8525 EVERGREEN WAY BURGER KING 2021-05-10

No. 21 (continued)-Maintenance Standards and Procedures for Bioretention Facilities. Maintenance Recommended Frequency, Condition when Maintenance is Needed Action Needed Component Inspection Routine (Standards) (Procedures) Maintenance Watering(cont'd) Summer watering Once every 2-4 Trees,shrubs and groundcovers in second or third year of •10 to 15 gallons per tree (second and third weeks or as needed establishment period •3 to 5 gallons per shrub years) during prolonged dry •2 gallons water per square foot for groundcover areas periods •Water deeply,but Infrequently,so that the top 6 to 12 inches of the root zone is moist •Use soaker hoses or spot water with a shower type wand when irrigation system is not present o Pulse water to enhance soil absorption,when feasible o Pre-moisten soil to break surface tension of dry or hydrophobic soils/mulch,followed by several more passes.With this method,each pass Increases soil absorption and allows more water to infiltrate prior to runoff Summer watering As needed Established vegetation(after 3 years) •Plants are typically selected to be drought tolerant and not require regular watering after establishment;however,trees may (after establishment) take up to 5 years of watering to become fully established •Identify trigger mechanisms for drought-stress(e.g.,leaf wilt,leaf senescence,etc.)of different species and water immediately after initial signs of stress appear •Water during drought conditions or more often if necessary to maintain plant cover Pest Control Mosquitoes B,S Standing water remains for more than 3 days after the end •Identify the cause of the standing water and take appropriate actions to address the problem(see"Ponded water) of a storm •To facilitate maintenance,manually remove standing water and direct to the storm drainage system(if runoff is from non pollution-generating surfaces)or sanitary sewer system(if runoff is from pollution-generating surfaces)after getting approval from sanitary sewer authority. • Use of pesticides or Bacillus thuringiensis israelensis(Bti)may be considered only as a temporary measure while addressing the standing water cause. If overflow to a surface water will occur within 2 weeks after pesticide use,apply for coverage under the Aquatic Mosquito Control NPDES General Permit. Nuisance animals As needed Nuisance animals causing erosion,damaging plants,or • Reduce site conditions that attract nuisance species where possible(e.g.,plant shrubs and tall grasses to reduce open depositing large volumes of feces areas for geese,etc.) •Place predator decoys • Follow IPM protocols for specific nuisance animal issues(see"Additional Maintenance Resources"section for more information on IPM protocols) •Remove pet waste regularly • For public and right-of-way sites consider adding garbage cans with dog bags for picking up pet waste. Insect pests Every site Signs of pests,such as wilting leaves,chewed leaves and • Reduce hiding places for pests by removing diseased and dead plants visit bark,spotting or other indicators • For Infestations,follow IPM protocols(see"Additional Maintenance Resources"section for more information on IPM associated protocols) with vegetation management , Frequency:A=Annually;B=Biannually(twice per year);M=Monthly;W=At least one visit should occur during the wet season(for debris/clog related maintenance,this inspection/maintenance visit should occur In the early fall,after deciduous trees have lost their leaves);S=Perform inspections after major storm events(24-hour storm event with a 10-year or greater recurrence interval). IPM-Integrated Pest Management ISA-International Society of Arboriculture Volume V—Runoff Treatment BMPs—December 2014 4-59