RFP - Wastewater Treatment Facilities and Collection System Master Plan

Agency: City of Calexico
State: California
Type of Government: State & Local
Posted Date: Nov 2, 2017
Due Date: Nov 22, 2017
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RFP - Wastewater Treatment Facilities and Collection System Master Plan


The City of Calexico is soliciting request for proposals from qualified firms to provide consulting services to prepare a Wastewater Treatment Facilities and Collection System Master Plan. Local Enterprise funds will be used to pay for this project.

Package will be emailed to consultants November 2, 2017. Deadline for City to receive written questions November 9, 2017, at 3:00 p.m. Written responses for questions (submit questions to ddale@calexico.ca.gov ) received by November 9, 2017, will be available by November 14, 2017 at 11:00 a.m. Proposals must be received by the Office of the City Clerk, on or before:
Wednesday November 22, 2017, at 5:00 p.m.

3.0 SCOPE OF SERVICES ? See Detailed Scope of Work Exhibit A The Consultant will perform these services under the supervision and direction of the Public Works Director/City Engineer. The Consultant shall provide the City with an updated Existing Wastewater System Map showing the pump stations, manholes, pipes, sizes and material types.

The Consultant shall provide the City with a complete Hydraulic Analysis of the existing wastewater collection system. The Consultant shall provide the City with a Proposed Improvements Wastewater System Map using the Existing Sewer System Map as a base map. The Consultant shall prepare an Engineers Opinion of Probable Cost for the identified Wastewater System Improvements.

The Consultant shall provide a Closed-Circuit Television Inspection (CCTV) for 20 miles of the existing sewer collection system (total City collection system comprises 78 miles) to determine the structural condition, location of structural defects, evidence of inflow and infiltration, size and material of construction, service lateral locations, and locate any obstructions such as roots, grease, debris and cross-bores. The Wastewater Treatment Plant capacity is 4.3 million gallons per day (MGD). The current
Plant average flow is 2.9MGD with peak flow of 3.5MGD. The Plant was built in 1967; it has been in service for 43 years. At that time, the plant consisted of one main lift station, influent channel with a manual bar screen, (1) aeration basin, (1) digester, (2) secondary clarifiers and a control building. Since then the Plant has been upgrade three times: In 1974, a grit chamber was added for removal of heavy particles, also added was a primary clarifier, aeration basin, and chlorine contact chamber and return activated sludge (RAS) lift station.

In 1991, the City added aerated lagoons, a new influent station with mechanical bar screen, another main lift station and a new control building with lab. In 1996 federal guidelines required disinfection, so the City added an ultra violet disinfection, another primary clarifier a digester and a 75-foot diameter secondary clarifier. All the upgrades that have occurred over the past 30 years a have been additions not replacement of existing equipment.

The Consultant will assess the existing condition of the Wastewater Treatment Plant components, and make recommendations for rehabilitation or replacement if necessary. The City had plans and specifications prepared in 2007 and revised in 2010 for a
wastewater treatment plant expansion. At the time that the plans were made, the City anticipated more development than occurred. The Consultant shall review the capacity of the existing plant, the current anticipated development and projected population increases, and make recommendations for how much capacity is required within the next 10 years if
any. The Consultant shall prioritize the various components of the WWTP for improvements, if the components are constructed separately.

The Consultant shall prepare a Technical Report outlining existing system deficiencies, alternatives, recommendations for system improvements, Engineers Opinion of Probable Cost for recommended improvements and funding sources for improvements.
See Exhibit A for the detailed Scope of Work.

Consultant must submit five (5) copies of their proposal with original Consultant signature. The proposal must be formatted in accordance with the instructions of this RFP. Promotional material may be attached, but is not necessary and will not be considered as meeting any of the requirements of this RFP. Proposals must be enclosed in a sealed envelope or package, clearly marked SEALED PROPOSAL - DO NOT OPEN WITH REGULAR MAIL and delivered on or before 5:00p.m. on November 22, 2017 to:

Office of the City Clerk
City Hall
City of Calexico
608 Heber Avenue
Calexico, CA 92231

Emailed or faxed proposals will not be accepted. It is the proposers responsibility to assure that its proposal is delivered and received at the location specified herein, on or before the date and hour set.

Questions regarding this Request for Proposal may be directed to:

David Dale, PE, Public Works Director/City Engineer
City of Calexico
608 Heber Avenue
Calexico, CA 92251
or via email at ddale@calexico.ca.gov


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