08/09/2023 P&Z Combined Packet - Laserfiche WebLink

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Ms. Katie Larsen 07/28/2023 Page 3 Milestones Addition & Lil Explorers Childcare Center Engineering Review 4.(5/3/2023) The City of Lino Lakes does not allow roof drains to be connected directly to storm sewer. Roof drains need to have a 6-inch air gap before draining to the storm sewer. Applicant to provide detail on plans. (5/19/23) Note of 6” gap added 5.(5/3/2023) Infiltration rate testing is needed to ensure sufficient infiltration capacity is present in site soils. Double ring infiltrometer or modified Phillip- Dunne testing is recommended to determine these rates. Testing must be completed prior to final plat appro val. (5/19/23) Testing is scheduled (5/19/23) This comment remains open until testing results are provided. 6.(5/3/2023) Applicant to verify the constructability of CBMH-4. The pipes proposed to come in at an acute angle may require a large diameter drainage structure to ensure sufficient concrete is provided betwee n pipe openings. (5/19/23) The CB will be sized as necessary 7.(5/3/2023) Applicant to provide riprap at the FES-5 inlet to the north infiltration basin. (5/19/23) Riprap added 8.(5/3/2023) Applicant to provide a bioroll weir at FES-5 for sediment control. (5/19/23) added 9.(5/3/2023) Applicant to provide silt fence around FES-6 until final stabilization has been achieved to minimize risk of sediment loading to City stormwater infrastructure. (5/19/23) added 10.(5/3/2023) Applicant to provide silt fence around infiltration basin s until final stabilization has been achieved to maintain infiltration capacity. (5/19/23) Compost logs will be added in lieu of silt fence because they function better in this application and it avoids future impacts of silt fence removal. 11.(5/3/2023) Applicant to revise vegetated filter strip pretreatment for the south infiltration basin in accordance with MN Stormwater Manual design standards. This primarily entails providing a strip at l east 3-ft wide and with a slope of 2- 6% along the impervious areas flowing to the basin. (5/19/23) Added strip 12.(5/3/2023) Applicant to provide a sump on CMBH-5 to provide pretreatment prior to discharge to the north infiltration basin. (5/19/23) Sump added 13.(5/3/2023) Modeled curve numbers of disturbed pervious areas must be revised to account for the effects of soil compaction. Per City and Watershed standards, B soil pervious areas must be revised to have a curve number of 74. (5/19/23) revised 14.(5/3/2023) Please clarify the drainage areas map. Drainage areas 2.2 is shown but not referenced anywhere else in the SWMP. Additionally, the scale bar on the proposed conditions drainage area map is unclear. (5/19/23) Removed 2.2 from map 15.(5/3/2023) Exfiltration cannot be included in the modeling of the proposed basins in HydroCAD. (5/19/23) Exfiltration removed. 16.(5/3/2023) The outlet pipe for the north infiltration basin must be updated to reflect the inverts shown in the plans.