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HomeMy WebLinkAboutCENTURY WIRELESS TELECOMMUNICATIONS FACILITY - FDP - FDP180022 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE RELATED DOCUMENTDrainage MEMO Century, PDP170017 June 14, 2017 Page 1 of 2 5545 West 56 th Ave, Unit E, Arvada, CO 80002 o) 303.566.9914 www.tepgroup.net Water Utilities Engineering City of Fort Collins 117 N. Mason Street Fort Collins, CO 80524 (970) 224-6065 Subject: Drainage MEMO Site: Century, PDP170017 620 Horsetooth Rd, Fort Collins, CO 80526 Summary: The site “Century” located within parcel 9726379901 will consist of the construction of a telecommunication facility, consisting of antennas and associated appurtencances on a proposed fifty-five foot stealth bell tower, fenced compound & service equipment for future carriers. This is to be an unmanned facility which will not require any water or sewer facilities, and traffic will consist only of maintenance personnel, who will visit the site approximately twice a month. Refer to Zoning Drawings by TEP for a complete reference. Impervious Documentation: For the consideration of the porosity of the ground areas that are changing, it is recognized that unsurfaced areas are considered 100% pervious, graveled areas are 50% pervious, and concrete or asphalt areas are considered 0% pervious. The following areas can be seen in the Planning Drawings by TEP. • Atlas Tower plans to add a graveled, fenced compound with an area of 1,600ft2 which is considered 50% pervious. • The existing dirt access drive is going to remain undisturbed from it’s original state. The portion residing in the proposed Atlas Tower access easement is 1,606.8ft2 which is considered 100% pervious. • The foundation caissons of the tower are projected to be 37.7ft2 and considered 100% impervious. • The brick wall foundation and remaining fence foundation piles are projected to be 81.4ft2 and considered 100% impervious. Given the areas as described above the total impervious area being added to the property is 859.55ft2 (0.0197 acres). This area is less than the 1,000ft2 benchmark of added imperviousness and therefore can forego storm water detention, water quality and LID requirements. Project Design: The total parcel area is 5.55 acres. The existing impervious area on the property is 0.9962 acres (17.9%). The area that the telecommunication facility is being built on is currently a dirt lot used for temporary parking. The total area that will be disturbed during construction is 1,600 ft2. The total area that Drainage MEMO Century, PDP170017 June 14, 2017 Page 2 of 2 5545 West 56 th Ave, Unit E, Arvada, CO 80002 o) 303.566.9914 www.tepgroup.net will be disturbed will increase the total impervious area of the property by 859.55 ft2 (0.0197 acres)(0.35%). Shrubs will be planted just outside the proposed fence perimeter for visibility improvement. All the remaining area surrounding the compound will remain as dirt shown in the Zoning Drawings by TEP. The existing amount of impervious area and gravel areas will not change by a significant degree that storm water mitigation is recommended as a result of the construction. A silt fence is proposed to surround all disturbed areas to control any potential sediment and runoff from polluting downstream water sources during construction. The runoff from the proposed construction will not negatively affect nearby property owners. Graham M. Andres, P.E.