Observations/Finding

The site was visited by the undersigned AS Engineering and Consulting (ASEC) representative for the purpose of providing quality control inspection and testing services. Visual observation techniques were employed to assure compliance with project drawings/specifications, applicable codes, and materials submittals. The following observations were made on site today:

Upon arrival at Pickens Landing (located at 3600 Jim Moore Road), it was determined that the deceleration lane would be located in a former, long term drainage ditch.  This area had been prepared by the grading company Charles Pruitt Enterprises, Inc using A Caterpillar 320F excavator, Kubota Bobcat 75-2, & A Sakai CP-9 Smooth rolling compactor. 

A proof-roll was conducted – utilizing a loaded tandem-axel dump truck – along an area approximately 200 feet in length with a 50-foot taper at the southeast end of the deceleration lane adjacent to the road frontage.  The proof-roll continued past the main entrance for another 50 feet including the southwest area past the entrance to the northeast for approximately 15 feet with an additional 50-foot taper.  The width of the deceleration lane was 12 feet including an additional area for curbing.  

After the proof-roll displayed significant pumping and rutting, manual probing was found to display soft areas of more than 12 inches deep in the center continuing the length of the deceleration lane.  This area running (approximately 315 feet) was the former center of the aforementioned drainage ditch.  The soft area decreased to an 8-inch depth toward the edges of the lane. 

The area checked at the Entrance Lane (approximately 50 feet in length) was probed and found to exhibit soft to a depth of more than 2 feet as the proposed road entered the development.  This entrance area would be addressed separately.

Due to the concerns with the proof-roll a discussion was held with Ken Mosman and Ram Mogulla with ASEC.  A recommendation was made to undercut the entire deceleration lane by 12 inches.  A meeting was held with Chris, grading superintendent and Donnie and Brad the foremen for Charles Pruitt Enterprises, Inc.  The remediated area would be replaced with 12 inches of compacted graded aggregate base (GAB).  A sample was taken of the GAB materials used.  This sample will be returned to our laboratory in order to perform a moisture-density relationship (proctor).