Lee's Summit

Easement width for storm line A from A2 to A1 is too narrow - in particular, in the vicinity of A1. The City requires a minimum width of twice the depth of the storm sewer as measured to the flowline, assuming the storm line is centered within the easement. Please evaluate alternatives, including expanding the width of the easement near A1, or geometric changes.

Sheet 221: There is a remnant label "sanitary line AA" which is no longer relevant. Please remove this label.

Easement width appears too narrow between A6A and A4. A minimum width of twice the depth of the storm line is required, assuming the storm line is centered within the easement. Please evaluate and revise as appropriate.

Sheet 211: The sanitary note "Sanitary Line AA" that remains as a remnant should be removed from the plans. Please remove this note.

Off-site easements shall be dedicated by separate document. This includes any off-site drainage easements. Please see previous applicant letter for details. This shall be required prior to formal approval of the plans.

Results of the wetland investigation and USACE jurisdictional determination shall be submitted to the City prior to formal approval of the plans.

The underdrain detail does not appear correct for this application. Normal application of the underdrains in the City of Lee's Summit is to connect the two (2) curb inlets at the low point to each other. It appears the detail provided is for an edge drain? Please evaluate and revise as appropriate.

A revised cost estimate should be submitted prior to formal approval of the plans. This would include the new RCP, or any other changes made to the plans since the last cost estimate from May 2022. Please revise as appropriate.

Sheet 131: The turning spaces on all ADA-accessible ramps appear to be designed with slopes higher than 1.50% in the diagonal direction. Please see previous comment letter concerning this issue. The design slope in any direction, including the diagonal, shall be equal to or less than 1.50% in any direction. Please revise as appropriate.

Sheet 131: Many of the ADA-accessible ramps are called-out with slopes greater than 7.50%. Please refer to previous comment letter concerning this issue. The City has adopted more stringent standards for the design slope, and 7.50% is the maximum longitudinal slope. Please revise as appropriate for all applicable ramps.

Sheet 131: A 1.58% callout is provided on the ADA-accessible route across the intersection at Hagan and Maguire. As discussed in previous comment letter, the maximum cross-slope within an ADA-accessible route is 1.50% in the City of Lee's Summit. Please revise as appropriate.

Please refer to comment #10 in the previous applicant letter. An additional curb inlet is warranted near sta 1+80 on Maguire (north side) due to City requirements of 400 foot maximum spacing. This is required regardless of gutter spread calculations. Please revise as appropriate.

Sheet 222: The hydraulic grade lines are not defined on "ST A Profile" as requested in previous comment letter. The leader lines are not pointing to any hydraulic grade lines on the profile view. Please reconcile.

Please refer to comment #14 in previous applicant letter. The underdrain detail shall be shown. As presented, all options were shown, and only one (1) method pertains to this particular installation. Please cross-out the other methods of installing underdrains, as the City will be expecting the first method to be used. Alternatively, you can only show the first method and not show the other methods. Pleaser review and revise as appropriate.

Please refer to previous comment #12. CPP is not the same as HDPE. If you desire additional clarification, please refer to the City of Lee's Summit Design and Construction Manual "Specifications" section. Please reconcile, and please consider RCP as a substitute rather than CPP for these street crossings beneath Maguire.

Please refer to comment #13 within the previous applicant letter. No such anchor is shown on the 60 inch storm line entering the basin at a shallow depth, despite the response to comments stating otherwise. Please revise, and show specific details within the plans showing how the anchor will be constructed.

A SWPPP shall be required prior to formal approval of the plans, as well as formal definition of wetlands identified by your investigation. Your response to comments stated that wetlands exist, but you are disputing this delineation. Please keep us updated on the findings of this investigation, as this shall be needed prior to approval of any plans.

A separate off-site drainage easement shall be required prior to formal approval of the plans. This off-site drainage easement shall encompass the area to the south of Maguire Blvd., up to and including the flared end section and sufficiently wide around the flared end section and associated pipe to allow for future maintenance. The off-site easement shall be public, and shall follow the standard template provided by the City of Lee's Summit, and shall be reviewed prior to execution and recording. Please provide this off-site drainage easement on forms provided by the City for "Public Drainage Easement".

An additional ADA-accessible ramp appears warranted at Maguire and Cargo. This ramp would cross Maguire, but since it is not in a stop-controlled situation, is not subject to the 1.5% cross-slope across the ramp, but rather, 5% max. Please add details showing the additional ramp, and please show the general location on the "overall site plan" sheet.

iSheet C-130: Portions of the ADA-accessible ramps are shown with a designation of "L" for a landing. These are not landings, but rather, turning spaces. In one instance at north side of Maguire and Hagan, this turning space (incorrectly designated as a landing) is called out with 1.5% in all directions, which mathematically equates to a slope greater than 2.0% in the diagonal direction. All turning spaces must be flat, as defined as being no greater than 1.5% in any direction including the diagonal. Please review and revise as approprieate.

Sheet C-130: Wings are shown on the ramps, and not desired by the City. Please remove the wings, and substitute grading at no greater than 3 to 1 slope to the ADA-accessible ramp.

Sheet C-130: ADA-accessible route across the stop controlled intersections were missing from this sheet. The route shall be clearly shown on the plans, with 5 foot minimum callouts for width, and maximum 1.5% cross-slope across the entire route.

Sheet C-130: The diagonal slope across the turning space (incorrectly labeled as a landing) on the east side of Cargo and Maguire is greater than 1.5%. I am showing approximately 2.1% slope across the diagnonal based on elevation callouts on the diagonal. Please review and revise as appropriate.

Sheet C-130: The turning space (incorrectly labeled as a landing) shows a slope of greater than 1.5% on the diagonal on the south side of the intersection of Maguire and Hagan. I am showing a slope of 2.1% at this location. Please review and revise as appropriate.

Profile views of streets should be updated to reflect the ADA-accessible route across the intersection at stop controlled intersections. As shown, it appears a 2% callout is provided on the profile views, which may present an issue when compared to Sheet C-130 which shall be revised to show no more than 1.5% cross slope across the stop controlled intersections. Please review and revise as appropriate.

Sheet C-211: Future sanitary sewer extension in phase 2 is being proposed within easements on adjacent property to the west of Lot 1. An exclusive easement should be dedicated for this future sanitary sewer on Lot 1 rather than utilizing the adjacent property easement to the west. Please review and revise as appropriate, noting that distance requirements are met betwen the sanitary sewer and the storm line, as well as depth of sewer versus width of easement for the exclusive sanitary sewer easement. This shall also be reflected on the final plat. Please contact this office for language for the exclusive sanitary sewer easement.

Sheet C-211: The same issue with the sanitary sewer exists to the west of Lot 3. An exclusive easement for sanitary sewer is required rather than a general utility easement since this line is being constructed behind lots and out of the right of way. Please review and revise as appropriate, and ensure proper clearances and sufficient easement width of twice the depth is provided for the santiary sewer easement, assuming the line is centered within the easement. Ensure this comment is carried forward to the final plat.

An additional curb inlet appears warranted on Maguire, to the north of the westernmost proposed curb inlet on Maguire. The maximum distance between curb inlets is 400 feet, and as proposed, it appears the curb inlet at the sump location may overload without an additinal at-grade curb inlet to the north of the proposed curb inlet. Please revise as appropriate.

Normal procedure within the City of Lee's Summit is to show the HGL below the crown of the pipe, and the 100 year HGL at least 6 inches below the throat of any opening. As proposed, the 10 year event is above the crown of the pipe in many instances, and it would appear the 100 year event will surcharge out of the inlet. If this design is sought, emergency overflow swales for the 100 year event shall be required. Recommend sizing the pipe as described above (i.e., with the 100 year event no less than 6 inches from any throat opening). Please review and revise as appropriate.

Storm lines that cross Maguire shall be either RCP or CPP. HDPE is not allowed in this instance due to the street classification. Please revise as appropriate.

The last section of pipe entering the detention basin is shown as HDPE with a diameter of 60 inches. This will tend to float if constructed as shown without anchors. Recommend RCP from the last structure to the detention basin. If not, other designs are required to address the issue of floating.

Underdrain was missing at the sump location of the two curb inlets along Maguire. These shall be called out on the plan view, and sufficient notes directing the reader to a standard detail to be provided elsewhere within the plan set. Please show which KCAPWA detail is being used (i.e., the cross-pipe detail should be shown, you can cross-out the other details if that is easier). Please revise as appropriate. In general, you will be connecting the two curb inlets with a perforated pipe to facilitate groundwater drainage at the sump location.

It was our understanding the ditch to the west of Lot 1 would be filled-in after installation of the storm line entering the detention basin. This will also be required after re-routing the sanitary sewer line to the east onto Lot 1 (see previous comments related to this issue). As shown, the ditch will remain, and erosion issues will continue to affect the integrity of the detention basin at its inlet. Please review and revise as appropriate.

In regard to the above comment, it is acceptable to provide a gentle swale rather than completely filling the ditch to the west of Lot 1. However, some method of addressing the ongoing issues at the discharge point into the detention basin shall be considered. There is excessive erosion occurring at this location, and it is recommended the swale be directed to a small private underground drainage system which then conveys the stormwater to the detention basin bottom, rather than allowing it to create rills along the basin side. Please review and revise as appropriate.

A SWPPP is required prior to formal approval of the plans.

Are there any wetlands on the site?

Sheet C-120: Street name signs shall be a mix of upper and lower-case letters. Re. City Sign detail.

The temporary cul-de-sac at the end of Maguire shall be completely removed with the road extension.