(2) Environmental background investigation
(a) Groundwater sampling
To further clarify the groundwater quality in the OCS site, samples were taken for
analysis in three groundwater monitoring wells around the site. The test items are
selected according to the Quality Standards for Groundwater (GB/T14848–2017)
and the Sanitary Standard for Drinking Water (GB5479–2006) (Table 5.49).
(b) Test results
The groundwater samples collected in the OCS investigation are tested based on the
Methods for Determination of Groundwater Quality (DZ/T0064.2–1993), and the
results are as shown in Table 5.50.
(c) Groundwater quality assessment
• Standards and methods
Grade III standards specified in the Quality Standards for Groundwater (GB/
T14848–2017) were applied to the study area. The standard index method described
in Sect. 2.2.7 is used for indicator-specific evaluation and comprehensive evaluation (Table 5.51).
• Results
In this groundwater quality assessment, the indicators included in the “Groundwater
Quality Standards” (GB/T 14848–2017) were selected for water quality evaluation.
The evaluation indicators include 12 indicators such as ammonia nitrogen, permanganate index and hexavalent chromium. When the index limits of different
groundwater quality categories are the same, they are from low to high (undetected
indicators are classified as type I). Groundwater quality evaluation results are
shown in Table 5.41.
The indicators covered by the Quality Standards for Groundwater (GB/T14848–
2017) are used for groundwater quality assessment, including ammonia nitrogen,
permanganate index, hexavalent chromium and other nine indicators. Where the
limits are the same for indicators of different water quality grades, the lower grade
Table 5.49 Test items for OCS groundwater samples
Type
Name
Quantity
Inorganic
indicators
pH, COD, sulfide, ammonia nitrogen, suspended solids, total
nitrogen, total phosphorus, hexavalent chromium, total
chromium, vanadium, nickel, lead, mercury, arsenic
14
Organic
indicators
Benzene, toluene, ethylbenzene, m/p-xylene, o-xylene
5
190
5 Application Cases
(a) Groundwater sampling
To further clarify the groundwater quality in the OCS site, samples were taken for
analysis in three groundwater monitoring wells around the site. The test items are
selected according to the Quality Standards for Groundwater (GB/T14848–2017)
and the Sanitary Standard for Drinking Water (GB5479–2006) (Table 5.49).
(b) Test results
The groundwater samples collected in the OCS investigation are tested based on the
Methods for Determination of Groundwater Quality (DZ/T0064.2–1993), and the
results are as shown in Table 5.50.
(c) Groundwater quality assessment
• Standards and methods
Grade III standards specified in the Quality Standards for Groundwater (GB/
T14848–2017) were applied to the study area. The standard index method described
in Sect. 2.2.7 is used for indicator-specific evaluation and comprehensive evaluation (Table 5.51).
• Results
In this groundwater quality assessment, the indicators included in the “Groundwater
Quality Standards” (GB/T 14848–2017) were selected for water quality evaluation.
The evaluation indicators include 12 indicators such as ammonia nitrogen, permanganate index and hexavalent chromium. When the index limits of different
groundwater quality categories are the same, they are from low to high (undetected
indicators are classified as type I). Groundwater quality evaluation results are
shown in Table 5.41.
The indicators covered by the Quality Standards for Groundwater (GB/T14848–
2017) are used for groundwater quality assessment, including ammonia nitrogen,
permanganate index, hexavalent chromium and other nine indicators. Where the
limits are the same for indicators of different water quality grades, the lower grade
Table 5.49 Test items for OCS groundwater samples
Type
Name
Quantity
Inorganic
indicators
pH, COD, sulfide, ammonia nitrogen, suspended solids, total
nitrogen, total phosphorus, hexavalent chromium, total
chromium, vanadium, nickel, lead, mercury, arsenic
14
Organic
indicators
Benzene, toluene, ethylbenzene, m/p-xylene, o-xylene
5
190
5 Application Cases