How much will it cost to install and underground retention basin?
Tuesday, September 7th, 2010This is a commercial property and it will be located under a parking lot. Also, what size should I use. The property is about 1.5 acres. There is an existing structure on site, 85 by 125 ft wide, and another building is being proposed, 125 by 50 foot wide. Only 10% of the land will be used for landscaping.