Specifications include, but are not limited to: General Maintenance Tasks Native Grass Mowing Mow or trim vegetation to an approx. height of 6 inches and remove thatch for all three bioretention systems. Includes removing all vegetation from the cobblestone surface in the east bioretention system Spring Litter Collection (Trash & Debris) Collect and remove trash, debris, and vegetative debris for all three bioretention systems Throughout season Outlet Structure Maintenance Remove debris build-up around structure Throughout season & after rain events Vegetation Monitoring & Maintenance Monitor vegetative plant health within bioretention. Replant, cutback, thin-out as necessary Throughout season Monitor and remove invasive and weed plant species; appropriate herbicide applications can be used selectively through growing season Throughout season Monitor for volunteer trees within bioretention systems and remove if found Throughout season Water any replacement plants in bioretention systems As necessary Sediment Removal Remove sediment from bioretention system inflow channel when 50% of the flex-a-mat is 100% covered As needed (1x/year) Monitor and remove sediment from the infiltration cell and replace the BSM to bring it back to its original elevation Throughout season Monitor and remove sediment build-up across the bottom of the bioretention system, including within the cobblestones. As needed (1x/year) Erosion Monitor and address minor instances of erosion. If significant, share with point of contact to discuss. Throughout season
