2018-113 Milling StorageDate: August 31, 2018 Report No. 2018-113
INFORMAL STAFF REPORT
TO MAYOR AND CITY COUNCIL
SUBJECT:
Council Member Briggs made a request during the August 24 Council Meeting for information
on the use of rubble and milling material at the landfill.
EXECUTIVE SUMMARY:
The Capital Projects Department uses the City’s landfill to store excess materials created during
reconstruction and mill and overlay projects. Some of the milling byproduct can be reused for
other capital projects. The current milling pile at the landfill consists of 10% or less material that
is usable for new roads.
BACKGROUND:
The age of Denton’s street network can create issues when attempting to reuse milling materials
on new street projects. Older roads have a thinner asphalt layer (2-3 inches). When the Capital
Projects Department reconstructs older roadways, they typically mill off 7 or more inches, which
is the most cost-effective way to remove material at one time. This process causes subgrade
product to be mixed in with the asphalt millings. This material then needs to be sorted before it
can be reused in new asphalt. The sorting process requires a lot of space to be conducted
property. The landfill does not currently have the space needed to conduct the sorting process.
The Streets and Drainage divisions are actively working with the Real Estate division to locate
other city-owned properties for storage/sorting areas. Once a site has been identified, materials
will be sorted as they are unloaded from the truck.
Capital Projects has coordinated with other departments to use milling materials for other City
projects. Some of the uses include: temporary backfill during construction projects, ditch line fill,
dust control for rural roads, and temporary roads/parking lots. Through these alternate uses,
Capital Projects has significantly reduce the amount of milling material it hauls to the landfill.
CONCLUSION:
As the City continues enhance the quality of its roadway infrastructure, the sorting issue
associated with current milling material will greatly diminish. The City of Denton’s new
roadway standards have thicker pavement (6”-9”), which allows the Capital Projects Department
to only pull asphalt when milling a street. The new roadway standards reduce the amount of
sorting and sorting space needed. As the condition of Denton’s roadway network improves, staff
will continue to identify alternate uses to reduce the current milling pile at the landfill.
Date: August 31, 2018 Report No. 2018-113
STAFF CONTACT:
Daniel Kremer
Deputy Director of Operations
Capital Projects Department
(940) 349-7193
Daniel.Kremer@cityofdenton.com