City of Sumter

(a) The city shall provide procedures to ensure that deficiencies indicated by inspections are rectified. The procedures shall include the following:

(1) Notification to the person responsible for maintenance of deficiencies including a time frame for repairs;

(2) Subsequent inspection to ensure completion of repairs; and

(3) Effective enforcement procedures or procedures to refer projects to the commission if repairs are not undertaken or are not done properly.

(b) Construction maintenance. All BMPs and other protective measures identified in the OS-SWPPP must be maintained in effective operating condition. If site inspections required by section 82-196 identify BMPs that are not operating effectively, maintenance must be performed within seven calendar days, before the next inspection, or as reasonably possible, and before the next storm event whenever practicable to maintain the continued effectiveness of stormwater controls. If periodic inspection or other information indicates that a BMP has been used inappropriately, or incorrectly, the permittee must address the necessary replacement or modification required to correct the BMP within a time frame of 48 hours of identification. If existing BMPs need to be modified or if additional BMPs are necessary to comply with the requirements of the permit and/or the state’s water quality standards, implementation must be completed before the next storm event whenever practicable. If implementation before the next storm event is impracticable, the situation must be documented in the OS-SWPPP and alternative BMPs must be implemented as soon as reasonably possible. Sediment from sediment traps or sedimentation basins must be removed as indicated in the OS-SWPPP or when the design capacity has been reduced by 50 percent, whichever occurs first. Sediment collected by silt fences, or another sediment control measure, must be removed when the deposited sediment reaches one-third of the height of the above-ground portion of these BMPs, or before it reaches a lower height based on the manufacturer’s specifications.

(c) Permanent maintenance. Permanent stormwater management structures must be routinely maintained to operate per design. The city requires inclusion of a permanent stormwater management maintenance agreement and a maintenance plan to ensure proper operation. Provide a detailed proposed maintenance plan for permanent stormwater management structures proposed for the project in the narrative. The maintenance agreement and maintenance plan, when required, must be identified and located in the C-SWPPP.

(d) Maintenance agreements. Permanent stormwater management maintenance agreement must meet the following information as a minimum:

(1) Signed notarized agreement from the responsible party or individual accepting ownership and maintenance of each permanent stormwater control device/structure, including any permanent LID and/or proprietary control devices (oil-water separators, etc.), underground detention structures, exfiltration systems and nontraditional stormwater controls (constructed wetlands, bioretention, etc.) incorporated into the construction process.

(2) A generic template of a maintenance agreement may be found at www.scdhec.gov/environment/ocrm/docs/SW/pond_maint.pdf.

(3) This template may be modified to identify each permanent structure for the applicant’s project.

(4) The city must be notified in writing of any changes in maintenance responsibility for the stormwater devices at the site (include this statement in agreement).

(e) Maintenance plans. All maintenance plans must meet the following information as a minimum:

(1) Description of maintenance plan to be used.

(2) Make sure that detailed or manufacturer-specific maintenance procedures are included for any permanent LID and/or proprietary control devices (oil-water separators, etc.), underground detention structures, exfiltration systems and nontraditional stormwater controls (constructed wetlands, bioretention, etc.) incorporated into the construction process.

(3) Identify each maintenance activity (e.g., inspection, mowing, removing debris, etc.) to be completed. Typical maintenance items to be addressed include but not limited to:

a. Grass to be mowed;

b. Trees to be removed from within the pond and on the embankment;

c. Trash and sediment to be removed from inside of and around the pond outlet structure;

d. Orifices to be cleaned and unclogged;

e. Outlet pipe to be cleaned, inspected, and repaired;

f. Sediment accumulation to be removed from pond;

g. Pond bottom to be regraded to provide proper drainage towards the outlet discharge point;

h. Energy dissipator to be cleaned and repaired;

i. Emergency spillway, if applicable, to be inspected and repaired; and

j. Erosion on side slopes, if present, to be addressed.

(4) Schedule or frequency for completing each maintenance activity of maintenance procedures (e.g., every six months).

(f) Secondary permittee common BMP maintenance requirement. It shall be the responsibility of the secondary permittee to either maintain or coordinate the maintenance of any common stormwater BMPs, accepting stormwater discharges from any area associated with their work, with the primary permittee or the party responsible for permanent maintenance.