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Verizon Communications-Stormwater Site Plan Everett,WA <br /> Vault Structure Damage to Wall, Cracks wider than'/inch and any evidence of soil Vault replaced or repaired to design <br /> Frame,Bottom,and/or particles entering the structure through the cracks, specifications. <br /> Top Slab or maintenance/inspection personnel determines <br /> that the vault is not structurally sound. <br /> Damaged Pipe Joints Cracks wider than 1/2inch at the joint of any No cracks more than Y inch wide at <br /> inlet/outlet pipe or any evidence of soil particles the joint of the inlet/outlet pipe. <br /> entering the vault through the walls. <br /> Baffles Damaged Baffles corroding,cracking warping,and/or Repair or replace baffles to <br /> showing signs of failure as determined by specification. <br /> maintenance/inspection person. <br /> Access Ladder Damaged Ladder is corroded or deteriorated,not functioning Ladder replaced or repaired and <br /> properly,missing rungs,cracks,and misaligned. meets specifications,and is safe to use <br /> as determined by inspection <br /> personnel. <br /> NO. 6 — BIORETENTION AREAS <br /> Defector Problem Condition When Maintenance is Needed <br /> Maintenance Recommended Maintenance to <br /> Component Correct Problem <br /> Watering Maintain drip irrigation Watering may be required during prolonged dry Plants should be selected to be <br /> system without breaks periods after plants are established.Hand water as drought tolerant and not require <br /> or blockages. needed for specific plants. watering after establishment(2-3 <br /> years).Establish vegetation with a <br /> minimum 80°/survival rate.Twice <br /> annually(May and July)or as <br /> indicated by plant health. <br /> Clean Curb Cuts Blocked Flows Maintain proper flow of stormwater from Remove any accumulation of debris <br /> paved/impervious areas to bioretention facility. from gutter and entrance to <br /> Twice annually(October and January). bioretention area. <br /> Remove and/or Prune Overgrown Vegetation Depending on aesthetic requirements,occasional Maintain adequate plant coverage <br /> Vegetation : pruning and removing dead plant material may be and plant health.Reduce shading of <br /> necessary.Once or twice annually. under-story if species require sun. <br /> Maintain soil health and infiltration <br /> capability.Maintain clearances from <br /> utilities and sight distances. <br /> Weeding Undesired Vegetation Periodic weeding is necessary until plants are Reduce competition for desired <br /> established.The weeding schedule should become vegetation and improve aesthetics. <br /> less frequent if the appropriate plant species and Remove by hand prior to major weed <br /> planting density have been used and,as a result, species disbursing seeds(usually <br /> undesirable plants excluded. twice annually) <br /> Mulching Replacement Needed Consider replacing mulch annually in bioretention Use compost in the bottom of the <br /> facilities where high pollutant loading is likely(e.g. facility and wood chips on side slopes <br /> contributing areas that include quick marts).Once and rim(above typical water levels). <br /> annually or every two years. Replace or add mulch with hand tools <br /> to a depth of 2-3 inches. Replenish <br /> organic material in soil,reduce <br /> erosion,prolong good soil moisture <br /> level,and filter pollutants. <br /> Trash Removal Clogging and Maintain aesthetics and prevent clogging of Remove trash. <br /> Aesthetics infrastructure.Twice annually. <br /> Maintain Access to Access blocked or Prevent clogging of infrastructure and maintain Clear vegetation within 1 foot of <br /> Infrastructure hidden: sight lines and access for inspections.Once inlets and out falls,maintain access <br /> annually. pathways. <br /> PACLAND Job#50183001 Page 29 <br />