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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 20. ENVIRONMENT |
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Chapter 20-62. UNDERGROUND STORAGE TANKS - REPORTING OF RELEASES, INVESTIGATION, CONFIRMATION, ASSESSMENT AND CORRECTIVE ACTION |
Section 20-6209. TIER 1 STANDARDS
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6209.1The Tier 1 standards for water shall be as follows:
(a)The Tier 1 levels for ground water quality shall be the District of Columbia Water Quality Standards for Ground Water (21 DCMR Chapter 11) as outlined by the Director in the Risk-Based Decisionmaking Technical Guidance Document.
(b)The standard for total petroleum hydrocarbons (TPH) in ground water contaminated by non-gasoline petroleum contamination shall be one part per million (1 ppm).
(c)The Tier 1 levels for surface water quality are the District of Columbia Water Quality Standards (21 DCMR Chapter 11).
(d)Methyl tertiary-Butyl-Ether (MtBE) as adopted by the Director in the Risk-Based Decisionmaking Technical Guidance Document.
(e)Naphthalene as adopted by the Director in the Risk-Based Decisionmaking Technical Guidance Document.
6209.2Until the Director adopts the Tier 1 quality standards for soil or outlined in the Risk-Based Decisionmaking Technical Guidance Document, the Tier 0 standards for soil shall serve as the interim Tier 1 soil standards.