B08_24-SF-0145_FINAL_APPROVAL_0002.pdf

STORMWATER MANAGEMENT AND SEDIMENT & EROSION CONTROL APPROVAL

STATE/FEDERAL PROJECTS

SEDIMENT & STORMWATER PLAN REVIEW DIVISION

MDE NUMBER: 24-SF-0145 APPROVED BY: for Program Manager, Sediment, Stormwater, and Dam Safety

EFFECTIVE DATE: August 8, 2024 (Pursuant to Criteria Noted Below)

IN COMPLIANCE WITH: Environment Article, Sections 4-106 and 4-205 Annotated Code of Maryland

APPROVAL IS HEREBY GRANTED: National Park Service ADDRESS: 142 West Potomac Street

Williamsport, MD 21795 Attn: Mr. Joseph Reed, P.E.

HEREINAFTER KNOWN AS OWNER,

FOR THE PLANS AND SPECIFICATIONS PRESENTED FOR: Contract No. CHOH 320577

AI No. 182908

Replace Existing Stairway at Byron Bridge - Chesapeake and Ohio Canal NHP - Washington County

PREPARED BY: Vanasse Hangen Brustlin, Inc.

This APPROVAL is granted subject to the following conditions:

1. This Approval shall become null and void if the construction authorized herein has not been completed within three (3) years from the granting of this Approval, except that these limits may be extended at the discretion of the Department when requested by the owner or authorized agent.

2. This Approval is subject to all laws and regulations now in effect and may be revoked if it is subsequently determined that this authorization violates other laws of the State. Construction shall comply with approved terms.

3. The location and dimensions of all sediment control structures and stormwater management facilities, as well as grading, excavation, and filling shall be in accordance with plans approved by the Department of the Environment/ Water and Science Administration (MDE/WSA). The owner or authorized agent shall obtain written approval from the MDE/WSA for any plan modifications or changes. A copy of the approved plan with any approved modifications and this Approval shall be available at the construction site for reference during the construction period.

4. Off-site borrow or waste sites require local county and Soil Conservation District approvals if they are located on private property or MDE/WSA approval if on State or federal property. Local approval numbers shall be furnished to the MDE/WSA Inspector.

5. The Owner or his authorized agent shall notify the MDE/WSA Compliance Program at (410) 537-3510, at least seven (7) days prior to initiation of the project and five (5) days after work ends.

6. A stormwater management waiver has been granted for this project in accordance with Section 3.3.A of the Maryland Stormwater Management and Erosion & Sediment Control Guidelines for State and Federal Projects.

7. A portion of this project is located in a mapped Federal Emergency Management Agency (FEMA) 100-year floodplain. If the proposed work/construction activity changes or alters the FEMA 100-year boundaries or elevations, the Owner or his authorized agent shall be fully responsible for and required to contact FEMA and apply for a Conditional Letter of Map Amendment (CLOMR), which may necessitate a separate hydrologic and hydraulic study (determined by FEMA) before construction, and to complete the FEMA Amendment process with a Letter of Map Amendment or Revision (LOMR) after construction is completed. This includes coordinating and informing the local government/community.