Marsh Creek Lake Habitat Work

Following the completion of the Mariner East Pipeline System, Energy Transfer will soon begin habitat and restoration work in Marsh Creek Lake.

Scope of Work

Energy Transfer’s habitat and restoration work at Marsh Creek Lake will include:

• Replacement and construction of turtle and bird habitats in Marsh Creek Lake
• Removal of invasive wildlife species
• Removal of accumulated sediment deposits resulting from decades of stormwater runoff, as well as trace amounts of residual drilling mud resulting from an inadvertent return during pipeline construction

This work will result in enhanced water quality and increased aquatic life production in Marsh Creek Lake, increased water depth within Ranger Cove, and increased storage capacity of the reservoir.

Work is anticipated to begin in April and take approximately 8-12 weeks to complete from time of mobilization to demobilization.

The worksite to complete this restoration work will be staged on PA Department of Conservation and Natural Resources (DCNR) property, including an area north of Marsh Creek Lake and adjacent to Lakeview Road in Upper Uwchlan Township.

Site Prep

Prior to equipment mobilization, Energy Transfer contractors will install sediment and erosion controls around the construction access point and the equipment staging area. Crews will deploy dual turbidity curtains across the width of the cove prior to any work in the reservoir, enclosing the work area. All dredging work will occur within the turbidity curtains.

Sequence of Work

• 1. Mobilization of equipment and materials to worksite
• 2. Site preparation
  • a. Installation of erosion and sediment controls, turbidity curtains and temporary facilities
  • b. Establishing construction road access and sediment dewatering area
• 3. Dredge mobilization and setup
• 4. Complete dredging activity and dewater tubes used to pump sediment
• 5. Demobilize dredging equipment and remove from Marsh Creek Lake
• 6. Remove sediment from worksite and properly dispose
• 7. Remove turbidity curtains and demobilize remaining equipment
• 8. Restore worksite to better than previous condition

Dredging

Hydraulic dredging involves the use of a specially manufactured vessel equipped with a mechanical auger arm, which is deployed to the lake bed to remove sediment. Hydraulically dredged sediment will be pumped to an upland sediment management area to be dewatered using geotextile tubes. Sediment will then be loaded onto trucks to dispose off-site at an approved disposal facility. Crews will use a small, barge-mounted hydraulic dredge system, which has the ability to walk, to dredge shallow areas of Ranger Cove.

All facilities will be temporary, and all upland areas will be restored back to existing conditions, grades, and elevations following this work.