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Ms. Katie Larsen <br />04/10/2024 <br />Page 5 <br />Lino Lake Tech Center Engineering Review <br />(Elan 3/26/2024) The 20° notch, as measured from vertical has a 1.25’ rise resulting <br />in a width of 11” at the top of the structure. The 27” diameter structure has an inside <br />circumference of 85 inches. The PS27-33S grate utilizes 4 mounting slots 21” apart, <br />leaving enough room to attach the grate to the structure. <br /> <br /> <br />12. (WSB 3/6/2024) Applicant to correct mismatch between V-notch invert shown on <br />plans and model. Plans show invert of 899.5, while modeling has invert of 899.75. <br />(Elan 3/26/2024) The plans updated for the watershed show a consistent 899.5 <br />elevation for the bottom of the notch. <br /> <br /> <br />13. (WSB 3/6/2024) Applicant to include air gap between roof leader and drainage pipe <br />routing to BMP on the west side of the building. <br />(Elan 3/26/2024) The runoff from the roof will be collected in a system internal to the <br />building connected to the pipe shown on the plan. Please explain where and why you <br />want this air gap. <br />(WSB 4/5/2024) Air gap requirement to be determined by the City Building <br />Department review. <br /> <br /> <br />14. (WSB 3/6/2024) Applicant to shift CBMH 1 and CBMH 2 away from retaining wall in <br />order to allow for proper compaction around structures. Recommended distance is <br />1.5x structure build height to allow for 1.5:1 compaction. <br />(Elan 3/26/2024) These structures will be installed prior to constructing the retaining <br />walls and will be located within the reinforcement grid for the wall which will be hand <br />compacted. They will be moved if deemed necessary by the wall designer. Otherwise <br />we chose to keep them in their present location adjacent to the curb. <br />(WSB 4/5/2024) Confirmation with the wall designer is requested. <br /> <br /> <br />15. (WSB 3/6/2024) Ductile iron pipe is recommended for storm sewer runs with less <br />than 2’ of pipe cover in order to ensure pipe longevity. <br />(Elan 3/26/2024) All pipes have at least two feet of cover. <br /> <br /> <br />16. (WSB 3/6/2024) Applicant to check utility conflicts between storm sewer and <br />watermain. <br />(Elan 3/26/2024) Elevations at all crossings have been added to the plan. <br /> <br /> <br />• Water Supply <br /> <br />Water is shown being supplied for the site by connecting to the water line of the existing <br />storage site to the north. An additional connection may be made across Lake <br />Drive/CSAH 23 if the single 6” stub is found to be inadequate for the requirements of the <br />site. <br /> <br />Comments: <br />1. Applicant to provide a utility plan for the site meeting City requirements. <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 />118