04-28-2025_22-SF-0202_FINAL_APPROVAL.pdf
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- Attached to
- Anacostia II WWPS Electrical Updates
- Solicitation number
- 107592
- Issued by
- Prince George's County, Maryland
About this file
This is a Stormwater Management and Sediment & Erosion Control Approval document issued by the Maryland Department of the Environment (MDE) for the Washington Suburban Sanitary Commission (WSSC) Anacostia II Wastewater Pumping Station (WWPS) Electrical Switchgear Upgrade project in Prince George's County. The approval authorizes construction work on Contract No. CP6901A20 (AI No. 175490) affecting 0.45 acres of land at coordinates 38.9153, -76.9357. The project involves the replacement and upgrade of the Anacostia II WWPS electrical system, including replacement of large medium voltage transformers, two switchgear line-ups and IPA enclosures, 13.8kV and 4.16kV switchgear with associated electrical protection systems, new backup battery systems, underground feeders and cables, new electrical manholes, HVAC systems in both voltage IPAs, structures and foundations for switchgear and transformers, new paving, stormwater control devices, and temporary power provision. WSSC is soliciting sealed responses for this work via their eProcurement Portal at https://procurement.opengov.com/portal/wsscwater with responses due prior to 2:00 pm on Wednesday, July 22, 2026.
The approval is effective April 30, 2025, and construction must be completed within three years from the approval date, with extension available at the Department's discretion. Stormwater management requirements are satisfied through two Filterra Plus Bioretention Filters providing water quality treatment for 0.14 acres of impervious area with no net increase in impervious area overall. A stormwater management waiver has been granted for the utility portion under Section 3.3.A of the Maryland Stormwater Management and Erosion & Sediment Control Guidelines for State and Federal Projects. The applicant must notify MDE/WSA Compliance Program at least seven days prior to project initiation and five days after completion, submit certified as-built plans following construction completion, and maintain all stormwater management facilities in accordance with approved plans. The approval is contingent upon compliance with all applicable Maryland environmental laws and regulations and the approved plan specifications.
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Text version
STORMWATER MANAGEMENT AND SEDIMENT & EROSION CONTROL APPROVAL
STATE/FEDERAL PROJECTS
SEDIMENT & STORMWATER PLAN REVIEW DIVISION
MDE NUMBER: 22-SF-0202 APPROVED BY: _________________________________for Program Manager, Sediment, Stormwater, and Dam Safety EFFECTIVE DATE: April 30, 2025 (Pursuant to Criteria Noted Below)
IN COMPLIANCE WITH: Environment Article, Sections 4-106 and 4-205 Annotated Code of Maryland
APPROVAL IS HEREBY GRANTED: Washington Suburban Sanitary Commission ADDRESS: 14501 Sweitzer Lane
Laurel, MD 20707 Attn: Mr. Austin Freeman
HEREINAFTER KNOWN AS OWNER,
FOR THE PLANS AND SPECIFICATIONS PRESENTED FOR: Contract No. CP6901A20 AI No. 175490 WSSC - Anacostia II WWPS Electrical Switchgear Upgrade - Prince George’s County
Latitude/Longitude: 38.9153, -76.9357 LOD: 0.45 acres
PREPARED BY: Phoenix Engineering 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. Stormwater management requirements for this project are being satisfied by two (2) Filterra Plus Bioretention Filters. This project provides water quality treatment for a total of 0.14 acres of impervious area. There is no increase in impervious area for the project. For MS4 accounting purposes, the resulting water quality treatment of reconstructed imperviousness is 0.14 acres. The MS4 Baseline was not considered as part of this approval.
Final verification of all MS4 credits is the responsibility of the applicant.
7. A stormwater management waiver has been granted for the utility portion of this project in accordance with
22-SF-0202 Page 2 of 2
Section 3.3.A of the Maryland Stormwater Management and Erosion & Sediment Control Guidelines for State and Federal Projects.
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
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