| 105 | Chemical tank protective wall installation and piping work | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020. 07 |
| 104 | Chango Village Sewage Treatment Plant Repair Work | Techcross Environmental Service Co., Ltd. | Chango Village | 2020.07 |
| 103 | Chemical piping installation work | Hanil Systems Co., Ltd. | Hanil Systems | 2020. 07 |
| 102 | Mechanical equipment construction | Deokyu Engineering Co., Ltd. | Deokyu Engineering Co., Ltd. | 2020. 07 |
| 101 | Diaphragm pump construction | Minseong Industry | Minseong Industry | 2020. 07 |
| 100 | Daegu Sangri food waste treatment plant improvement project | Techcross Environmental Service Co., Ltd. | Daegu Sangni | 2020. 06 |
| 99 | Chemical tank installation work | Handok C&C | Handok C&C | 2020. 06 |
| 98 | Digestion gas desulfurization machine (M-1052) repair | Techcross Environmental Service Co., Ltd. | Techcross Environmental Service Co., Ltd. | 2020.06 |
| 97 | Installation of odor treatment facility at Gunsan 1 relay pump station | Gunsan City Hall | Gunsan 1st relay pumping station | 2020. 05 |
| 96 | Installation of odor treatment facility on Munyeo Island, Gunsan | Gunsan City Hall | Munyeo Island Sewage Treatment Plant | 2020. 05 |
| 95 | Wastewater treatment facility installation work | Minseong Industry | Minseong Industry | 2020. 05 |
| 94 | Sewage treatment plant discharge pump installation | Jeonbuk Gunsan Medical Center | Jeonbuk Gunsan Medical Center | 2020. 05 |
| 93 | Piping installation work | Segi E.N.G. | SeAH Besteel | 2020. 04 |
| 92 | Filter case production and PH sensor delivery | Kangsan E&C | Korea Securit | 2020. 04 |
| 91 | Wastewater treatment facility mechanical installation work | Farmers Food Co., Ltd. | farmers food | 2020. 04 |
| 90 | Plumbing work, pump installation | Segi E.N.G. | SeAH Besteel | 2020. 03 |
| 89 | Concentration tank silt basin fine dust remover repair contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 88 | Gunsan Business Office Concentration Tank Sludge Collector Repair Contract | Techcross Environmental Service Co., Ltd. | Gunsan Sewage Treatment Plant | 2020. 03 |
| 87 | Plumbing construction | Segi E.N.G. | Korea Securit | 2020. 03 |
| 86 | Mechanical installation work (2nd phase) during structural construction (other existing facility improvement work) | Techcross Environmental Service Co., Ltd. | Daegu food processing plant | 2020. 03 |
| 85 | Diaphragm valve | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2020. 02 |
| 84 | RTO duct repair work | Iljin Steel Co., Ltd. | Iljin Steel Co., Ltd. | 2020. 02 |
| 83 | Chemical tank and pump installation work | Segi Energy Co., Ltd. | Korea Securit | 2020. 02 |
| 82 | Chemical tank piping installation | Gyeongjin Industry | Pyeongtaek Wastewater Treatment Plant | 2020. 02 |
| 81 | Autoclave piping work | Aone Construction Co., Ltd. | Aone Construction Co., Ltd. | 2020. 01 |
| 80 | Dust collector diaphragm valve replacement work | Sunil Co., Ltd. | Korea Securit | 2020. 01 |
| 79 | Mechanical installation work (1st phase) during structural construction (other existing facility improvement work) | Techcross Environmental Service Co., Ltd. | Daegu food processing plant | 2019. 12 |
| 78 | Chemical pump valve installation | Handok C&C | Daesang Bio | 2019. 12 |
| 77 | Production of odor reduction facilities | CP Co., Ltd. | CP | 2019. 12 |
| 76 | E-Land Park Jirisan Namwon micro filter installation work | E-Land Park Co., Ltd. Kensington Resort Jirisan Namwon | E-Land Park Co., Ltd. Jirisan Namwon | 2019. 12 |
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