2019 WESTERN REGION PAVING PROJECT: DILLON BEACH ROAD
Location
Dillon Beach Road
City or County Responsible for Project
Merin County
Author
Rachel Calvert
Merin County
607 Davidson St
4152465017
Project Description
Marin County Public Works has been using sustainable pavement preservation and reconstruction methods with noteworthy success since 2010. The central focus of the pavement management plan continues to prioritize pavement preservation with a worst-second approach. Roads that have deteriorated too far to be mended with preservation, are reviewed for ways to improve the quality of roads in a cost effective and environmentally responsible way. This review includes careful considerations for using recycled materials in pavement treatments; and reutilizing materials in-place when reconstructing roads. The Dillon Beach Road Project (Project), completed in December 2020, showcases the benefits when properly applying this sustainable approach. The project limits started in the East in the small quaint town of Tomales and heading West to beautiful Dillon Beach. the pavement condition of nearly 4 miles of collector roads was rated as poor and exhibited widespread distresses and localized base failure. Cold in place recycling (CIR) was determined to be the most environmentally and fiscally responsible approach for the project. The Project included repurposing the top four inches of the existing asphalt concrete (AC) to create a strong subgrade and a two-inch wearing course of recycled hot mix asphalt (RHMA) was placed on the CIR AC. The traditional reconstruction method of removing and replacing the existing road materials was estimated to cost $1.8 million. The County’s sustainable reconstruction approach method of reutilizing the in-place materials was estimated to save $0.3 million and achieved significant environmental benefits: less construction workdays, less dust, and less traffic impacts, a reduction in GHG emissions, a reduction in energy consumption, and 12,000 tons of landfill reduction.
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