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2. Before sealing commences a packer or <br /> similar retaining device or a small quantity of sealant may <br /> be placed and permitted to set at the bottom of the interval <br /> to be sealed to form a foundation for the seal. <br /> 3. The sealing material shall be applied, when cmw��ursL2 <br /> possible, in one continuous operation from the bottom of the <br /> interval to be sealed to the top. Where the seal is to be DRDFPIPE <br /> very deep (i.e., greater than 100 feet or 30 metres) a short MOTOR <br /> ACa;S kLtl9 SptT <br /> segment at least 10 feet (3 metres) in length may be installed GASKET CTNNEADEDi <br /> first, allowed to "set" or partially "set" and then the SOUNDING TwE { <br /> remainder of the seal placed in one continuous operation. (SCREW CAP) II PUMP OISCHARiE PIPE SAUEr YELL CIF <br /> 11 HEAD <br /> 4.- Gravity installation of sealant without the GASKET <br /> aid of a tremie or grout pipe shall not be used unless the <br /> interval to be sealed is dry and in no case where the :� �::.• , •.; ,•.,,.e,::.n,::; DAS�N< <br /> interval is over 30 feet (9 metres) in depth. <br /> CONCRETE <br /> Section 10. Surface Construction Features. USE <br /> a <br /> A. Openings. Openings into the top of the well CASING R SMUT ' ��N KITH <br /> which are designed to provide access to the well, i.e., for <br /> measuring, chlorinating, adding gravel, etc., shall be = } <br /> protected against entrance of surface waters or foreign k <br /> matter by installation of watertight caps or plugs. Access <br /> openings designed to permit the entrance or egress of air or <br /> gas (air or casing vents) shall terminate above the ground TURBINE PUMP INSTALLATION SUBERSI$LI: PULP INSTALLATION <br /> and above known flood levels and shall be protected against <br /> the entrance of foreign material by installation of down- <br /> turned and screened "U" bends (see Figures 6 and 7). <br /> All other openings (holes, crevices, cracks, etc.) <br /> shall be sealed. <br /> A "sound�' tube",� taphole with plug, or similar ACCESS PLUG ACCESS PLUG CAP <br /> access (see Figure 6) for the introduction of water level (THREADED) MOLT [TAPPED HOLE) <br /> measuring devices shall be affixed to the casing of all _ SLOPED <br /> wells. For wells fitted with a "well cap" the cap shall have t°'='A :i`, : .¢:; •:p <br /> WELL CAP <br /> G ASK E T- <br /> a removable-plug for this purpose. CONCRETE RASE a <br /> 1. Where the pump is installed directly over CONCRETE GROUT m: <br /> the casing, a watertight seal (gasket) shall be placed SASE c: WATER TIGHT sEAt <br /> between the pump head and the pump base (slab), or a water- ■{ �,- -q ''o:;■_. A• <br /> tight seal (gasket) shall be placed between the pump base and '::s.`:'.4: 4 _t•;; <br /> 9' <br /> the rim of the casing, .or a "well cap" shall be installed to <br /> close the annular opening between the casing and the pump ;V <br /> �' 9R4L1 <br /> column pipe (see Figures 6 and 7). #: DROP PIPE CASING <br /> DROP PIPES CAEINS <br /> '► <br /> A "sounding tube" or similar access is necessary so that _ <br /> the water level in the well can be periodically determined. <br /> Knowledge of the water level, both static and pumping <br /> levels, is vital to the maintenance of the well and pump JET PUMP INSTALLATION BELOW GROUND DISCHARGE <br /> and for determining the efficiency of pump. Such informa- <br /> tion will lead to few and less costly repairs and reduce <br /> operating costs. <br /> Figure 6. TYPICAL SURFACE CONSTRUCTION FEATURES <br />