06/10/2020 P&Z Packet - Laserfiche WebLink

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Ms. Katie Larsen 06/03/2020 Page 2 conveyance system and ponds. The site is designed to reduce site runoff rates for the 2-, 10-, and 100-year rainfall events. Pre- and Post- Development Discharge Rates (cfs) Condition 2-Year 10-Year 100-Year Pre -Development 7.50 9.57 16.06 Post -Development 7.43 9.56 13.88 Post -development stormwater discharge rates are less than the pre -development rates. Comments 1. Correct reference error on SWMP page 7 (page 11 of the pdf document). 2. Correct contour legend for proposed grading and utility sheet proposed contours. 3. Include Existing Pond D in the existing conditions HydroCAD model or provide basis as to its absence. 4. Include roof runoff discharge point and how it connects into proposed storm sewer. 5. Include wetland designation for the regulated Existing Wetland N, provide OHW, HWL, and bounce for it as well. 6. Provide storm sewer design calculations as well as inlet capacities assumed for CBs. 7. Confirm if there will be riprap placed at EX FES 3 and EX FES 12 to manage discharge rates into existing wetlands. • Water Supply There is existing 8-inch diameter ductile iron pipe (DIP) watermain along Main Street (CSAH 14/ CR 8) north of the site and existing 12-inch diameter DIP along Victor Path east of the site. The applicant is proposing to extend the existing 8-inch diameter DIP water service located on the west side of the property to serve the additional building. The watermain will extend through the proposed parking area and connect into the east side of the proposed building. Comments: 1. Loop watermain through site or provide documentation that the proposed watermain meets fire flow and pressure requirements. 2. Use City of Lino Lakes Standard Details for all hydrant assemblies and leads. 3. Staff recommends that applicant update the watermain layout so that no 90' bends are used where two 45' bends are feasible. 4. Applicant shall identify areas where insulation between the storm sewer crossings and the watermain will be needed on the watermain profiles. 5. The City's Deputy Director of Public Safety — Fire Division is reviewing the watermain and fire hydrant layout. 6. Please verify that the proposed water service is far enough from the building to safely perform maintenance and repairs to the pipe. The plans currently show 12-ft minimum separation between the proposed water service and the proposed building. • Sanitary Sewer There is existing 8-inch polyvinyl chloride (PVC) sanitary sewer along Main Street (CSAH 14) north of the site. The sanitary service for the existing building extends along the west side of the property. The applicant is proposing to extend the existing sanitary service located on the west side of the site to serve the additional building. The applicant is proposing to use 6-inch diameter PVC pipe that will extend through the proposed parking area and connect into the east side of the proposed building. Comments: Laborers Training Center Engineering Review