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Ms. Katie Larsen <br />04/10/2024 <br />Page 2 <br />Lino Lake Tech Center Engineering Review <br />(Amcon 11/13/2023) Understood, Civil drawings will be provided for the full Site & <br />Building Plan Submittal after this Concept Submittal approval. <br />(WSB 11/29/2023) To be reviewed at the time of full submittal <br />(WSB 3/6/2024) Submitted <br /> <br />2. The applicant shall note that site grading work shall be done in accordance with the <br />approved MPCA Response Action Plan (RAP) and Contingency Construction Plan <br />(CCP). Provide updated documentation regarding the current state of the RAP. <br />(Amcon 11/13/2023) A copy of the RAP & CCP document, dated Aug. 27, 2018 is <br />included for your review. The owner did have the site cleaned up, please refer to City <br />of Lino Lakes Permit #2021-02485. Junk & debris that had been dumped on the site <br />was removed & existing concrete debris was properly recycled. <br />Amcon (2/6/2024) We have engaged Braun Intertec to perform a Soil Vapor <br />Investigation. We are requesting that the Planning Commission & City Council have <br />this as a condition of approval. See attached EXHIBIT #3 to review Braun Intertec’s <br />proposal and timing to perform this work. <br />(WSB 3/6/2024) the RAP & CCP MPCA approvals should be provided to the City <br />prior to City Council approval. <br />(Elan 3/26/2024) A note has been added to C-201. The status of the cleanup will be <br />provided by Braun. <br />(WSB 4/5/2024) Complete <br /> <br />3. (WSB 3/6/2024) Applicant to revise slopes on BMP to a maximum of 3:1. <br />(Elan 3/26/2024) The slopes shown at 2:1 are in areas that will not be mowed. A 2:1 <br />slope is stable. It is not possible to flatten these slopes to 3:1 and maintain sufficient <br />pond volume. <br />(WSB 4/5/2024) Per City design standards, slopes are to be a maximum 3:1 ratio. <br />This is consistent with MN Stormwater Manual and Nationwide Urban Runoff <br />Program (NURP) design standards. <br /> <br />4. (WSB 3/6/2024) Applicant to call out EOFs of all low points to ensure appropriate <br />freeboard is provided to proposed and existing structures. <br />a. Minimal freeboard (1') between FFE (903.50) and EOF (902.5) for the catch <br />basin on the east side of the building. <br />i. Care will need to be taken that this area is not blocked with snow <br />(shown as snow storage) during thawing/ periods of heavier rain. <br />(Elan 3/26/2024) The grades have been adjusted to provide an overflow to the south <br />at elevation 902.5. Snow storage should occur behind the curb. The D412 curb and <br />lack of landscape materials is intended to make it easier to push the snow into the <br />area adjacent to the berm. <br />(WSB 4/5/2024) Complete - Caution will need to be taken care of to keep the EOF <br />route clear of snow in case the catch basin backs up and water levels could get over <br />904 <br /> <br />5. (WSB 3/6/2024) Correct the direction of the flow arrows shown on the storm sewer <br />pipes. <br />(Elan 3/26/2024) The line type (direction of flow) has been corrected. <br />(WSB 4/5/2024) Complete <br /> <br />6. (WSB 3/6/2024) Verify the amount of drainage being contributed from the existing <br />storage area to the north of the site. <br />(Elan 3/26/2024) See stormwater narrative for existing drainage map based on <br />current survey. <br />115