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  Consent-Community Services   #   37.    
Board of Supervisors Community Services  
Meeting Date: 07/24/2018  
Brief Title:    Anaerobic Composter Geosynthetic Installation Complete
From: Taro Echicuru, Director, Department of Community Services
Staff Contact: Ramin Yazdani, Director, Division of Integrated Waste, Department of Community Services, x8848

Accept the Anaerobic Composter Geosynthetic Installation at the Yolo County Central Landfill constructed by COMANCO Environmental Corporation as complete, and authorize the Director of Division of Integrated Waste Management to sign and record the Notice of Completion and pay the final estimate releasing retention. (No general fund impact) (Echiburu/Yazdani)
Recommended Action
  1. Accept the work on the Anaerobic Composter Geosynthetic Installation at the Yolo County Central Landfill constructed by COMANCO Environmental Corporation; and
  2. Authorize the Director of Division of Integrated Waste Management to sign and record the Notice of Completion and pay the final estimate releasing retention.
Strategic Plan Goal(s)
Operational Excellence
Sustainable Environment
Flourishing Agriculture
Reason for Recommended Action/Background

The Board of Supervisors acceptance of the work and authorization for the Director of Division of Integrated Waste management to record the Notice of Completion, will begin the one year construction warranty and allow staff to make the final payment to COMANCO Environmental Corporation.

California has a statewide goal to divert 75 percent of waste from the landfill by 2020. In February 2007, the California Department of Resources Recycling and Recovery (CalRecycle) adopted Strategic Directive (SD) 6.1, which calls for a 50 percent reduction in the amount of organics being disposed in landfills by 2020. Organic waste makes up approximately one third of the 42.7 million tons of waste that is currently going to the landfills in California. To aid in meeting the statewide 75 percent goal, Assembly Bill 1826 was passed in September 2014 requiring businesses, including state agencies, which generate certain amounts of organic waste per week to have organic waste recycling programs on or after April 1, 2016. 

Between 2006 and 2015 the Division of Integrated Waste Management received $322,554 in grant funding from CalRecycle and the California Energy Commission (CEC) for two innovative Anaerobic Composter demonstration projects in collaboration with University of California at Davis. The Anaerobic Composter project utilizes space on an existing landfilled area to create a series of reusable digester cells that recover methane gas for electricity generation while decomposing organic material into compost product. Placing the Anaerobic Composter cells on top of a lined landfill has several advantages. First, the underlying groundwater is better protected and second, by utilizing on-site gas collection facility and other liquid and gas collection piping, the project requires less capital cost, which makes this project more cost effective. After the methane generation and organic material decomposition rates attenuate, the system is operated aerobically to cure the residual decomposed organics, is excavated to remove the compost, and the cell is reused to receive the next batch of organic waste. The compost is a sellable product that has applications in agriculture and horticulture and can be used as a soil amendment on or off-site.

In September of 2017 the California Regional Water Quality Control Board approved the plans and specifications for the construction of Anaerobic Composter. The construction project was advertised for bidding on January 19, 2018 and on March 9, 2018 three bids were received. The lowest responsive bidder was COMANCO Environmental Corporation. On April 3, 2018 the construction project was awarded to COMANCO Environmental Corporation. The construction started on June 4, 2018, and  finished by July 13,  2018, 10 days before the last working day in the contract. The proposed date of the Notice of Completion is July 24, 2018.

Collaborations (including Board advisory groups and external partner agencies)
Division staff worked closely with staff from the Water Board to insure that construction met the design specifications.
Competitive Bid Process
Project was released for bid prior to construction.
Bids Received
Bidder Bid
COMANCO Environmental  Corp. $169,704.23
Erosion Control Applications, Inc. $296,088.56
Sierra Geosynthetic Services $220,100.51

Fiscal Information
Fiscal impact (see budgetary detail below)
Fiscal Impact of this Expenditure
Total cost of recommended action $174,298
Amount budgeted for expenditure $204,000
Additional expenditure authority needed $0
One-time commitment     Yes
Source of Funds for this Expenditure
Sanitation Enterprise $174,298
Further explanation as needed
The cost of this construction project will be paid by the Sanitation Enterprise Fund, which is funded through tipping fees collected at the landfill. There will be no impact to the General Fund. The total cost of this construction project was below the budgeted amount of $204,000.
Att. A. Notice of Completion
Att. B. Project Photos

Form Review
Inbox Reviewed By Date
Taro Echiburu Taro Echiburu 07/11/2018 04:28 PM
Financial Services bporter 07/17/2018 04:35 PM
County Counsel Hope Welton 07/17/2018 04:48 PM
Form Started By: Ramin Yazdani Started On: 07/09/2018 02:52 PM
Final Approval Date: 07/17/2018
Level double AA conformance,
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