2024 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2023 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2022 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2021 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2020 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2019 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2016 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2015 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2014 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2010 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation

2009 40 CFR 312.31 – The degree of obviousness of the presence or likely presence of contamination at the property, and the ability to detect the contamination by appropriate investigation