02/12/2003 P&Z Packet - Laserfiche WebLink

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• • FEB -05 -2003 12:45 CITY OF LINO LAKES 651 982 2499 P.05/11 Engineering Review Page 3 February 5, 2003 Century Farms North (lst -6th Additions) 3. Stonnwater System - Plan Sheets G1, G2 and G1A through G1D: A. Stipulations set forth by Rice Creek Watershed District (RCWD) permit application review /approval process must be met including wetland issues. It will be important for the Developer's Engineer to keep the Lino Lakes City Engineer updated as the review process with RCWD progresses. ultimately, the City will review the approved RCWD permit to determine if its interests are met. The Developer's Engineer has claimed through analysis that water levels in a wetland in Outlot C cannot support the delineated vegetation. They are requesting that the wetland area be reduced by fifty (50) percent. It is the LGU's (RCWD) responsibility to resolve this issue with the Developer's Engineer. Resolution of this issue could involve City Staff input. B. There are concerns of the proposed depths of the stormwater ponds in relation to groundwater elevations. Geotechnical evaluation indicates that the range of groundwater elevations to be in the 891 to 893 range. Many of the proposed stormwater pond bottom elevations would be lower than the range of groundwater elevations. Thus, stormwater capacity will be potentially reduced as well as issues involved with excavating below groundwater levels. C. In general, the City does not allow storm sewer pipes or inlets to be less than twelve (12) inches in diameter. The Developer's Engineer should make the changes necessary to the proposed storm sewer conveyance system and inlet structures to comply with this City requirement. D. Permanent easements with access availability will be required for all stormwater ponds and conveyance system not located within the public rights -of -way. 4. Airport Issues: On the south side of the development site there is an airport runway landing strip area. Since the proposed construction will abut the runway area, it is recommended that the Developer provide written permission (or if a permit is needed) from the appropriate regulating authorities stating that there are no conflicts or issues that affect the airport runway. 5. Street System - Plan Sheets Gl, G2 and G1A through G1D: A. All centerline street grade slopes are to be a minimum of 0.5 %. The Developer's Engineer needs to be aware that all construction plans will be held to this standard including slopes around the perimeter of cul -de- sacs. B. At the east end of Carl Street, a roadway connection to the existing cul -de -sac is recommended to be constructed as part of the Century Farm North subdivision. This should include a thirty -two (32) foot wide permanent street with modifications to the existing cul-de- sac. It is also recommended that utilities and sidewalk be extended in conjunction with the street construction.