RIVERDALE — Residents said they are worried as hearings continued on a closely scrutinized three-home development at the top of a mountain in a neighborhood known for crumbling rock walls and rock slides.
A vote on the application for the Hidden Hills or Dube Development, is expected at the next Planning Board hearing on Nov. 1. The plans are a variation on an application the Board denied in 2007. It's a three-lot subdivision on 12.5 acres off Mathews Avenue near the Butler border.
Access would be up Overlook Drive through the 31-home Enclave development and a cul-de-sac at the end of Skyview Terrace. Down below is Rock Creek Crossing, a town house development built in the late 1990s.
The specter of falling rock haunts homeowners there, particularly those who live in building C, behind natural rock walls.
"I literally lose sleep at the thought of this," said Jason Margelefsky, who lives on the ground floor of the building.
He and his neighbors remember when in 2005 a rock slide closed down Timber Ridge Road, one of two ways in and out of the development, for six months.
"Fortunately there are no houses on that side," he said. "If something like that were to fall that would be in my living room."
Geraldine Mondello, another homeowner in building C, said about a year and a half ago a 7-foot by 3-foot rock came down.
"We say it's the Tilcon," she said in reference to Tilcon New York which does regular rock blasting in a quarry a mile away. "But this work here is going to be right behind us and these rocks are going to come down."
More:Controversial 'Hidden Hills' hearings continue in Riverdale
More:Historian gives talk of 1930s Nazi camp in Bloomingdale
On the opposite side of the Hidden Hills property to the north is a rock wall that collapsed in 2011. The massive rock slide there closed Overlook Drive for three days, sealing off the main road to the 31 Enclave homes. A temporary road had to be constructed off High Street in Butler.
Professionals representing Hidden Hills gave repeated assurances the construction of the new homes would not disturb the rock wall and would not lead to a disaster. Rock will need to be removed from the site, but blasting will not be used, they said.
"There will be no damage to any rock wall because it is just too far away from where the work is to be done," the geo-tech engineer, Eugene Schwarzrock, testified.
He said the new homes would not add any additional stress on the rock face near building C. He also said boring and drilling will not disturb the rock on the Overlook Drive side.
Several questions were also raised about rain water and whether there would be an increase in water runoff, or a shift in how water flows towards the neighborhoods and rock walls below.
Patrick McClellan, the engineer for Hidden Hills, said the objective of the project is to have zero increase in runoff. He said steps were taken to protect the other properties and that there will not be an adverse impact. A dry well will be installed on the property to help manage water runoff.
The rock expert testified that water running off the Hidden Hills site will not be a problem.
"We are not changing the groundwater evolution," Schwarzrock said.
David Merritt, an attorney for the Rock Creek Crossing Condominium Association, was skeptical. Merritt, and an attorney for the Enclave at Riverdale Homeowners Association, continuously put several tough questions to the Hidden Hills experts over the course of the three hearings.
He said that the homeowners bought in to the risk of the natural conditions but, "they did not buy in to the risk of those conditions being worsened by the property above them changing the way that the water flows."