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HJ 25.2-2019

Chinese Standard: 'HJ 25.2-2019'
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HJ 25.2-2019English319 Add to Cart Days<=4 Technical guidelines for monitoring during risk control and remediation of soil contamination of land for construction Valid HJ 25.2-2019
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BASIC DATA
Standard ID HJ 25.2-2019 (HJ25.2-2019)
Description (Translated English) (Technical guidelines for soil pollution risk management and repair monitoring on construction land)
Sector / Industry Environmental Protection Industry Standard
Word Count Estimation 16,144
Date of Issue 2019-12-05
Date of Implementation 2019-12-05
Older Standard (superseded by this standard) HJ 25.2-2014
Regulation (derived from) Ministry of Ecology and Environment Announcement No. 52 of 2019

HJ 25.2-2019
(Technical guidelines for soil pollution risk management and repair monitoring on construction land)
National Environmental Protection Standard of the People's Republic of China
Replaces HJ 25.2-2014
Control and Remediation of Construction Site Soil Pollution Risk
Monitoring technical guidelines
Technical guidelines for monitoring during risk control and remediation of
soil contamination of land for construction
2019-12-5 release
2019-12-5 Implementation
Released by the Ministry of Ecology and Environment
Contents
Foreword ... ii
1 Scope ... 1
2 Normative references ... 1
3 Terms and definitions ... 1
4 Basic principles, work content and work procedures ... 2
5 Monitoring plan development ... 3
6 Monitoring point layout ... 4
7 Sample Collection ... 9
8 Sample analysis ... 11
9 Quality control and quality assurance ... 11
10 Preparation of monitoring report ... 12
Foreword
According to the "Environmental Protection Law of the People's Republic of China" and the "Law of the People's Republic of China on Soil Pollution Control",
Physical health, protecting the ecological environment, strengthening environmental protection and management of construction land, standardizing soil pollution risk management of construction land
Control and repair monitoring, develop this standard.
This standard specifies the principles, procedures, work contents and techniques for the management and restoration monitoring of soil pollution risks on construction land.
Claim.
This standard was first published in.2014, and this is the first revision. The main contents of this revision include.
1. The standard name was revised from the Technical Guidelines for Site Environmental Monitoring to the Management and Remediation of Soil Pollution Risks on Construction Land
Guidelines for Monitoring Technology;
2. The scope of application shall be modified accordingly with reference to the standard name;
3. Added the normative reference document "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard" (GB
36600), updated the relevant standard content of normative references;
4. Added terms and definitions for "soil pollution risk control and restoration", deleted "site" and "contaminated site"
Terms and definitions, modified the terms and definitions of "concerned about pollutants";
5. Modify "Repair Engineering Acceptance" to "Repair Effect Evaluation" and "Deep Soil" to "Lower Soil"
Soil ";
6. Improved the relevant content of the monitoring project and well washing requirements, and refined the vertical sampling interval of soil and evaluation of remediation effect
Monitor layouts and more.
This standard and the following standards belong to a series of environmental protection standards for soil pollution risk management and restoration of construction land.
"Technical Guidelines for Investigation of Soil Pollution on Construction Land" (HJ 25.1);
"Technical Guidelines for Risk Assessment of Soil Pollution on Construction Land" (HJ 25.3);
"Guidelines for Soil Remediation Technology for Construction Land" (HJ 25.4);
"Technical Guidelines for Risk Control of Contaminated Land and Evaluation of Soil Remediation Effect" (HJ 25.5);
"Guidelines for Groundwater Remediation and Risk Management and Control of Contaminated Land" (HJ 25.6).
As of the implementation of this standard, the Technical Guidelines for Site Environmental Monitoring (HJ 25.2-2014) is abolished.
This standard was formulated by the Department of Soil Ecology and Environment, Laws and Standards Department of the Ministry of Ecology and Environment.
The main drafters of this standard. Shenyang Research Institute of Environmental Sciences, Institute of Environmental Standards of the Ministry of Ecology and Environment, Light Industry Environmental Protection
Institute of Environmental Protection, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Shanghai Academy of Environmental Sciences.
This standard was approved by the Ministry of Ecology and Environment on December 5,.2019.
This standard will be implemented as of December 5,.2019.
This standard is explained by the Ministry of Ecology and Environment.
Technical guidelines for soil pollution risk management and repair monitoring on construction land
1 Scope
This standard specifies the basic principles, procedures, work content and
skills requirement.
This standard applies to the investigation of soil pollution on construction land and the assessment of soil pollution risk, risk control, restoration,
Environmental monitoring of activities such as risk management and control effectiveness assessment, restoration effectiveness assessment, and subsequent management.
This standard does not apply to the monitoring of radioactive and pathogenic biological pollution on construction land.
2 Normative references
The content of this standard refers to the clauses in the following documents. For undated references, the valid version applies
For this standard.
GB 3095 Ambient Air Quality Standard
GB 5085 Hazardous Waste Identification Standard
GB 14554 Emission Standard for Odor Pollutants
GB 36600 Soil Environmental Quality Control Standards for Soil Pollution Risk of Construction Land
GB 50021 Geotechnical Engineering Exploration Code
HJ/T 20 Technical Specifications for Sampling and Preparation of Industrial Solid Waste
HJ 25.1 Technical Guidelines for Investigation of Soil Pollution on Construction Land
HJ 25.4 Technical guidelines for soil remediation for construction land
HJ 25.5 Technical Guidelines for Risk Management and Contamination Evaluation of Contaminated Land
HJ/T 91 Technical specifications for surface water and sewage monitoring
HJ/T 164 Technical Specifications for Groundwater Environmental Monitoring
HJ/T 166 Technical Specifications for Soil Environmental Monitoring
HJ/T 194 Technical Specifications for Manual Monitoring of Ambient Air Quality
HJ 298 Technical Specification for Hazardous Waste Identification
HJ 493 Technical regulations for the storage and management of water samples
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Risk control and remediation of soil contamination
Soil pollution risk management and remediation includes investigation of soil pollution status and assessment of soil pollution risks, risk management and control, repair
Assessment, risk management and control effect assessment, restoration effect assessment, and later management activities.
3.2
Contaminant of concern
Determine the need for soil pollution based on the characteristics of the land pollution, relevant standards and specifications, and stakeholder opinions
Pollutants in environmental surveys and soil pollution risk assessments.
3.3
Soil mixture sample
Refers to the soil sample after the surface layer or the same layer of soil is evenly mixed. The number of sampling points that make up the mixed sample should be 5-20.
4 Basic principles, work content and work procedures
4.1 Basic principles
4.1.1 Principles of relevance
Plot environmental monitoring should be based on the investigation of soil contamination status, soil pollution risk assessment, treatment and restoration, and evaluation of restoration effects.
The purpose and requirements of environmental management at various stages such as assessment and retrospective assessment are carried out to ensure the coordination, consistency and timeliness of monitoring results.
Effectiveness, providing a basis for environmental management of the plot.
4.1.2 Normative principles
Programmatically and systematically standardize the basic principles, working procedures and working methods that should be followed in the environmental monitoring of land plots
Method to ensure the scientificity and objectivity of the land environment monitoring.
4.1.3 Feasibility Principle
Survey and review of soil pollution status and soil pollution risk assessment, governance and restoration, and assessment of remediation effects
In the conditions of monitoring requirements at various stages such as performance assessment, comprehensive consideration of factors such as monitoring costs and technology application levels, to ensure that
The monitoring work was feasible and the follow-up work went smoothly.
4.2 Work content
4.2.1 Survey and monitoring of soil pollution in the plot
The environmental monitoring during the investigation of soil pollution status and the risk assessment of soil pollution, the main work is to use monitoring
Means to identify pollutants of concern and hydrogeological characteristics in soil, groundwater, surface water, ambient air, residual waste
Collect, and comprehensively analyze and determine the types of pollution, the degree of pollution, and the scope of pollution in the plot.
4.2.2 Monitoring of land improvement and repair
Environmental monitoring during land remediation and repair, the main work is the implementation effect of various remediation and repair technical measures
Relevant monitoring carried out, including the monitoring of environmental protection engineering quality and secondary pollutant discharge during the process of remediation
Monitoring.
4.2.3 Evaluation and monitoring of land restoration effect
The environmental monitoring after the completion of the land remediation project is to assess and evaluate the
Whether it has met the identified restoration goals and the relevant requirements raised by the engineering design.
4.2.4 Retrospective Evaluation and Monitoring of Land
After evaluation of the repair effect of the land, within a specific time range, in order to evaluate the land and soil
Environmental monitoring of the environmental impacts of sewage, surface water and ambient air, as well as long-term in situ treatment of the land
Validate environmental monitoring of the effects of physical restoration measures.
4.3 Working Procedure
The working procedures of land environmental monitoring mainly include monitoring content determination, monitoring plan formulation, monitoring implementation and monitoring report
Report preparation. The determination of the monitoring content is to determine the specific work content according to the requirements in 4.2 after the monitoring is started; the monitoring plan is formulated
Including the process of data collection and analysis, determination of monitoring scope, monitoring medium, monitoring project and monitoring work organization, etc.
The implementation includes monitoring point layout, sample collection and sample analysis.
5 Development of monitoring plan
5.1 Data collection and analysis
According to the phased conclusions of the investigation of the soil pollution status of the plot, and consider the monitoring and evaluation of the remediation effect of the plot
Monitoring and retrospective evaluation The purpose and requirements of each stage of monitoring, determine the plot information that should be collected in each stage of monitoring,
It shall include the information obtained in the investigation phase of the soil contamination of the plot and the information collected in the monitoring and supplementary stages.
5.2 Monitoring scope
5.2.1 The monitoring range of the soil pollution status of the plot is the boundary range of the plot initially determined in the previous soil pollution status survey.
Around.
5.2.2 The monitoring scope of the land remediation repair shall include the land remediation scope determined in the design of the remediation repair project, and the
Areas affected by wastewater, waste gas, and residue during remediation.
5.2.3 The monitoring scope of the land remediation effect evaluation shall be consistent with the scope of land remediation and restoration.
5.2.4 The retrospective assessment and monitoring scope of the plot shall include the potential for environmental impact on soil, groundwater, surface water and ambient air
The extent of the impact, and the extent of the area that may be affected by long-term remediation projects.
5.3 Monitoring objects
The monitoring objects are mainly soil, and if necessary, groundwater, surface water, and ambient air should also be included.
5.3.1 Soil
The soil includes the top soil and the lower soil in the plot. The specific depth division of the top soil and the lower soil should be based on
The periodic conclusions of the investigation of the soil pollution status of the plot were determined. The backfill layer present in the plot can generally be used as topsoil.
5.3.2 Groundwater
Groundwater is mainly groundwater within the boundary of the plot or shallow groundwater that flows through the plot to the downstream pooling area. in
In areas where the pollution is heavy and the geological structure is conducive to the migration of pollutants to the lower soil, deep groundwater is monitored.
5.3.3 Surface water
Surface water is mainly surface water flowing through or pooling within the boundary of the plot. For heavily polluted plots, it should also be considered
Downstream pooling area of surface water.
5.3.4 Ambient air
Ambient air refers to the air in the center of the contaminated area of the plot and the air downwind to the main environmentally sensitive points.
5.3.5 Residual waste
Residual waste of the plot should also be considered in the monitoring object of the survey of soil pollution in the plot, mainly including the residual in the plot
Production materials, industrial waste residues, waste chemicals and their pollutants, solid residues left in waste facilities, containers and pipelines
Solid, semi-solid, and liquid materials, and other solid materials that differ significantly from local soil characteristics.
5.3.6 The object of land remediation and repair monitoring should also include substances discharged during the remediation process, such as waste gas, wastewater and waste
Slag etc.
5.4 Monitoring project
5.4.1 Survey and monitoring project of soil pollution in the plot
5.4.1.1 The preliminary sampling and monitoring items for the investigation of soil pollution in the plot shall be in accordance with the requirements of GB 36600 and the preliminary soil pollution status.
The phased conclusions of the survey and the work plan at this stage are determined, and they are determined in accordance with the relevant requirements of HJ 25.1. Possible risks
Hazardous waste monitoring projects shall be determined with reference to relevant indicators in GB 5085.
5.4.1.2 Detailed survey of soil pollution in the land
The characteristics of dyes and plots shall be determined in accordance with the relevant requirements of HJ 25.1.
5.4.2 Land governance and restoration, restoration effect evaluation and retrospective evaluation monitoring project
5.4.2.1 Soil monitoring items are indicators for soil pollution risk assessment that need to be treated and repaired. Groundwater, surface
Water and ambient air monitoring projects shall be determined according to the technical requirements for treatment and restoration.
5.4.2.2 The monitoring project should also consider the pollutants that may be generated during the land remediation and repair process.
The technical requirements of the double process are determined, see relevant requirements in HJ 25.4.
5.5 Organization of monitoring work
5.5.1 Division of monitoring work
The division of labor in monitoring generally includes information collection and arrangement, monitoring plan preparation, monitoring point layout, sample collection and
On-site analysis, sample laboratory analysis, data processing, monitoring report preparation, etc. The undertaking unit should organize according to the monitoring task
Good division of responsibilities within the unit and between cooperating units.
5.5.2 Preparation for monitoring
The preparation of monitoring work generally includes the division of labor, information collection, work plan preparation, and personal protection
Equipment, site surveys, sampling equipment and containers and analytical instruments.
5.5.3 Implementation of monitoring work
The implementation of monitoring work mainly includes the monitoring point layout, sample collection, sample analysis, and subsequent data processing.
And report preparation. In general, the core of the implementation of monitoring work is spot sampling, so on-site spot sampling should be implemented in a timely manner.
Relevant working conditions. In the process of sample collection, preparation, transportation and analysis, the necessary technology and management should be adopted
Measures to ensure the safety protection of monitoring personnel.
6 Monitoring point layout
6.1 Monitoring point layout method
6.1.1 Soil monitoring point layout method
Geographical location, plot boundaries, and work requirements at each stage determined based on the periodic conclusions of the survey of soil pollution in the plot
Seek to determine the range of points. Mark the exact geographic location on the area map or plan map, draw plot boundaries, and
Position the corners of the field accurately. Commonly used monitoring point layout methods for soil environment monitoring of the plot include systematic random distribution
Method, system layout method and partition layout method, see Figure 1.
Figure 1 Schematic diagram of monitoring point layout method
6.1.1.1 For the areas with similar soil characteristics and the same land use function in the plot, the system random distribution method can be used.
Monitoring point layout.
1) The system random distribution method is to divide the monitoring area into several working units of equal area, from which random (random number
To obtain a method that can be used to roll the dice, draw lots, and check the random number table, draw a certain number of work units, and
A monitoring point is arranged in the unit.
2) The number of samples taken should be determined according to the area of the plot, the purpose of monitoring and the use of the plot.
6.1.1.2 If the soil pollution characteristics of the plot are unclear or the original condition of the plot is severely damaged, the system can be used for monitoring
Point layout. The system layout method is to divide the monitoring area into several working units of equal area.
A monitoring point.
6.1.1.3 For the parcels with different land use functions and obvious differences in pollution characteristics, the zoning method can be adopted.
Monitoring point layout.
1) The zoning method is to divide the plot into different plots, and then determine the plots based on the plot area or pollution characteristics.
method.
2) The division of land use functions within a plot is generally divided into production area, office area, and living area. In principle, the production area
The division of units should be based on structures or production processes, including production workshops, raw materials and product storage, and wastewater
And waste slag storage yard, material circulation road in the yard, underground storage structure and pipeline, etc. The office area includes office buildings,
Fields, roads, green spaces, etc., living areas include canteens, dormitories and public buildings.
3) For production areas with similar land use functions and small unit areas, several units can also be combined into a single monitor.
作 UNIT.
6.1.1.4 Setting method of soil control monitoring points
1) In general, soil control monitoring points should be set in the outer area of the plot.
2) The control points can be selected on the four vertical axes in the outer area of the plot.
Sampling points for sampling analysis. For example, due to topography, land use, and the characteristics of pollutant diffusion and migration, etc.
When the soil characteristics are significantly different or the sampling conditions are limited, the monitoring points can be adjusted according to the actual situation.
3) The control monitoring point should try to choose bare soil that has not been disturbed by outside in a certain period of time, and should collect surface soil
For samples, the sampling depth should be the same as that of the top surface soil. Sub-soil samples should also be taken if necessary.
6.1.2 Groundwater monitoring point layout method
If there is groundwater in the plot, the site should be located in the area suspected of being heavily polluted.
Spot downstream. If it is necessary to understand the pollution characteristics of the plot through groundwater monitoring, groundwater runoff within a certain distance
Spots in the downstream catchment area.
System random layout method
6.1.3 Setting method of surface water monitoring points
If there is surface water flowing or pooled in the plot, the surface water should be distributed in the area suspected of being polluted.
Consider locating points downstream of surface water runoff.
6.1.4 Ambient air monitoring point layout method
Place the site in the center of the plot and the main environmentally sensitive points in the downwind direction at that time. For the production workshop, original
Areas where pollution is concentrated, such as storage areas for waste materials or waste residues, should be located in these areas; for organic pollution, foul smell
Plots of contaminated and mercury-contaminated types should be located in areas suspected of being heavily polluted.
6.1.5 Placement of residual waste monitoring points in the plot
In areas where residual waste that is suspected to be hazardous waste and suspicious substances that are significantly different from local soil characteristics are located
Line up.
6.2 Arrangement of monitoring points for soil pollution in the plot
6.2.1 Arrangement of soil monitoring points
6.2.1.1 The layout of preliminary sampling and monitoring points for soil pollution investigation
1) Several working units that may be heavily polluted can be selected as soil according to the use function and pollution characteristics of the original plot
Unit of work for pollutant identification. In principle, the monitoring point should be selected in the center of the work unit or a part with obvious pollution, such as
Production workshop, sewage pipeline, waste storage place, etc.
2) For evenly polluted land (including types and degree of pollution) and heavily damaged land (including land parcels)
Including demolition damage, historical change damage), according to the shape of the plot, a systematic random layout method can be used in each work
The center of the cell is sampled.
3) The number and sampling depth of monitoring points should be investigated according to the area of the plot, the type of pollution, and different functional areas.
Periodic conclusions are confirmed.
4) For each work unit, the division of the surface soil and the underlying soil in the vertical direction should be considered comprehensively.
Factors such as displacement, damage to structures and pipelines, and soil characteristics are determined. Sampling depth should be deducted from surface non-soil hardening
Layer thickness, in principle, 0 ~ 0.5 m surface soil samples should be collected, and lower soil samples below 0.5 m should be collected according to the method of judging and arranging
It is recommended that the soil sampling interval of 0.5 ~ 6 m should not exceed 2 m; at least one soil sample should be collected from different soil layers. Identity
When the thickness of the soil layer is large or there are obvious signs of contamination, increase the sampling points at this level according to the actual situation.
5) Under normal circumstances, the determination of the underlying soil should be determined based on the periodic conclusions of the survey of soil pollution in the plot and the site conditions.
Sampling depth, the maximum depth should be up to the uncontaminated depth.
6.2.1.2 Detailed soil sampling status investigation
1) For evenly polluted land (including types and degree of pollution) and heavily damaged land (including land parcels)
Including demolition damage, historical change damage), the system can be divided into work units using the system layout method.
Center sampling.
2) If there are obvious differences in the use function or pollution characteristics of different areas of the plot, you can investigate the soil pollution status
The information about the original use function and pollution characteristics is divided into work units by the partition layout method.
Center sampling.
3) The area of a single work unit can be determined according to actual conditions, and in principle should not exceed 1600 m2. For area comparison
For small plots, there should be no less than 5 work units. Sampling depth should be determined by preliminary sampling monitoring of soil pollution survey
For maximum depth and depth interval, refer to the relevant requirements in 6.2.1.1.
4) If you need to collect mixed soil samples, you can divide them according to the degree of pollution of each work unit and the area of the work unit.
1 to 9 grids of equal area are sampled at the center of each grid, and soil samples of the same layer are made into mixed samples (determining volatility
Except for samples of sexual organic matter).
6.2.2 Arrangement of groundwater monitoring points
6.2.2.1 For the groundwater flow direction and groundwater level, it can be separated by a certain distance from
Triangular or quadrangular at least 3 ~ 4 points are monitored and judged.
6.2.2.2 The groundwater monitoring points shall be laid along the groundwater flow direction. The groundwater flow may be upstream and the groundwater may be severely polluted.
Monitoring points shall be set for heavy areas and groundwater flows downstream. When determining the degree and extent of groundwater pollution, reference should be made to
The monitoring points of the soil at the detailed monitoring stage are determined according to the actual situation, and the points are densely distributed in the heavily polluted areas.
6.2.2.3 The depth of the monitoring well shall be determined according to the monitoring purpose, the type of aquifer, its burial depth and relative thickness.
Penetrate the shallow groundwater floor. There must be good water-stop between groundwater monitoring target layer and other aquifers.
6.2.2.4 In general, the sampling depth should be below 0.5 m below the surface of the monitoring well. For low-density water-insoluble organic matter
Monitoring points should be set on top of the aquifer; for high-density non-water-soluble organic pollution, the monitoring points should be set at
Bottom of the aquifer and top of the impervious layer.
6.2.2.5 In general, a control monitoring well shall be set up a certain distance upstream of the groundwater flow.
6.2.2.6 If the area of the plot is large, the groundwater pollution is heavy, and the groundwater is abundant, it can be used for the groundwater runoff in the plot.
You and downstream each increase 1 or 2 monitoring wells.
6.2.2.7 If there are no shallow groundwater monitoring wells in the block that meet the requirements, the
Monitoring wells are arranged downstream of the runoff.
6.2.2.8 If the underground rock layer of the plot is shallow and there is no shallow groundwater enrichment, the underground
Monitoring wells are set up in the water storage area.
6.2.2.9 If the shallow groundwater pollution monitored in the previous stage is very serious and there is deep groundwater, it can be stopped in layers.
Under conditions, a deep well to deep groundwater was added to evaluate the pollution of deep groundwater.
6.2.3 Arrangement of surface water monitoring points
6.2.3.1 When investigating the impact of surface runoff on the surface water of the plot, sampling can be conducted in the rainy and non-rainy periods. Such as
Need to reflect the impact of land pollution sources on surface water, according to the surface water flow can be entered in dry season, high season and flat season
Line sampling.
6.2.3.2 While monitoring the concentration of pollutants, the runoff of surface water should also be monitored to determine the migration of pollutants to surface water
Shift amount.
6.2.3.3 If necessary, control monitoring points can be arranged at a certain distance upstream of surface water.
6.2.3.4 For the specific requirements for the layout of monitoring points, refer to HJ/T 91.
6.2.4 Arrangement of Ambient Air Monitoring Points
6.2.4.1 If you need to inspect the ambient air in the plot, you can
Monitoring points are set for the main environmental sensitive points within the boundary of the wind direction block and within 500 m outside the boundary.
1.5 ~ 2.0 m.
6.2.4.2 In general, control monitoring points should be set in the upwind direction of the plot.
6.2.4.3 For types of parcels such as organic pollution and mercury pollution, especially those contaminated by volatile organic compounds,
Select the center of the most contaminated work unit, strip the surface soil 0.2 m above the ground, and then sample and monitor.
6.2.5 Arrangement of monitoring points for residual waste on the plot
According to the results of the previous survey, the residual wastes that may be hazardous wastes are spotted in accordance with relevant requirements of HJ 298
kind.
6.3 Arrangement of monitoring points for land improvement and repair
6.3.1 Monitoring of residual hazardous waste in the plot and soil cleaning effect with characteristics of hazardous waste
6.3.1.1 After the cleanup of residual hazardous waste on the plot and soil with characteristics of hazardous waste is completed, the
The soil was spot-sampled. According to the characteristics and size of the interface, it is divided into several working units of equal area. The unit area
It should not exceed 100m2. Nine surface soil samples can be collected uniformly in each work unit to make a mixed sample (test
Excluding samples of volatile organic compounds).
6.3.1.2 If the monitoring result still exceeds the corresponding treatment target value, the boundary of secondary cleaning shall be determined based on the monitoring result.
After cleaning, monitor again until the cleaning reaches the standard.
6.3.1.3 The monitoring results of residual hazardous wastes and soil cleaning effects with characteristics of hazardous wastes can be used as the evaluation results of remediation effects
Fruit component.
6.3.2 Monitoring of the effect of removing contaminated soil
6.3.2.1 Monitoring of the interface after the completion of excavation of contaminated soil, including the sides and bottom of the interface. According to plot size and
The intensity of pollution should be divided equally into four sides. The maximum length of each section should not exceed 40 m.
Mixed surface soil samples (except for samples for volatile organic compounds); worksheets are evenly distributed at the bottom
Unit, the maximum area of the unit should not exceed 400 m2, and 9 surface soil samples were evenly distributed in each working unit
The product is made into a mixed sample (except the sample for the determination of volatile organic compounds).
6.3.2.2 For the area beyond the standard, determine the boundary of the second excavation according to the monitoring results, and monitor again after the second excavation until
Meet the corresponding requirements.
6.3.2.3 The monitoring of the effect of excavation of contaminated soil can be used as an integral part of the assessment results of remediation effects.
6.3.3 Monitoring of treatment and repair of contaminated soil
6.3.3.1 The monitoring points or monitoring frequency during the process of remediation shall be based on the in-situ remediation process specified in the project design.
The technical requirements determine that the soil volume represented by each sample should not exceed 500 m3.
6.3.3.2 The materials that may be discharged during the treatment and repair process shall be monitored at locations such as the setting of wastewater,
Exhaust gas outlets should be set at monitoring points.
6.3.4 During the process of remediation, if monitoring of groundwater, surface water and ambient air is required, the monitoring points shall be
Requirements for environmental impact assessment or restoration engineering design.
6.4 Arrangement of monitoring points for evaluation of land restoration effects
6.4.1 The assessment and monitoring of the soil remediation effect of the rehabilitated land shall generally adopt the system layout method to set monitoring points.
The area of each working unit should not exceed 1600 m2 in principle. Specific layout requirements refer to HJ 25.5.
6.4.2 The monitoring of the effect of in-situ treatment and restoration engineering measures (such as isolation, anti-migration and proliferation, etc.) shall be based on the engineering design
Relevant requirements require the deployment of monitoring points.
6.4.3 Monitoring the effect of ectopic treatment and restoration engineering measures. After the treatment, a certain number of monitoring points shall be set for the soil.
The volume of soil represented by the sample should not exceed 500 m3. Specific layout requirements refer to HJ 25.5.
6.4.4 During the monitoring and evaluation of the repair effect, if it is found that the work unit has not reached the standard of remediation, it should be carried out twice.
Governance and repair, and re-assessment and monitoring of repair effect again after repair.
6.4.5 Monitor groundwater, surface water, and ambient air. The monitoring points are the same as those in 6.2.2, 6.2.3, and 6.2.4.
The measurement points are the same. Considering the related requirements of the in-situ restoration project, the monitoring points can be appropriately added.
6.4.6 Perform assessment and monitoring of groundwater remediation effect, survey of soil pollution status and soil pollution risk assessment
The number of monitoring wells constructed during the assessment and repair process, but the number of original monitoring wells should not exceed the
60% of the new monitoring wells are located in areas where groundwater is most polluted.
6.5 Site layout for retrospective evaluation of land parcels
6.5.1 Determination of soil ...
Related standard:   HJ 25.1-2019  HJ 25.3-2019
   
 
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