Property in Twain Harte, CA
Case Study
Client
Property in Twain Harte, CA
Sector
Industrial
Location
Twain Harte, CA
Before
This steep mountain access road has a 24% grade at its steepest area. Access becomes extremely difficult during rain and/or snow events. Both concrete and asphalt options proved too expensive for the owner, and a gravel road would not work because the gravel would migrate.
Preparation
Objectives:
1. Improve accessibility and safetyregardless of weather conditions.
2. Create access for firetrucks, emergency vehicles, and snow plows.
Approach/Solution:
ASTM Testing shows that E40 supports over 300% the minimum fire truck loading.
Additionally, E40 was significantly less expensive than traditional surfacing systems. It was for these reasons that the customer chose this solution.
Installation
Ecoraster E40 was installed on this access road. Each sheet of Ecoraster contains 12 individual pieces of E40. Each sheet was pinned to the decomposed granite subgrade with 3/8in rebar bent into a “fish hook” style fastener with a 12in long end. Two pins were installed to each sheet to prevent sliding of the E40 on this steep grade. The road was completed in 3 days: On day 1 it was graded; on day 2 the grid was placed by 4 people; and on day 3 it was filled with rock.
After
This driveway has greatly improved access to this property and has withstood multiple rain and snowstorms. The customer has plowed this driveway on multiple occasions and regardless of the steep gradient, this roadway remains firmly secured to the subgrade and is accessible by all required vehicles. Of even greater significance is that the owner experienced a clogged culvert during a 2″ rain storm which resulted in erosion and flooding on the property. However, water was able to flow through the Ecoraster and the road was unscathed!
Project Gallery
Explore the photos below that highlight how Ecoraster products were installed, as well as the results we were able to achieve for the park.