Addendum to the Phase I Archaeological Survey of the Operational Improvements Along SR 400 at CR 9284/Windward Parkway in Fulton County, Georgia

Proposed Improvements: The proposed project would make improvements to the existing intersection of SR 400/US 19 and Windward Parkway in the city of Alpharetta, Fulton County, Georgia. The proposed project would construct a triple left turn lane on the SR 400/US 19 northbound exit ramp to Windward Parkway and widen Windward Parkway from the SR 400/US 19 northbound exit ramp westbound to Westside Parkway/Deerfield Parkway. The additional lane on Windward Parkway would be dropped at Deerfield Parkway as a right turn only lane. A bicycle lane would be provided with the improvements on Windward Parkway and would connect into the existing bicycle lanes along Windward Parkway. A second westbound left turn lane on Windward

Parkway would be constructed at the Westside Parkway intersection. The proposed project would also construct a 1,900-foot outside shoulder on SR 400/US 19 northbound at the Windward Parkway exit ramp adjacent to where the existing paved shoulder was recently converted to a flex exit lane. This would allow for the flex lane to be fully utilized as an optional exit lane and would create a permanent multi-lane exit from GA 400/US 19 northbound onto Windward Parkway. The total project is approximately .72 mile along SR 400/US 19, and approximately .63 mile along Windward Parkway.

Existing Conditions: Currently, the SR 400/US 19 northbound exit ramp onto Windward Parkway has one optional exit lane and one flex auxiliary lane that previously served as the paved outside shoulder. The flex lane ends immediately south of the ramp divergence. North of the gore area, the ramp widens to four lanes (two left turn lanes and two right turn lanes). The ramp within this location has an inside paved shoulder width of 8 feet and outside paved shoulder width of 12 feet. The existing right-of-way (ROW) along SR 400/US 19 northbound exit ramp along varies between 305 feet and 905 feet.

Westbound Windward Parkway currently has two 12-foot wide travel lanes, a 4-foot wide bicycle lane, and 12-foot wide right turn lanes at two commercial driveways and at the intersection with northbound Deerfield Parkway. There are existing 12-foot wide single left turn lanes on westbound Windward Parkway at a signalized intersection with a commercial driveway and at the intersection with southbound Westside Parkway. Windward Parkway at the intersection with Westside Parkway has existing 12-foot wide single left turn lanes and right turn lanes for the eastbound and westbound approaches, and a 4-foot wide bicycle lane on both approaches. Westbound Windward Parkway currently has an urban shoulder with a minimum width of 10 feet and a 5-foot wide sidewalk, which has an offset from the back of curb that varies from 2 feet to 30 feet. The existing ROW along Windward Parkway varies between 105 feet to 168 feet, and between 105 to 125 feet at Deerfield and Westside Parkway.

Proposed Project: The proposed project begins along the SR 400/US 19 northbound travel lanes, approximately 3,800 feet south of intersecting Windward Parkway where the existing outside flex lane would be converted into an auxiliary lane. A 14-foot wide outside shoulder approximately 2 1,900 feet in length would be constructed from the beginning of the project limits adjacent to the existing flex lane and ending 100 feet south of the gore area, where the shoulder would tie into the existing paved shoulder. A third left turn lane with a storage length of 785 feet and inside paved shoulder would be constructed on the SR 400/US 19 northbound exit ramp. No additional ROW or easement would be required along SR 400/US 19 mainline or the SR 400/US 19 northbound exit ramp.

Along Windward Parkway a third through lane with a bicycle lane and urban shoulder would be constructed along westbound Windward Parkway from the intersection at the SR 400/US 19 northbound ramp terminus to the Deerfield Parkway/Westside Parkway intersection. At this point, the third through lane would drop into a right turn lane onto northbound Deerfield Parkway. Additionally, a second southbound left turn lane on westbound Windward Parkway with a storage length of 400 feet would be constructed at the Deerfield Parkway/Westside Parkway intersection.

The existing raised median at this location would be extended 500 feet to the stop bar for the proposed dual left turn lanes. The proposed ROW along Windward Parkway and at the intersection with Deerfield and Westside Parkway, which includes minor additional required ROW, cut-andfill limits, permanent easement, and temporary driveway easement from properties along Windward Parkway, varies between 5 feet and 75 feet.