07/31/2002 Env Bd Packet - Laserfiche WebLink

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,11/4y/kt-t- Construction, Monitoring, Operation and Maintenance Plan For Infiltration Basins in the Spirit Hills Development, Lino Lakes. The overall objective for this maintenance plan is to ensure the longevity of the Infiltration basins designed as part of the stormwater management plan. Introduction Infiltration basins are designed to retain and infiltrate the stormwater runoff generated for a given design rainfall event. The success of an infiltration practice is dependent upon a number of things: naturally permeable soils and subsurface material, sufficient depth to the water table and /or a restricting layer such as bedrock or a hardpan layer, proper construction, proper operation and maintenance and pretreatment of stormwater to prevent clogging of the soils. In addition, a review of the soil borings of this development shows that there is sufficient depth to the water table to prevent a water table mound from forming underneath the infiltration ponds and affecting roads and other infrastructure. As a result, the following issues are addressed in this Operation & Maintenance Plan to ensure the short and the long -term performance of the infiltration ponds: • Ensure Proper Construction of Infiltration Basins /Ponds • Minimize Sediment Loading to the Infiltration Basins /Ponds • Develop a Monitoring Plan • Short - Term Maintenance Requirements • Long Term Maintenance Requirements Construction of Infiltration Basins /Ponds Proper construction is extremely important in ensuring the successful operation of an infiltration practice. The following recommendations regarding the excavation, timing of construction, equipment requirements, and landscaping plan will be incorporated in the final plans and specifications. • Excavation of Materials in Infiltration Basins/Ponds Page 1