Professional Engineering Services for the Design of a Chlorination System at Marengo Reservoir

The City of Alhambra is requesting proposals for professional engineering services to plan, design, and support permitting and construction of a chlorination system replacement at Marengo Reservoir, with proposals due July 23, 2026 at 11:00 a.m.

The scope encompasses replacement of the existing on-site chlorine generation system (over 20 years old) with a sodium hypochlorite storage and feed system, installation of reservoir mixing systems with dual independent mixers in each of the four 2.3-million-gallon tanks, water quality monitoring and control systems utilizing reagentless technologies, and associated electrical, instrumentation, communication, and SCADA integration improvements. Deliverables include comprehensive engineering services from existing-conditions assessment through construction support, regulatory coordination with the California State Water Resources Control Board Division of Drinking Water, engineering reports and technical documentation, and design standardization considerations for potential future implementation at other City reservoir facilities. Design packages must be submitted at 60%, 90%, and 100% completion stages.

Proposers must demonstrate a minimum of five years of relevant experience with at least three similar projects, maintain a Southern California office open during regular business hours, and hold a Professional Civil Engineer license registered in California with demonstrated drinking water facility experience. The selected consultant must maintain $1 million in Professional Liability, Contractual General Liability, and Automobile Liability insurance, with the City named as Additional Insured. A City of Alhambra Business License is required upon contract award. Prevailing wage requirements apply if total compensation exceeds $1,000.

Pricing shall be submitted on an hourly rate not-to-exceed basis with separate time-and-materials reimbursement schedules and hourly rates for each position in a separately sealed envelope. Selection criteria emphasize qualifications in municipal drinking water facility design, recent regional project experience, demonstrated experience obtaining Division of Drinking Water approvals, technical approach soundness, timeline feasibility, and proposal quality. Questions are due July 9, 2026. Contract award by City Council is anticipated for August 24, 2026, with execution and Notice to Proceed on September 14, 2026.