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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2006 PAVEMENT MANAGEMENT PROGRAM The overall drainage area and flow pattems for the Neighborhood are illustrated in Exhibit AS. Exhibit A6 illustrates the proposed Storm Sewer Improvements. The Ridgewood Road storm sewer system will include a flared end section constlUcted at Ridgewood Road and Lake Johanna Boulevard to collect approximately 0.8 acres of runoff that is flowing in the ditch from the north. This runoff will be included in the overall neighborhood water quality treatment in the proposed wetland pond. The proposed improvements include collection and treatment of the roadway and adjacent propelty runoff in the neighborhood with the exception of the southern pOltion of Skiles Lane and the nOlthern pOltion of Siems Court that will be treated through future projects. The pOltion of Ridgewood Road that is adjacent to the wetland will collect runoff from the neighborhood to the west and discharge into an infiltration basin along the wetland. The infiltration basin will overflow into the wetland. The nOlth end of Siems COUlt will have a storm sewer constructed that will discharge into the existing ditch and low at'ea along the south side of Lake Johanna Blvd. Directing storm sewer from the nOlthern pOltion of Siems Court to Arden Place would require excavation depth of over 20 feet that is not possible gi ven the confines of this palt of the neighborhood. The low area at Johanna Boulevard and Siems COUlt and has been identified as a potential future ponding area. Based upon a meeting with a representative of the property owner and Rice Creek Watershed officials as well as previous conversations with the property owner (1600 Lake Johanna Boulevard), there is a strong interest in developing the site to include regional storm water treatment facility along with one or two housing units. Storm sewer will be constructed along the southem pOltion of Siems COUlt and connect with the proposed Arden Place storIll sewer system. Additionally, a catch basin at the southern end of the cul-de-sac will be connected to the existing private area drain in the backyard of 1553 Arden Place. The existing PVC storm pipe to Lake Johanna will be abandoned south of Arden Place. The City is inquiring into the existcnce of a drainage easement for this segment of storm sewer. [I' one doesn't exist, a drainage easement should be obtained as a part of this project. This option will improve water quality and significantly reduce ongoing maintenance costs due to erosion along the slope south of Ridgewood Court cul-de-sac. Residents on adjacent property have expressed interest in eliminating the overland flow and constructing a catch basin and pipe instead. 'I l Poor drainage along roadway (Siems Court) The drainage area along the northern portion of Skiles Lane will flow nOlth towards Arden Place where it will enter the storm sewer along Arden Place. During smaller storm events, the runoff will enter a curb cut prior to the catchbasin at Skiles Lane and Arden Place and flow into an infiltration basin. URS 12