Info-CATO_250011_22-SF-0017p.pdf

STORMWATER MANAGEMENT AND SEDIMENT & EROSION CONTROL APPROVAL

STATE/FEDERAL PROJECTS

SEDIMENT & STORMWATER PLAN REVIEW DIVISION

MDE NUMBER: 22-SF-0017 APPROVED BY: for Program Manager, Sediment, Stormwater, and Dam Safety

EFFECTIVE DATE: April 14, 2022 (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: Catoctin Mountain Park

6602 Foxville Road Thurmont, MD 21788 Attn: Mr. Rick Slade

HEREINAFTER KNOWN AS OWNER,

FOR THE PLANS AND SPECIFICATIONS PRESENTED FOR: Contract No.250011

AI No.172411

Catoctin Mountain Park - Replace Parkwide Utilities - Frederick County

PREPARED BY: JACOBS Engineering Group, 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. The 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 must 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. This project has an earth disturbance of 1.0 acre or greater. Prior to any earth disturbance, notice of intent (NOI) application for the National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Associated with Construction Activity shall be submitted to and approved by MD

7. Stormwater management requirements for this project are being satisfied by stone swales and non-rooftop disconnections. A stormwater management waiver has been granted for the utility portion of this project in accordance with Section 3.3.A of the Maryland Stormwater Management and Erosion & Sediment Control Guidelines for State and Federal Projects. This project provides water quality treatment for a total of 0.17 acres of impervious area. The net increase in impervious area for the project is 0.17 acres. For MS4 accounting

22-SF-0017 Page 2 of 2 purposes, the resulting water quality treatment of reconstructed imperviousness is 0 acres. The MS4 Baseline was not considered as part of this approval. Final verification of all MS4 credits is the responsibility of the applicant.

8. Once construction is complete, as-built plans certified by a licensed professional engineer, land surveyor, or landscape architect shall be submitted to MDE/WSA for review and acceptance.

9. Maintenance shall be performed on stormwater management facilities in accordance with approved plans

CRH/JAS