Lee's Summit

Sheet 01: Revise the water contact to Water Utilities department, at 816-969-1900.

Sheet 02: • Label the perforated underdrain on this sheet. • Please include outlet protection for the basin outlet and temporary pipe. Provide calculations to show the design is adequate for the expected discharge. Be sure to dimension it on the plans for constructability. • Does a swale section need provided for the areas upstream and downstream of the temporary pipe? Please review and include if deemed necessary.

Sheet 04: • Is the drawing labeled “Pond Outlet C1” supposed to be Section B-B of the Special Inlet Structure Detail? • Revise the Special Inlet Structure Note 2 concrete reference to KCMMB concrete.

Sheet 05: • Where is the TCE located for this project? Please denote access. • Is the intent to construct this as a sediment basin which will be converted to a detention basin in the future? That doesn’t seem to make sense given that the construction area is downstream. If not intended as a sediment basin, please revise the Erosion Control Phasing Chart accordingly. • Please include the type of biodegradable turf reinforcement mat in the plan set. • Silt Fence is not an appropriate BMP for outlet structures. Please revise.

Please include a full detail for construction of the Outlet Structure in the plan set.

Please submit an Engineer's Estimate of Probable Construction Costs.

These comments are for the following: o PL2020269 Aria OffSite Detention – Comments 2-5 o PL2020250 Aria FDP – Comments 6-31 o The Stormwater Report (Same report submitted for both projects) – Comment 32 Due to the nature of these comments, additional comments may be forthcoming and both projects will require a 10-day review period.

Please add a sheet to the Detention Basin plan set clearly indicating the various drainage areas shown in the plans.

Where is the underdrain located in the detention basin? How is it to be constructed? Are there special grading requirements in the basin?

Is the basin to be seeded on the bottom?

What lifespan Biodegradable Turf Mat is required?

Include spot grades as needed to ensure the future building pad sites will not pond water.

Storm sewers are to be designed to keep the design HGL within the storm sewer system. Please revise as needed.

Junction Box, Area Inlet and Field Inlet designations are all used in the storm sewer plans. It appears that field inlets have openings and area inlets do not, and area inlets seem to be in paved areas. Are the area inlets actually junction boxes? Please clarify.

When identifying the number of openings in a Field Inlet, please also indicate which sides those openings are on.

Please verify that there are standard details for every type of structure used, even the various Nyloplast structures.

Include lid types of Nyloplast structures in the Structure Tables.

Please review and verify that where the domestic and fire water lines are shown crossing the storm sewer, pipe graphics and inverts for both lines are shown in the storm profiles.

Structures greater than 7’ deep require a special design. Please add to the plan set.

Are the drainage easements shown at the end sections public or private? Please clarify with a note.

Please review and verify that compacted fill hatching is shown all the way downstream to end sections in Profile views where needed.

Sheet C505 Profile: Please add the 15” Inv. In at Str. 1-1.

Sheet C511 Profile: Please extend the compacted fill hatching to Str. 9-1 and upstream to Str. 9-9.

Sheet C512 Profile: Move the SW Inv. Out (15” HDPE) label to the downstream side of the structure.

Sheet C513 Profile: Remove the labels for a water line crossing that isn’t there upstream of Str. 10-10.

Sheet C514: Please verify the size (15” vs 18”) of Str. 12-5.

Sheet C515 Line 14 Plan: Please label the retaining wall.

Sheet C515 Line 14 Profile: • Please include the sanitary sewer crossing. • Please revise the Proposed Ground line to terminate at the Existing Ground line.

Sheet C516 Plan: There appear to be 2 lines connecting to Line 15 with tees downstream of Str. 15-6. Please verify.

Sheet C516 Profile: • Please add the 15” Inv. In at Str. 15-1. • Please darken the Proposed Ground label. • Please verify the proposed ground profile between Str. 15-4 & 15-4.

Sheet C518 Profile: Remove the labels for a 6” water line crossing that isn’t there upstream of Str. 15-3.

Sheet C519 Profile: Complete the water line crossing information just downstream of Str. 19-1.

Sheet C526 Profile: • Please include the sanitary crossing. • Relocate overlapping text for clarity.

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Sheet C528 Profile: • Please include the sanitary crossing. • The size of ES-01 appears incorrect in the Structure Table. Please revise.

Sheet C529 Profile: Please include the sanitary crossings upstream and downstream of Str. YD-P1.

Sheet C531 Profile: Please label Str. YD-S2.

Please address the following comments in the submitted Stormwater Report: • Please provide design input and calculations and for the proposed infiltration basins. • Please provide additional information on the proposed use of Snouts. How are they accounted for in runoff modeling? What design parameters are appropriate for them, and are installation requirements provided? • Is the difference between the “Peak Q In” for the detention basin between the Aria micro and Overall macro scenarios due to the additional development in the macro scenario directing additional drainage to the basin? • Design and Construction Manual Design Modifications Requests, or “waivers”, are required for several items. When submitting, please be sure to include a complete narrative why the waiver is being requested and provide justification for approval. Waivers are required for the following: o Not providing 40-hour extended detention for the Water Quality event as required by the City. o Exceeding the allowed release rate.