The indicators specified in the Quality Standards for Groundwater (GB/
T14848–2017) are used for groundwater quality assessment, including ammonia,
iron, manganese and 15 indicators (excluding all undetected indicators). Where the
limits are the same for indicators of different water quality grades, the superior
grade shall prevail (Grade I for undetected indicators). The results of
indicator-specific evaluation and comprehensive evaluation are as shown in
Tables 5.43 and 5.44 respectively.
As shown in Table 5.43, only one of the ten groups of samples exceed the
fluoride limit, while the rest meet the standards, largely Grade I standards, for other
17 indicators.
According to the comprehensive evaluation results (Table 5.44), among the ten
groups of groundwater samples, the one taken at monitoring well #1 is classified
into Grade IV (relatively poor) as it only reaches Grade IV standard for fluoride.
Five sample groups, taken at monitoring wells #2, #3, #6, #9 and #10 respectively,
Table 5.43 Results of indicator-specific groundwater quality evaluation in the Dachaidan Landfill
Items
Central part of alluvial-pluvial fan
Central and front parts of the
alluvial-pluvial fan
well#1 well#2 well#3 well#4 well#5 well#6 well#7 well#8 well#9 well#10
Flavor level
I
I
I
I
I
I
I
I
I
I
Macroscopic
objects
I
I
I
I
I
I
I
I
I
I
p H
I
I
I
I
I
I
I
I
I
I
Total salinity
I
III
III
II
II
III
II
II
II
II
Total hardness
(CaCO 3 )
I
I I
I I
I
I I
I I
I
I
I
I I
Sulfate
I
II
II
II
II
III
II
I
II
II
Chloride
I
II
II
II
II
II
II
II
I
II
Copper
I
I
I
I
I
I
I
I
I
I
Lead
III
I
I
I
I
I
I
I
I
III
Zinc
I
I
I
I
I
I
I
I
I
I
Nitrate (in
nitrogen
terms)
I I
I
I
I
I
I
I
I
I I
I I
Nitrite (in
nitrogen
terms)
I I
I
I
I
I
I
I
I
I I
I I I
Ammonia
nitrogen
I I
I
I
I
I
I
I
I
I I I
I
Fluoride
IV
I
I
I
I
I
I
I
I
I
Volatile
phenols
I I I
I
I
I
I
I
I
I
I
I
Cyanide
II
I
I
I
I
I
I
I
I
I
Total alpha
radioactivity
I
I
I
I
I
I
I
I
I I I
I
Total beta
radioactivity
I I
I
I
I
I
I
I
I
I I
I
178
5 Application Cases