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HomeMy WebLinkAboutHILL POND ON SPRING CREEK SECOND REPLAT - Filed GC-GENERAL CORRESPONDENCE - 2004-08-10DATE TO CITY OF FORT COLLINS MEMORANDUM June 26, 1984 'Bob Smith, Assistant City Engineer - Storm Drainage Tom Hays, City Engineer THRU: Dave Stringer, Chief Construction FROM: Matt Baker, Construction Inspector RE: Hill Pond 2nd Replat Inspector I el I have run across a problem that requires our attention. At the intersection of River Meadows Drive and Whitcomb Street, there are two catch basins with a 21" RCP outfall line that drains into the pond on Spring Creek at the Arthurs Ditch. The ditch company keeps the level of this pond at 1' below the top of the dam. This is the normal elevation for the water. The catch basins were designed too low, and water from the pond flows from the catch basins onto the street. The outfall line stays full of water and leaches out, super -saturating the soil, causing an unstable subgrade. This area is so wet that it is unsuitable for paving. If the pond elevation is lowered temporarily for this area to drain and for pavement to be laid, then when the elevation of the pond is returned to normal I expect pavement failure within a year because of the wet conditions. Residents in the area have told me of flooding that occurs regularly in this area during rainstorms. Could we meet and discuss this problem? July 20, 1984 Be: Hillpond Job No. 84-273-026 City of Fort Collins Construction and Inspection Services 300 LaPorte Avenue Fort Collins, 80521 Attn: Mr. Matt Baker Dear Matt: The purpose of this letter is to inform you of the intentions of Victoria Ltd. for Hillpond Single -Family. As discussed in the meeting between myself, John Payne, Mark Ingemoen and yourself, the reason for the less than desirable condition of the sub -base on the piece of street known as River Meadows Drive is due to the inability of the storm sewer to pass water. This is the result of the rise of the water surface elevation in the dam adjacent to the property. It was a design error by the consultants who prepared the plans for the dam in not considering the effects of raising the water level. This continuous level of water does not allow for the sub -base material to dry properly. The means by which we will eliminate this problem is currently under design by our office. We are looking at continuing a storm sewer to the east beneath Arthur Ditch emptying into Spring Creek. This will allow the water surface to be lowered and therefore dry the sub -base material. However, due to the inability to construct such a storm sewer due to the irrigation season John Payne, has requested that we place 4," of concrete pavcarent in lieu of asphalt pavement. The extent this concrete pavement would be is from the approximate curb returns on the west end of the Whitccmh/River Meadows Drive intersection to the north to the approximate location of the transition from a 28' wide street to the existing width of Whitcomb Street. We feel that due to the capabilities of concrete pavement to withstand movement of the sub- base the section will endure longer than asphalt pavement. TARANTO, STANTON & TAGGE Consulting Engineers 748 Whalers Way • Building D • Fort Collins, CO 80525 (303) 226 0557 • Metro Denver Number (303) 595 9103 Page Two bir. Matt Baker City of Fort Collins July 20, 1984 Should you have any problems or questions with this item, please do not hesitate to contact our office. Sincerely yours, 'qxl-�� Rick R. Pickard, P.E. TARANTO, STANTON & TAGGE CONSULTING ENCDMaZS cc: Mr. John Payne - Victoria Ltd. Mr. Mark Ingemoen - City of Fort Collins, Storm water Drainage Dept. RRP:ses August 6, 1964 Re: Hillpond Job No. 84-273-026 City of Fort Collins Department of Engineering 300 LaPorte Avenue Fort Collins, Colorado 80522 Attn: Mr. Matt Baker Dear Matt: In talking with John Payne of Victoria Ltd. he informed me that you are in question at the sanitary sewer manhole proposed for Hillpond Single Family which was not installed. The purpose of this manhole was to provide a connection to the existing sanitary sewer line which would have served a sanitary sewer line from the Hillpond parcels south of Spring Creek. The original thinking of this line was to connect the Hillpond parcels to the existing sewer beneath Spring Creek. At the time, Spring Creek was to be iiproved to a trickle channel only. Now that Spring Creek is a dam on the east end, this is no longer feasible. The construction of this line would be tedious, time consuming and very expensive to have to contend with the dam. In talking with John Payne he informed me of the improvement plans to the east of the Hillpond area. These plans included a public street to go east and west eventually cutting into the Hillpord parcels south of Spring Creek. It is our intention at this tint, to abandon the previous idea and to pursue a sanitary sewer line from the Hillpond parcels going to this planned development. This would allow us to provide an easier means by which to traverse Spring Creek. Therefore, the manhole proposed originally to tie into River Meadow Drive will no longer be necessary. Should you have any questions regarding this or any other item related to Hillpord, please do not hesitate to call. Sincerel yours, ��Ze "7 Rick R. Pickard, P.E. TARANPO, STANTON & TAGGE CONSULTING ENGINEERS cc: Mr. John Payne - Victoria Ltd. RRP:ses TARANTO, STANTON & TAGGE Consulting Engineers 74B Whalers Way • Budding D • Fort Collins, CO 80525 (303) 226-055/ • Metro Denver Number (303) 595-9103 CITY OF FORT COLLINS STORM WATER UTILITY February 18, 1987 � _N Payne Builders Attn: John Payne 1006 Mirrormere Circle Fort Collins, CO 80526 Re: Hillpond on Spring Creek - Overflow Swale Dear John: This letter is to document our conversation from the meeting Friday, February 13, 1987. It was brought to our attention that an overflow Swale between Lots 19 and 20 of the above referenced development has not been built and existing conditions will not allow construction of the required Swale. The field survey conducted during our site visit concluded the apparent option is to locate the Swale along the north easement of Lot 21. The Swale will have to be designed by your engineer and a revision of the utility plan submitted to the City. The previous Swale was designed to carry the 100-year overflow of 42.5 cfs (Stormwater Drainage Report for Hill Pond on Spring Creek 2nd Filing, November, 1980). Items identified to consider in designing the new overflow are: 1. By changing the location of the overflow Swale, local stormwater will pond at the inlet an additional 0.63 feet before it enters the proposed overflow. 2. The southeast property corner of the lot north of Lot 21 is approximately elevation 4996.9, the water flow depth of the ion -year Swale should not inundate this property. 3. There is an historic Swale to the Arthur Ditch at this location, but it will be necessary to check with the ditch company prior to development of the Swale. STORM WATER UTILITY 300 LaPorte Ave. • P.O. Box 580 • Fort Collins, Colorado 80522 • (303) 221-6605 4. Landscaping or other markings are required so that the overflow swale is clearly defined. A trickle channel is not required if other means are used to identify the channel. If you have any questions or would like additional information, please let me know. Sincerely, Jan Kimzey Civil Engineer