0019617 Project_Synopsis FINAL.pdf

PI No. 0019617 Page 1

The Chattahoochee River Trail Project, Phase II

PI Number: 0019617 Cobb DOT Project No. B2432

Cobb County, GA

Date: September 10, 2026 Disclaimer:

• Please be advised that this information is preliminary and is provided for information only. Additional details, requirements, and other pertinent information concerning the Project will be included in the Request for Proposals (RFP). The advertised bid documents shall supersede this Project Synopsis and accompanying Public Notice Advertisement (PNA). All final scope requirements will be included in the RFP.

Project Information:

• Cobb DOT is seeking to contract with a Design-Builder to provide design and construction services necessary to construct a bike and pedestrian trail along the Chattahoochee River in Mableton, Cobb County, GA. The project begins at the southwestern quadrant of the intersection of SR 139/Mableton Pkwy and Lee Industrial Blvd and continues under the SR 139 roadway bridge crossing the Chattahoochee River and along the River to Nickajack Creek. The project consists of 10’-17’ shared use path with intermittent modal separation. A bridge is proposed over an unnamed creek. Boardwalks will be used over wetlands and other environmentally sensitive areas. Untreated stormwater outfalls will be treated with nature-based stormwater Best Management Practices to improve water quality and reduce erosion. The total length of the project is approximately 1.3 miles.

• Provide design, permitting, utility coordination and/or utility relocation, construction, and any other related services necessary to build the Project.

The following information applies to the Project:

Project Category:

• The Georgia Department of Transportation (Georgia DOT) has developed a project ranking system to categorize Design-Build projects representing varying levels of complexity and risk ranging from low to high. The category determines the post-let delivery requirements for each project. These submittal requirements are based on the information needed to communicate and document the Design-Builder's management and construction plan. The Project, Chattahoochee River Trail, Phase II, PI: 0019617, will be a Category 1 project. The general submittal requirements for a Category 1 project can be found in the following memo http://www.dot.ga.gov/PartnerSmart/Innovative/DesignBuild/DBProjectScalability.

pdf.

http://www.dot.ga.gov/PartnerSmart/Innovative/DesignBuild/DBProjectScalability.pdf http://www.dot.ga.gov/PartnerSmart/Innovative/DesignBuild/DBProjectScalability.pdf

PI No. 0019617 Page 2

Environmental:

• The National Environmental Policy Act (NEPA) environmental document is a

Categorical Exclusion (CE) that is currently in the final preparation and review phase. This CE has not been approved as of the above date.

• The NEPA environmental document is anticipated to be approved by February 24, 2027.

• It is anticipated that the Design-Builder will be responsible for obtaining an approved reevaluation of the NEPA document prior to issuance of NTP3.

Permitting:

• All site erosion control Best Management Practices (BMPs), including obtaining any stream buffer variances, will be the responsibility of the Design-Builder.

Geotechnical Scope of Work:

• Cobb DOT will provide readily available geotechnical information, e.g., existing Phase I and Phase II Environmental Site Assessment (ESA) reports and a Limited Boring Plan, as RIDs in the RFP.

• The Design-Builder will be responsible for obtaining a Soil Survey, Bridge Foundation Investigations (BFIs), and Wall Foundation Investigations (WFIs) as necessary.

Survey Scope of Work:

• Cobb DOT will provide a Survey Control package as an attachment to the RFP.

• Cobb DOT will make available a survey database as a Reference Information Document (RID).

Critical Path Method:

• Cobb DOT anticipates using a Critical Path Method (CPM) schedule requirement for this Project.

Utility Scope of Work:

• This project will not be a Public Interest Determination (PID).

• The Design-Builder will only be responsible for coordinating and/or relocating all Cobb County Water System utilities. Design-Builder shall use Cobb County Water System pre-qualified contractor.

• The Design-Builder will not be responsible for coordinating and/or relocating any other affected utilities or obtaining no-conflict letters from any utility owners. Cobb DOT will have the right to approve all utility adjustments.

• Cobb DOT will obtain executed encroachment agreements from Cobb County Marietta Water Authority utility owner and will include them in the RFP.

Traffic Control Scope of Work:

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• An offsite detour will not be allowed for this Project.

Right-of-Way (ROW) Scope of Work:

• Cobb DOT anticipates that no additional ROW is required for this project.

MS4 Permit:

• The Design-Build Team will be responsible for determining MS4 feasibility and meeting the Cobb County permit requirements.

Additional Comments:

• N/A