"When I investigated the site, I found that the cave-in was not due to a geotechnical problem, it was the result of a failed drainage pipe caving in 30 feet under the parking lot," said Robert Mastandrea, Cedar Realty corporate director of special operations.
had no direct experience with slip lining at the time, Mastandrea
had heard of it, and thought it might be a good solution for the situation at The Point.
He explored the local market for a contractor with slip lining capability, and decided to contact Aaron Enterprises.
"Aaron engineers visited the site, evaluated the situation, and then recommended the slip liner approach," Mastandrea
"The firm was also equipped to shore up the cave-in, and could handle the re-paving requirements, so we had a single bid opportunity."
Instead of having to cut an 800-foot open trench that would disrupt a large portion of the parking lot, which sometimes accommodates several thousand cars per day, Aaron dug a relatively small working pit (approximately 12 feet by 40 feet) at the far end of the lot, from which they slipped the liner into the drainage pipeline.
The original 42-inch-diameter drainpipe was lined with a 32-inch HDPE insert.
"This approach saved us a lot of problems with business disruptions of the retail stores," Mastandrea