COMCOR 19.10.02 Erosion and Sediment Control Rules and Regulations

C. The permittee must direct water run-off from any land disturbing activity through an approved sediment control measure.

D. The permittee must protect all points of construction ingress and egress to prevent the deposition of materials onto traversed public thoroughfare(s). This may be accomplished by installing and maintaining a stabilized construction entrance, or by washing all vehicle wheels in a safe disposal area. All materials deposited onto public thoroughfare(s) must be removed immediately.

E. The permittee must periodically inspect and maintain all erosion and sediment control measures in continuously effective condition until they are removed with permission from the Department.

F. The permittee must fence the perimeter of all temporary sediment basins or traps, which pond water in a pool greater than nine (9) feet in width or eighteen (18) inches in depth, with a safety fence greater than forty-two (42) inches in height and openings no greater than three (3) inches in width. The fence must be firmly anchored to posts no more than eight (8) feet apart and be constructed to prevent sagging.

G. All slopes steeper than 3:1, basin or trap embankments, and perimeter dikes must be stabilized with sod, seed and anchored straw mulch, or other approved stabilization measures, within seven (7) calendar days of establishment. Areas disturbed outside of the perimeter sediment control system must be minimized and immediately stabilized. Maintenance must be performed as necessary to ensure continued stabilization.

H. The permittee must apply sod, seed and anchored straw mulch, or other approved stabilization measures to all disturbed areas within fourteen (14) calendar days after stripping and grading activities have ceased on that area. Maintenance must be performed as necessary to ensure continued stabilization. Active construction areas, such as borrow or stockpile areas, roadway improvements, and areas within fifty (50) feet of a building under construction, may be exempted from this requirement, provided that erosion and sediment control measures are installed and maintained to protect those areas. During the months of November through February, when seeding and sodding are found to be impractical, an approved anchored mulch must be applied. In these cases, seeding must be completed prior to the following April 15.

I. Prior to removal of sediment control measures, the permittee must stabilize all contributory disturbed areas using sod or an approved permanent seed mixture with required soil amendments and an approved anchored mulch. Wood fiber mulch may only be used in seeding season where the slope does not exceed 10% and grading has been done to promote sheet flow drainage. Areas brought to finished grade during the seeding season must be permanently stabilized within fourteen (14) calendar days of establishment. When property is brought to finished grade during the months of November through February, and seeding and sodding is found to be impractical, an approved anchored mulch must be applied to critical areas. The final permanent stabilization must be completed prior to the following April 15.

J. The Department must inspect all permitted land disturbing activity, except where waived under Chapter 19, Subsection 19-12(g), and may require the permittee to obtain testing, special inspections, and professional certification, and/or to submit "as-built" plans to ensure that construction has been done in conformance with provisions of the approved plan and applicable standards and specifications. Where testing, special inspections, and professional certification, or "as-built" plans are required, reports documenting acceptability of the work must be submitted to the Department within a specified time.

K. The Department must withhold issuance of a completion certificate for release of the performance bond or other instrument for those projects requiring testing, special inspection, professional certification, and "as-built" plans until all of the above have been accepted by the Department.

L. When the approved erosion and sediment control plans include sediment basins, inspection is required at the following stages of construction:

1. Stripping of area under embankment;

2. Core trench excavation;

3. Installation of riser and pipe spillway;

4. Backfill of riser and pipe spillway;

5. Emergency spillway construction;

6. Outlet protection; and

7. Final stabilization.

Additional inspections may be required if needed to assure compliance with the approved plan and specifications. Construction must not proceed to the next stage until each inspection has been made and approved by this Department or inspected and certified as provided for in Chapter 19, Subsection 12(g). In either case, this Department must be notified twenty-four (24) hours prior to each required inspection.

M. The site, work, materials, plans, and test reports must be available at all times for inspection by duly authorized officials of Montgomery County.

N. Surface flows over cut and fill slopes must be controlled by either re-directing flows from traversing the slopes or by installing mechanical devices to lower the water downslope without causing erosion. Dikes must be installed and maintained at the top of cut or fill slopes until the slope and drainage area are fully stabilized.

O. Permanent swales or other points of concentrated water flow must be stabilized with sod, or seed with an approved erosion control matting.

P. Temporary sediment trapping devices must be removed within thirty (30) calendar days following establishment of permanent stabilization in all contributory drainage areas. Stormwater management structures used temporarily for sediment control must be converted to the permanent configuration within this time period as well.