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i 4. The casings shall be suspended above the bottom of the hole at a sufficient distance to ensure that none of the casing will be supported from the bottom. i D. MEASUREMENT AND PAYMENT: Full compensation for conforming to these requirements, including all the labor, materials, tools, equipment, incidentals, and for doing all the work involved in drilling and installing the casing, as specified in the Standard Specifications, these special provisions, — and as directed by the Engineer, shall be considered as included in the prices paid for the various contract items of work involved and no additional compensation wilt be allowed. J 3.09 GRAVEL PACK PLACEMENT . A. General: Gravel placement procedures shall be appropriate to the reverse rotary drilling method. Gravel shall be placed in a manner that will prevent segregation and will fill the annular space completely. Gravel shall be disinfected in accordance with AVWVA A100— Section 4.9. 1. A tremie pipe or tube shall be used to place gravel. It shall be of sufficient length to reach the bottom of the gravel pack location and it should be easily maneuverable to allow raising to match the gravel level as gravel is placed. Rate of adding gravel to the well shall not exceed a vertical rise of 1-112 feet per minute. 2. During placement of the gravel in the annular space, calcium hypochlorite in tablet or granular form shall be added to the gravel at a uniform rate of two tablets per cubic foot of gravel or one pound of granular form per cubic yard of gravel. Other methods of gravel disinfection must be approved by the Engineer. 3. Before the gravel packing operation begins, the Contractor shall make adequate preparations to ensure that circulation in the well will be continuous. The Contractor will not be allowed to stop circulation from 1 the time that gravel placement begins until the time when the gravel r pack is completely in place. The Contractor shall also make adequate `-' areparation in terms of gravel stockpile and gravel handling equipment to ensure uninterrupted feed. After the gravel is in place, circulation and water jetting shall continue in stages until gravel is consolidated and cleared. 4. A careful record shall be kept of the amount of gravel added during placement and consolidation. The total quantity of gravel placed in the . annular space during placement and development shall be at least as great as the calculated volume of the annular space. B. MEASUREMENT AND PAYMENT: Full compensation for conforming to these requirements, including all the labor, materials, tools, equipment, ;d T incidentals, and for doing all the work involved in gravel pack placement, as N3N specified in the Standard Specifications, these special provisions, and as directed by the Engineer, shall be considered as included in the prices paid id {)0 VC Division III-24 E VA