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RC Townhomes-CS040429DEVELOPMENT REVIEW COMMITTEE ENGINEERING COMMENTS ITEM: PD-201-TH-2~ Riverchase Townhomes~ Lots 1-52~ zoning change request from LI (Light Industrial) to PD-201-TH-2 (Planned Development-201, Townhouse-2) to allow the construction of 52 single-family attached homes on 4.42 acres of property located along the east side of MacArthur Boulevard, approximately 1,400 feet north of Riverchase Drive, at the request of Jason Rose, Architect STAFF REP.: Gary Sieb PROJECT ID//PD-04-0013 DRC DA TE: April 29, 2004 and May 6,2004 CONTACT: Kenneth M. Griffin, P.E., Dir. of Engineering/Public Works 972/304-3686 COMMENTSTATUS: ~/PRELIMINARY ,nrA, ~,/~c~n ?~FTER P&Z Site Plan - 1. The proposed Haas Court needs to line up with the existing Bethel School Road. 2. Indicate whether you are proposing this street to be publicly dedicated or privately owned and maintained. 3. You are showing a 50' ROW dedication and then you are calling a 27' wide fire lane, there seems to be some conflict there see #2 above. 4. You need to dimension the fire lanes shown mid-block between Lots 14 & 15 on the NW side and Lots 38 &39 from the centerline of the proposed street. Also, provide some kind of information on how you will prohibit parking in that area. 5. In addition, the typical courtyard parking scheme indicates two parking places (e.g. Lot 37 and Lot 38) that are actually on Lot 38 whereas the garage for Lot 37 is accessed through that area on Lot 38. How will you ensure access to garage for owners of Lot 37? If the owners of Lot 38 prefer to park on the paved portion of that lot, I don't see how you can prevent them from doing that. 6. If this is to be a public street, it will be required to end in a cul-de-sac rather than the configuration shown. Other access would need to be provided into and out of this development (see Fire Marshal's comments for further requirements). The cul-de-sac length exceeds the maximum allowed by our subdivision ordinance. Landscape Plan - 1. This plan indicates that several trees will be planted on top of our 24" waterline. not be allowed. · See additional comments on Preliminary Plat case for this development. That will DEVELOPMENT REVIEW COMMITTEE ENGINEERING COMMENTS ITEM: Riverchase Townhomes Addition~ Lots 1-52~ Preliminary Plat to allow the construction of 52 single-family attached homes on 4.42 acres of property located along the east side of MacArthur Boulevard, approximately 1,400 feet north of Riverchase Drive, at the request of Jason Rose, Architect STAFF REP.: Gary Sieb PROJECT ID# PP-04-0014 DRC DA TE: April 29, 2004 and May 6,2004 CONTACT: Kenneth M. Grif~n, P.E., Dir. of Engineering/Public Works 972/304-3686 COMMENTSTATUS: ~/PRELIMINARY ~r~r~t ~ ,~.~ ~.. D~ZZC~r~ ~..~- 1. Align proposed Haas Court with existing Bethel School Road, which will be signalized within a short time. Those txvo streets must align in order for that planned signalization to work. 2. Construct a left turn lane for southbound traffic on MacArthur Blvd. to access Haas Ct. 3. The 10' drainage and utility easement shown must be a minimum 20' wide. Please provide that width where a drainage easement is required. 4. Cul-de-sac length exceeds maximum allowed by Subdivision Ordinance. 5. Is this to be a publicly dedicated street? 6. A significant amount of your proposed parking area is shown within the public right-of-way and on Lot 25. Two comments: a) Sidewalks should be shown in the entire development, and specifically around the parking area b) A cul-de-sac should be shown. c) Make sure Lot 25 parking area is in an HOA easement rather than on private property. Drainage Area Map - 1. You show a large area of the City Park and ballfields to the NW of this property draining through this development. Indicate how that drainage will be picked up and conveyed through the site to an appropriate outfall. 2. The 5' inlet shown within the curb return at the end of Haas Ct. should be relocated to an appropriate location outside the curb return. 3. The developer will need to provide an easement document giving authorization to construct the headwall structures and direct drainage onto the adjacent private property. 4. Show topography in the existing channel that is shown with a headwall structure and grading down to the channel to ensure that this design will work. Preliminary Water & Sewer Line - 1. Verify that the 24" and 12" lines are shown properly; make sure you are tying into the 12" line, not the 24" line. 2. For the connection of the sanitary sewer to the existing stub out: verify that the stub out is really there, and that the elevation works for your proposed sewer line. You are proposing a 6" sanitary sewer line and our minimum standard is an 8" line. Each individual property should have a separate water and sewer tap. Remove the General Note that "water service is 3/4" with bullhead connections." Sewer services are 4" but our minimum water tap size is 1". We can alIow a Y4" meter but the tap is a 1" minimum. Valve spacing needs to be no greater than 500' per the Subdivision Ordinance. At the end of this water line you show it to go from 8" to 6" however our minimum line size is 8". This is a 900' dead end waterline. I suggest you tie into the 8" waterline in Bradford Drive which is northeast of your project and would require some additional offsite construction. The City owns a portion of the adjacent property and would entertain the option of an easement for waterline construction. Also adjacent is the TXU easement where you may be able to locate an offsite waterline.