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Li viIr-J a it G R O U P 2.0 Summary Analysis / Narrative: 2.1 Introduction: This stormwater management report accompanies the Civil Engineering Plans prepared by Civil Site Group for the subject project dated 03/23/2026 and serves as attachment D to the storm water pollution prevention plan (SWPPP). This report includes a summary of the existing and proposed site conditions, the stormwater requirements of relevant regulatory agencies, and proposed design calculations and data to meet the requirements. 2.2 Existing Site Conditions: Site Description: The existing site is currently a church site with a wooded area and a wetland. The existing site surface coverage areas are shown in the table below: Drainage Area Impervious Area Pervious Area Total Area Area[SF] CN Value Area[SF] CN Value Area [SF] CN Value EX1 (TO EX WETLAND) 5979 98 147145 80 153124 81 EX2(TO LONG LAKE RD) 0 98 4047 80 4047 80 EX3(TO EAST) 0 98 302 80 302 80 EX4(OFF-SITE TO EX.WETLAND) 42,086 98 13701 80 55787 94 Existing Soils: A geotechnical evaluation has been completed for the project by Kilo Engineering on 12/30/2025. The report notes that due to the density of trees, they were not able to get boring equipment into the site, thus hand auger holes were used to analyze the soils. The auger depths went to a maximum of 5 ft below existing grade. Within that 5 ft, soils were found to be considered HSG "A". Due to the proximity to the existing wetland, and the proposed stormwater features being at a lower elevation that the lowest hand boring, we conservatively designed using "D"soils. We recommend that during construction the Geotech engineer examine the soils with either a new boring or test pit to determine that the soils are further down. If they are in fact"A", then we will amend our permit documents to incorporate the better soils. Groundwater: Groundwater was not identified in the geotechnical exploration. 2.3 Proposed Site Conditions: Site Description: The proposed site is a lot split of the parcel with the existing church as one lot and a new senior living facility on the other lot. The senior living site will include parking, landscaping, and two aboveground stormwater filtration basins. The proposed site surface coverage areas are shown in the table below: Drainage Area Impervious Area Pervious Area Total Area Area[SF] CN Value Area[SF] CN Value Area [SF] CN Value PR1A (TO EX WETLAND) 0 98 73524 80 73524 80 P R 1 B (TO FIL BASIN 1) 22963 98 16438 80 39401 90 PR1C(TO FIL BASIN 2) 23783 98 14659 80 38442 91 PR2(TO LONG LAKE RD) 1396 98 4408 80 5804 84 PR3(TO EAST) 0 1 98 302 1 80 302 1 80 P R4(OFF-SITE TO FIL.BASIN 2) 41270 1 98 14517 1 80 55787 1 93 Civil Site Group, PC • 5000 Glenwood Avenue ° Golden Valley Minnesota 55422 vw✓w.CivilSiteGroup.com ° (612)615-0060