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HomeMy WebLinkAboutCOTTONWOOD RIDGE SUBDIVISION - PRELIMINARY - 31-94 - CORRESPONDENCE - CITIZEN COMMUNICATIONMemorandum September 1, 1994 Page Three Eric Thayer stated that the City of Fort Collins was insisting on some kind of drainage plan. One option was to have a drainage ditch along the west side of Shields Street. I pointed out that we did not want drainage along the west of Shields Street to enter our ditch that leads to the siphon under Shields. I brought up the idea of putting a pipe under the driveway south of the siphon and running drainage water through this pipe on down the west of Shields Street to Fossil Creek. I did advise both Eric and Sanford Thayer that these are people who receive water from Headgate 138 other than those persons residing in the Applewood Subdivision. Since, Eric and Sanford Thayer did not get to meet Leon Hecht the afternoon of August 16th as originally planned, I had Leon give a date when he could be available (August 31st). Eric Thayer indicated that it was premature to try to meet with Mr. Hecht. Memorandum September 1, 1994 Page Two Eric Thayer wondered about using the concrete box now in use where the Applewood - Orchard ditch enters the pipeline through the Chelsea Ridge Subdivision. This is a question Mr. Hecht can best answer. Another matter of concern, to us is having access to the structure described in the preceding paragraphs as well as a 20 foot easement along the pipeline from Headgate 138 .to the junction with the Chelsea Ridge Subdivision. Eric Thayer stated that he wants the pipeline to follow the course of the existing ditch. I stated that we would like to avoid a sharp 90° turn where the Cottonwood Ridge pipeline .would join the Chelsea Ridge pipeline. Eric Thayer had a very good suggestion regarding this problem; namely join the two pipelines in -a few feet east of the concrete box at the north side of the Chelsea Ridge Subdivision where irrigation water currently enters the Chelsea Ridge pipeline. This suggested junction site for the two pipelines would still be in the 20 ft easement area and a sharp bend in the pipeline could be avoided. With regard to the kind of pipe to be used and installation time table, I outlined Mr. Hecht's recommendaations to us as follows: 1. Eighty pound, 15 inch PVC pipe (SDR51) with a wall thickness of 0.300 inch be used. This pipe should be buried deep enough in the ground to allow 30 - 36 inches of soil cover. 2. Installation of the irrigation pipeline needs to be done prior to installation of utility line and road so that the pipe can be laid on grade. Laying the pipe on grade is necessary since the irrigation water will have only a small "head" after allowing for loss of "head" due to friction as the water travels through the pipe. Laying the pipe on grade also cancels the need for air relief valves that would otherwise be required if the pipeline is not on grade. Should any of the pipeline go under roads, Mr. Hecht recommends putting the PVC pipe inside the concrete pipe required by the City of Fort Collins. Such a procedure followed in.the Chelsea Ridge Subdivision and greatly reduced the chance of leaks that might occur when one attempts to join PVC pipe to concrete pipe. Eric Thayer wondered if some other kind of pipe other than PVC pipe could be used. He was concerned about the thickness of the 80 pound PVC pipe. We were able to examine the 80 pound, 15 inch PVC pipe used in the Chelsea Ridge Subdivion where the pipeline exits. I indicated that I didn't know whether other kinds of pipe could be used, but that we definitely preferred PVC because of its durability and minimization of "head loss" and leakage problems. It can also be rapidly installed. September 1, 1994 MEMORANDUM OF RECORD SUBJECT: Cottonwood Ridge Subdivision - Irrigation pipeline from Headgate 138. On August 17, about 1:00 p.m. I met Eric and Sanford Thayer at Headgate 138, Pleasant Valley Lake and Canal Ditch. Initially Eric Thayer inquired as to our objective regarding the irrigation ditch, specifically did we want the entire ditch put into pipe to the siphon under Shields. I advised him that the Applewood Board would like to see irrigation water piped all the way to the siphon at Shields, but the property owner of the land south of the Chelsea Ridge Subdivision would not give us an appropriate easement. Our first discussion centered around Headgate 138 and I explained how Mr. Leon Hecht of H & S Irrigation suggested this headgate be modified. These modifications included the following steps: 1. Extending and building up the present retaining walls below the Headgate Valve #138. The final height of the two retaining walls should be equal to the highest part of the existing walls. 2. Place a concrete wall between the two concrete walls downstream from the headgate valve to form a "stilling" basin. 3. Place a metal Parshal flume between the retaining walls down- stream from the concrete wall mentioned in Item 2. 4. Place a drop structure downstream from the Parshal flume which would lead directly into the irrigation pipe. The purpose of this structure would be to insure that no accidental overflow could occur that would damage adjacent land and homes. Both Eric and Sanford Thayer and I heartily, agreed that we don't want any responsibility for the flooding of the proposed subdivision lands. An additional function of the strucure would be to provide the Pleasant Valley Lake and Canal Ditch Rider a means of measuring water diverted from the main ditch into the ditch served by Headgate 138. In regard to security around Headgate 138, Eric Thayer said they had in mind to put a chain link fence around the whole area. I mentioned that Mr. Hecht recommended that a cover be placed over the concrete structure downstream from the Headgate valve. Such a cover would keep trash and rocks from being thrown into the concrete structure. September 1, 1994 Mr. Eric Thayer 31741 RCR #35 Steamboat Springs CO 80482 Dear Mr. Thayer, Enclosed is a Memorandum of Record in which I have endeavored to summarize the topics I discussed this Mr. Sanford Thayer and yourself on August 17, 1994. I regret very much that you were not able to meet Mr. Leon Hecht, the H & S Irrigation representative. Mr. Hecht could have briefed you far more completely on required design features of an irrigation pipeline and the problems to be avoided than I was able to do. Best Regards, Applewood Homeowners Association Louis Ogden enclosure CC: Sanford Thayer 1827 Michael Lane Fort Collins CO 80526 CC: Leon Hecht c/o H & S Irrigation 23275 US Highway 85 LaSalle CO 80645 CC: Alan Bratschum Joe Eisele John Engle Mark Schultheiss Randy Wick Ann Yang