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Monitoring Plan <br />Monitoring of infiltration practices is important in evaluating their short and long term <br />performance as well as in the identification of their short and long term maintenance <br />requirements. It is recommended that visual observation of the infiltration ponds be performed <br />by the developer of Spirit Hills on a routine basis. The Developer may hire personnel to do the <br />monitoring if he wishes to do so. The change in standing water depth above the basin floor <br />over time should be checked: <br />1. A StrathAyr double ring infiltrometer test shall be done to get an initial infiltration <br />rate. <br />2. A minimum of six major rainfall events per year to monitor long- term infiltration <br />rates. <br />3. After each major rainfall event in the first few months of construction to monitor <br />infiltration rates. <br />This visual inspection will provide information on the degree of surface clogging that may <br />occur over the years and will help to identify the short- and long- term maintenance <br />requirements. As a general rule, the ponds should infiltrate the volume of water generated <br />from a 2.5" rainfall event plus the run -off from the Minneapolis -St. Paul median storm of <br />0.34 "in 72 hours. Limiting the loading time to 72 hours allows for plant growth on the bottom of <br />• the basin and prevents the development of anaerobic conditions in the soils. <br />Maintenance Plan <br />The developer shall be responsible for maintaining the stormwater management practices <br />located on the site prior to city acceptance of the project improvements. This shall be at the <br />time of substantial completion. Substantial completion is that state of progress of the work <br />when the work or designated portion thereof is sufficiently complete in accordance with the <br />contract documents, so that the owner can utilize the work for its intended use. <br />The homeowner's association shall be responsible for maintaining the stormwater <br />management- practices located on the site after substantial completion or project acceptance, <br />whichever comes sooner, but not before the homeowner's association is a legal entity. <br />Page 3 <br />