7D.01 Scope

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).

7E Construction Sequence

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.

7F Formal Plan Submittal Requirements

See “Appendix C: Requirements for Formal Grading, Erosion Control, and Stormwater Plans.

7G As-Built and Closeout Document Requirements

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.