The Well #7 Replacement Project will consist of constructing a new deep well. Currently, City wells yield water from shallow zones, starting at approximately 200? below ground surface. The replacement well will target deeper zones in the 400? to 900? range. Since there is a confining clay zone between 300? and 370?, surface contaminants will be reduced or eliminated. Construction of the deep well will ensure the City of Hughson has a long-term, reliable water supply that is not susceptible to surface contaminants. Since all existing City production wells are shallow, this project is vital to the City water supply program. Time is the essence as other wells could soon be lost to nitrate contamination, so constructing a replacement well is urgent. The project consists of (1) drilling a 900? exploratory well to identify deep water bearing zones and associated water quality (ensure exclusion of nitrates), and (2) constructing a deep well based on the exploratory well findings, and (3) site/mechanical improvements, as described below: (1) Exploratory Well: Like most municipal well projects, an exploratory well is required prior to production well construction. The exploratory well will be a special ?casing hammer? type well so accurate water quality samples can be obtained. This process will confirm that nitrates have not migrated below the confining clays and that other water quality parameters are acceptable. The exploratory well work is scheduled to proceed in August, 2012. Estimated construction cost: $100K.(2) Production Well: Using data from the exploratory well, construct a new deep production well. The well will consist of a 16? steel casing, shutter screen perforations at select water bearing zones, and 6? annular gravel envelop. At completion, the well will be developed and test pumped to design facility mechanical/electrical. Production well is scheduled for October, 2012. Estimated construction cost: $340K.(3) Site Improvements: Equip the deep well with pump/motor, mechanical appurtenances, electrical, hydro-pneumatic tank, building, access, etc. Site improvements are scheduled for Spring, 2013. Estimated construction cost: $725K.
City of Hughson
The project will solve the City health risk related to Arsenic MCL violation
Project Benefits a Disadvantaged Community (or SDAC):