Addendum-7-DWG-7E-16563_28_color_a.pdf

This is Addendum 7, a technical drawing (DWG-7E-16563_28_color_a.pdf) for SEPTA's Traction Power Substation Rehabilitation Program covering the Broad, Loudon, Park, and Castor substations. The drawing contains annotated callouts and markup lines highlighting critical electrical infrastructure information at the Grange location, specifically noting that all equipment at Grange operates at 5 KV voltage. The addendum identifies an approximately 40-year-old cable that may be rated at 15 KV and indicates multiple lateral cables believed to still be 5 KV rated, with polygon markings delineating these cable locations.

This technical addendum provides essential existing condition information for bidders preparing responses for the two-step procurement, with RFQ proposals due July 15, 2026 at 11:00 AM and mandatory site visits scheduled for June 11-12, 2026 at Loudon/Park and Broad/Castor substations respectively. The drawing documentation clarifies voltage ratings and cable age for existing infrastructure that contractors will need to consider when completing final design from 50% specifications and performing the 2,035 calendar-day rehabilitation project involving replacement of 13.2kV and 12kV switchgear, DC rectifiers (750VDC and 600VDC), transformers, and associated electrical systems. Bidders must provide 5% bid security and 100% performance and labor/material payment bonds, with bids remaining firm for 90 days from opening, and contractors required to perform at least 20% of work with their own forces while maintaining continuous traction power service throughout phased construction.