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Ms. Katie Larsen <br />08/06/2025 <br />Page 6 <br />15. Confirm drainage area delineations match site grading, some areas on the perimeter <br />of the sites do not appear possible to route to proposed stormwater basins as <br />indicated in HydroCAD. <br />(DTE 3/11/2025) The drainage areas have been updated per the comment. <br />(WSB 4/2/2025) The existing modeled drainage area of 4.551 acres exceeds the <br />proposed modeled drainage area of 4.071 acres. These areas must match for proper <br />confirmation of rate control. <br />(DTE 6/19/2025) This will be difficult to accomplish as the marketplace drive right-of- <br />way is included in the existing drainage pattern, but is being altered to be treated by <br />the City’s stormwater management BMP. If the runoff rates from the City’s <br />stormwater management BMP are provided, we could add them to our report to <br />analyze runoff from the overall development. <br />(WSB 8/6/2025) As existing conditions modeling is just a runoff node to a basin, it is <br />recommended to clip out the Marketplace Dr ROW from the existing modeled area. <br />This will allow for an apples-to-apples comparison, even if existing conditions <br />includes runoff from the ROW area. <br /> <br /> <br />16. For modeling of outflow rates and HWLs, exfiltration is not allowed in HydroCAD to <br />conservatively design assuming basin infiltration capacity is lost in the future. <br />(DTE 3/11/2025) Infiltration has been removed from the HydroCAD model per the <br />comment <br />(WSB 4/2/2025) Complete <br />(WSB 8/6/2025) This comment is reopened as both basins are again modeled with <br />exfiltration outlets. <br /> <br />17. (WSB 4/2/2025) It is recommended to consolidate the parking space curb cuts going <br />into IB-1. <br />(DTE 6/19/2025) Noted, these curb cuts have been consolidated. <br />(WSB 8/6/2025) Complete. <br />18. (WSB 4/2/2025) The IB-1 storage curve in the HydroCAD modeling is incorrect for <br />the 906 contour. <br />(DTE 6/19/2025) Noted, the model has been corrected. <br />(WSB 8/6/2025) Complete. <br />19. (WSB 4/2/2025) Some kind of trash screening is needed on the IB-1 outlet opening <br />to reduce the potential for clogging of the 5” orifice. <br />(DTE 6/19/2025) The outlet structure has been replaced with an outlet culvert <br />equipped with a trash guard. <br />(WSB 8/6/2025) Noted. Please remove the OCS detail on sheet C602 to avoid <br />confusion. <br /> <br />20. (WSB 4/2/2025) The EOF for IB-2 must include riprap stabilization. <br />(DTE 6/19/2025) Noted, riprap has been added to the EOF location. <br />(WSB 8/6/2025) Complete. <br />21. (WSB 4/2/2025) Provide the vertical separation of the storm sewer crossing the <br />watermain in Marketplace Dr. <br />a. Maintain minimum 18” separation with watermain <br />b. Insulation is needed for when vertical separation is less than 36” with <br />watermain <br />(DTE 6/19/2025) The storm sewer noted in the comment has been removed. <br />Java Properties - Lino Retail 2.0 Engineering Review <br /> <br />