General Notes: Site photographs with captions follow. Close:

Transcription

1 Photographic Journal for The Colony at American Village Subdivision Dry Detention Ponds One and Two 205 and 208 Regiment Way Durham, North Carolina Facility ID: and General Notes: Representatives of Harris Engineering have conducted multiple site visits between April and June 2012 to inspect two dry detention ponds associated with The Colony at American Village Subdivision (previously referenced as The Landings at American Village) in Durham, North Carolina. Our inspections were completed in accordance with generally recognized practices and information from the NCSU Stormwater BMP Inspection and Maintenance Certification Program. Based on the results of our inspection, it is our professional opinion that these stormwater control measures are operating as designed and intended. It is important to note that, prior to our inspection, the owners completed significant maintenance, at a total cost of approximately $7,200, to bring these devices into compliance with City of Durham standards. Recently performed maintenance generally consists of the following: Removal of sediment and debris from forebay and impoundment areas Stabilization of bare areas along embankments and the dam structures Removal of trash and debris from devices Sapling removal from dam structures It is also important to note that representatives of Harris Engineering conducted dry weather inspections of these BMP s during June. Based on the results of these inspections, Dry Detention Pond two is holding approximately 1 to 4 inches of water along the forebay and approximately 0 to 6 inches of water along the main impoundment area. In our professional opinion this minor standing water is acceptable because: Section of the NCDENR design standards indicates that the forebay must contain ponded water The ponding water along the main impoundment area is similar to low and high marsh areas observed along other extended dry detention basins in the Durham area Vegetation is beginning to establish along the pond bottom The device appears to have been constructed in general accordance with the design plans which carry a seal date of May 5, 2004 and as-built plans which carry a seal date of April 4, 2005 Site photographs with captions follow. Close: As always, we appreciate this opportunity to provide engineering services to our client. Should you have any questions regarding our inspection or reporting please feel free to contact me directly at Kind Regards, Brian E King, PE Director of BMP Services John W. Harris, PE Consulting Engineers, Inc.

2 Dry Detention Pond One: 208 Regiment Way Facility ID Overview Inlet Dissipater, Left Recently Stabilized Emergency Spillway, Right Well Constructed Rip Rap Berm, Left - Cat-tails at Base of Rip-Rap Berm, Right

3 Well Stabilization Dam Structure, Left Plunge Pool and Level Spreader, Right Inside Riser Structure - Inlet, Left Outlet, Right

4 Dry Detention Pond Two: 205 Regiment Way Facility ID Overview Wet Weather Inspection Dry Weather Inspection of Main Impoundment Area Low and High Marsh Areas Observed Vegetation Establishing

5 Dry Weather Inspection of Forebay Ponded Water along the Forebay in Accordance with NCDENR BMP Design Manual Inlet, Left Rip-Rap Berm, Right Main Impoundment Area, Left Recently Stabilized Dam Structure and Emergency Spillway, Right

6 Recently Stabilized Dam Structure, Left Cat-Tails Establishing on Ponds Edge, Right Horseshoe Rock Filter, Left Outlet Plunge Pool and Level Spreader, Right Close: As always, we appreciate this opportunity to provide engineering services to our client. Should you have any questions regarding our inspection or reporting please feel free to contact me directly at Kind Regards, Brian E King, PE Director of BMP Services John W. Harris, PE Consulting Engineers, Inc.