Located at the original Shueinan Airport, the Taichung Gateway Park had been found, after the investigation by the Environmental Protection Administration, ROC (Taiwan) and the Environmental Protection Bureau (EPB) of Taichung City Government, to have two contaminated areas: A part of soil under the maintenance factory and the restaurant was contaminated by the insulating oil of the broken transformer box and the Armaments Bureau was responsible for the soil improvement tasks. The other part of soil under the electroplating plant and the waste water treatment plant and on the open space at the northern side of Fire Squad was contaminated by heavy metals and the Air Force Command Headquarters of Ministry of National Defense was responsible for improving this portion of soil.
The Armaments Bureau completed the improvement of oil-polluted soil in December 2012. After excavation and screening, the soil detected over the pollution control standards was removed to and incinerated at the soil treatment plant. The de-contaminated soil was then sintered into ceramic and used as a lightweight construction material. The excavated area was back filled by non-polluted soil purchased from outside. All the related improvement tasks were verified by the EPB to meet the improvement goals and thus the Armaments Bureau has been dismissed of its responsibility since March 2013.
With regard to the soil contaminated by heavy metals, the EPB publicized the polluted site on February 9, 2012. The Air Force Command Headquarters was requested to submit its pollution control plan, which was reviewed and approved by the EPB in no time and then contracted out for execution right away. The polluted soil was processed by screening, acid pickling, flipping, mixing, and diluting with the clean soil taken from within the site, and then back filled into the excavation area. No contaminated soil was transported and handled outside and no secondary pollution was caused. The Air Force Command Headquarters verified the improvement results by itself first to make sure that heavy metal concentrations were really below the soil pollution monitoring standards and then submitted the remediation report on April 30, 2013. The report was reviewed and approved by Taichung Soil and Groundwater Remediation Team. Then, the EPB double checked it by taking samples from the site. All the samples showed that the concentrations of heavy metals were really lower than the pollution monitoring standards, confirming that all improvement targets were reached. Thus, the sites has been released of control since July 22, 2013 according to Article 26 of the Soil and Groundwater Pollution Remediation Act. The case has been also consented for future reference by Environmental Protection Administration, ROC (Taiwan) since July 29, 2013.
The polluted area at Taichung Gateway Park was about 0.76 hectares and it caused every much concern from all walks of life. Taichung City Council once sent a delegation to Taichung Gateway Park to investigate the improvement project and demanded the EPB to strictly supervise the operations. The EPB did dispatch its personnel to station at the sites. Under its strict supervision, no polluted soil was ever transported and handled outside. Every piece of waste was treated in accordance with the Waste Disposal Act. Waste water generated by acid pickling operations was properly handled. All the water quality tests by the EPB complied with standards. No secondary pollution was caused. Soil improvement tasks were successfully completed. The land has now restored to its original function for sustainable use.