Current status of water environment, impact assessment and mitigation measures

14.5.2 Impact on the water environment during construction period and mitigation measure

Impact upon Beigang during construction of Kuiqi Bridge: The effluent from the construction area will be subjected to sedimentation and oil-separation treatment before discharge, which will bring little impact on Beigang. Similarly, SS has little environmental impact on Beigang as well. However, the petroleum will cause certain influence around the discharge outlet. Basically, the “Water Quality Standard for Fisheries” can be met at 130m downstream of the discharge outlet; effluent from construction of the bridge piers will cause considerable impact upon SS in the water environment. However, as the pile foundation is constructed in a cofferdam, the impact therefrom would be transient.

Impact upon inland rivers by construction of the Nanjiang Binlu and the Phase-II Project of the Third Ring Road : Construction wastewater includes slurry from digging and drilling activities, cooling and washing water from machinery and equipment, and oil-bearing wastewater from construction equipment operation or maintenance/service. Unless treated before discharge, these kinds of wastewater will have impact on receiving waters; Because Nanjiang Binlu is going to be constructed within the flood-preventing dam, the living wastewater from local residents, as that from the construction personnel, enters the urban drainage system and the living garbage is collected by the environmental protection station for treatment; The 3^rd Ring (Phase II) is also going to be constructed within the flood-preventing dam, but there are no urban underground drainage systems along the route, so measures shall be taken to prevent pollution by living wastewater and living garbage.

Ground water washes the loose soil, construction-used gravel and sand, garbage, abandoned soil, etc, and carries a lot of soil and sand into the Minjiang River and may block the river bed and water pipes.

1) During road construction period, there are quantity of slurries and oils included in the construction wastewater, which shall be basically treated before being discharged into the city pipeline network. Direct discharge into the Minjiang River and inland rivers is strictly prohibited.

2) During construction period, it is strictly prohibited to dump the residuals from excavation directly into rivers adjacent, so that the pollution to the water area will be minimized. Thereinto, for bored waste slug, it can be backfilled in a reclamation dam (above the maximum water level) upon approval of the water conservancy authority, or it shall be handed over to the environmental department for disposal.

3) Residual oil and waste oil during the bridge construction period shall be recycled and stored in different containers generally as per mixture situations of them. Oil-bearing wastewater comes from the relevant operation and from the cabin of boat for construction purpose, for which, the mechanical centrifugal oil-water separator shall be adopted for filtration and treatment.

4) The construction unit shall also treat roughly the slurry water for filtration and sedimentation. Direct discharge of slurry water into Minjiang River and inland rivers is prohibited. The construction unit shall strengthen it management for civilized construction, with rainwater guild canal and filtration & sedimentation tank provided within the construction range at both banks.

5) For the safety of flood-prevention and for protection of the living and production of the people, it is strictly prohibited to excavate the flood-prevention dam and embankment during the construction period.

6) If the waste from excavation is freely dumped and placed, it may cause water loss and soil erosion in case of storm. If it enters into the city drainage system and inland rivers, it may block the drain ditch after settlement while the slurry water discharged directly into the inland rivers will lead an increase of the sand content of the water in the river and cause deposit on the river bed. In addition, the slurry water is also mixed with other pollutions like the cement and oil etc. on the construction site, which will cause pollution to the waterbody.

14.5.3 Impact upon the water environment during the operation period and the mitigation measures

The forecast shows that, because the concentrations of COD_cr, oil, and SS in the bridge deck rainwater are low and the flow rate at Kuiqi section of Minjiang Beigang is high, so the bridge deck rainwater has a limited impact on the water quality of Minjiang River.

During the operation period, the impact of road surface source pollution on the water is small. Obvious pollution often comes from vehicles carrying hazardous goods. Experiences show that the probability of accidents on the bridge that lead to water pollution is very low. However, in order to prevent pollution, corresponding measures shall also be ready in place. During the construction period, rainflow on the bridge deck shall not be directly discharged into the river. It shall be guided into the dike. In addition，buffering cells shall be built at the point of discharge, namely at the both ends of Kuiqi Bridge, so that when pollutants are leaked, they can be guided into the cells for treatment. Surveying and comparison shows that, at the worst, two 5T vehicles might collide with each other and cause leakage of 10T toxic substances, so one 10-m³ buffering cells shall be built at each end of the bridge.

14.6 Impact upon the cultural property and the protection measures

14.6.1 Analysis on impact upon the cultural property by the “Two Roads & One Bridge” project

Along both sides of the Nanjiang Binlu, there are two cultural property in Jiancheng District, i.e., the An’lan Guild Hall and the Fanchuanpu Catholic Church; from start of the Phase-II Project of the Third Ring Road , there are five cultural property in Jiancheng District, i.e., the Former Residence of Yan Fu and Pushan Temple in Gaishan Town, Lingshan Temple in Luozhou Town, Lianjiang School and (South Song Dynasty) Emperor’s Xanadu in Chengmen Town; at northwest of the flyover by south of the Kuiqi Bridge, there are two cultural property in Jiancheng District, i.e., the Linpu Cannon Turret and the Linpu Stone Tower.

Subjected to the analysis, construction of the Nanjiang Binlu will influence Fanpuchuan Catholic Church the most and has little or no impact on the other eight sites.

14.7 Public participation

Tow methods as visit and meeting are adopted to collect opinions from the mass and relevant units. The key range for public participation covers the people affected along the routes and the urban area where the road is to be constructed. The urban residents and related government officials at various levels are visited and interviewed; for villagers committee and the township government in the countryside, the villagers affected and related government officials at various levels are visited and interviewed.

1) Most of the interviewees support construction of the roads and the bridge.

2) Issues put forward by the interviewees and proposed to take into consideration during planning and design of the road include:

① It is suggested to avoid the historic sites, swamped land and ancient trees during planning; It is suggested to consider multiple proposals for design of the line across the Fanchuanpu Church, including adoption of bridge to prevent the church square from occupation; the Church’s opinion shall be collected and full coordination is required for resolution; during construction, appropriate measures shall be adopted to prevent the An’lan Guild Hall and the Fanchuanpu Church etc. from impact due to vibration from the construction;

② It is suggested not to occupy the Puxiazhou swamped land.

③ It is suggested to set the 3^rd Ring Road along the Wulongjiang River, and roundabout the village in order to occupy less farm land and demolish less houses;

④ Flyover crossing shall be avoided when never possible when passing by the villages;

3) Opinions from people along the line during the construction period

The road construction can be concentrated in a considerably short period, so that the inconvenience to residents along the road due to the construction noise could be shortened; the construction site shall be reasonably arranged, with the concrete mixer, bitumen cooking facilities far away from the residential places.

4) Suggestions to be taken into consideration after the road is constructed and put into use:

After the road is constructed and put into use, there will be more residential buildings and office buildings by the road. However, the heavy vehicles will cause pollutions like noises, exhaust and dusts. Therefore, it is suggested to put traffic limit on Nanjiang Binlu and stop heavy motor vehicles and transient vehicles.

14.8 General Conclusion

Construction of the Two Roads & One Bridge will improve the road network structure of Fuzhou City, which will help the land development and construction of the new area, promote the traffic and guide the city development. It has great significance to change the investment environment of Fuzhou City, propel development of the city economy and display the function of the Fuzhou City as capital of Fujian Province.

The Nanjiang Binlu is originally designed to set across Puxiazhou swamped land. If it is implemented that way, the very swamped land will be damaged seriously. Therefore, the route is changed to South Qianheng Road. Such a change is purposed to protect the swamped land from environmental pollution and damage, which is the best protection to the environment.

As the Two Roads and One Project will occupy some farm lands and woodlands, construction thereof will affect the local agricultural economy to a certain degree. However, the area along the Two Roads & One Bridge has been planned as a new urban area and the farm land has turned into urban land, the loss to agricultural economy will be compensated from development of the urban economy.

During construction period of Kuiqi Bridge, the construction unit shall also do filtration and sedimentation treatment towards the slurry water and stop direct discharge of other hazardous materials into the Kuiqi Section of Minjiang River; during operation period, relevant measures shall be adopted to prevent risky accident to protect the ecologic environment of the fish and the clam farm.

Along the Two Roads & One Bridge, there are 9 cultural property under District-Level protection, among which, great impact will be on the Fanchanpu Catholic Church only due to construction of the Nanjiang Binlu. For other cultural property, there is little or no impact. Therefore, construction of the new residential building of Fanchangpu Church and landscape construction for the church will be well prepared so that the adverse impact therefrom will be minimized.

Upon completion of the Two Roads & One Bridge Project, there would be no apparent impact by the exhaust of vehicles upon the ambient air within near range of the route under general weather conditions; the traffic noise will bring certain impact upon residents in the first row of buildings by both sides of the route. Therefore, relevant mitigation measures shall be applied to reduce impact upon surrounding environment after the project is put into operation.

To sum up, except the section at north of the Fanchuanpu Church where the route is difficult to avoid, the route selection of the Nanjiang Binlu, the Phase-II Project of the Third Ring Road and the Kuiqi Bridge is reasonable. If the construction unit can adopt mitigation measures suggested in this statement for the pollution, the impact upon the surrounding environment can be controlled. Therefore, viewing from the environmental impact, construction of the Nanjiang Binlu, the 3^rd Ring Road and the Kuiqi Bridge is feasible.

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