What You Need to Know for Construction Projects

Construction projects generally require ground disturbing activities and the use of various types of materials (e.g., paint, fertilizer, etc.), all of which culminates in these projects posing a higher risk to stormwater quality.

Ground that has been disturbed by construction and left unstabilized can be easily eroded by rain or runoff. As a result, stormwater runoff from construction sites can cause significant harm to our streams and coastal waters.

To mitigate the potential pollution associated with construction projects stormwater best management practices (BMPs) are employed. These practices help to reduce the risk of storm water pollution and help keep our oceans clean. Below you will find BMP related resources for contractors and project designers.


Step 1: Check If Permits Are Needed for Your Project

BEFORE STARTING WORK on any construction project (for HWY-M or within HWY-M
rights-of-way), ask yourself these questions below. If you answer “YES” to any of the
following
questions, you will need a permit in order to start work:

Criteria Permits Needed Additional Forms BMP Plan

1. Am I working within HWY-M right-of-way?

Required

2. Will my project discharge into an HWY-M storm
drain
? (even if the project does not have construction activities
within HWY-M Right-of-Way)

Required

3. Will my project connect to an HWY-M storm
drain
?

Required

4. Does my project disturb an acre or more of
land
?

  • National Pollutant Discharge Elimination System General Permit Coverage or
    Individual Permit Coverage

(Get it on the State of Hawaii Department of Health, Clean Water Branch site)

NOT REQUIRED

Step 2: Check If You Need to Draft a Site-Specific Construction BMP Plan

If numbers 1, 2, or 3 above apply to your project,

YES.

If number 4 applies, note:

For HWY-M construction contracts that disturb an acre or more of total area and require an
NPDES permit, the Storm Water Pollution Prevention Plan (SWPPP) template must be used in
lieu of a Site-Specific Construction BMP Plan. A copy of the SWPPP template may be obtained
through the HDOT Highways Maui District office.

Helpful Resources for Formulating a BMP Plan

For Projects involving work within or encroaching upon HDOT Harbors property

Step 1: Permits

Step 1: Check If Permits Are Needed for Your Project

BEFORE STARTING WORK on any construction project (for HWY-M or within HWY-M
rights-of-way), ask yourself these questions below. If you answer “YES” to any of the
following
questions, you will need a permit in order to start work:

Criteria Permits Needed Additional Forms BMP Plan

1. Am I working within HWY-M right-of-way?

Required

2. Will my project discharge into an HWY-M storm
drain
? (even if the project does not have construction activities
within HWY-M Right-of-Way)

Required

3. Will my project connect to an HWY-M storm
drain
?

Required

4. Does my project disturb an acre or more of
land
?

  • National Pollutant Discharge Elimination System General Permit Coverage or
    Individual Permit Coverage

(Get it on the State of Hawaii Department of Health, Clean Water Branch site)

NOT REQUIRED
Step 2: BMP Plan

Step 2: Check If You Need to Draft a Site-Specific Construction BMP Plan

If numbers 1, 2, or 3 above apply to your project,

YES.

If number 4 applies, note:

For HWY-M construction contracts that disturb an acre or more of total area and require an
NPDES permit, the Storm Water Pollution Prevention Plan (SWPPP) template must be used in
lieu of a Site-Specific Construction BMP Plan. A copy of the SWPPP template may be obtained
through the HDOT Highways Maui District office.

Helpful Resources for Formulating a BMP Plan

Other: Harbor

For Projects involving work within or encroaching upon HDOT Harbors property

Post-Construction BMP Requirements

The State of Hawaii, Department of Transportation, Highways Division has developed a manual in 2015 that addresses post-construction BMP requirements to provide procedures and guidelines to ensure that post-construction BMPs are considered and implemented, as applicable, throughout all phases of new development, redevelopment, and private construction projects. This manual was revised in 2022 to prioritize LID BMPs, include separate post-construction BMP criteria for MS4 and non-MS4 areas, revise evaluation process for a variance from LID BMP requirements, and include an alternative compliance process for projects that cannot address the full required treatment area using post-construction BMPs.