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� <br />� <br />I L""' <br />r+j � ��M1 ' <br />s� j !� � ,�.�,, : �� <br />��fi..,� <br />August 24,2007 <br />Gary Boryczka <br />2250 Acorn Road <br />Roseville, MN 55113 <br />Re: Biofiltration Trench <br />Oak Acres Subdivision <br />Roseville, Minnesota <br />Dear Mr. Boryczka: <br />.���� <br />�:�—�t�� ��'.�,.�.v .�� <br />Thatcher Engineering, Inc. � <br />3055 Old Highway 8, Suite 103 <br />Minneapolis, MN 55418 <br />p612781 2188 FGi2781 2241 <br />ww w.t�atcher-eng.cam <br />��nai�ed to: �arv(iil,borvczka.com <br />In accordance with your request, Thatcher Engineering Inc. ("TET") reviewed the proposed <br />BiofiltrationTrench Plan ("Plan") to determine compliance with Roseville City Code <br />requirements and Minnesota Pollution Control Agency Best Management Practices. <br />TEI understands that Art Mueller seeks approval of the Final Plat and Public Improvement <br />Contract for Oak Acres, a residential subdivision that redevelops 2201 Acorn Road into a 41ot <br />single-family residential development which includes the construction of two Biofiltration <br />Trenches. We also understand that the Biofiltration facility will be owned, operated, maintained <br />and cleaned by the City. We also understand that the facility will be located on private property <br />within a City easement. <br />We reviewed the City Code and have the following observations: <br />1. The Code requires that all improvements shall be in accordance with applicable City <br />standards (Subdivision Regulations Section 1102.07.B.). However, the Code does not <br />have specific standards for Biofiltration. <br />2. The Code requires that each lot created through subdivision shall be suitable for the <br />proposed use as defined by a suitability analysis. Suitability analysis shall consider soil <br />limitations, and sufficient information shall be submitted by the applicant for the <br />community to make a determination of land suitability. The information shall include at <br />least adequate soil information to determine suitability for public utilities from field <br />investigations such as borings or other methods (Shoreland, Wetland and Storm Water <br />Mana�ement Section 1016.23). The BiofiltrationTrenches included in the Plan are <br />pt�Ti�]t� ttt.ilili�� since they are � vital part of stormwater management and will be owned, <br />operated, and maintained by the City. Thus the soil information required by this section <br />must be supplied by the applicant. <br />Since the City has no specific standards for evaluating the design of Biofiltration trenches, we <br />look to other recognized standards. The MinnesotaPollution Control Agency (MPCA) has <br />published Best �•�tnr��m�i� Practices (�3MP) for Bioretention as a part �f its Starmwat�r <br />Manual dated September 2006, which it reco�nmends that local governments follow. Most <br />'I';IProjectslGary BorycZJcalltr to Gary $-27-07.doc <br />Engineering and Environmental Solutions <br />