• Public Infrastructure Review Process
• Permit Applications

Why is a Grading & Erosion Control Permit necessary?

The purpose of the permit is two-fold. The grading portion of the permit ensures that clearing, grading and fill work is performed in a manner that does not adversely affect adjacent properties and that criteria set forth in approved plans is met. The Erosion Control aspect is more far-reaching. Local, State and Federal rules have been established to protect and enhance the quality of the Tualatin River and its tributaries. Even though a construction project may be small, the cumulative impact of sediment loss from all project sites necessitates maximum effort to prevent sediment from entering the waterways directly or through the storm collection system.

A Grading and Erosion Control Permit is required when one or more of these conditions apply to your site:

1. There is a soil disturbance of over 500 square feet or more.
2. The amount of excavation, fill or combination thereof exceeds 20 cubic yards.
3. The slope of a site is greater than 20%.
4. A land use approval requires a Grading and Erosion Control Permit.

To apply for a Permit, submit the following items to Alfreda Cnossen:

1. An Erosion Control Application Form completed and signed.
2. A Service Provider Letter, from Clean Water Services (CWS).
3. Conditions of Approval, established through the City of Hillsboro Planning Department.
4. Construction Plans.

A.  If less than one (1) acre of the site will be disturbed during the construction process, submit three (3) copies of plans with the information listed in items 1 thru 4. 

1. A detailed site plan with easements, topography, existing and proposed grades, arrows indicating pre-construction and post-construction surface flow patterns and post development conditions.
2. An Erosion Control Plan with all required erosion control measures, details and Erosion Control Notes. 
3. A Site Utility Plan with existing and proposed systems.
4. Delineate the 100 year flood plain, sensitive areas, vegetated corridors, wetlands and significant natural resource area.

B. If one (1) or more acres of the site will be disturbed during the construction process, a DEQ 1200C Permit is required and five (5) copies of plans. Detailed submittal instructions may be found at the following web sites:

• http://www.deq.state.or.us/wq/stormwater/stormwater.htm
• http://www.cleanwaterservices.org/PermitCenter/PermittingProcess/ErosionControl.aspx

Prior to beginning work covered under the Permit:Oregon DEQ: Water Quality Permit Program - NPDES Stormwater Discharge Permits - Home

• The Erosion Control Permit must be approved.
• A Pre-construction Meeting is required to discuss site specific issue before starting the project.  The Permit is usually issued at the close of the meeting.  The Erosion Control Permit must be issued before other permits for the project can be released.

Who can I contact for additional information?

If you have additional questions or concerns in regard to grading and erosion control issues,
please contact Chuck Cummings at:
503-681-6255
or email at: chuckc@ci.hillsboro.or.us.

Public Works •150 E Main Street • Hillsboro OR 97123 • (503) 681-6255 • Email