Lee's Summit

Please refer to comment #6 of the applicant letter dated Dec. 26, 2018. Although one of the manholes was eliminated, a wider easement is required. It appears an additional 12 feet would be sufficient, and would not encroach over the building line. Please revise on the plans, and ensure this is updated on the plat.

Please refer to comment #9 of the applicant letter dated Dec. 26, 2018. It appears the existing City manhole 28-103 is within the limits of the 100 year water surface elevation. Does this manhole currently have a watertight frame and lid with bolt-down assembly? Does this need to be specified as a retrofit?

Please refer to comment #14 of the applicant letter dated Dec. 26, 2018. In addition to length and diameter of the casing pipe, the wall thickness must be specified. For this particular casing pipe size, the minimum wall thickness is 3/16" (0.188 inches).

Water Utilities will not allow a public extension to the north "Village Care Center" shown on the plans. This should be shown as a private sanitary sewer lateral, with appropriate clean-outs and a wye connection to the public main along Ashurst Dr. A profile view should be provided for this long private lateral, as well as a plan view.

Sheet C201: Please change the Utility Service Numbers as follows: remove the Public Works contact, and insert in its place "Development Services 816-969-1200".

Sheet C202: Plumbing notes should eliminate the comment concerning tees. The City of Lee's Summit requires a wye. Tees are not acceptable.

General Layout Plan: Is it possible to provide a general layout sheet with the entire sanitary sewer line on one sheet, followed by subsequent general layout sheets? This will greatly enhance the plans.

Sheet C203: The sanitary sewer alignment from manhole 1-6 to manhole 1-2 does not follow what was shown in the Preliminary Development Plan. The issue is that the sanitary sewer is now located partially along rear yards, which is not allowed by the Design and Construction Manual.

Sheet C2303: We are assuming the future sanitary sewer line to serve lots 198 and 184 are to be installed along a separate route, and not connected to any of the sanitary sewer within the 1st Plat? If not, the extension will need to occur during the 1st phase.

Sheet C.203: It would appear a manhole could be eliminated between mh #8-3 and #8-5.

Sheet C.204: Laterals are shown connecting to the main in the middle of the cul-de-sac on Grady Ct. and Joshua Dr. Please move the location of these wyes so they are either at the back of curb, or completely outside the limits of the pavement. The issue is future maintenance. Homeowners would incur excessive costs for maintenance of these laterals, due to the pavement repair requirements.

Sheet C.206: The same comment above applies to the wye connections within Kaylea Ct.

Sheet C.206: Please show the horizontal limits of the permenant pool in the pond, as well as the 100 year water surface elevation within the pond in graphic form (i.e, horizontal extent) and an elevation call-out. This may have a bearing on the design of the manholes.

Sheet C.207: Stream crossings also require ductile iron pipe in addition to concrete encasement. The ductile iron pipe should extend from manhole to manhole. Concrete encasement should be shown bank to bank. Be aware of the comments related to the discharge point for the detention basin. The City feels this discharge point has not been adequately designed for energy dissipation, and any additional design in this area will impact the sanitary sewer in terms of depth. Sufficient depth of cover is required for any change to the energy dissipation measures instituted for the detention basin.

Sheet C207: Is there an additional stream crossing between mh #1-5 and 1-6? If so, ductile iron pipe and encasement is required.

Sheet C208: Please call-out the minimum 18 inch vertical spacing at station 28+50.

Sheet C212: The sanitary sewer is too deep at station 12+25. The maximum depth of cover over the top of the pipe is 15 feet.

Sheet C213: No standard detail is referenced for the stainless steel casing. In addition, the standard detail contained in the Design and Construction Manual has specific requirements concerning material call-outs on the plans. Please include the standard detail for casing carrier pipe, and ensure that all information listed on the standard detail as to be placed on the plan view or profile view is included on the plan or profile view. Merely calling out "steel casing" is not sufficient.

Sheet C218: It appears the downstream pipe capacity has been exceeded for a few segments. This would appear to include the segments in the lower reaches of the project. What are the hydraulic grade lines associated with these exceedences? It is our assumption the hydraulic grade line will be above the crown of the pipe, but by how much?

Sheet C218: Please indicate the event on the sanitary sewer calculation table. We are assuming this is the 50 year event, in accordance with the Design and Construction Manual.

Are there any shallow manholes utilized on this project? If so, please provide a standard detail for the shallow manhole.

Please provide the standard detail for stainless steel casing carrier pipe.

Please provide the standard detail for concrete encasement.

Please show the 100 year water surface elevaton within all detention basin tracts. This may have a bearing on the design of the manholes. In general, manholes should include watertight, neoprene-gasketed lids with bolt-down assemblies if subject to the 100 year event.