Soil Monitoring Network

Total 21 criteria (8 heavy metals, 11 ordinary metals, and pH) are checked in 1,521 Soil Monitoring Networks nationwide to figure out the status of soil contamination and contamination trend and reflect the resulting data in the establishment of soil conservation policy including soil contamination prevention. As for the change in annual average contamination level with five heavy metals including cadmium, with the change to total content testing method (on January 1, 2010), the concentration increased in 2010-2011 as compared to 2007-2009, but below 30% of the level causing concern (area 1). As for mercury, zinc, nickel, fluorine, and cyan, the concentration remains at similar levels year on year out and TPH is on the rise year after year in housing land, industrial land, road site, and railroad site, but 2011 contamination level was 7.4% of the level causing concern (area 1).

 Monitoring Results of Soil Quality by Soil Monitoring Network

Source : Monitoring Results of Soil Quality by Soil Monitoring Network (2007-2011)

※ The amendment of the subordinate statutes of Soil Environment Conservation Act (June 2009) specified regional criteria based on land use level (Area A, B & C ⟶ Area 1, 2 & 3). Also, as for five heavy metals of Cd, Cu, As, Pb, Cr (VI), the category changed from elution to total content, while BTEX further ramified into benzene, toluene, ethylbenzene, and xylene.

Groundwater Quality Measuring Network

To regularly figure out the status of groundwater contamination and the trend in water quality nationwide with a view to using the resulting data in the establishment of policy for conserving groundwater quality, Groundwater Quality Monitoring Network was installed and operated to conduct an investigation in 20 criteria (5 general pollutants and 15 specific hazardous substances). Groundwater Quality Monitoring Network was divided into National Monitoring Network and Local Monitoring Network in 2008; the former is operated by the Ministry of Environment, the Ministry of Land, Infrastructure and Transport, and the Ministry of Agriculture, Food and Rural Affairs, while the latter is operated by cities and provinces (including local Environmental Agencies) (Table 4-2). 
 

 The results of operation of Network Dedicated to Monitoring Groundwater Quality in 2011 show that 392 (8.0%) of total 4,879 survey samples turned out to fall below the water quality standards. By pollutants, about 70% of the samples were surveyed as exceeding the standards in quality criteria for general pollutants. General pollutants came in the order of total coliforms (48.6%), nitrate nitrogen (11.2%), and chloride ion (11.2%), and the principal cause is presumed to be tube wells or poorly managed hygiene. Besides, trichloroethylene (TCE, 9.0%) and tetrachloroethylene (PCE, 2.6%), used as detergents for textiles and metals, were found to exceed standards in industrial complexes and urban residential areas.
According to the results of operation of monitoring network in general areas in 2011, average excess rate was reported to be 2.4%. By area, excess rate showed highest with 6.4% in Gangwon Province, with the rate appearing higher than average in Seoul (4.7%), Chungnam Province (3.6%), and Busan (3.1%). 

 Results of Operation of Groundwater Quality Measuring Network

Source: Monitoring Results of Groundwater Quality by Groundwater Quality Monitoring Network (2007-2011)

※ Since one sample showed excess in two or more criteria, the number of excesses and the criteria with excess differed.
※ With the change in the criteria for groundwater quality standards (enforced on February 16, 2010), Coliform groups and Total colony count were removed while Total coliforms was included. Total coliforms for 2007-2009 was indicated in Total coliforms.

 Status of Excess Rates for Pollutants

 


Last modified : 2013-10-29 20:18

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