project with a specific development plan
  • Required by Minnesota Rules 4410
  • EAW determines it is necessary
  • Projects with significant impact
  • Projects with undefined development plan
  • Large tract of land anticipated to develop
  • Can be used in some cases if EAW or EIS is required (check rules beforehand)

 

Environmental review triggers

There are many different triggers for a mandatory EAW or EIS, which depend on factors such as the location of a project, the type of project, and the city where the project is located. Common EAWs or AUARs include reviews for new residential development, construction of light industrial or commercial areas, new sanitary sewers of a specific capacity, some road projects, and projects that have large impacts to wetlands or water bodies. A full listing of the environmental review triggers can be found here.

The public can also petition to have an EAW completed for a project. In this process, a petition must be submitted to the EQB with at least 100 signatures. The EQB reviews the petition for completeness and submits it to the RGU for technical review and a final determination.

Timeline

Timelines will always depend on the specifics of an individual project or review. A general rule of thumb, however, for the time it takes to develop these documents is as follows:

  • EAW: 3-5 months
  • EIS: 1-3 years
  • AUAR: 1 year

Who completes the document?

The rules specify the RGU for each type of project. It is often the land use authority (a city or county) but could also be the Minnesota Pollution Control Agency or another agency. The project proposer is required to supply certain information to the RGU to complete the document. The RGU is responsible for making sure it is accurate and complete. We have seen this process work in one of two ways: sometimes, the RGU prepares the document with information provided from the project proposer; in other instances, the project proposer prepares the document and then the RGU reviews and finalizes it. Both ways are acceptable.

Review process

Once a document is complete, it is submitted for a 30-day public comment period and is sent to the required review agencies. After the comment period, responses will be prepared.

For an EAW, a Findings and Conclusions document is prepared for the RGU decision-making authority, such as a City Council, which is tasked with reviewing the document and preparing a Record of Decision on the Need for an EIS.

For an EIS or AUAR, a final document is prepared that includes revisions based on the comments received prior to going to the RGU decision-making authority.

What does this mean for you?

Check the required triggers for an environmental review early in the project proposal process. A project’s timeline may be impacted by required reviews. Additionally, there is a prohibition on governmental approvals and construction until the environmental review process is completed.

Complete information can be found at the Minnesota Environmental Quality Board website.

Envision: The Age of Sustainable Infrastructure is Here

By Brandon Movall
Aug 1, 2016

With the state of America’s infrastructure declining due to climate change and limited funding, today’s engineers and scientists must adopt creative and sustainable solutions. In 2011, the American Society of Civil Engineers (ASCE), the American Council of Engineering Companies (ACEC), and the American Public Works Association (APWA) came together to revolutionize the way engineers plan, design and build. The result was Envision, a holistic rating system for sustainable infrastructure.

Envision is a rating system to help project teams incorporate higher levels of sustainability at each step of a project, from assessing costs and benefits over the project lifecycle to evaluating environmental benefits and using outcome-based objectives. Envision considers social, environmental, and economic factors of projects (a process called the Triple Bottom Line), rather than only focusing on economic factors. Envision uses a scorecard of 60 credits divided into five categories that reflect all aspects of the Triple Bottom Line:

  • Quality of Life
  • Leadership
  • Resource Allocation
  • Natural World
  • Climate and Risk

By tallying the credits achieved throughout the project lifecycle, Envision is able to effectively rate proposed infrastructure options in a way that is easy to communicate to clients, consultants and owners.

While there are many sustainability rating systems out there, there are a few things that make Envision the best option:

  1. Envision rates all types of civil infrastructure, such as transportation, water, energy, information, and landscape infrastructure.
  2. Envision covers the entire life cycle of a project, from the first meeting of the project team to post-construction maintenance.
  3. Envision is free to use. Anyone can sign up for an Envision account and have access to the guidance manual and scorecard. The only costs involved are if a project is registering for awards through Envision, or if you want to get special training and become an Envision Sustainability Professional (ENV SP). These are optional and are not necessary to use the Envision system on a project.

In addition to individual users, many companies and public agencies across the United States have implemented Envision into their planning, design and construction processes. Benefits to a company or agency include discounted ENV SP certification rates, discounted project award registration rates, exclusive content from the founding organizations, and more. As part of our commitment to bettering ourselves, our clients, and our world, WSB is proud to be recently certified as an Envision qualified company.

To change the world, we must change our practices. Envision is one large step toward planning, designing and building a sustainable future. For more information about Envision in general, visit www.sustainableinfrastructure.org. For more information about Envision at WSB, please contact Katy Thompson, Brandon Movall, Stephanie Hatten, or Ann Wallenmeyer.

References:

“2013 Report Card for America’s Infrastructure.” 2013 Report Card for Americas Infrastructure. ASCE, n.d. Web. 28 July 2016.

“Envision.” Institute For Sustainable Infrastructure. N.p., n.d. Web. 28 July 2016.