2017-01-18_INSPECTION - M1992069

Home Browse Search

Boyd Irrigation Company February 2, 2006 Aggregate Industries Attn.: Connie Davis P.O. Box 337231 Greeley, Colorado 80633 Re: Boyd-Freeman Ditch Replacement at F Street(Hill) Property Dear Connie; This letter is to confirm your discussion with Tracy Kittell on January 31, 2006 in regards to the installation of pipe in place of an open ditch for a section of the Boyd- Freeman Ditch. It is my understanding that a portion of the ditch needs to be placed in a pipe instead of an open ditch due to space restrictions that will not allow a stable ditch section plus an access road. The section of the ditch you are proposing to pipe starts at the upstream end of the 30-inch diameter concrete pipe that has recently been installed under the railroad bridge and continues approximately 1300 feet upstream at a 0.2% grade. The contractor is proposing to use corrugated, smooth bore polyethylene pipe. If any of this is incorrect please let me know as soon as possible. Since pipe is going to be used in place of an open ditch there are several items that need to be addressed for construction: 1. To convey 11 cubic feet per second (cfs), City of Greeley's prorate portion of the ditch decree, the pipe diameter will need to be 24-inches (Attachment 1). The City would like to reserve the ability to convey up to 20 cfs which would require 30-inch diameter pipe. The City is willing to reimburse Aggregate Industries for the pipe material cost difference between 24-inch and 30-inch diameter pipe per the City's over-sizing policy. 2. The pipe needs to be installed per the attached Trench Cross-Section Detail and Trenching, Backfilling, and Compaction specification. 3. Six foot diameter Manholes will need to be installed approximately every 400 feet and at horizontal alignment changes for maintenance purposes. Manholes need to be installed per the attached Manhole details and specifications. 4. The connection to the existing concrete pipe needs to be accomplished using a cast-in-place concrete box with a poured channel. The box needs to be reinforced and a manhole cover shall be installed in the roof of this structure.