P1.3.4.1 Ensure bore Inspection of Make construction follows quality. bore/well head necessary Inappropriate the NZDS with shows changes to bore/well head Chemical particular emphasis bore/well head design, or determinands on the following: with NZDS. to meet NZDS poor possible at requirements. the cement construction. shallower sanitary seal is depths (eg, watertight or is nitrate, raised 0.5 m manganese). 100-year flood level, and extends at least 3 m down the casing air vent openings are screened, facing downwards and are 0.5 m above 100 year flood level bore/well head is surrounded by a cement apron (at least 2 m in diameter) sloping away from the head. Ensure well tops are properly sealed. Ensure pumps are sealed or situated so that wastewater cannot re-enter the well. P1.3.4.2 Provide protection for Inspection of Repair bore/ the bore/well head quality. bore/well head well head. Bore/well head against stock and shows or casing Chemical Remove human damage. damaged. determinands casing and with NZDS. out regular possible at replace or visual checks for shallower repair. damage. depths (eg, nitrate, manganese). P1.3.4.3 Identify potential Construct sources of fence. Contamination contamination when sources (eg, well is being sited stock) too (see Guide S1.1). close to the bore/well Ensure that changes head. in land use (including urban developments), and the potential for contamination they create, are well monitored after construction of the bore/ well. Provide a fence around the bore/well head to keep stock at a suitable distance (at least 10 m).
P1.3.4.1 Inappropriate bore/well head design, or poor construction. Ensure bore construction follows the NZDS with particular emphasis on the following: the cement sanitary seal is watertight or is raised 0.5 m 100-year flood level, and extends at least 3 m down the casing air vent openings are screened, facing downwards and are 0.5 m above 100 year flood level bore/well head is surrounded by a cement apron (at least 2 m in diameter) sloping away from the head. Ensure well tops are properly sealed. Ensure pumps are sealed or situated so that wastewater cannot re-enter the well. quality. Chemical determinands possible at shallower depths (eg, nitrate, manganese). Inspection of bore/well head shows with NZDS. Make necessary changes to bore/well head to meet NZDS requirements. P1.3.4.2 Bore/well head or casing damaged. Provide protection for the bore/well head against stock and human damage. out regular visual checks for damage. quality. Chemical determinands possible at shallower depths (eg, nitrate, manganese). Inspection of bore/well head shows with NZDS. Repair bore/ well head. Remove casing and replace or repair. P1.3.4.3 Contamination sources (eg, stock) too close to the bore/well head. Identify potential sources of contamination when well is being sited (see Guide S1.1). Ensure that changes in land use (including urban developments), and the potential for contamination they create, are well monitored after construction of the bore/ well. Provide a fence around the bore/well head to keep stock at a suitable distance (at least 10 m). Construct fence.
treatment-bores-and-wells-feb14-v2.docx