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Ventura, CA Sample Bid Opportunity #686722

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Construction Manager

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Categories: Drilling, wells, monitoring
Bid Number: B-130000670
Bid Description: Ventura: w/ *ADDENDA 1-2* Rehabilitation of Mound Well No. 1. The well was drilled in 2000 using the reverse circulation rotary drilling method and constructed as shown on Plate 1 – Mound Well No. 1 Record Drawing. The test production rate of the well at the time of construction was 3,100 gallons per minute (gpm) with a specific capacity on the order of 17.4 gallons per minute per foot of drawdown (gpm/ft). Between the time of well construction and 2012, the well produced on the order of 2,200 gpm with a specific capacity of approximately 20 gpm/ft. Well rehabilitation in 2015 restored the specific capacity from 5.7 gpm/ft back to a well performance that was reported in 2018 at approximately 20 gpm/ft. In July of 2021, the well performance indicated a reduced specific capacity that was measured at approximately 7 gpm/ft. Upon removal of the old/failing pump equipment, a video survey was conducted on September 23, 2021 to assess the well’s physical condition. A copy of the well video survey report is included in Attachment A – Video Survey Summary Report. The survey indicated significant plugging from mineral precipitate and biological fouling. The work for this well rehabilitation project includes the furnishing of all materials, labor, equipment, fuel, tools, transportation, and services for the successful redevelopment, rehabilitation, and sterilization of the production well as described in these specifications. The general work required for rehabilitation of the well includes: 1. Mobilize the equipment and materials specified for cleaning the well casing, screen, gravel pack, and surrounding aquifer formation materials 2. Disassemble the surface plumbing, pump house, and roof as necessary (Note: well site requires a crane to conduct work) 3. Conduct well disinfection with a concentrated chlorine solution 4. High pressure jet the well screen interval with WellJet® (US Patent No. 8,312,930) in strict accordance with procedures described in these specifications 5. Wireline brush blank well casing to remove encrustation 6. Open end airlift fill generated from cleaning from the bottom of the well 7. Develop the well by mechanical surging with a dual-swab assembly and simultaneous airlift pumping 8. Video well to verify structural integrity and cleaning effectiveness on the well casing and screen 9. Conduct well disinfection with a concentrated chlorine mixture 10. Provide for the conveyance of development water to a discharge point as approved by the City 11. Furnish logs, daily records, and other items requested by the City of San Buenaventura **DUE DATE EXTENDED TO 11/16/21
Agency/Organization Name: City of ventura
Address: 501 Poli Street, Room 102
City: Ventura
State(s): CA
Zip Code: 93001
Plans Available: 2021-10-29
Bid Expiration: 2021-11-16
Solicitation Type: Invitation to Bid
Contact Name: Nicole Supan, Senior Buyer in the Purchasing and Contracts Division
Phone Number:
Email: nsupan@cityofventura.ca.gov
Bid Specifications and Attachments: Bid Specifications not available for past bids.

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