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Ms. Katie Larsen <br />08/05/2020 <br />Page 5 <br />The WaR set shall shO-I.A.f the steffn sewer WaR vvei.v aind easement lines nein the same <br />page. This will allnew the f ity to verify all storm earl utility o eRts o GOFFeGt. <br />The plan shoots hero been modified <br />Gaspmpnts ....ill he reviewed with the final rips ign submittal. <br />Easements are not shown with call out on the plans, but the City has verified <br />storm sewer is within drainage and utility easement. <br />The pligant shall verify the rn nhele s es/stormsewer loves it for: <br />a GB 037 tight angle, eensider sterm seweF alignment <br />b GB nnn tight gle larger s+r� �efi ire needed. <br />C. GB 001 tight a gle larger s+rU M ire needed. <br />d. GB 101 tight angle, <br />� �larger s+refi ure needed. <br />e. GB 011, tight a glelarger o+rU GtWe needed. <br />fm GB 013 tight angle, Gensider sewer alignment <br />g GB 008 tight a gle larger s+r� �efi ire needed. <br />h. Additienal GB's r rea between GB 1 & 2 at the rear) bend <br />Gatgh -basin s+ri infi irpcc havp heen re -verified <br />Storm sewer systems and en+eh basin will he reviewed with the final design <br />ihmit+al nrtJitinnal G-R's will her red +o Maintain the s+erm sewer <br />eri+hin 'J fop+ from the r ;;d <br />Noted. (n In 2020 05.08) <br />Storm sewer shall have 15 feet of separation from a structure and include a 20' <br />easement. The applicant should consider a utility and trail corridor between the private <br />road and main road. (between Lots 10-11, Lots 11-12) <br />Noted. (AJA 2020-05.08) <br />This requirement is not met by the storm sewer that runs between Lot 7 and Lot 6. <br />Confirm building footprint shown on plan. Applicant may need to reduce building <br />footprint to meet requirement <br />Our review is based on the assumption that the senior living complex has a finished <br />floor elevation of 910.5 and a 12 foot parking garage below. The ground water in this <br />area is an 897 to 899. They are not meeting the 4 foot of separation from groundwater. <br />It is being proposing to mitigate this with a drain tile and pump system, backup power, <br />and cut off wall. <br />The City could consider reducing the low floor free board requirement of 4 feet <br />separation from groundwater upon submittal of a geotechnical report and design by a <br />licensed engineer. This report shall define ground water level elevations for the senior <br />living complex and include plans demonstrating that potential ground water inflow will <br />adequately be mitigated. The proposed trench grate and draintile will need to be <br />pumped or discharged downstream of the pond. <br />It is recommended to construct an improved outlet for the site, downstream of the pond. <br />It is our understanding that this option would have construction impacts in an existing <br />developed area. <br />This underground dewatering system is being designed by Braun Intertec. Refer to <br />information submitted by Braun. (AJA 2020-05.08) <br />Wold to address <br />The applicant shall show the proposed storm sewer for the turn lanes. We are <br />concerned that there may not be enough grade between the turn lanes and the pond to <br />ensure proper drainage. <br />SEE ATTACHED PRELIMINARY GRADING DESIGN SUBMITTED BY SEH <br />Preliminary grading design shows elevation conflict at MH 106. Final plans from SEH <br />for the turn lanes will be reviewed and must align with Lyngblomsten plans <br />Lyngblomsten Preliminary Plat Engineering Review <br />