(I) The cleaning operation began on January 4, 2022 and, based on the statistics until December 31, 2022, the street washing operation reached 12,442.45 kilometers. The cumulative achievement rate was 100%.
(II) Estimation of the street cleaning benefits in pollution reduction:
The total length of the sweeping street in this period was 12,442.45 kilometers. According to the EPA's reduction formula (reduction amount = length of sweeping street × reduction factor), total suspended particle (TSP) can be reduced to 171.71 metric tons, 32.35 metric tons of PM10 and 7.55 metric tons of PM2.5. In addition, according to the 2022 Air Pollution Control Plan of Chiayi City, the control category of the project is classified as “fugitive emission source”, which adopts a control strategy of “Strengthening Street Dust Cleaning Operation” with the reduction planning method of “Execution Street Cleaning Operation” (including the cleaning team work of the bureau). It is scheduled to perform a total cleaning length of 73,000 km, which is expected to reduce TSP 1,007.40 metric tons, PM10 189.80 metric tons and PM2.5 44.31 metric tons. The implementation of this project long with the EPA cleaning team (until December 31 statistically) with the results of a total of 75,061.16 km of washing length, is expected to reduce TSP 1,035.84 metric tons, PM10 195.16 metric tons and PM2.5 45.56 metric tons, having reached 100% of estimated objective.
(III) Census of road fouling condition:
To strengthen the mastery and improvement of the road dirt level in Chiayi City to serve as a reference for regular planning of the street washing route, the project had conducted a comprehensive road census on Chiayi City's roads and streets washing operation every month. Road census work began in January, and a totaled 408 time/road had been surveyed by the end of September. The total number of kilometers in the census reached 951 kilometers. The results of the census accounted for more than 86.2% of Class A roads in October and 13.8% of Class B roads. The 46cases (roads) were reported to have improved.
(IV) Water Quality Analysis for Street Washing
In order to take into account the reuse of water resources, the road washing street fully takes the recycled water of the Chiayi City Water Resources Center, this year's progress and combined with the domestic sewage treatment and discharge water of the niceprince Hotel industry for road street washing, the water test result of the hotel water intake point water detection result is 4.2mg/L, which meets the water quality standard of Category D water bodies (SS standard< 100 mg/L). To avoid pollution of street washing water caused by road pollution, this scheme is equipped with a simple water quality turbidimeter, which is used for on-site testing every time water is taken every day. Turbidity test results for 2 water intake points，the turbidity of the regenerated water in the water resources center is 0NTU, and the turbidity of the hotel's recycled water is between 1.77-2.14NTU, which meets the planned water use standards.