**6. Investigations for groundwater organic pollution**

#### **6.1. Current situation investigation**

The current situation investigation main contents are as following:

Pollution source investigation: In groundwater polluted areas, investigate the non-pointsource, line-source and point-source, and the type, pollution intensity, spatial distribution of natural source.

Investigation of unsaturated zone vulnerability: Investigate the unsaturated zone of thick‐ ness, lithological composition, composition, water permeability, the capability of degrada‐ tion contaminations and so on.

Investigation of the pollution condition at the groundwater: Make sure the category, quanti‐ ty or concentration of the pollutants, ascertain the pollution range, variation trend and the factors relation. All of these need samples collection in filed and laboratory test.

#### **6.2. Pollution source investigation**

With the developed, groundwater pollution attracted wide attention. In view of existing sit‐ uation, we launched the survey of pollution sources, including the following aspects: indus‐ trial pollution sources, domestic pollution sources, agricultural pollution sources and surface polluted waters.

#### *6.2.1. Industrial pollution sources*

According to industrial pollution sources, we must investigate the situation as: the company name, position, sewage, waste residue (tailings) emissions, discharge, scale, pathways and outfall location, types of pollutants, quantity, composition and hazards, and the abandoned site of major polluting enterprises, abandoned wells, oil and survey of solvents and other underground storage facilities.

#### *6.2.2. Domestic pollution sources*

The survey include the distribution of dumps, scale, waste disposal methods and effects, the generation of dump leaching filtrate and components, geological structure of storage site; amount of sewage generated, treatment and disposal of the way, main pollutants and their concentration and hazards

#### *6.2.3. Agricultural pollution sources*

mine if, how fast, and at what concentration a chemical reaches a supply well. A great deal of research has been carried out on understanding and modeling these processes. There is increasing recognition that chemical transport must be viewed as a stochastic process.

The same elements of uncertainty are present for saturated transport as for unsaturated transport. The important differences are that in saturated transport, water content equals porosity, hydraulic conductivity is no longer a function of water content or head, gravity rather than suction head is the driving force, and the scale of concern may be much larger

Pollution source investigation: In groundwater polluted areas, investigate the non-pointsource, line-source and point-source, and the type, pollution intensity, spatial distribution of

Investigation of unsaturated zone vulnerability: Investigate the unsaturated zone of thick‐ ness, lithological composition, composition, water permeability, the capability of degrada‐

Investigation of the pollution condition at the groundwater: Make sure the category, quanti‐ ty or concentration of the pollutants, ascertain the pollution range, variation trend and the

With the developed, groundwater pollution attracted wide attention. In view of existing sit‐ uation, we launched the survey of pollution sources, including the following aspects: indus‐ trial pollution sources, domestic pollution sources, agricultural pollution sources and

According to industrial pollution sources, we must investigate the situation as: the company name, position, sewage, waste residue (tailings) emissions, discharge, scale, pathways and outfall location, types of pollutants, quantity, composition and hazards, and the abandoned site of major polluting enterprises, abandoned wells, oil and survey of solvents and other

The survey include the distribution of dumps, scale, waste disposal methods and effects, the generation of dump leaching filtrate and components, geological structure of storage site;

factors relation. All of these need samples collection in filed and laboratory test.

**6. Investigations for groundwater organic pollution**

The current situation investigation main contents are as following:

**6.1. Current situation investigation**

98 Organic Pollutants - Monitoring, Risk and Treatment

tion contaminations and so on.

**6.2. Pollution source investigation**

surface polluted waters.

*6.2.1. Industrial pollution sources*

underground storage facilities.

*6.2.2. Domestic pollution sources*

natural source.

Agricultural pollution sources investigation mainly include land use history and current sit‐ uation, the varieties, numbers, operations, time of farmland application of chemical fertiliz‐ ers and pesticides, range of sewage irrigation, main pollutants and concentration, the number of sewage irrigation and sewage irrigation amount. The scale of farms and so on.

#### *6.2.4. Surface polluted waters*

The surface polluted waters mainly about rivers, lakes, ponds, reservoirs and drains. We survey the distribution of polluted waters, the scales, the utilizations and water quality.

The coastal areas have to survey the situation of seawater invasion and saline water distri‐ bution.
