Going yet further back, standards can be set at a number of points in the pathway through the environment. One Directive sets a quality standard for surface water from which drinking water is to be abstracted (see Section 4.3). If the constituents of river water, including lead, exceed a given concentration, then that point in the river must either not be used at all for abstracting drinking water or the treatment given to it must be of a specified kind. Other environmental quality standards for water have been set by Directives, including ones for bathing water (Section 4.5) and water supporting freshwater fish and shellfish (Sections 4.10 and 4.11) and although these could have included standards for lead they have not done so. In the case of the freshwater fish and shellfish Directives, the targets could have been regarded as either the fish and shellfish themselves or the humans that consume them, although it emerges that the Directives are not intended primarily to protect man. The Directive on air quality standards for lead (Section 6.6 and 6.19), classed above as an exposure standard, can also be classed as an environmental quality standard. Another Directive sets limits on the application of sewage sludge to agricultural land when the concentration of certain metals, including lead, in the soil exceeds certain limits (see Section 5.9).