Stormwater Management Report 4898 2292 85031

Client: Gomes Management Project: 525 Northfield Avenue, West Orange, NJ Page: 9 Date: 09/03/2024 Protection of Utilities: Existing utilities, in the area of construction should be marked to protect from damage during excavation and foundation construction. Excavations should be stopped if they could potentially undermine existing utilities. Excavation & side slope: An unbraced excavation slope of 2.0 horizontal to 1 vertical or flatter may be considered in the planning for construction. Sheeting and bracing, and or slope stabilization systems should be used wherever the unbraced slope pass beneath utilities or structures, the active roadway arrears and/or where it is found to be necessary or more cost effective to use sheeting in order to limit the size of the excavations and maintain traffic. Sheeting and bracing systems and excavation slopes may be designed using the soil properties presented in summary table provided earlier. Proof rolling and compaction of Pavement and Fill Subgrades: Following stripping or excavation to plan elevations, all subgrades for placement of new foundation or parking lot pavement should be proof rolled using a vibratory roller with minimum 1 ton static weight in confined areas along side walls and 10 tons static weight in the footprint of the building and general roadway paved areas. Footing subgrades should be compacted with small area vibratory plate compactors. Proof rolling should be observed and evaluated by a qualified Geotechnical engineer or technician familiar with site conditions. MINIMUM PAVEMENT DESIGN SECTIONS: ACCESS ROAD AND TRUCK TRAFFIC AREAS Bituminous Concrete Surface Course (NJDOT I-5) 2 inches Bituminous Concrete Base Course (NJDOT I-2) 4 inches Quarry Process Sub-Base Course (NJ DOT DGA) 6 inches TOTAL SECTION THICKNESS 12 inches AUTOMOBILE PARKING AREAS Bituminous Concrete Surface Course (NJDOT I-5) 2 inches Bituminous Concrete Base Course (NJDOT I-2) 3 inches Quarry Process Sub-Base Course (NJ DOT DGA) 4 inches TOTAL SECTION THICKNESS 9 inches As previously discussed, it is recommended that the loose soils at the surface should be proof rolled and densified with a heavy vibratory compactor. With this recommended compaction, a CBR value of six (6) would be appropriate for use in the design of flexible pavements over site soils with imported granular fill, the CBR could be about eight

tor. With this recommended compaction, a CBR value of six (6) would be appropriate for use in the design of flexible pavements over site soils with imported granular fill, the CBR could be about eight (8). RECOMMENDED SERVICES: It is recommended that we should be retained to provide continuous observation and Soil engineering services during the excavation and foundation construction phases of the work. This is to observe compliance with the design concepts, specifications and recommendations, and to allow design charges in the event that subsurface conditions differ from those anticipated prior to start of construction. LIMITATIONS: The recommendations contained in this report are our best professional judgment as