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November 3,2014 <br /> Proposal for Old 371 —Main to Rae WIDSETH <br /> City of Pequot Lakes SMITH <br /> Page 4 NOLTING <br /> 4. Field survey all underground and above ground features of the existing Gravdahl infiltration <br /> basin to prepare a base map. <br /> If an overflow of this basin is needed, and after review with the City, we would conduct a <br /> field survey south past the City lift station and then to the east towards a natural low area <br /> as an Additional Service. <br /> 5. Analyze watermain depth via gate valve depths. <br /> If the resulting cover with the new roadway profile is a cause of concern, as an <br /> Additional Service, we will review with the City and determine whether digging down and <br /> insulating or replacing the watermain at a deeper depth is the best course of action. <br /> 6. Analyze sanitary sewer depth via manhole depths. <br /> If the resulting cover with the new roadway profile is a cause of concern, as an <br /> Additional Service, we will review with the City and determine whether digging down and <br /> insulating or replacing the sanitary sewer at a deeper depth is the best course of action. <br /> 7. Review with the City where they want to incorporate additional watermain valves along Old <br /> 371 and include these in the drawings. <br /> 8. If the City so desires, and as an Additional Service, we can review with staff on how we are <br /> going to extend watermain and serve the area from the east side of Old 371 over to the new <br /> 4-lane Highway 371. <br /> 9. If the City so desires, and as an Additional Service, we can review with staff on how we are <br /> going to extend sanitary sewer and serve the area from the east side of Old 371 over to the <br /> new 4-lane Highway 371. <br /> 10. Review the needed volume versus the existing volume of the existing Gravdahl infiltration <br /> basin. Review deepening it as needed. <br /> 11. Review grades of the new street and the elevation of the existing Gravdahl infiltration basin <br /> (may need to deepen it) to determine if gravity storm sewer can run along the whole <br /> corridor. <br /> 12. There may be a location or two—initial indications are that it might be between the north <br /> and south legs of Rae—where gravity storm sewer to the existing Gravdahl infiltration basin <br /> will not work. <br /> If this is the case, a new infiltration basin will need to be designed and constructed near <br /> an intermediate low point. It would also involve permanent easement definition and <br /> acquisition. Should this be the case, we will first review the scope and effort with the City <br /> and treat it as an Additional Service. <br /> 13. Design a new storm sewer system of catch basins/curb inlets and piping for a 5-year storm. <br /> 14. With the additional flow to the existing Gravdahl infiltration basin over the present, look into <br /> where overflow from this basin would be routed. <br /> N:\Marketing Dept\Proposals\.Letter Proposals\2014 Letter Proposals\Pequot Lakes-Old 371 -20141103.docx <br />