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October 23, 1997 Mr. Steve Ach Page Two • It is unclear how the rear yards of Lots 1 -4, Block 5, will drain. This entire area appears to be treed and relatively flat. Some type of positive drainage has to be provided in this area. • The rear yards of Lot 8, 9, and 10, Block 3, have a relatively steep side slope shown. It appears that this side slope is almost 1:1. No grade greater than 3:1 should be allowed in this area. • The rear yard drainage across Lots 6 and 7, Block 1 appears to flow through the middle of the rear yards and not along the drainage and utility easements, provided at the perimeter of the lot. If this is to continue, additional easement will be needed on these lots. It would be advisable to actually move the drainage to the rear lot drainage and utility easement. In cases where this drainage easement is provided, across the middle of the back yard, there could be problems with variances or easement vacations required if the homeowner wants to put on a deck or expand the home. • Where the storm drainage pipe from the southerly pond flows across to the northerly pond between Lot 1, Block 4 and between Lots 20 and 21, Block 5, the emergency overflow elevation should be noted. • The northerly pond shows a high water elevation of 878.9. This would provide for flooding of the rear yards of Lots 15 — 20, Block 5. Additional easement should be provided for this area as it would be inundated in the 100-year flood. • Detailed drainage calculations have been provided. However, we have not had sufficient time to adequately review them for this memo. I hope to have them reviewed prior to the Planning Commission meeting. • The grading plan shows a temporary cul-de-sac at the east end of SIreet C located partially in the park area. However, the grading plan does not indicate any grading for this cul-de-sac. The grading plan should be revised tc sndicate the grading necessary for this temporary turn around. • The grading plan indicates drainage from Block 1 flows across the park through a swale, out to Street C. This does not appear to provide for a very usab e park area with the drainage swale that is provided. Some other means of providing for the drainage should be considered which would allow the park area to be relatively flat for park uses. C. Preliminary Utility Plan • This plat will receive sanitary sewer and water service from the utilities that were jacked under TH 10, along the east line of the Sherbume County Government Center property, with the Western Area Phase 2 improvements. Essentially, water service will be provided through a long dead-end relying on the crossing • under TH 10. An analysis of the water pressure and fire-fighting capability indicates that it is not necessary to loop the water system on the north side of TH 10 for service to this development. -lowarc R. Green Company CONSULTING ENGINEERS O:\PRO.11801610j 1610-230b.oct.do c SO/20'd SP:T T LEE T-t7Z-± O