Current Water Environment Status, Impact Assessment and Mitigation Measures

7.1.3 Water Quality Monitoring Results and Assessment

We used the data obtained from normal monitoring of Kuiqi and Aofengzhou sections in 2002 to analyze the status of water environment. The results and analysis are shown in Table 7.1-3.

Table 7.1-3 Results of Monitoring and Statistics for Water Quality of Minjiang River Beigang Section (2002)

Section	Item	pH	CODMn	BOD5	DO	SS	Petroleum	NH3-N	Lead
Kuiqi	Average Value (mg/L)	6.92	2.58	1.34	7.08	41	0.04	0.475	0.0016
	Class III Standard (mg/L)	6～9	6	4	5	--	0.05	1.0	0.05
	Pollution Index	0.08	0.43	0.34	0.36	--	0.8	0.48	0.032
Aofengzhou	Average Value (mg/L)	6.97	2.53	1.43	7.74	--	--	0.340	0.0014
	Class II Standard (mg/L)	6～9	4	3	6	-	0.05	0.5	0.01
	Pollution Index	0.03	0.63	0.48	0.23	--	--	0.68	0.14

It can be seen from Table 7.1-3 that, by Class III, the pollution index for Kuiqi is 0.32-0.8 and the water quality conforms to Class III standard, and by Class II, the pollution index for Aofengzhou is 0.14-0.68 and the water quality conforms to Class II standard. This shows that the water quality of Minjiang River Beigang Aofeng – Kuiqi section is good.

(2) Inland Rivers Crossed by Nanjiang Binlu and the Phase-II Project of the Third Ring Road

For water quality monitoring results, please see Table 7.1-4.

It can be seen from the above results that:

1. 
   There is an index for the ammonia nitrogen of the crossed inland rivers: for Nanjiang Binlu, the maximum value is 24 times of the index and the minimum value is 2.4 times of the index, and for the Phase-II Project of the Third Ring Road , the maximum value is 9.7 times of the index and the minimum value is 2.0 times of the index. This is closely related to the fact that, for a long time, the island has discharged a lot of living wastewater and the loss of fertilizers from the agrihistoricalareas from the island.
   
2. 
   Most of the COD_Cr and BOD₅ values of the sections of inland rivers crossed by Nanjiang Binlu exceed the indexes set in Class V standard. Only the results of very few sections monitored are close to Class V water standard. For the 7 sections monitored of the 4 inland rivers crossed by the Phase-II Project of the Third Ring Road , the COD_Cr values do not exceed the index. As to the values of BOD₅ of the monitored sections, 4 sections exceed Class Ⅴ standard and 3 sections meet Class II-IV standards.
   
3. 
   For DO, half of the monitored sections of the inland rivers crossed by Nanjiang Binlu and the Phase-II Project of the Third Ring Road meet Class V standard, and for ph values, 50% of the monitored sections almost meet the index.
   
4. 
   The above assessment results show that, in the whole, the water quality of the inland rivers crossed by Nanjiang Binlu is very bad. The rivers can be classified as Class V water bodies. The water quality of the inland rivers crossed by the Phase-II Project of the Third Ring Road falls within Classes IV-V, so some are bad Class Ⅴ water bodies. Except the pH index, all the rest the evaluated factors exceed Class IV standard. In the whole, the water environment of the inland rivers has been seriously polluted.