undetected in high flow period. 17 indexes with limit values provided in the Quality
Standard for Groundwater were selected for the assessment of groundwater quality,
with the results as shown in Table 5.126.
As can be seen from Table 5.126, the water quality of the five groundwater
monitoring wells all did not meet the limit requirements of Class III standard in
Quality Standard for Groundwater. #4 well has all the indexes in compliance with
the Class III standard except for the total number of bacteria. The three indexes of
#1 monitoring well including the chloride, permanganate index, and the total
number of bacteria, the ammonia-nitrogen and total hardness of #2 monitoring well,
the four indexes of #6 monitoring well including total hardness, total soluble solids,
permanganate index and total number of bacteria, and the nitrite nitrogen and total
number of bacteria of 7# monitoring well exceeded the Class III standard, with the
ammonia-nitrogen of #1, the total number of bacteria of #2, #6, and the total soluble
solids of #7 having the largest excess multiple of 1.130, 2.3, 8.1 and 5.2
respectively.
III. Assessment results of low flow period
The sampling in low flow period was conducted on January 19, 2016. From the
sampling results, the sensory indexes (chroma, visible particulate matter, smell,
taste, and water temperature) of the five samples are normal. 28 indexes were
selected for testing in the low flow period as are the same with the level period, by
eliminating the indexes undetected in high flow period. 17 indexes with limit values
provided in the Quality Standard for Groundwater were selected for the assessment
of groundwater quality, with the results as shown in Table 5.127.
As can be seen from Table 5.127, the water quality of the five groundwater
monitoring wells all did not meet the limit requirements of Class III standard in
Quality Standard for Groundwater. #4 well has all the indexes in compliance with
the Class III standard except for the total number of bacteria. The three indexes of
#1 monitoring well including the chloride, fluoride, and the total number of bacteria, the total hardness of #2 monitoring well; the four indexes of #6 monitoring
well including total hardness, total soluble solids, permanganate index and total
number of bacteria, and the fluoride, total soluble solids, nitrite nitrogen and total
number of bacteria of 7# monitoring well exceeded the Class III standard, with the
total number of bacteria of #1, the total hardness of #2, the total number of bacteria
of #6, and the nitrite nitrogen of #7 having the largest excess multiple of 5.6, 1.24,
140 and 30.3 respectively.
(2) Assessment of groundwater pollution
① Assessment method
The groundwater pollution is assessed by the individual factor index method as
described in Sect. 2.2.7. According to the definition of groundwater pollution, the
groundwater is regarded as polluted if certain chemical component exceeds its
natural background value, and the more it goes beyond its background value, the
more serious the pollution is.
374
5 Application Cases
Standard for Groundwater were selected for the assessment of groundwater quality,
with the results as shown in Table 5.126.
As can be seen from Table 5.126, the water quality of the five groundwater
monitoring wells all did not meet the limit requirements of Class III standard in
Quality Standard for Groundwater. #4 well has all the indexes in compliance with
the Class III standard except for the total number of bacteria. The three indexes of
#1 monitoring well including the chloride, permanganate index, and the total
number of bacteria, the ammonia-nitrogen and total hardness of #2 monitoring well,
the four indexes of #6 monitoring well including total hardness, total soluble solids,
permanganate index and total number of bacteria, and the nitrite nitrogen and total
number of bacteria of 7# monitoring well exceeded the Class III standard, with the
ammonia-nitrogen of #1, the total number of bacteria of #2, #6, and the total soluble
solids of #7 having the largest excess multiple of 1.130, 2.3, 8.1 and 5.2
respectively.
III. Assessment results of low flow period
The sampling in low flow period was conducted on January 19, 2016. From the
sampling results, the sensory indexes (chroma, visible particulate matter, smell,
taste, and water temperature) of the five samples are normal. 28 indexes were
selected for testing in the low flow period as are the same with the level period, by
eliminating the indexes undetected in high flow period. 17 indexes with limit values
provided in the Quality Standard for Groundwater were selected for the assessment
of groundwater quality, with the results as shown in Table 5.127.
As can be seen from Table 5.127, the water quality of the five groundwater
monitoring wells all did not meet the limit requirements of Class III standard in
Quality Standard for Groundwater. #4 well has all the indexes in compliance with
the Class III standard except for the total number of bacteria. The three indexes of
#1 monitoring well including the chloride, fluoride, and the total number of bacteria, the total hardness of #2 monitoring well; the four indexes of #6 monitoring
well including total hardness, total soluble solids, permanganate index and total
number of bacteria, and the fluoride, total soluble solids, nitrite nitrogen and total
number of bacteria of 7# monitoring well exceeded the Class III standard, with the
total number of bacteria of #1, the total hardness of #2, the total number of bacteria
of #6, and the nitrite nitrogen of #7 having the largest excess multiple of 5.6, 1.24,
140 and 30.3 respectively.
(2) Assessment of groundwater pollution
① Assessment method
The groundwater pollution is assessed by the individual factor index method as
described in Sect. 2.2.7. According to the definition of groundwater pollution, the
groundwater is regarded as polluted if certain chemical component exceeds its
natural background value, and the more it goes beyond its background value, the
more serious the pollution is.
374
5 Application Cases