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t EXHIBIT C STORMWATER TREATMEIVT FACILITIES MAINTENANCE PLAN The stormwater treatment facilities extend from where water flows from the parking areas into the vegetated swales and bio-retention planters to the storm drain system where the treated water enters the CDS unit before water conveys offsite. Inspection and maintenance of the storm drain system is considered part of the inspection and maintenance of the treatment facilities. Normal functioning of the facilities may involve retention of water for up to 72 hours following significant storm events. BIO-RETENTION PLANTERS/VEGETATED SWALES Observation Maintenance Activity Inspect the bio-retention planters and vegetated swales Clear as much of the vegetated swale and/or planter as possible from and look for obstructions,vegetation,debris,litter, each end with a long-handled tool such as a hoe.Scrape with hoe or sediment,etc.inside the planters and/or swales.Algae similar tool to ensure that water flows freely along the vegetated growing in the planters or swales indicate the presence of swales and/or planters. standing water.Water backing up out of the planter or swale entrance indicates a blockage.During a rainstorm,a blockage will be indicated by slow water flow or by water backing up. Frequency Observation Maintenance Activity Before each Inspect the bio-retention planter and vegetated swale Clear entrances and exits by hand and with hand tools.Ensure that rainy season entrances and exits.Look for obstructions,vegetation, water flows freely into and out of the bio-retention planters and and after the debris,litter,sediment,etc.blocking the entrances and vegetated swales. first heavy exits of the drainage flow. rain. Observation Maintenance Activity Inspect the flow line of the swales and check whether the If the flow-line of the swale entrance or exit has been displaced flow-line of the swale at the entrance or exit has risen vertically,then fill or scrape as necessary to flatten and restore the through siltation or dropped through erosion.Water flow-line of the swale.Ensure that water flows freely into and out of ponding at the entrance or exit may indicate displacement the bio-retention planters and vegetated swales. of the swale flow-line. Observation Maintenance Activity Inspect for large weed or invasive plants growing within Remove any invasive plants,weeds,shrubs,or any plant with a woody 4"of the entrance or exit. stem within 4"of entrance or exit. • 1