pollutants in the environment levels below the limits. For example, the contaminated soil can be solidified and stabilized to block the migration pathway of
heavy metals and limit the leaching concentration below the environmental
quality standards for groundwater. Bioremediation of contaminated soil or
groundwater can be applied to control and reduce the concentration of organic
matters in the environment, and natural attenuation can be used to monitor the
removal of organic matter.
(3) For general sites, priority is given to the monitoring of pollution sources. The
pollution source monitoring system and groundwater quality monitoring and
early warning system should be put in place to accurately grasp the groundwater
quality trends. The risk level is adjusted according to the situation, and measures
are taken in a timely manner to eliminate or reduce the risk of pollution.
3.4 Brief Summary
This chapter describes the methods for rating and evaluating the pollution source
intensity of three typical groundwater contamination sites: HWLFs, MSWLFs, and
OCS. According to the evaluation results, the contaminated sites are classified into
three categories: priority sites, regular sites and general sites for pollution prevention and control. Further, a process-wide management strategy is proposed,
including source prevention/reduction, process control, and comprehensive management. As there are differences in the processes of pollution and in the types,
migration pathways and enrichment areas of pollutants from different sources, the
indicator system and indicator weights for pollution source intensity evaluation vary
to some extent. Based on pollution source intensity evaluation, human health risks
and groundwater pollution risks associated with these sources can be assessed.
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