23_Amd0017_P-649-Refresh Dwgs_OSP Revised Signature_Vol25_ET501-ET505.pdf

This is a set of detailed engineering drawings showing specifications for communications infrastructure construction, including handhole details, cable routing, and bridge transition details. The drawings include specific technical specifications for handhole risers, duct entrance windows, cable racks, floor pulling irons, and cable routing configurations. Sheet ET501 provides handhole construction details including plan views, sections and hardware specifications. Sheet ET502 shows cable rack mounting details and handhole riser step specifications. Sheet ET504 contains typical cable routing diagrams for different corner configurations. Sheet ET505 includes bridge transition details and conduit expansion joint specifications.

The drawings appear to be part of the technical specifications for the FY21 MCON Project P-649 Guam Joint Communications Upgrade at Marine Corps Base Camp Blaz, which involves construction of communications infrastructure. The drawings provide detailed engineering specifications that contractors would need to follow for underground communications pathway construction, including precise measurements, materials, and installation requirements for handholes, cable support systems, and pathway transitions.