"2018-2020 Farmland Soil Pollution Control Sites Appropriate Measures Improvement Plan (No. 3,3-2) in Taoyuan City - Taoyuan Canal 3rd and 4th Extension Canal and Other Irrigation District" was conducted by Taoyuan Department of Environmental Protection (TYDEP) on August 2018 for the continuous remediation of farmland to ensure sustainable use of land and conservation of public health. The remediation measures of this project included soil exchange method and soil dilution method to improve farmland pollution. There were total 147 farmlands, 26.0934 hectares improvement area based on the contract. After the fourth contract amendment, there were total 13 farmlands, 1.1290 hectares improvement area. The project was to confirm the concentration of heavy metal pollution below food crop farmland pollution control standard, met the farming needs and relieved from announced control list according to Soil and Groundwater Pollution Remediation Act. According to the results of the exhaustive investigation, there were 147 contaminated farmlands (26.0934 hectares) and 13 contaminated farmlands (1.1290 hectares), respectively. The pollutants of exceeding food crop farmland pollution control standard were all heavy metal copper (Cu), which were soil exchange method on 91 polluted farmlands (17.1188 hectares) and soil dilution method on 56 polluted farmlands (8.9746 hectares), respectively. In add item, there were soil exchange method on 10 polluted farmlands (1.0561 hectares) and soil dilution method on 3 polluted farmlands (0.0729 hectares), respectively. The other all of them have been improved and verified by the supervision unit within the project schedule. All areas have completed the restoration of soil fertility and obtained farmers completion agreement as well. This project has also assisted to relieve from TYDEP announced control list. This project was conducted within the content of contract and project schedule. In order to manage quality assurance, quality control and project schedule, 26 work review meetings, 27 work discussion meetings and 26 monthly reports have been held in coordination with TYDEP and the supervision unit.

Soil dilution method、Soil exchange method、heavy metal pollution、Remediation in the polluted farmlands