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HomeMy WebLinkAboutA027 - Council Action Form dated September 26, 2006 ITEM # 30ai DATE 09/26/06 COUNCIL ACTION FORM SUBJECT: FINAL PLAT FOR WAL-MART'S SUBDIVISION, FIRST ADDITION BACKGROUND: The applicant is requesting approval of the Final Plat for Wal-Mart's Subdivision, First Addition. The Final Plat includes approximately 25.34 acres and is generally located at 528 and 534 South Duff Avenue. The Final Plat establishes two lots for commercial development and three lots for street right-of-way. Lot"A" is an extension of Southeast 5th Street to the east line of the proposed subdivision. Lots "B" and "C"dedicate land that becomes part of the right-of-way for South Duff Avenue. The purpose of this Final Plat is to consolidate several parcels of land into one large lot (Lot 1) to enable the construction of a Wal-Mart Super Center. Land in the proposed subdivision is zoned as: "HOC" (Highway-Oriented Commercial). The developer has submitted a Letter of Credit in the amount of$940,500 to coverthe cost of public improvements associated with the subdivision. As a separate but related item to the development of this proposed subdivision, please note the attached letter regarding proposed bioretention facilities from Ross Henson. Mr. Henson is the consultant preparing the platting and site plan documents for the Wal-Mart Supercenter development. This bioretention facility proposal is Wal-Mart's attempt to provide an environmentally sensitive way of managing storm water on the site. Public Works Director John Joiner will be present at the City Council meeting on September 26 to offer comments by City staff regarding this proposal. ALTERNATIVES: 1. The City Council can approve the Final Plat for Wal-Mart's Subdivision, First Addition. 2. The City Council can deny approval of the Final Plat for Wal-Mart's Subdivision, First Addition. 3. The City Council can refer this item back to staff and/or the developer for additional information. MANAGER'S RECOMMENDED ACTION: All subdivision requirements for this approval have been fulfilled. Therefore, it is the recommendation of the City Manager that the City Council approve Alternative# 1.This will approve the Final Plat for Wal-Mart's Subdivision, First Addition. t RAYMOND H.FRANKENBERG B U E S C H E0 IFW�YIKENBERG CIVIL RAYMOND H.FRANKENBERG,II MARK FELDMANN r, CHARLES BRUEGGEMANNy'm, ENVIRONMENTAL JOSE INDUSTRIAL FELDMANN aI INC.MARKFR ERG ASS ROSS HENSON ' MICHAEL MEYER ARCHITECTURAL RICK ROHLFING consultants & engineers LAND SURVEYORS 103A ELM STREET-WASHINGTON MISSOURI 63090-TELEPHONE(636)239-4751 FAX(636)239 1646 September 7, 2006 City of Ames Department of Public Works 515 Clark Avenue Ames, IA 50010 Attn: Mr. John Joiner, Public Works Director RE: Bioretention Basin Wal-Mart Supercenter 4256-00 534 S Duff Avenue Ames IA BFA Project 03-2735 Mr. Joiner, From our previous meetings and discussions, and at the request of the City Council, we have reviewed and evaluated the possibility of an environmental project that could be proposed for the site. We believe that we have identified just such a project - constructing a bioretention area in the location of the original detention basin. As you know, a bioretention facility is a shallow, landscaped depression designed to receive storm water runoff. The facility captures runoff and filters it through a soil medium. Pollutants are removed by a number of processes including adsorption, filtration, volatilization, ion exchange and decomposition. Bioretention is a treatment practice that utilizes the chemical, biological and physical properties of plants, microbes and soils for capturing/reducing storm water runoff and removing pollutants from runoff. There are four performance types of bioretention facilities. A Infiltration/Recharge facility, a Filtration/Partial Recharge facility, a Infiltration/Filtration/Recharge facility, and a Filtration facility only. For this site we would recommend the Filtration/Partial Recharge type of facility. This facility filters runoff and allows a partial recharge of the groundwater. PROFESSIONAL CONSULTANTS The facility we propose would divert all of the Wal-Mart roof water into the bioretention facility. The roof water would be essentially clean runoff. The bioretention basin would benefit the project by: l. providing retention of storm water thus reducing the rate of runoff. 2. improving the quality of storm water runoff thru various treatment processes. 3. providing infiltration and recharge of the ground water with clean water. 4. enhancing the habitat for birds and other animals. 5. providing a buffer between a commercial use and the natural environment. Although the details have not been worked out, I have attached a sketch showing how the bioretention facility could be laid out. The sketch shows small depressions that would accommodate, at a minimum,the first 2" of runoff from the proposed drainage area (roof and basin area approx. 9 acres). Again, this runoff is expected to be clean runoff which would have no pollutants other than that contained in rainfall. The wetted areas shown outside of the floodway area would be constructed above the existing grades thus requiring no "cut" nearest the water supply well. The wetted area within the floodway area would have 1 to 2 feet of existing grade removed to provide the depressions due to no fill being allowed in the floodway. The type of vegetation is still being determined. We anticipate that the vegetation will consist of local plants ranging from wetland plants to upland flowers and grasses. We will also be providing various trees within the basin area. These are also undetermined at this time. Please review the enclosed information so that we can discuss the possibility of constructing this type of environmental improvement at the site. Should you have any questions please do not hesitate to contact me. I look forward to discussing the details on this with you. Thank you. M Ross E. Henson, A.I.A. Buescher Frankenberg Associates, Inc.