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10.30.020 Minimum Requirements.

(Amended by Ordinance No. 179690, effective November 18, 2005.) The following minimum requirements apply to all development and ground disturbing activities.

A. Purpose

1. No visible and measurable sediment or pollutant shall exit the site, enter the public right-of-way or be deposited into any water body or storm drainage system.

2. Depositing or washing soil into a water body or the storm drainage system is prohibited.

3. Ground disturbing activities requiring a permit shall provide adequate public notification of the City’s Erosion Control Complaint Hotline.

B. Requirements and Standards. In order to meet the purpose set forth in Subsection A. above, the responsible party shall do all or any of the following:

1. Install measures intended to keep soil on site or out of water bodies, storm drainage systems or the public right-of-way as the first step in any development. These measures shall be made functional prior to any upslope development taking place.

2. Remove any soil that enters the public right-of-way.

3. Protect stormwater inlets that are functioning during the course of the development by approved sediment control measures so that sediment-laden water cannot enter the inlets without first being filtered.

4. Apply permanent or temporary soil stabilization to denuded development site areas in conformance with the following schedule. Permanent non-permitted ground disturbing activities may achieve compliance with this schedule by installing and maintaining approved permanent Best Management Practices (BMPs) that meet the purpose of this Title.

a. Between October 1 and April 30, all denuded sites shall be provided with either temporary or permanent soil stabilization as soon as practicable, but in no case more than two days after ground disturbing activity occurs.

b. Between May 1 and September 30, temporary erosion and sediment control measures to reduce dust and sediment transport shall be applied as soon as practicable, but in no case more than seven days after ground disturbing activity occurs.

c. Ground cover shall be installed on any portion of a site that is denuded for more than six months. Sports fields or playgrounds surrounded by vegetative cover or permanently installed curbing are exempt from this requirement.

d. Temporary measures shall be maintained until permanent measures are established.

e. Ground disturbing activity taking place between October 1 and April 30 for sites located in the Balch Creek Subdistrict of the Northwest Hills plan district is prohibited, and is not subject to Alternate Methods review per Section 10.40.040. (See Chapter 33.563 of the City of Portland Zoning Code.)

5. Plant replacement vegetative cover that does not include plants listed in either the Nuisance or the Prohibited Plant List, as set forth in the City of Portland Plant List. Permanent non-permitted ground disturbing activities are exempted from this requirement.

6. Secure or protect soil stockpiles throughout the project with temporary or permanent soil stabilization measures. The responsible party is accountable for the protection of all stockpiles on the site, and those transported from the site. Depositions of soil may be subject to additional regulations requiring permit, review or erosion and sediment control.

7. Select BMPs from the Erosion Control Manual.

8. Post signage on the site of the permitted ground disturbing activity that identifies the City’s Erosion Control Complaint Hotline number or the responsible City project manager/inspector. Permanent non-permitted ground disturbing activities are exempted from this requirement.

a. Post a sign on the site that is clearly visible from the right-of-way. The sign shall be at least 18" by 18" and made of materials that shall withstand weather for the duration of the project. Lettering shall be at least 3" high and easily readable. Signs shall be color coded or otherwise marked to identify the appropriate enforcing bureau; or

b. Another visual notification method approved by the Director of the designated enforcing bureau.

9. Demonstrate that any trench dewatering and trench spoils will be managed onsite or provide discharge approval from the Bureau of Environmental Services for offsite discharge.

10. Identify sites where potential pollutants will be stored, used, or disposed. Such sites must provide adequate containment to prevent the release of non-soil pollutants.

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