Agenda - Council - 03/13/2007 - Laserfiche WebLink

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Preliminary Plat: Pine Prairie January 26, 2007 Revised March 8, 2007 Page 2 of6 Grading and Drainage: A grading and drainage plan has been prepared by Mr. Tim Eggerich PE. which proposes conveying runoff to a detention pond to be located in the northwestern comer of the plat. Once this pond is full, additional runoff is discharged through a storm pipe into the storm sewer system located in 14Sth Avenue to the south. It will be necessary to construct approximately 120 feet of 15 inch storm sewer through Lot 21, Block 5 of The Ponds subdivision to accomplish this discharge outlet. TIns lot is the common lot shared by the townhouse units located within the Ponds subdivision and is encumbered with a drainage and utility easement. This drainage and grading plan is generally acceptable. Staff offers the following comments: . Contours should be added such that they extend a distanc~ of lOO feet beyond the plat boundaries. This will enable staff to better review the impacts the development on surrounding properties. . Silt fence should be placed around the entire site. A segment approximately 200 feet long is missing along the western boundary of the plat. Silt fence should also be placed in front of the tree save fence proposed on the south boundary of the site. . Drainage from units 1 through 3 drains onto the adjacent property to the south and then westward. A catch basin may be considered to intercept this storm water prior to flowing onto the single family lot to the south. . The inlet to the detention pond should be relocated from the southeast to the northeast comer of the pond to minimi7:e short circuiting. . Calculations should be submitted to demonstrate that the peak discharge period from this system does not occur simultaneously with the peak discharge periods for The Ponds storm water system. . The developer should consult with The Ponds townhome association and include a schedule for the work and restoration to be performed on their property in the Special Conditions of the contract documents. . The drainage swale along the rear of Lots 4 through 9 is proposed at a grade flatter than 2%. A certificate of grading will be required prior to occupancy to ensure that a minimum grade of 1 % has been achieved. . A permit needs to be obtained from the Lower Rum River Water Management Organization. Utilities: This plat will be served by municipal sanitary sewer and water. The plan proposes the installation of public sewer and water mains under Helium Street. This will remove future maintenance activities out of the County right of way. An additional hydrant should be placed near the south end of the plat to meet hydrant spacing guidelines. Fire Department Considerations: The submitted plans will not require sprinkling due to the size to the proposed buildings. The Fire Department reserves the right to require fire lanes, where deemed appropriate on narrow public or private streets. It is not anticipated that fire lanes will be required on Helium Street. -139-