Phase I: Wire Brushing of the Well The contractor shall wire brush and scrape the well for a period of not less than 15 min per 20-foot interval. The wires should maintain a touch fit to the inside diameter and be capable of rotating while being raised and lowered. After brushing is complete, the Contractor shall remove all debris from the well bottom by airlifting or bailing. The waste shall be neutralized by the Contractor to a pH greater than 6.5 and less than 8.5 and disposed of by the Contractor in accordance with current Environmental Regulations. Phase II: Chemical Treatment A chemical treatment will be used for the redevelopment of the North Santee Well. The owner will provide chemical solutions for the redevelopment of the well. The mixed solution should be introduced into the casing through a double-block swab/brush into screens and formation. After the chemicals are added, an aggressive surging shall be used to break down any particulate and/or build-up. The Contractor will swab the entire casing with a minimum 20' double surge block from the bottom of the well to the standing water level. Each 20' section of casing will be swabbed for 15 minutes and each 10' screen shall be swabbed for 30 minutes. The solution shall stand for a minimum of 12 hours after surging. The Contractor shall agitate treatment before removing from the well. The chemical solution shall be neutralized to 6.5 to 8.5 pH before disposal by the Contractor, according to the current Environmental Standards. Phase III: Disinfection The Contractor shall furnish labor, equipment, material, and services to "super chlorinate" North Santee Well Owner will supply Sodium Hypochlorite and NW-410 to “super chlorinate” the well. Contractor shall prepare a 300 mg/L residual chlorine solution. The Contractor shall use an appropriately sized polyethylene tank to mix the chemicals. Contractor shall inject the mixed solution through a snug-fitting double surge block. A quantity of 300 gallons of mixed solution shall be injected per 20'interval of well screen and swabbed into place. After 24 hours, the chlorine treatment shall be agitated, removed, and neutralized before disposal. Disposal by the Contractor shall meet current Environmental Specifications. After disinfection, the contractor shall remove material from the bottom of the well, televise, and chlorinate the well. Phase IV: Replacement of pump and motor The contractor shall provide a replacement pump, motor, and 40-foot section of a 4-inch pump column for this project. Phase V: Well Casing Repair At approximately 174.25ft, there seems to be a possible hole in the pump column or well casing. The Contractor shall provide pricing for the well casing repair. A. A well casing repair sleeve shall be used to repair the potential hole at 174.25’ down the well casing. B. The casing repair sleeve shall be inserted with monitoring by a CCTV to be sure that it is properly located. C. Contractor shall use a High-Pressure repair sleeve for Potable Water.
