Specifications include, but are not limited to: The Contractor shall redevelop the well through a combination of individual chemical treatments, mechanical surging, high volume backwashing and pumping. The development equipment to be used MUST include a minimum of three (3) full diameter blocks (two in the screen and one in the casing), an end-suction turbine pump, a calibrated orifice for the measurement of the flow rate and a minimum 1,500-gallon temporary holding tank to be used for the storage and neutralization of the redevelopment chemicals. The well will be redeveloped and chemically treated as follows: 1st Treatment – Once the pumping equipment has been removed, and the pre-cleaning video inspection completed, the Contractor shall pre-treat the well by jetting the interior of the screen with a high-pressure stream of water to remove soft materials and break apart hardened mineral deposits from the screen surface. The jetting tool is to be set within the well along with either a submersible or centrifugal pump. Once set, the jetting tool will be raised and lowered through the well screen covering the entire length of screen on each pass. Throughout the jetting process, the submersible/centrifugal pump will be used to pump debris loosened out of the well. Wastewater pumped from the well will be directed to a temporary holding tank, where the solids will be allowed to settle out prior to discharge of the water on-site at a location acceptable to the Owner. In addition, a pre-treatment shall be performed by scraping the interior of the well screen using a nylon brush to physically break down the scale deposits prior to the chemical treatments. 2nd Treatment – Upon removal of the jetting equipment, the surge-block development tools will be set, and prior to the placement of any chemicals the well will be surged for a period of one (1) hour and then pumped to waste to remove any loose debris from the interior of the screen and casing. The Contractor will place in the well screen a solution consisting of 20 degree baume Muriatic Acid and NuWell 310 Bio-Acid Enhancer. A sufficient amount of acid shall be placed in the well to provide an acid concentration in the entire screen and gravel pack of 15%. The NuWell 310 shall be added at a rate of 2.5 gallons per 55 gallons of acid. Once the solution has been placed in the well it shall be forced into the formation by the addition of 1,500 gallons of potable water. The Acid/NW310 solution shall then be surged, pumped and backwashed for a minimum of 4 hours.
