Pohick Bay Regional Park Pirates Cove Waterline Extension Addendum 1

The Pirates Cove Waterline Extension at Pohick Bay Regional Park calls for the replacement of an existing 3‑inch cast‑iron well water line, installation of a new 4‑inch HDPE main, and connection to two existing 3‑inch cast‑iron lateral pipes using mechanical joint fittings and a DIP tee. Work includes trenching within a defined L‑shaped Limits of Disturbance, cleaning existing pipe, installing a thrust block (spec attached), and no backflow preventer is required. All other bid requirements remain unchanged. • Existing infrastructure: two 3‑inch cast‑iron pipes (well line and pool lateral) to be cleaned and retained. • New work: install 4‑inch HDPE main, 4″×3″ DIP reducer, 3″×3″ DIP tee, mechanical joint connections, and thrust block per attached spec. • Trenching limited to the L‑shaped Limits of Disturbance on sheet 7; trench does not have to occupy the entire area. • No backflow preventer needed; thrust block design provided. • Project is in the bidding phase; all bidders must incorporate these clarifications.