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Level 2 Inspection: BIORETENTION NOTE: Key Source for this Information (CSN, 2013) Recommended Repairs Triggers for Level 3 Inspection Observed Condition: Water Stands on Surface for More than 72 Hours after Storm Condition 1: Small pockets of standing water Use a soil probe or auger to examine the soil profile. If isolated areas have accumulated grit, fines, or vegetative debris or have bad soil media, try scraping off top 3 inches of media and replacing with clean material. Also check to see that surface is level and water is not ponding selectively in certain areas. Soil media is clogged and problem is not evident from Level 2 inspection. Level 2 inspection identifies problem, but it Condition 2: Standing water is widespread or covers entire surface cannot be resolved easily or is associated with the original design of the practice. Requires diagnosis and resolution of problem: Clogged underdrain? Filter fabric between soil media and underdrain stone? Need to install underdrain if not present? Level 3 inspection necessary Too much sediment/grit washing in from drainage area? Too much ponding depth? Improper soil media? Observed Condition: Vegetation is sparse or out of control Condition 1: Original design planting plan seems good but has not been maintained, so there are many invasives and/or dead plants Vegetation deviates significantly from Will require some horticultural experience to restore vegetation to intended original planting plan; Bioretention has condition by weeding, pruning, removing plants, and adding new plants. been neglected and suffered from deferred maintenance. Owner/responsible party does not know Condition 2: Original design planting plan is unknown or cannot be how to maintain the practice. actualized A landscape architect or horticulturalist will be needed to redo the planting plan. Will likely require analysis of soil pH, moisture, organic content, sun/shade, and other conditions to make sure plants match conditions. Plan should include Level 3 inspection necessary invasive plant management and maintenance plan to include mulching, watering, disease intervention, periodic thinning/pruning, etc. Observed Condition: Bioretention does not conform to original design plan in surface area or storage Condition 1: Level 2 Inspection reveals that practice is too small based More than a 25% departure from the on design dimension, does not have adequate storage (e.g., ponding approved plan in surface area, storage, or depth) based on the plan, and/or does not treat the drainage area runoff drainage area; sometimes less than this as indicated on the plan threshold at the discretion of the Level 2 inspector. Small areas of deviation can be corrected by the property owner or responsible party, but it is likely that a Qualified Professional will have to revisit the design and attempt a redesign that meets original objectives or that can be resubmitted to the municipality for approval. Level 3 inspection necessary Page 2 of 4 Page 298 of 1493