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Conyers ups base layer requirement for residential streets in ordinance change
Summary
The council approved Ordinance 14-36 to increase graded aggregate base (GAB) thickness for residential streets to improve compaction and longevity; staff said some contractors already use deeper bases in troublesome soils.
The Conyers City Council approved Ordinance 14-36 to amend the city's geometric street design standards, changing the standard pavement section for residential streets to increase the thickness of the graded aggregate base (GAB).
Scott, speaking for city public works, said the current code required a 6-inch GAB for many residential street categories, but field experience shows 6 inches often loses compaction and can require contractors to place 10–12 inches in practice depending on subsoil conditions. Scott told the council the proposed change would "beef these up" to provide a more consistent base and extend pavement life; he added that a full street reclamation with soil-cement is another, more costly option for developers.
A council member moved to approve Ordinance 14-36 — an amendment to Chapter 6 of Title 8 to change subsection H of section 8-6-80 and the standard pavement sections table, to provide an effective date, repeal conflicting ordinances and waive the second reading. The motion was seconded and passed unanimously.
City staff said the revised GAB specification is intended to reduce premature failures on new residential streets and reduce long-term maintenance costs.
