Groundwater quality protection :
Foster, Stephen.
Groundwater quality protection : a guide for water utilities, municipal authorities, and environment agencies / - Washington, D.C : World Bank, c2002. - vii, 103 p. :ill,
Includes bibliographical references: p. 100-103.
The focus of the current study was to evaluate whether the present regulatory limits established for biosolids pollutants (e.g., heavy metals) were sufficiently protective of human health associated with potential groundwater consumption using a new EPA risk assessment tool. Application of the RCST to two biosolids land application sites located near Columbus, Georgia predicted that, when the depth to groundwater was maintained at a distance of at least 2 m, regulated pollutant concentrations as large as ten (10) times the current regulatory limit (i.e., Title 40 of the US Code of Federal Regulations Part 503 - Ceiling Concentration Limit) could be safely land applied at rates as high as ninety (90) Megagrams per hectare (Mg ha-1) with no apparent non-carcinogenic human health effects associated with groundwater consumption. At these pollutant concentrations, the HQ ranged from 1.79 x 10-9 for cadmium to 3.03 x 10-3 for selenium. Only under unrealistically high biosolids application rates were the public health risks associated with groundwater impairment characterized as significant (HQ ≥ 1.0). For example, when the biosolids application rate was increased to 450 Megagrams per hectare (Mg ha-1) and the pollutant concentrations were increased to ten times the 40 CFR Part 503 Ceiling Concentration Limit, a HQ value of 2.23 was estimated (selenium).
0821349511 9780821349519
Groundwater.
Hydrogeology.
Groundwater quality protection policies--Rocky Mountain region.
TD426 / .G753 2002
R 628.1 / FOS
Groundwater quality protection : a guide for water utilities, municipal authorities, and environment agencies / - Washington, D.C : World Bank, c2002. - vii, 103 p. :ill,
Includes bibliographical references: p. 100-103.
The focus of the current study was to evaluate whether the present regulatory limits established for biosolids pollutants (e.g., heavy metals) were sufficiently protective of human health associated with potential groundwater consumption using a new EPA risk assessment tool. Application of the RCST to two biosolids land application sites located near Columbus, Georgia predicted that, when the depth to groundwater was maintained at a distance of at least 2 m, regulated pollutant concentrations as large as ten (10) times the current regulatory limit (i.e., Title 40 of the US Code of Federal Regulations Part 503 - Ceiling Concentration Limit) could be safely land applied at rates as high as ninety (90) Megagrams per hectare (Mg ha-1) with no apparent non-carcinogenic human health effects associated with groundwater consumption. At these pollutant concentrations, the HQ ranged from 1.79 x 10-9 for cadmium to 3.03 x 10-3 for selenium. Only under unrealistically high biosolids application rates were the public health risks associated with groundwater impairment characterized as significant (HQ ≥ 1.0). For example, when the biosolids application rate was increased to 450 Megagrams per hectare (Mg ha-1) and the pollutant concentrations were increased to ten times the 40 CFR Part 503 Ceiling Concentration Limit, a HQ value of 2.23 was estimated (selenium).
0821349511 9780821349519
Groundwater.
Hydrogeology.
Groundwater quality protection policies--Rocky Mountain region.
TD426 / .G753 2002
R 628.1 / FOS