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2. Where the pump is offset from the well or where a submersible pump is used, the opening between the well casing and any pipes or cables which enter the well shall be closed by a watertight seal or "well cap". 3. If the pump is not installed immediately or if there is a prolonged interruption in construction of the well, a watertight cover shall be installed at the top of the casing. SCREENED AND INVERTED AIR RELEASE VACUUM FROM SLAB.BREAKER VENT, 3FT.MINfNUM 4. A watertight seal or gasket shall be placed SCREENED AND INVERTED CASING � between the pump discharge head and the discharge line; or, YENT. 3IN.11. MINIMUM DIAMETER in the event of a below-ground discharge, between the NO THREADED HOSE BIBS discharge pipe and discharge line (see Figures 6 and 7). BETWEEN PUMP AND MOTOR CHECK VALVE, 5. If a concrete base Or slab (sometimes SITE FOR SAMPLING TAP called a pump block or pump pedestal) is constructed around OR CHLORINATION the top of the casing, it shall be free from cracks, honey- combs or other defects likely to detract from its watertight- ness. The joint between the base and the annular seal must PUMP HEAD also be watertight. The base shall slope away from the well ® casing. The minimum thickness of the concrete base shall be sauNDIMG TUBE 4 inches (100 millimetres).f AIRLINE _ / 6. Where the well is to be .gravel packed and SOURDING TUBE GRAVEL FILL PIPE the pack extends to the surface, a watertight cover shall be F. ALL VENT PIPES MUST installed between the conductor casing and the inner casing i ! W, BE OINT OF ENTRY OENYSEALER POINT (see also Section 9, Part B, Item 5 and Figure 5). :'.•;• ...•.• II . INTO WELL. B. Well Pits. Because of their susceptability. to f ;i MPERVlOUS SURFACE sUR- contamination and pollution, the use of well pits should be , - ROUNDING WELL SLOPED I avoided whenever possible. A substitute device called a U AWAY FROM WELL• C� pitless adapter?/ or pitless adapter unit (a variation) may be used in place of a well pit. n C. Enclosure of Well and Appurtenances. In STEEL REBAR community water..supply wells, the well and pumps all be located in a locked enclosure to exclude access by PUMP PEDESTAL OF MO%OLITHIC4 unauthorized persons. ALLY POURED CONCRETE IS IN. ABOVE FINISHED GRADE. - 1 This value is for small (under 10 inches or 250 millimetres -GRAVEL PACK in diameter) individual domestic well installations. The GROUT SEAL, shape and dimensions of pump bases varies with the size, 2IN.MINIMUM THICKNESS weight and type of pumping equipment to be installed and SOFT.MINIMUM DEPTH. � the bearing capacity of the soil on which it is situated. A variety of designs have been used. For large diameter RCONDUCTOR CASING turbine pump installations the Vertical Turbine Pump LINE SHAFT rINNER CASING Association has developed a standard design for a square, PUMP COLUMN concrete pump base that is based on weight, including full pump column and soil bearing capacity. (See Bibliography, Appendix E.) Pitless adaptors and uni.ts.were developed for use in areas where prolonged freezing occurs and below ground (below frost line) discharges are common. Both the National Sanitation Foundation and Water Systems Council have Figure 7. SURFACE CONSTRUCTION FEATURES developed standards for their manufacture and installation. 1 COMMUNITY WATER SUPPLY WELL l (See Bibliography, Appendix E.)