D.C. Mun. Regs. tit. 20, § 6208
Tier 0 Standards
Authority: Section 107 of the District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code § 8-151.07 (2013 Repl. & 2019 Supp.)); the District of Columbia Underground Storage Tank Management Act of 1990, effective March 8, 1991 (D.C. Law 8-242; D.C. Official Code §§ 8-113.01 et seq. (2013 Repl.)); Sections 11 and 21 of the Water Pollution Control Act of 1984, effective March 16, 1985 (D.C. Law 5-188; D.C. Official Code §§ 8-103.10 & 8-103.20 (2013 Repl.)); and Mayor's Order 2006-61, dated June 14, 2006. Source: Final Rulemaking published at 40 DCR 7835, 7892 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999); as amended by Final Rulemaking published at 67 DCR 1778 (February 21, 2020).District of Columbia, Office of the Secretary
The Tier 0 standards for soil shall be the following:
(a) Total petroleum hydrocarbons (TPH) gasoline range organics (GRO) or diesel range organics (DRO) shall be no greater than one hundred parts per million (100 ppm);
(b) Total benzene, toluene, ethylbenzene, and total xylenes (BTEX) shall be no more than ten parts per million (10 ppm); and
(c) Benzene concentration shall be no more than one part per million (1 ppm).
SOURCE: Final Rulemaking published at 40 DCR 7835, 7892 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999).