Investigation of the Soil Contamination Countermeasures Act! Cost-optimized processes from historical background to overview.

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Soil contamination survey

last updated：Sep 07, 2026

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Investigation of the Soil Contamination Countermeasures Act! Cost-optimized processes from historical background to overview.

This is an efficient process for soil contamination surveys based on the Soil Contamination Countermeasures Act and the environmental protection ordinances of prefectures. From understanding land use history through Phase I historical investigations to confirming the presence or absence of contamination through Phase II on-site soil and soil gas sampling and chemical analysis, we will respond reliably as a designated investigation agency. We will propose an optimal survey plan that minimizes unnecessary costs.

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Investigation methods: Phase I (historical research, old maps, registry inquiries), Phase II (overview investigation, setting 10m/30m grids). Sampling targets: soil gas (volatile organic compounds), soil (leaching and content of heavy metals, pesticides, etc.). Regulatory compliance: Soil Contamination Countermeasures Act (Articles 3, 4, 5), Tokyo Metropolitan Environmental Protection Ordinance, etc. Ministry of the Environment designated investigation agency.

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Applications/Examples of results

Obligatory investigations during the dismantling or closure of factories and business sites, and prior notification investigations for developments or changes in land characteristics over 3000m2. Voluntary soil contamination risk assessments by sellers and buyers during real estate transactions, and their reflection in asset value calculations.