What Is Groundwater Assessment?

The scope of groundwater environmental assessment is short for groundwater environmental assessment scope. It refers to the representative range selected in the groundwater environmental assessment. Evaluate the environmental pollution factors and environmental pollution conditions in the groundwater within the specified range, determine the scope of the groundwater environment, and take effective measures to reduce and prevent groundwater environmental pollution.

The scope of the groundwater environment investigation and evaluation is based on the principle that can explain the basic conditions of the groundwater environment, and should meet the requirements of environmental impact prediction and evaluation.

Groundwater environment status monitoring is mainly through dynamic monitoring of groundwater level and water quality. Understand and ascertain the current status and development trends of spatial distribution of groundwater flow and groundwater chemical components. Provide basic data for groundwater environment status assessment and environmental impact prediction.

For Class I construction projects, the groundwater level and water quality should be monitored at the same time. For class II construction projects, groundwater levels should be monitored. For Class II construction projects that may cause soil salinization, the corresponding groundwater quality indicators should also be monitored.

Principles of Current Situation Monitoring Sites

The groundwater environment status monitoring wells are laid out using a combination of controlled layout and functional layout. Monitoring well points should be mainly located at the construction project site, surrounding environmental sensitive points, groundwater pollution sources, main current environmental hydrogeological problems, and locations that have control significance for determining boundary conditions. For Class I and III reconstruction and expansion projects, when the existing monitoring wells cannot meet the requirements for the location and depth of the monitoring wells, new groundwater status monitoring wells should be deployed.

The horizons of the monitoring wells shall be dominated by diving and aquifers with development and utilization value. The diving monitoring well shall not penetrate the diving riser. The daily layer in the confined water monitoring well and the other aquifers should stop water well.

In general, the number of groundwater level monitoring points should be more than twice the number of groundwater quality monitoring points of the corresponding evaluation level.

Specific requirements for laying out groundwater quality monitoring points:

A The water quality monitoring point of the aquifer in the first-level assessment project shall be no less than 7 points / layer. When the area of the evaluation area is greater than 100km. Every additional 15 km of water quality monitoring points should be added at least 1 point, layer. Generally, the groundwater quality monitoring points on the upstream and sides of the construction project site shall not be less than 1 point / layer, and the groundwater quality monitoring points on the construction project site and its downstream affected area shall not be less than 3 points / layer.

The water quality monitoring point of the aquifer for the purpose of the second-level evaluation project shall be no less than 5 points / layer. When the area of the evaluation area is greater than 100km, at least 1 point / layer shall be added for every 20 km of additional water quality monitoring points. Generally, the groundwater quality monitoring points on the upstream and both sides of the construction project site shall not be less than 1 point / layer. The groundwater quality monitoring points of the construction project site and its downstream affected areas shall not be less than 2 points / layer.

The water quality monitoring point of the aquifer in the third-level C evaluation project shall be no less than 3 points / layer. It is generally required that the water quality monitoring point upstream of the construction project site shall not be less than 1 point / floor. The groundwater quality monitoring points of the construction project site and its downstream affected areas shall not be less than 2 points / layer ^[1] .