1240815MAINTENANCE MANUAL rcd 3 12 2026

Basic Design Information This section shall be filled out by the design engineer. Hydrology Design Targets 1. The system is porous pavers with storage bed. 2. This system is designed with a soil permeability rate of 5.8 inches/hour (pre- construction) and 2.9 inches/hour (post-construction). 3. The design drain time is 24.10 hours. 4. The elevation of the seasonal high water table of this pavers area was observed on 06-30-2025 and it was more than 7 feet below the pavers bottom surface, at EL. 413.50 feet. 5. The TSS removal rate is 80%. Hydraulic Design Targets 1. This system is designed to infiltrate the runoff from the (Water Quality Design Storm / groundwater recharge storm), which generates 0.168 acre feet of runoff. The peak flow entering the system is 0.45 cubic feet per second. 2. The invert elevation of the overflow outlet is at EL. 414.50 feet. System Configuration Targets 1. The system has no pretreatment. 2. The depth of uniformly graded coarse aggregate in the storage bed is 32 inches. 3. The top of the system is for permeable pavers only. Critical Maintenance Features 1. Avoid sand or silt onto the porous pavers area. 2. Sweep and vacuum the porous pavers area often to prevent clog. 3. Do not apply sealant to cracks or entire surface. 20