Project Name: Alabama Power Company
Project Location: Mobile, Alabama
PROTECTING ENVIRONMENTALLY SENSITIVE WETLANDS
The Alabama Power Company (APC) planned a second substation to provide an alternative power source to Providence Hospital in Mobile, Alabama. However, wetlands adjacent to the project site impacted the plans as construction of an access road to install the substation and power line raised environmental concerns with officials and citizens. The US Army Corps OF Engineers (ACOE) also sought to minimize wetland disturbance and had strict requirements for limiting impervious areas.
A PERVIOUS ROAD SOLUTION
The head of APC’s stormwater environmental compliance, Pamela McDaniel, developed a plan that addressed concerns and complied with regulatory limitations. Because development to the wetland area required building a stormwater retention area along the right-of-way to retain the runoff, McDaniel suggested using the GEOWEB® Load Support System to stabilize aggregate for a permeable access road in the upland portion of the project. Unlike impervious hard-surface pavements, the GEOWEB system infiltrates water at a high rate, allowing stormwater to drain naturally into the soil. The City of Mobile accepted this solution, waiving its requirement for a retention pond at this site.
LOW IMPACT INSTALLATION
The power line from the substation to the hospital traversed a forested wetland on the south side of Providence Hospital. McDaniel noted that to ensure the wetlands were not disrupted by large machinery, workers cut out the foliage in the area by hand and hauled debris away via helicopter.
For installation of the utility poles, APC would normally load the poles onto trucks, deliver to a site, and then use excavators to bore holes for the foundation. To avoid undue impact to the area deemed ‘extremely sensitive’, the 70-ft. concrete transmission poles were brought to the site via a helicopter and guided into caissons by workers.
The new substation provided Providence Hospital with two sources of power to assure uninterrupted power in the event of failure at one.
By working together and utilizing the GEOWEB soil stabilization system, APC and the City of Mobile were able to accomplish the project goals:
- Allow access with a permeable roadway that infiltrates stormwater runoff.
- Minimize disturbance of the sensitive wetlands area.
- Adhere to the City’s and the ACOE’s requirements.
We are pleased this project was possible because of the GEOWEB System manufactured by Presto Geosystems. Patients and their doctors at the hospital will be confident power will not be disrupted just when it is most needed. This was a great service to the Mobile, Alabama area.” noted material supplier Skip Ragsdale, Sunshine Supplies, Birmingham, Alabama.