WET WEATHER EROSION CONTROL MEASURES (October 1, 2007 thru April 30, 2008)

The City of Forest Grove and Clean Water Services (CWS) would like to remind you of the importance of installing and maintaining WET WEATHER EROSION PREVENTION MEASURES on your development site.

Preparation should begin now in order to have wet weather measures established and effective throughout the winter months. Each year, wet weather measures must be established by October 1st and remain effective through April 30th of the following year. The approved erosion control plans for your project contain specific details and information pertaining to wet weather measures that must be implemented on your site. Erosion control perimeter or base measures do not constitute wet weather protection. General descriptions of some of the measures for wet weather erosion control prevention are listed below. If you have any questions regarding the specific wet weather measures to be installed, please contact the Engineering Division for additional assistance.

City and CWS require strict compliance with current CWS regulations and wet weather measures outlined in the erosion control plans for your property and/or construction site. Failure to comply may result in the issuance of a Stop Work Order and/or Civil Citation. The Civil Citation carries a maximum penalty of $1,000.00 per day per violation and possible revocation and suspension of permits.

Please pass this information on to your contractor and sub contractors.

Wet Weather Erosion Control

Any slope 2% or greater must have ground cover protection measures in place by October 1. Grass seed application either by hand or mechanical hydro seeding will not provide adequate ground cover protection unless maximum germination is reached by October 1. If seeding is unsuccessful, additional ground cover measures such as straw, yard debris compost, or erosion control blankets must be installed. Any stockpile of gravel or soil must be covered at the end of the workday and as severe weather approaches.

All erosion control facilities and techniques contained in the approved erosion control plan for your site need to be checked and maintained regularly. If the facilities and techniques are not effective, additional measures must be implemented. Information regarding maintenance can be found in the Clean Water Services Construction Standards, Chapter 8, Section 8.03.3.

Information regarding approved measures and installation procedures is contained in the Erosion Prevention and Sediment Control Plans, Technical Guidance Handbook. If you do not have a copy of this document, you may purchase one by contacting Clean Water Services at 503-846-8621 at a cost of $30 per manual, including shipping. The manual is also available online at CWS website at www.cleanwaterservices.org.