Second Addendum to Archaeological Survey of I-20 Eastbound Improvements from Columbia Drive to Panold Road

The proposed operational improvement project includes the addition of CD lanes, modification of general purpose lanes, and ramp improvements from approximately the 1-20/1-285 interchange to the 1-20/Panola Road interchange, for a total distance of approximately 4.5 miles, in DeKalb County, Georgia. The proposed project consists of constructing approximately 1.2 miles of CD lanes from 1-285 at 1-20 eastbound to Wesley Chapel Road. CD lanes to serve the CD system, an exit lane would be constructed from just east of the 1-20 eastbound off-ramps to 1-285. This exit lane would provide access from the 1-20 mainline to a 1.2-mile, three- to four-lane barrier-separated CD system originating at current location of the 1-285 on-ramps at 1-20 eastbound and continuing to Wesley Chapel Road. The CD system would be constructed by barrier-separating the two outside mainline lanes in the area (which currently exit to Wesley Chapel Road), and constructing one additional CD lane for lane balance at the Welsley Chapel Road eastbound exit. From the CD system, two lanes would exit to Wesley Chapel Road (one shared lane and one dedicated exit lane) and two lanes would continue eastbound on 1-20. The barrier separation between the CD system and the 1-20 eastbound general purpose lanes would end just west of Wesley Chapel Road. The proposed project would extend the existing third lane on the 1-20 eastbound on-ramp from 1-285, which currently drops after the merge with 1-20, approximately 1,700 feet into the new CD system. Therefore, initially, the CD system would contain four lanes-three from the 1-20 on-ramp from 1-285 and the new exit lane from the 1-20 eastbound mainline. The outside lane of the 1-285 ramp would be dropped after approximately 700 feet upon entering the CD system, and the resulting three-lane CD system would continue to Wesley Chapel Road. To allow for more desirable weaving and lane drop lengths and to satisfy lane balance, one of the lanes from the CD system would be dropped approximately 2,600 feet east of the Wesley Chapel Road on-ramp (just before Snapfinger Creek). The other CD system lane would continue approximately 1.7 additional miles and would be dropped at the Panola Road exit. The proposed project also provides for the construction of noise barriers/walls within the existing ROW of 1-20 (up to the existing ROW line) to reduce noise levels at impacted receptors. Noise walls would be constructed along the following communities and neighborhoods: On the north side of 1-20, the Snapfinger Golf View Townhomes (Gold Vista Circle), Friendly Hills Apartments and Snapwood Apartment Homes (off Snapfinger Woods Drive), and Snapfinger Manor Townhomes. On the south side of 1-20, the Rainbow Creek neighborhood (along Rainover Drive), Wesley Club Apartments (in the southeast quadrant of the 1-20/Wesley Chapel Road interchange), Village at Wesley Chapel Apartments (along Pleasant Point Drive), the Mayfair subdivision (along Treadway Drive), and in the area of the new subdivision being constructed off the west side of Miller Road. In the northwest quadrant of the 1-20/1-285 interchange, the community along Springrun Drive. In the southwest quadrant of the 1-20/1-285 interchange, the community along Charleston Terrace. To eliminate the need to acquire ROW and to reduce environmental impacts, various types of retaining walls and concrete barriers would be constructed as needed along 1-20 throughout the project corridor. Several types of retaining walls can be constructed, and may include cantilever walls, gravity walls, Lwalls, tie-back, and MSE. No existing bridge decks would be modified or widened. Impacts to bridges would be limited to reconstructing/reconfiguring bridge column protection and restriping of travel lanes and shoulders. In order to accomplish this, several design exceptions would be necessary for reduced lane and shoulder widths, as well as horizontal clearances. No ROW would be acquired for project implementation. Existing ROW varies between approximately 300 and 400 feet within the project area. Level 1 Intelligent Traffic System (ITS) Deployment, including detectors, closed circuit television (CCTV) cameras, changeable message signs (CMS), and associated communication infrastructure would be installed along 1-20 EB within the project limits as part of the proposed project. Installation of ITS features would occur entirely within the existing ROW.