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Ms. Katie Larsen <br />08/30/2023 <br />Page 2 <br />Glamos Wire Storage Expansion Engineering Review <br />Pre- and Post- Development Discharge Rates (cfs) <br />Condition 2-Year 10-Year 100-Year 10-Day Snowmelt <br />Existing 18.98 30.11 58.70 Not provided <br />Proposed 17.22 26.86 51.29 Not provided <br />Comments: <br />1.The applicant shall clarify the proposed rim elevation of the pond OCS. The detail <br />shows an elevation of 910.4 and the drainage plan sheet shows 908.1. <br />2.The applicant shall revise the BMP design in the northwest corner of the basin. <br />Locating an inlet that flows over the OCS and into the basin will result in flow <br />shortcutting and potential long-term damage to the structure. It is recommended to <br />shift the inlet location, OCS, or both to avoid this risk. <br />3.The applicant shall revise the riprap shown on the plans to cover the surface down to <br />the normal water level of the pond. Current plans limit riprap to an elevation of 908, <br />leaving approximately 10’ of unarmored ground at risk of erosion from flows into the <br />basin. <br />a.It is also recommended that the NWL and 100-yr HWL footprint of the BMP <br />be shown on the plans. <br />4.As proposed, the swale routed to the inlet at the northwest corner of the pond flows <br />through a fence. The applicant shall revise the fence design at this location to ensure <br />flows can pass freely and without risk of clogging from debris. <br />•Water Supply <br />Utilities are not proposed or shown for the site. <br />Comments: <br />1.We recommend that the City Deputy Director of Public Safety-Fire Division review the <br />proposed plan to verify fire protection <br />•Sanitary Sewer <br />Utilities are not proposed or shown for the site. <br />•Transportation <br />Vehicle access will occur through the existing storage area south of the building. No <br />adverse traffic impacts are anticipated and a traffic study is not required. <br />Comments: <br />1.A vehicle access gate is shown on the northwest corner of the proposed lot, but it is <br />not evident how this gate will be used considering the proposed swale in that location <br />and lack of impervious for driving. The applicant shall clarify this gate design.