WORK PLANS - Laserfiche WebLink

Home Browse Search

2 feet laterally in all directions from the outside of the well boring,unless otherwise approved by the enforcing agency. The base shall be free of cracks, voids, and other significant defects likely to prevent water tightness. Contacts between the base and the annular seal, and the base and the well casing must be water tight and must not cause the failure of the well casing or annular seal. Where cement-based annular sealing material is used,the concrete base shall be poured before the annular seal has set, unless otherwise approved by the enforcing agency. E. Vaults. At the approval of the enforcing agency, the top of a cathodic protection well may be below ground surface because of traffic or other critical considerations. A watertight, structurally-sound vault, or equivalent feature, shall be installed to house the top of the well casing if it terminates below ground surface. The vault shall extend from the top of the annular seal to at least ground surface. In no case shall the top of the annular seal be more than 4 feet below ground surface. The vault shall contact the annular seal in a manner to form a watertight and structurally- sound connection. Contacts between the vault and the annular seal,and the vault and the well casing (if any), shall not fail, or cause the failure of the well casing or annular seal. Where cement-based annular sealing materials are used, the vault shall be set into or contact the annular sealing material before it sets, unless otherwise approved by the enforcing agency. If bentonite-based sealing material is used for the annular seal,the vault shall be set into the bentonite before it is fully hydrated. Cement-based sealing material shall be placed between the outer walls of the vault and the excavation into which it is placed to form a proper,structurally sound foundation for the vault, and to seal the space between the vault and excavation. Sealing material surrounding the vault shall extend from the top of the annular seal to ground surface,unless precluded in areas of freezing. If cement-based sealing material is used for both the annular seal and the space between the excavation and vault,the sealing material shall be emplaced in a"continuous pour." In other words,cement-based sealing material shall be placed between the vault and excavation and contact a cement-based annular seal before the annular seal has set. The vault cover or lid shall be watertight but shall allow the venting of gases. The lid shall be fitted with a security device to prevent unauthorized access and shall be clearly and permanently labeled "CATHODIC PROTECTION WELL." The vault and its lid shall be strong enough to support vehicular traffic where such traffic might occur. The top of the vault shall be set at grade, or above, so that drainage is away from the vault. The top of the casing contained within the vault shall be capped in accordance with requirements of Subsection B,above so that water,contaminants,and pollutants that may enter the vault will not enter the well casing. F. Protection From Vehicles. Protective steel posts,or the equivalent,shall be installed around a cathodic protection well casing where it is terminated above ground surface in areas of vehicular traffic. The posts shall be easily seen and shall protect the well from vehicular impact. -68-