06/27/2007 Env Bd Packet - Laserfiche WebLink

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Raingardens Raingardens proposed on the site should be designed with a low maintenance (unless there is agreement with new homeowners to manage something different) Maplewood -type of design. Design of these gardens should be submitted to the city as well as a perpetual maintenance plan. All designed ponds and infiltration features must have at least 3 -feet of sand separation between the ordinary high ground water level and the bottom of the structures. Community Drainfield Since there is no sewer and water available to the site (and probably never will be), Moon Marsh proposes the idea of a designed community drain field These types of drain fields can be made to look very aesthetically pleasing and can be designed to be very efficient waste water purifiers. Anoka County Environmental would be concerned that nothing is allowed until they have reviewed and given a favorable report on proposed community drain fields for this property. Archaeological Report An archaeological survey was done because of previous findings to the East of the Wessel property. Nothing significant was found on the Wessel property. Surface Water /Storm Water Pollution Prevention Plan It is recommended that a temporary sediment pond be constructed to capture surface water runoff during construction. All proposed infiltration, wetland and rain - garden soils must be protected during construction. Suggest construction of new surface water features after major construction is complete. Features should be constructed with low impact/compaction, track -types of equipment and fenced off prior to construction. All soils determined to be more compact after construction than prior to construction in drainage/ surface water infiltration or management area will be loosed to pre- construction conditions. It is also recommended that all new yard soils have top -soil incorporated into the subsoil and tilled as deeply as possible. No soil may be imported or exported with out City approval. The following changes should be made to the submitted SWPPP: • Under Erosion Control Prevention and Sediment Control Practices, # 1 should say "All sediment control structures..." • Additional language should be added to say " ditches and disturbed areas must be covered within 24 hours." • #6 should add..." and covered according to permit requirements." • # 13 should add.. "and meeting all final stabilization requirements." • •