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4.7.3.4. Quick setting type cement, retardants to setting, Bentonite, or <br /> other additives, may be used not to exceed 5% of the volume. <br /> Hydrated lime may be used up to 10% of the volume. <br /> 4.7.4. In grouting the annular space, the grout shall be applied in one <br /> continuous process. Deviations from this process may be approved on a <br /> site-specific basis by the Director. The annular seal shall have a <br /> minimum width thickness of two (2) inches. <br /> 4.7.5. No repair or deepening of a well shall be done without prior approval from <br /> the Director. <br /> 4.7.5.1. Each well will be evaluated on a site specific basis to determine <br /> the feasibility of the work desired. <br /> 4.8. WELL DEVELOPMENT <br /> 4.8.1. Developing, re-developing or reconditioning of a well shall be <br /> accomplished by a method that will not cause damage to the ground <br /> water aquifer. Care shall be exercised to prevent occurrence of adverse <br /> subsurface conditions that may destroy barriers to the vertical movement <br /> of water, thus permitting exchange of water between polluted or <br /> contaminated aquifers. <br /> 4.8.2. A minimum of 12 hours of time shall be allowed between placing of the <br /> annular seal and well development. <br /> 4.8.3. During well development the grout seal shall be protected from erosion. <br /> 4.9. WELL COVER <br /> 4.9.1. After construction of the well, or before the pump is installed, or while <br /> repairs are being made, or if for any other reason the top of the well <br /> casing is exposed, it must be protected from foreign objects or <br /> contamination entering the well by use of a seal or cover. <br /> 4.9.2. The cover shall be watertight and held in place in such a manner that it <br /> cannot be removed except by equipment or tools. During construction of <br /> the well, the well or the hole opening shall be protected at all times. <br /> 4.10. SURFACE SEAL <br /> 4.10.1. A concrete surface seal (pedestal) shall be constructed around the top of <br /> the casing on all water supply wells at the time the well is constructed by <br /> the licensed well contractor. <br /> EHD 43-03 Page 13 of 27 WELL STANDARDS <br /> 10/9/07 <br />