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Council considers change order to water master plan to address chlorination compliance and capital priorities
Summary
Staff proposed a change order to the Cedar Canyon water master plan contract to add capital cost estimates, a Cross Hollow-area master-plan amendment, and chlorination assistance tied to a Division of Drinking Water stipulated order; staff said work is time-sensitive and budget revision will be presented to cover costs.
Jonathan Stathis presented a proposed change order to the Hansen, Allen & Luce contract for the Cedar Canyon water master plan. The amendment would add: (1) capital water project cost estimates, priorities and timelines to inform the city budget ($24,900 cited for that task in the discussion); (2) a more detailed master-plan amendment for the Cross Hollow/Iron Horse area that addresses pipeline sizing, pump stations and elevation/pressure-zone challenges; and (3) chlorination assistance to address requirements under a Division of Drinking Water stipulated order.
Stathis reviewed the compliance timeline: the stipulated order was formally approved on Nov. 13 (staff said) and the Division approved the city's response on Jan. 13, triggering a six-month timeframe for implementation of required chlorination improvements. Staff said plans are in to the Division of Drinking Water for a chlorination system at the ENIQL No. 3 site and that some generator and chlorinator upgrades are needed for other tanks. The most difficult element is chlorinating the high-pressure Quichipaw wells; staff and council discussed intermediate booster pumping or a west-of-town chlorination location to reduce the need for specialized high-pressure chlorine equipment.
Stathis said the city prefers to continue working with Hansen, Allen & Luce because the firm is familiar with the city's water system and modeling. Staff also noted the proposed change order would exceed the Cedar Canyon water master-plan budget and that a budget revision would be presented at an upcoming meeting; the chlorination portion could be paid from an existing project where applicable.
Council asked staff to move the change order to the action calendar so engineers can present findings at the March 21 retreat; staff said preliminary conversations with the Division of Drinking Water indicate the state may grant extensions if the city submits a concrete implementation plan.
