Concerns about nearby wetlands have prompted officials at the Matthaei Botanical Gardens to contain water and oil runoff by repaving driveways.  According to Bob Grese, SNRE professor and director of the Botanical Gardens, the gravel that initially replaced asphalt exacerbated problems instead of absorbing runoff as intended.  By repaving with asphalt and managing additional rain gardens and vegetation, Grese says officials will "try to handle some of the water before it runs into the stream."