D.C. Mun. Regs. tit. 20, r. 20-6205

Current through Register Vol. 71, No. 52, December 27, 2024

Rule 20-6205 - COMPREHENSIVE SITE ASSESSMENT

6205.1

Unless otherwise directed by the Department, the responsible party shall perform a comprehensive site assessment in the time and manner set forth in this section.

6205.2

Within sixty (60) days after Department approval of a work plan pursuant to § 6203.14, the responsible party shall submit a comprehensive site assessment report to the Department, in accordance with § 5500.4, in a form satisfactory to the Department, which is available on the Department's website at https://doee.dc.gov/page/lust- forms-guidance-and-public-documents.

6205.3

A comprehensive site assessment report shall include the following elements, as appropriate to the conditions of the site:

(a) The nature of the release, including: the chemical compound (s) present; its concentration(s); the quantity or quantities released if known; and the physical and chemical characteristic(s) related to potential human health and environmental impacts and cleanup procedures;

(b) Information from available sources or site investigations about :

(1) Current and reasonably foreseeable future surrounding land use;

(2) Surrounding populations;

(3) Water quality;

(4) Use and approximate location of wells potentially affected by the release;

(5) Subsurface soil conditions;

(6) Climatological conditions; and

(7) Locations of all subsurface utilities that are potential pathways, including sewers, water and gas pipelines, or other conduits;

(c) The results of the site investigation and any information gained while performing initial abatement measures pursuant to § 6203;

(d) The results of the free product investigations required under § 6203.13;

(e) The areal extent of the release, including the horizontal and vertical extent of the release, whether the chemicals of concern are distributed homogeneously or heterogeneously, and any future migration potential;

(f) The physical characteristics of the site, including characteristics affecting the occurrence, distribution, and movement of the released contaminant(s) and any characteristics affecting access to the site that may influence the feasibility of investigation and remediation procedures;

(g) A qualitative evaluation of the potential risks posed by the release, including identification of environmentally sensitive receptors, and an estimate of the impacts to human health and the environment that may occur as a result of the release;

(h) A comparison of contaminant levels to District soil and groundwater quality risk-based screening levels contained in § 6209; and

(i) Any other information requested by the Department or deemed useful or necessary by the responsible party.

6205.4

Comprehensive site assessment activities shall be conducted in accordance with a site safety and health plan that meets the requirements of 29 CFR § 1910.120. The site safety and health plan shall be available for inspection by the Department.

6205.5

Upon receipt and review of the comprehensive site assessment report, the Department may require the responsible party to conduct additional field studies and collect more data.

6205.6

The responsible party may request an extension of the sixty (60) day deadline set forth in § 6205.2 by submitting a written request for an extension to the Department, in accordance with § 5500.4, no later than forty- five (45) days after submitting the work plan pursuant to § 6203.14. The request shall include the following:

(a) A summary of all work performed and all information gathered to date pursuant to § 6205.3;

(b) A summary work plan for the additional assessment activities required; and

(c) A proposed schedule for completion of the remaining assessment activities and submission of the completed comprehensive site assessment report.

6205.7

The Department may grant or deny the request for extension, or grant the extension with modifications to the work plan or schedule.

D.C. Mun. Regs. tit. 20, r. 20-6205

Final Rulemaking published at 40 DCR 7835, 7888 (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)