Intervention thresholds set for agricultural and development land
See https://www.lexology.com/library/detail.aspx?g=8009e1bc-788c-4389-9993-71b84cb72dd8
Detailed information (in Chinese) can be found at: http://www.mep.gov.cn/gkml/sthjbgw/sthjbgg/201807/t20180703_445969.htm