The Alpharetta City Council has approved an engineering consultant’s $75,520 proposal to draw up stabilization plans for four seriously degraded slopes along Big Creek near the Big Creek Greenway.
Tetra Tech, retained by the city in January 2018 to study erosion along Big Creek, identified smaller projects that could be handled by city parks crews or contractors without the need for permits, and larger repair or restoration projects that would require full design and permitting, staff said in a report to the council.
Four locations topped the list as “most critically in need of repair,” staff said. They are between Old Milton Parkway and the YMCA and show signs of severe stream bank erosion that threaten the Greenway trail and large trees.
“Tetra Tech will design and permit re-established stream banks with vegetated gabion walls and crib walls in these areas,” staff said. The effort includes obtaining city, state and federal permit approvals before the city can proceed to construction.
“Actual design work will only take a couple of months,” staff said. “Navigating the labyrinth of permitting through the U.S. Army Corps of Engineers and Georgia Environmental Protection Division will … (account for) the majority of the anticipated nine-month schedule.”
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