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' 0 <br /> 4.7.3.4. Quick setting type cement, retardants to setting, <br /> Bentonite, or other additives,may be used not to <br /> exceed 5% of the volume. Hydrated lime may be <br /> ' 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 <br /> on a site-specific basis by the Director. The annular seal shall have <br /> a minimum width thickness of two (2) inches. <br /> ' 4.7.5. No repair or deepening of a well shall be done without prior <br /> approval from the Director. <br /> ' 4.7.5.1. Each well will be evaluated on a site specific basis to <br /> determine 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 <br /> adverse subsurface conditions that may destroy barriers to the <br /> vertical movement of water, thus permitting exchange of water <br /> between polluted or contaminated aquifers. <br /> . ' 4.8.2. A minimum of 12 hours of time shall be allowed between placing <br /> of the annular seal and well development. <br /> ' 4.8.3. During well development the grout seal shall be protected from <br /> erosion. <br /> ' 4.9. WELL COVER <br /> 4.9.1. After construction of the well, or before the pump is installed, or <br /> ' while repairs are being made, or if for any other reason the top of <br /> the well casing is exposed, it must be protected from foreign objects <br /> or 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 <br /> that it cannot be removed except by equipment or tools. During <br /> ' construction of the well, the well or the hole opening shall be <br /> protected at all times. <br /> 4.10. SURFACE SEAL <br /> 4.10.1. A concrete surface seal (pedestal) shall be constructed around the <br /> top of the casing on all water supply wells at the time the well is <br /> ' constructed by the licensed well contractor. <br /> E14D 43-02.003 Page 14 of 30 <br /> ' 9117/2003 <br />