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Committee reviews $3.0M amendment for Top of Cedars field investigations; Stage 1 contract reaches ~$6.4M
Summary
Staff recommended a Stage 1 amendment with Granite Construction to cover field investigations (borings, test pits, GPR, potholing, surveying) with a not‑to‑exceed amendment of ~$3.0M; combined with prior scope the Stage 1 contract total is about $6.4M and staff said progressive design‑build will reduce schedule and cost uncertainty.
The Sewer & Water technical committee reviewed Amendment No. 1 to the design‑build agreement with Granite Construction Company for field investigation services tied to the Top of Cedars water‑system reconstruction.
Matt, the project presenter, said the amendment is scoped as a unit‑price package to fund geotechnical borings, test pits, ground‑penetrating radar, potholing of utilities and surveying across the project area. He said the amendment's not‑to‑exceed amount for this task is about $3,000,000 and that the amendment brings the Stage 1 contract total to roughly $6,400,000 once prior scope is included.
Staff explained that progressive design‑build lets the team gather real‑time cost data and adjust decisions such as pipe sizing with better information, and staff estimated the multi‑phase reconstruction could be completed in about 3–5 years rather than 6–7 years under a conventional design‑bid‑build approach. Committee members asked for clarification on the apparent difference between a $3,400,000 figure previously in the sewer packet and the current numbers; staff said the original scope shown to the committee was about $3,400,000, the negotiated amendment is ~$2.99–3.0M, and the two figures together produced the reported Stage 1 total of ~$6.4M.
Staff said the scope listed the maximum expected investigative effort but that some borings or survey work may be eliminated later if data reduce risk and contingency needs.
