Statutes, codes, and regulations
District Of Columbia Administrative Code
Title 20 - ENVIRONMENT
Chapter 20-62 - UNDERGROUND STORAGE TANKS - REPORTING OF RELEASES, INVESTIGATION, CONFIRMATION, ASSESSMENT, AND CORRECTIVE ACTION
Rule 20-6208 - TIER 0 STANDARDS

D.C. Mun. Regs. tit. 20, r. 20-6208

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Current through Register Vol. 71, No. 36, September 6, 2024
Rule 20-6208 - TIER 0 STANDARDS
6208.1

The Tier 0 standards for soil shall be the following:

(a) Total petroleum hydrocarbons (TPH), gasoline range organics (GRO), or diesel range organics (DRO) concentrations in soil shall be no greater than one hundred milligrams per kilogram (100 mg/kg); and
(b) Individual chemicals of concern concentrations in soil shall not exceed:
(1) For benzene: five thousandths of a milligram per kilogram (0.005 mg/kg);
(2) For tolulene: nine and six tenths milligrams per kilogram (9.6 mg/kg);
(3) For ethylbenzene: four hundredths of a milligram per kilogram (0.04 mg/kg); and
(4) For total xylenes: three and eighty-six hundredths of a milligram per kilogram (3.86 mg/kg).
6208.2

The Tier 0 standards for water shall be the following:

(a) Levels for ground water quality are the District Water Quality Standards for Ground Water in 21 DCMR § 1155; and
(b) Levels for surface water quality are the District Water Quality Standards in 21 DCMR § 1104.

D.C. Mun. Regs. tit. 20, r. 20-6208

Final Rulemaking published at 40 DCR 7835, 7892 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999); amended by Final Rulemaking published at 67 DCR 1778 (2/21/2020)