6 Colo. Code Regs. § 1007-2.4

Current through Register Vol. 47, No. 11, June 10, 2024

Section 6 CCR 1007-2.4 - Minimum Design Performance Criteria for Off-Site Hazardous Waste Disposal Sites and On-Site Hazardous Waste Landfills

2.4.1 Sites intended for use as landfills, surface impoundments and land treatment facilities subject to these regulations shall be located and designed in manner that the design performance will assure long-term protection of human health and the environment.

2.4.2 Hazardous waste disposal sites shall be designed to prevent adverse effects on groundwater quality, considering:

a) The volume and physical and chemical characteristics of the waste in the facility, including its potential for migration through any liners provided in the design and the surrounding soils or bedrock strata;

b) The hydrogeological characteristics of the facility and the surrounding land and other site specific factors which are basic to preventing adverse effects on groundwater quality;

c) The quantity, quality, and directions of flow of groudwater;

d) The proximity of existing and planned groundwater users and the withdrawal rates of such uses;

e) The existing quality of groundwater, including other sources of contamination and their cumulative impact on the groundwater;

f) The potential for health risks caused by human exposure to waste constituents;

g) The potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; and

h) The persistence and permanence of the potential adverse effects.

2.4.3 Hazardous waste disposal sites shall be designed to prevent adverse effects on surface water quality, considering:

a) The volume and physical and chemical characteristics of the waste in the facility;

b) The hydrogeological characteristics of the facility and surrounding land and other site specific factors which are basic to preventing adverse effects on surface water quality, including the topography of the area around the facility and any engineering features to influence surface water flow patterns that may be appropriate;

c) The quantity, quality, and directions of flow of surface water;

d) The patterns of precipitation in the region and potential impacts on disposal locations, including removal of wastes;

e) The proximity of the facility to surface waters;

f) The existing and planned uses of nearby surface waters and any water quality standards established for those surface waters;

g) The existing quality of surface water, including other sources of contamination and their cumulative impact on surface water;

h) The potential for health risks caused by human exposure to waste constituents;

i) The potential damage to wildlife, crops, vegetation and physical structures caused by exposure to waste constituents; and j) The persistence and permanence of the potential adverse effects.

2.4.4 Hazardous waste disposal sites shall be designed to prevent adverse effects on air quality, considering:

a) The volume and physical and chemical characteristics of the waste in the facility, including its potential for volatilization and wind dispersal;

b) The existing quality of the air, including other sources of contamination and their cumulative impact on air quality;

c) The potential for health risks caused by human exposure to waste constituents;

d) The prevailing wind patterns in the region and other site specific factors that may influence or cause adverse effects on air quality;

e) The potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; and

f) The persistence and permanence of the potential adverse effects.

2.4.5 Hazardous waste disposal sites shall be designed to prevent long term adverse effects on public health and the environment due to migration of waste constituents in the surface and subsurface environment, considering:

a) The volume and physical and chemical characteristics of the waste in the facility, including its potential for migration through soil;

b) The geologic characteristics of the facility and surrounding land and other site specific factors that may effect the potential for migration of waste constituents into surface and subsurface physical structures;

c) The potential for migration of waste constituents into the root zone of food-chain and other vegetation;

d) The potential for health risks caused by human exposure to waste constituents;

e) The potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; and

f) The persistence and permanence of the potential adverse effects.

2.4.6 The function and physical integrity of any liner emplaced in hazardous waste disposal sites to accomplish the design performance of the site shall be protected.

2.4.7 Any leachate and runoff control system shall be designed with sufficient capacity such that the design performance will comply with paragraphs 2.4.1, 2.4.2, 2.4.3, 2.4.4 and 2.4.5 of these regulations, considering:

a) The volume and types of leachate or contaminated runoff produced at the facility;

b) The climatic and hydrogeological conditions of the area; and

c) The available alternatives for managing any leachate or contaminated runoff produced.

2.4.8 The design of a hazardous waste disposal site and facility shall include a method for closure that will provide reasonable assurance of long-term compliance with paragraphs 2.4.1, 2.4.2, 2.4.4, 2.4.5, and 2.4.7 of these regulations, considering:

a) The types and amounts of waste in the facility, including the amount of free liquids;

b) The mobility and expected rates of migration of emplaced wastes;

c) The site location, topography, and surrounding land use;

d) Climatic conditions in the area;

e) The thickness, porosity and permeability of the cover proposed to be used, the slope and length of run of the slope, the final surface contours of the completed cover, and the types and durability of vegetation proposed to be placed on the cover;

f) Geological and soil profiles and the surface and subsurface hydrology of the site; and

g) The maintenance of any post-closure groundwater monitoring system and any leachate and runoff control system.

2.4.9 The design of a hazardous waste landfill, surface impoundment, or land treatment facility shall include systems for monitoring groundwater, surface water, and providing quality control of materials in construction. Such systems shall be sufficient to demonstrate via professionally accepted methods (e.g. those of the American Society of Testing Materials) that the design performance requirements of these regulations are satisfied.

2.4.10 The design of a hazardous waste disposal landfill, surface impoundment, or land treatment facility shall include procedures to be followed during construction, including supervision and certification by a professional geologist or professional engineer, to demonstrate that the facility is constructed in accordance with the design as approved.

6 CCR 1007-2.4

37 CR 17, September 10, 2014, effective 9/30/2014

37 CR 24, December 25, 2014, effective 1/14/2015

38 CR 11, June 10, 2015, effective 6/30/2015

38 CR 23, December 10, 2015, effective 12/30/2015

39 CR 23, December 10, 2016, effective 12/30/2016

39 CR 23, December 25, 2016, effective 12/30/2016

40 CR 05, March 10, 2017, effective 4/14/2017

40 CR 21, November 10, 2017, effective 1/1/2018

40 CR 21, November 10, 2017, effective 3/1/2018

41 CR 06, March 25, 2018, effective 4/14/2018

41 CR 11, June 10, 2018, effective 6/30/2018

41 CR 11, June 10, 2018, effective 7/15/2018

41 CR 24, December 25, 2018, effective 1/14/2019

42 CR 06, March 25, 2019, effective 4/14/2019

42 CR 11, June 10, 2019, effective 6/30/2019

42 CR 21, November 10, 2019, effective 11/30/2019

43 CR 06, March 25, 2020, effective 4/14/2020

43 CR 12, June 25, 2020, effective 7/15/2020

43 CR 18, September 25, 2020, effective 10/15/2020

43 CR 24, December 25, 2020, effective 1/14/2021

44 CR 24, December 25, 2021, effective 1/14/2022

45 CR 17, September 10, 2022, effective 9/30/2022

45 CR 23, December 10, 2022, effective 12/30/2022