Agenda - Council - 09/23/2003 - Laserfiche WebLink

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Preliminary Summary of City Engineer Plan Review Ramsey Town Center Plans Dated 27 August, 2003 Page 6 of 9 · Zeolite Street between West Ramsey Park Way North and South shows a storm sewer connection to the ponds east and west of Zeolite. Details were not provided for this structure and it appears that the trunk sanitary sewer may conflict with this undefined structure. o City staff has reviewed several options for relocation of the trunk sanitary sewer line. It appears that the line can be shifted east 1 block, passing under East Ramsey Parkway at the east end of the divided section. There are no regional storm sewers in this intersection. This will also provide a lower invert in the subdivision north of Bunker Lake Boulevard. o Staff also evaluated running the sanitary sewer along the south side of the pond west of Zeolite then north along the first street west of Zeolite. This resulted in an invert with too shallow cover north of Bunker Lake Boulevard. · East Ramsey Parkway South at Peridot storm sewer sizes must be updated to show connections from charter school site per plans submitted for charter school. · The 78" storm sewer under the railroad tracks does not have 5 ½ ft of cover below the top of rail, the minimum acceptable cover for the railroad. Stormwater Management The site is served by regional stormwater treatment ponds created as part of this development. -The stormwater management plan submitted with the final plat indicates on-site storage and infiltration is a vital part of the plan. Each developer of a parcel must be made aware of the details of the stormwater plan for the parcel so that the regional system is not overloaded and so that each parcel incorporates the necessary onsite storage or infiltration. Construction phasing must be coordinated with the stormwater management plan to ensure tha~t necessary regional improvements will be in place prior to completion of construction on the parcels causing the need for the regional upgrades. Water Supply The AUAR referenced the Well Head Protection Area(WHPA). The WHPA covers most of the site since there are several existing and planned municipal wells on the site. The contract documents should address the WPHA and require parking and servicing of heavy construction equipment outside the WPHA. Notes on the grading plan note sheet do address some of these concerns. The language should be strengtlxened in the contract documents for the mass grading and for all future construction contracts. Last printed September 15, 2003