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Examples of permanent erosion control measures include but are not limited to the following:
7C.01a Ground Cover. After construction is complete, all disturbed areas shall receive a permanent ground cover in accordance with the seeding and mulching schedule in Table 7-1: Seeding and Mulching. Permanent seeding and temporary seeding differ only in the type of seed to be used - annual versus perennial.
7C.01b Mulch. Mulch is a temporary ground cover intended to provide temporary erosion prevention and promote growth of vegetation. Mulch may only be used as a permanent ground cover in the beds of installed landscaping with an accompanying landscaping plan and for land disturbance activities that are exempt from provisions of the erosion prevention and sediment control regulations as specified in the Unified Development Ordinance.
7C.01c Disturbed Stream Buffers. All areas disturbed within the vegetated buffer of intermittent and perennial streams shall receive permanent ground cover and/or buffer re-vegetation as specified herein.
7C.01d Permanent Ground Cover. Permanent Ground Cover is the establishment of perennial vegetation cover for periods longer than 12 months. Seed bed preparations and soil amendments shall be in accordance with “Table 7-1: Seeding and Mulching”. As a part of permanent seeding, maintenance may be required to maintain vegetative growth for 12 months. This maintenance shall be considered a part of establishing permanent ground cover.
7B.01e Energy Dissipaters. All Energy dissipater shall be designed and installed in accordance with Section 8 - Stormwater.
All computations and assumptions used to formulate an erosion control plan shall be reviewed by the City Engineer or his/her designee and in compliance with the applicable City Ordinances to verify their sufficiency.
Erosion and sedimentation control measures, structures, and devices shall be planned, designed, and constructed to control the calculated peak runoff from a 10-year frequency storm. Steep slopes construction may require a higher design standard. Runoff rates shall be calculated using the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Method, the Rational Method, or other acceptable calculation procedures. Runoff computations shall be based on rainfall data published by the NCDENR Erosion and Sedimentation Control Planning and Design Manual for this area. The Rational Method may be used for drainage areas up to 20 acres (for stormwater calculation purposes the NRCS method must be utilized).
The construction sequence on projects shall include the following essential criteria or equivalent sequence in the priority shown below:
1. Submit plans for review;
2. Obtain grading permit (may include preconstruction conference);
3. Submit four (4) copies of stormwater component shop drawings at or prior to the preconstruction meeting and receive approval by the City of Asheville prior to ordering materials.
4. Install all erosion control measures as shown;
5. On-site inspection by Inspector to approve perimeter erosion control devices;
6. Proceed with grading;
7. Clean sediment basins when one-half full;
8. Repair or replace all erosion control measures as needed;
9. Seed and mulch denuded area, as required, after finished grades are established;
10. Maintain soil erosion control measures until permanent ground cover established;
11. Request final approval by Construction Inspector; and,
12. Remove all temporary soil erosion control measures and stabilize these areas.
As-builts or closeout documents shall not be required provided the project does not include the installation of storm drainage piping or stormwater detention/retention facilities. If storm drainage piping or stormwater facilities are included see “Section 8” for as-built record drawing and closeout document requirements.