Chapter 3. Criteria for All Waste Management Units, Facilities, and Disposal Sites
Article 3. CIWMB - Handling, Equipment and Maintenance
Section 20710. CIWMB - Scavenging, Salvaging, and Storage. (T14:Sections 17686, 17687, 17690, 17691)
(a) Scavenging is prohibited at any disposal site.
(b) Salvaging as approved by the EA shall be conducted in a planned and controlled manner and shall not interfere with other aspects of site operations, including the expeditious entry and egress of vehicles at the site.
(c) Salvaged materials generated on-site or imported shall be placed for storage in a specified, clearly identifiable area segregated from the working face. Salvaged materials shall be arranged so as to minimize risk of fire, health and safety hazard, vector harborage, or other hazard or nuisance, and be limited to a volume and storage time as approved by the enforcement agency.
Section 20720. CIWMB - Non-Salvageable Items. (T14:Section 17692)
Drugs, cosmetics, foods, beverages, hazardous chemicals, poisons, medical wastes, syringes, needles, pesticides and other materials capable of impairing public health shall not be salvaged unless approved by the EA and the local health agency.
Section 20730. CIWMB - Volume Reduction and Energy Recovery. (T14:Sections 17688, 17689)
Volume reduction such as incineration, baling, shredding, composting, pyrolysis, and materials and energy recovery operations as approved by the EA shall be confined to specified, clearly identifiable areas of the site. If volume reduction is conducted operations shall be done in a controlled manner as an integral part of the operation and not interfere with the proper construction and maintenance of the site or create health, safety, or environmental problems.
Section 20740. CIWMB - Equipment. (T14:Sections 17693, 17694)
Equipment shall be adequate in type, capacity and number, and sufficiently maintained to permit the site operation to meet requirements of these standards.
Section 20750. CIWMB - Site Maintenance. (T14:Sections 17695, 17696)
The operator shall implement a preventative maintenance program to monitor and promptly repair or correct deteriorated or defective conditions with respect to requirements of the CIWMB standards, and conditions established by the EA. All other aspects of the disposal site shall be kept in a state of reasonable repair.
Article 4. CIWMB - Controls
Section 20760. CIWMB - Nuisance Control. (T14:Section 17701)
Each disposal site shall be operated and maintained so as not to create a public nuisance.
Section 20770. CIWMB - Animal Feeding. (T14:Section 17702)
Feeding of solid waste to animals which will be used for human consumption is prohibited on disposal sites. Grazing of livestock away from operating areas is permitted.
Section 20780. CIWMB - Open Burning and Burning Wastes. (T14:Sections 17258.24(b), 17703, 17741)
(a) Open burning of solid waste, except for the infrequent burning of agricultural wastes, silvicultural wastes, landclearing debris, diseased trees, or debris from emergency clean-up operations, is prohibited at all solid waste landfills.
(b) If burning wastes are received, they shall be deposited in a safe area and extinguished. If burning wastes have been placed in an active face, they shall be immediately excavated, spread and extinguished.
Section 20790. CIWMB - Leachate Control. (T14:Sections 17704, 17709)
The operator shall ensure that leachate is controlled to prevent contact with the public.
Section 20800. CIWMB - Dust Control. (T14:Section 17706)
The operator shall take adequate measures to minimize the creation of dust and prevent safety hazards due to obscured visibility.
Section 20810. CIWMB - Vector and Bird Control. (T14:Section 17707)
The operator shall take adequate steps to control or prevent the propagation, harborage or attraction of flies, rodents, or other vectors and to minimize bird problems.
Section 20820. CIWMB - Drainage and Erosion Control. (T14:Sections 17708, 17715)
(a) The drainage system shall be designed and maintained to:
(1) ensure integrity of roads, structures, and gas monitoring and control systems;
(2) prevent safety hazards; and
(3) prevent exposure of waste.
Section 20830. CIWMB - Litter Control. (T14:Section 17711)
Litter shall be controlled, routinely collected and disposed of properly. Windblown materials shall be controlled to prevent injury to the public and personnel. Controls shall prevent the accumulation, or off-site migration, of litter in quantities that create a nuisance or cause other problems.
Section 20840. CIWMB - Noise Control. (T14:Section 17712)
Noise shall be controlled to prevent health and safety hazards to persons using the site and to nearby residents.
Section 20860. CIWMB - Traffic Control. (T14:Section 17714)
Traffic flow into, on, and out of the disposal site shall be controlled to minimize the following:
(a) interference and safety problems with traffic on adjacent public streets or roads,
(b) on-site safety hazards, and
(c) interference with site operations.
Section 20870. CIWMB - Hazardous Wastes. (T14:Section 17742, 17258.20)
(a) Owners or operators of all MSWLF units must implement a program at the facility for detecting and preventing the disposal of regulated hazardous wastes as defined in 40 CFR Part 261 and polychlorinated biphenyls (PCB) wastes as defined in 40 CFR Part 761. This program must include, at a minimum:
(1) Random inspections of incoming loads unless the owner or operator takes other steps to ensure that incoming loads do not contain regulated hazardous wastes or PCB wastes;
(2) Records of any inspections;
(3) Training of facility personnel to recognize regulated hazardous wastes and PCB wastes; and
(4) Notification of the EA, the Director of the California Department of Toxic Substances Control (DTSC) or its delegated agent, and the Regional Water Quality Control Board ( RWQCB), if a regulated hazardous waste or PCB waste is discovered at the facility.
(b) A site shall not accept hazardous wastes unless the site has been approved for the particular waste involved.
(c) At sites where hazardous materials are processed, precautions must be taken to eliminate or control dusts, fumes, mists, vapors or gases that may be produced in quantities and under conditions which may have harmful effects on site personnel, the general public or animals.
Authority cited: Section 40502, Public Resources Code.
Reference: Sections 40508, 43020, 43021 and 43103, Public Resources Code, Sections 25249.5 through 25249.13, Health and Safety Code; and Title 40, Code of Federal Regulations, Section 258.20.
Section 20880. CIWMB - Medical Waste. (new)
Medical waste, unless treated and deemed to be solid waste, which is regulated pursuant to the Medical Waste Management Act [Part 14 (commencing with Section 117600) of Division 104 of the Health and Safety Code], shall not be accepted for disposal at a site.
Section 20890. CIWMB - Dead Animals. (T14:Section 17744)
Dead animals may be accepted if allowed by local regulations and shall be covered immediately or at a frequency approved by the EA.
Section 20900. CIWMB - Air Criteria. (T14:Sections 17258.24(a))
Owners or operators of all MSWLF's must ensure that the units do not violate any applicable requirements developed under a State Implementation Plan (SIP) approved or promulgated by the Administrator, United States Environmental Protection Agency, pursuant to section 110 of the Clean Air Act, as amended.
Article 5. CIWMB - Fire Control at Active and Closed Disposal Sites
Section 20905. CIWMB - [Reserved]
CIWMB - [Reserved]
Section 20915. CIWMB - Subsurface Fire Control. [Reserved]
CIWMB - Subsurface Fire Control. [Reserved]
Article 6. Gas Monitoring and Control at Active and Closed Disposal Sites
Section 20917. CIWMB - Scope and Applicability. [Reserved]
CIWMB - Scope and Applicability. [Reserved]
Section 20918. CIWMB - Exemptions.
A disposal site other than a MSWLF unit may be granted an exemption to all or any portion of the requirements of Article 6 of this Subchapter if the operator can demonstrate to the satisfaction of the EA that there is no potential for adverse impacts on public health and safety and the environment, based upon but not limited to: the amount, nature and age of refuse; projected landfill gas generation; and remoteness of the disposal site. Exemptions shall be reviewed by the EA at least every five (5) years and in conjunction with the five (5) year permit review for those sites which have a solid waste facilities permit, and, based on the results, the EA may extend or terminate the exemption. Any exemption granted by the EA shall be in writing and shall contain sufficient relevant information that justifies the exemption.
Section 20919. CIWMB - Gas Control.
Where the EA, the local fire control authority, the local building authority, or the CIWMB has sufficient relevant information to believe a hazard or nuisance is being or may be created by landfill gas, it shall so notify the operator. The local fire control authority and the local building authority shall also notify the EA and the CIWMB. Thereafter, as directed by the EA, the local fire control authority, the local building authority, or the CIWMB, the site operator shall cause the site to be monitored for presence and movement of landfill gas, and shall take necessary action to control such gas. The monitoring program shall be developed pursuant to the specifications of the above agencies. The monitoring program shall not be discontinued until authorized to do so in writing by the requiring agency. Results of the monitoring shall be submitted to the appropriate agencies. If monitoring indicates landfill gas movement away from the site, the operator shall, within a period of time specified by the requiring agency, construct a gas control system approved by that agency. The agency may waive this requirement if satisfactory evidence is presented demonstrating that adjacent properties are safe from hazard or nuisance caused by landfill gas movement. The operator shall duly inform the EA of possible landfill gas problems.
Section 20919.5 CIWMB - Explosive Gases Control. [Repealed]
Section 20920. CIWMB - Scope and Applicability for Gas Monitoring and Control Requirements.
(a) Sections 20921 through 20939 set forth the performance standards and the minimum substantive requirements for landfill gas monitoring and control as it relates to active solid waste disposal sites and to proper closure, postclosure maintenance and ultimate reuse of solid waste disposal sites to assure that public health and safety and the environment are protected from pollution due to the disposal of solid waste.
(b) Sections 20921 through 20939 apply to all of the following:
(1) Active solid waste disposal sites;
(2) Solid waste disposal sites that did not commence complete closure prior to August 18, 1989, which was fully implemented by November 18, 1990, in accordance with all applicable requirements; and
(3) New postclosure activities at any solid waste disposal site that may jeopardize the integrity of a previously closed site or pose a threat to public health and safety or the environment..
Section 20921. CIWMB - Gas Monitoring and Control.
(a) To provide for the protection of public health and safety and the environment, the operator shall ensure that landfill gas generated at a disposal site is controlled in such a manner as to satisfy the following requirements:
(1) The concentration of methane gas must not exceed 1.25 percent by volume in air within any portion of any on-site structures.
(2) The concentration of methane gas migrating from the disposal site must not exceed 5 percent by volume in air at the disposal site permitted facility boundary or an alternative boundary approved in accordance with Section 20925.
(3) Trace gases shall be controlled to prevent adverse acute and chronic exposure to toxic and/or carcinogenic compounds.
(b) The EA shall evaluate and, if it complies with the requirements of Sections 20921-20939 to the satisfaction of the EA, approve a gas monitoring and control program plan submitted by the disposal site operator. The EA shall act upon the submittal by approving, denying, or requesting additional information within 60 days of receipt of the submittal. Within 5 days from the date of approval, the EA shall submit the approved gas monitoring and control program plan to the CIWMB. The CIWMB shall evaluate and, if it complies with the requirements of Sections 20921-20939 to the satisfaction of the CIWMB, concur with a gas monitoring and control program plan submitted by the EA. The CIWMB shall act upon the submittal by concurring, denying, or requesting additional information within 60 days of receipt of the submittal; if the CIWMB does not act upon the submittal within 60 days, the submittal will be deemed to have been concurred with.
(1) New disposal sites and lateral expansions of existing disposal sites shall comply with these regulations prior to receipt of waste in the new or expanded area.
(2) Except as provided in subdivision (A) hereof, disposal sites which have received their final shipment of waste shall comply with these regulations immediately.
(A) Disposal sites for which the EA, RWQCB, and CIWMB approved a final closure plan on or before September 20, 2007 shall comply with these regulations immediately, except that Section 20925(c)(1) only applies with respect to any new wells or probes that are installed or existing wells or probes that are modified and only when such wells or probes are installed or modified. The depth of these new wells and modified existing wells shall comply with Section 20925(c)(1), unless an alternative depth is approved pursuant to Section 20925(c)(2).
(3) Existing disposal sites which have not yet received their final shipment of waste shall comply with these regulations in accordance with the following schedule.
(A) Disposal sites which are permitted to receive greater than 20 tons of waste per operating day shall:
(i) submit gas monitoring and control program plans to the EA by September 21, 2008,
(ii) fully implement the programs described in the EA-approved and CIWMB-concurred program plans by October 18, 2009.
(iii) Notwithstanding subdivision (ii) of this paragraph (b)(3)(A), the CIWMB, after consultation with the EA, may extend the date for full implementation of an approved program at a disposal site if it determines that the operator has made a good faith effort to achieve timely implementation but has been unable to complete the implementation of the program plan by the implementation date specified in subdivision (ii) for reasons beyond its control. An operator may apply for an extension by submitting to the CIWMB a written justification for the extension and its schedule for achieving full implementation. During an extended term for full implementation as approved by the CIWMB, the EA shall not find the operator in violation of subdivision (ii) nor commence an enforcement action respecting the operator's failure to fully implement its gas monitoring and control program plan by the date specified in subdivision (ii) with respect to those aspects of the program plan for which the CIWMB has granted an extension.
(B) Disposal sites which are permitted to accept less than or equal to 20 tons of waste per operating day shall:
(i) submit gas monitoring and control program plans to the EA by September 21, 2009,
(ii) fully implement the programs described in the EA-approved and CIWMB-concurred program plans by September 21, 2010.
(iii) Notwithstanding subdivision (ii) of this paragraph (b)(3)(B), the CIWMB, after consultation with the EA, may extend the date for full implementation of an approved program at a disposal site if it determines that the operator has made a good faith effort to achieve timely implementation but has been unable to complete the implementation of the program plan by the implementation date specified in subdivision (ii) for reasons beyond its control. An operator may apply for an extension by submitting to the CIWMB a written justification for the extension and its schedule for achieving full implementation. During an extended term for full implementation as approved by the CIWMB, the EA shall not find the operator in violation of subdivision (ii) nor commence an enforcement action respecting the operator's failure to fully implement its gas monitoring and control program plan by the date specified in subdivision (ii) with respect to those aspects of the program plan for which the CIWMB has granted an extension.
(c) The gas monitoring and control program implemented pursuant to Sections 20921-20939 shall continue until the operator receives written authorization to discontinue by the EA with concurrence by the CIWMB pursuant to 40 CFR 258.61(b). Authorization to cease gas monitoring and control shall be based on a demonstration by the operator that there is no potential for gas migration beyond the disposal site permitted facility boundary or into on-site structures. The operator's demonstration of this proposal shall be supported by data collected and any necessary studies.
(d) The gas monitoring and control program required pursuant to Sections 20921-20939, shall be included in the JTD and preliminary and final closure and postclosure maintenance plans. The implementation of the gas monitoring and control program shall be described in detail in the JTD and the preliminary and final closure and postclosure maintenance plans to the satisfaction of the EA and CIWMB.
(e) The gas monitoring and control program shall be modified, during the operation and closure and postclosure maintenance periods to reflect changing on-site and adjacent land uses. Postclosure land use at the site shall not interfere with the function of gas monitoring and control systems. The operator may request a reduction of monitoring or control activities based upon the results of monitoring data collected. The request for reduction of monitoring or control activities shall be submitted in writing to the EA and CIWMB.
(f) For the purposes of this article, for disposal sites that do not have a solid waste facilities permit, the disposal site permitted facility boundary shall be as defined in the most recently approved closure and/or postclosure maintenance plan or other appropriate document (e.g., assessor's parcel map).
Section 20923. CIWMB - Monitoring
(a) To ensure that the conditions of Section 20921 are met, the operator shall implement a gas monitoring and control program at the disposal site that satisfies the following requirements:
(1) the gas monitoring network shall be designed by a registered civil engineer or a certified engineering geologist and shall ensure detection of the presence of landfill gas migrating beyond the disposal site permitted facility boundary and also into on-site structures; and
(2) The monitoring network shall be designed to account for the following specific site characteristics and potential migration pathways or barriers, including, but not limited to:
(A) local soil and rock conditions;
(B) hydrogeological conditions at the disposal site;
(C) the hydraulic conditions surrounding the disposal site;
(D) locations of buildings and structures relative to the waste disposal area;
(E) adjacent land use and inhabitable structures within 1000 feet of the disposal site permitted facility boundary;
(F) man-made pathways, such as underground construction; and
(G) the nature and age of the waste and its potential to generate landfill gas.
See Title 14 for 4. points of history.
Section 20925. CIWMB - Perimeter Monitoring Network.
(1) Perimeter subsurface monitoring wells shall be installed around the waste disposal footprint but not within refuse. In some cases the installation of monitoring wells may not be necessary around the entire perimeter of the disposal site permitted facility boundary. In such a case, the operator shall demonstrate to the satisfaction of the EA that landfill gas migration could not occur due to geologic barriers and that no inhabitable structure or other property or land use, such as agricultural lands, within 1,000 feet of the disposal site permitted facility boundary is threatened by landfill gas migration.
(2) Perimeter monitoring wells shall be located at or near the disposal site permitted facility boundary. The operator may establish an alternate boundary closer to the waste disposal footprint based on a knowledge of the site factors in Section 20923(a)(2). When compliance levels are exceeded at the alternate boundary, the operator shall install additional monitoring wells closer to the permitted facility boundary, pursuant to Section 20937.
(1) The lateral spacing between adjacent monitoring wells shall not exceed 1,000 feet unless the operator demonstrates to the satisfaction of the EA and CIWMB, based on the factors specified in Section 20923(a) (2), that there is no potential for adverse impacts on the public health and safety and the environment from such wider spacing.
(2) The spacing of monitoring wells shall be determined based upon, but not limited to: the nature of the structure to be protected and its proximity to the refuse. Wells shall be spaced to align with gas permeable structural or stratigraphic features, such as dry sand or gravel, off site or on site structures, and areas of dead or stressed vegetation that might be caused by landfill gas migration.
(3) Monitoring well spacing shall be reduced as necessary to protect persons and structures threatened by landfill gas migration.
(1) The depth of the wellbore of all monitoring wells shall equal the maximum depth of waste. The number and depths of monitoring probes within the wellbore shall be installed in accordance with the following criteria, except as specified in ¶(c)(2) of this section.
(A) a shallow probe shall be installed 5 to 10 feet below the surface;
(B) an intermediate probe shall be installed at or near half the depth of the waste;
(C) a deep probe shall be set at or near the depth of the waste;
(D) the specified depths of monitoring probes within the wellbore shall be adjusted based on geologic data obtained during drilling, and probes shall be placed adjacent to soils which are most conducive to gas flow;
(E) All probes shall be installed above the permanent low seasonal water table, above and below perched ground water, and above bedrock; and
(F) When the depth of the waste does not exceed 30 feet, the operator may reduce the number of probes to two, with one probe located in the shallow zone as indicated above and the other located adjacent to permeable soils at or near the depth of the waste.
(2) Exclusions or modifications to the requirements specified in ¶(c)(1) of this section may be requested when conditions limit the practicality or do not warrant the installation depth criteria (e.g., filled pits, cut and trench, and canyon fills). In those cases, the operator shall propose an alternate system of equivalent probe depths. The proposal must demonstrate to the satisfaction of the EA and CIWMB that probes located at these depths are sufficient to detect migrating landfill gas and provide protection to public health and safety and the environment.
(3) The EA may require an increase in the number of monitoring wells or probes or the depth of the wellbore or modify the depths of monitoring probes within a wellbore to ensure compliance with Section 20921(a). The operator is not precluded from utilizing existing gas monitoring wells of an alternate design when the operator demonstrates to the satisfaction of the EA and CIWMB that such wells have been installed in a manner that ensures the detection of landfill gas migrating from the disposal site.
(d) Monitoring Well Construction
(1) Monitoring wells shall be drilled by a licensed drilling contractor or by a drilling crew under the supervision of the design engineer or engineering geologist. Wells shall be logged during drilling by a geologist or geotechnical engineer. Soils shall be described using the ASTM Designation: D2488-84 method for visual classification, Standard Practice for Description and Identification of Soils (Visual Manual Procedure), which is incorporated by reference. Rock units shall be described in a manner appropriate for geologic investigation.
(2) A record of each monitoring well shall be maintained by the operator and submitted to the EA upon request. The record shall include:
(A) a map of the disposal site drawn to a scale proposed by the design engineer or engineering geologist sufficient to show the location of all monitoring wells. Each well must be identified with a number that corresponds to the well log. Surface elevations at the wellheads shall be denoted on the map;
(B) well logs, including the names of the person(s) logging the hole; and
(C) an as-built description, including a well detail which indicates probe material and depth, extent and type of filter pack, thickness and material used for seals, extent and material used for backfill, size and interval of perforations, and a description of any shutoff valves or covers.
(3) To isolate monitored zones within the wellbore and prevent contamination of perched ground water and permanent ground water, the operator shall provide a minimum seal of five (5) feet of bentonite at the surface and between the monitored zones.
Section 20931. CIWMB - Structure Monitoring.
(a) To ensure that the requirements of Section 20923(a)(1) are met, the monitoring network design shall include provisions for monitoring all structures within the disposal site permitted facility boundary, including but not limited to, buildings, subsurface vaults, utilities, or any other areas where potential landfill gas buildup may cause adverse impacts to the public health or safety or the environment.
(b) Methods for monitoring on-site structures may include, but are not limited to: periodic monitoring, utilizing either permanently installed monitoring probes or gas surveys, and continuous monitoring systems.
(c) Structures located on top of the waste disposal footprint shall be monitored on a continuous basis.
(d) When practical, structures shall be monitored after they have been closed overnight or for the weekend to allow for an accurate assessment of gas accumulation. Areas of the structure where gas may accumulate shall be monitored and may include, but are not limited to, areas in, under, beneath and around basements; crawl spaces; floor seams or cracks; and subsurface utility connections.
Section 20932. CIWMB - Monitored Parameters.
(a) All monitoring wells and on-site structures shall be monitored for methane during the monitoring period. The EA may require that a sample be collected for laboratory analysis for specified trace gases when there is a possibility of acute or chronic exposure due to hazardous materials.
Section 20933. CIWMB - Monitoring Frequency.
(a) At a minimum, quarterly monitoring is required.
(1) The EA may require more frequent monitoring based upon site specific factors, including those noted in Section 20923(a)(2), or as needed to protect public health or safety or the environment.
(2) More frequent monitoring may also be required at those locations where results of monitoring indicate that landfill gas migration is occurring or is accumulating in structures.
(3) The operator shall increase the monitoring frequency, as is necessary, to detect migrating gas and ensure compliance with Section 20921.
(b) For those MSWLF's that are permitted to accept for disposal 20 tons or less of municipal solid waste per day based on an annual average, the EA, with concurrence by the CIWMB, may reduce the frequencies for monitoring landfill gas after consideration of the unique characteristics of the MSWLF and its surroundings, climatic and hydrogeologic conditions, and protection of public health and safety and the environment. Any proposal by an operator for a reduced monitoring frequency shall be made available by the EA for public review for a minimum of 30 days to allow interested persons the opportunity to comment. The operator shall place in the operating record of the MSWLF documentation of the considerations, public comment, and EA approval and CIWMB concurrence for any alternative frequency. No reduced monitoring frequency shall be approved unless the EA and the CIWMB determine that the alternative monitoring schedule adequately protects the public health and safety and the environment. The Executive Director or the EA may condition, limit, suspend, or terminate an operator's use of an alternative monitoring frequency if s/he or it determines that the alternative frequency may cause harm to public health and safety or the environment.
Section 20934. CIWMB - Reporting
(a) Provided that the results of landfill gas monitoring demonstrate that none of the monitoring wells show gas concentrations in excess of the requirements specified in Section 20921(a), the operator shall submit the results to the EA within a time period specified by the EA but no more than within ninety (90) days of sampling. When compliance requirements are exceeded in any probe at any well, the requirements of Section 20937 shall apply. The monitoring reports shall include:
(1) the concentrations of methane, as measured at each probe within each well and within each on-site structure;
(2) the concentrations of specified trace gases, if required by the EA;
(3) the documentation of date, time, barometric pressure, atmospheric temperatures, general weather conditions, and probe pressures at the time the sample was taken or the probe was monitored;
(4) the names of sampling personnel, apparatus utilized, and a brief description of the methods used; and
(5) a numbering system to correlate monitoring results to a corresponding well and probe location.
Section 20937. CIWMB - Reporting and Control of Excessive Gas Concentrations.
(a) When the results of landfill gas monitoring indicate concentrations of methane or trace gases in excess of the compliance requirements specified in Section 20921(a), the operator shall:
(1) Immediately take all steps necessary to protect public health and safety and the environment and notify the EA by telephone or electronic means.
(2) Within seven (7) days of detection of excessive landfill gas concentrations.
(A) Verify validity of results by reviewing the following:
(i) probe readings;
(ii) possible liquid interference;
(iii) control well influence; and
(iv) barometric pressure effects.
(B) Place in the operating record a description of and submit a letter to the EA that describes:
(i) the levels of methane and trace gas detected;
(ii) a brief description of the nature and extent of the problem based on information currently available;
(iii) the steps the operator has taken to protect public health and safety and the environment; and
(iv) a brief description of any further corrective actions that the operator or others need to take to adequately protect public health and safety and the environment prior to the implementation of the remediation plan described in subdivision (a)(3) below.
(3) Within 60 days of detection, implement a remediation plan approved by the EA and CIWMB for the methane gas releases, place a copy of the plan in the operating record, forward a copy of the plan to the EA and CIWMB, and notify the EA that the plan has been implemented. The plan shall describe the nature and extent of the problem and the proposed remedy.
(4) Construct a gas control system that meets the criteria of Section 20939, designed by a registered civil or mechanical engineer, within a period of time specified by the EA. Installation of the system shall be in accordance with a design and in a manner approved for construction by the EA in coordination, if applicable, with the RWQCB.
(b) The EA, with concurrence by the CIWMB, may establish an alternative schedule for demonstrating compliance with subdivisions (a)(2) and (3) pursuant to 40 CFR 258.23(c)(4).
(c) The EA shall forward notifications and approvals made pursuant to ¶¶(a)(1), (2) and (3) to the CIWMB.
Section 20939. CIWMB - Control of Excessive Gas Concentrations
(a) A landfill gas control system shall be designed to:
(1) Prevent methane accumulation in on-site structures from exceeding the level specified in Section 20921(a);
(2) Reduce methane concentrations at the disposal site permitted facility boundary to the level specified in Section 20921(a);
(3) Reduce trace gas concentrations to the requirement specified in Section 20921(a); and
(4) Provide for the collection, treatment, and disposal of landfill gas condensate produced within the disposal site. Condensate generated from landfill gas control systems shall not be recirculated into the landfill unless the landfill has a liner and a properly operating leachate collection and removal system and analysis of the condensate demonstrates, to the satisfaction of the EA, that such recirculation into the landfill will not harm the public health or safety or the environment and the applicable RWQCB has approved such discharge pursuant to Section 20200(d).
(b) Subsurface landfill gas control systems may include, but are not limited to, one or more of the following:
(1) Active perimeter or interior control systems which are designed to accommodate the maximum expected flow rate from the disposal site and provide access for system monitoring and flow rate adjustment. The control system shall be operated to ensure that gas is controlled at a sufficient rate without overpulling, to maximize control and not production, and to ensure adequate control for compliance with Section 20921(a).
(2) Perimeter air injection systems which shall be installed in native soil between the refuse and the area to be protected. Injection wells shall not be located in the refuse. The system shall be designed and operated to prevent air infiltration into the landfill but maintain landfill gas concentrations to compliance levels.
(3) Passive systems, including cutoff trenches, slurry walls, and vent trenches, when used shall be constructed with an impermeable geomembrane liner. The passive systems shall be installed to the depth of permanent low seasonal ground water or keyed into a low permeability layer below the limit of migration.
(c) Landfill gas control measures to protect structures and public health and safety shall include one or more of the following:
(1) Flexible membrane liners,
(2) Active collection systems,
(3) Passive collection systems designed to be upgraded to an active system,
(5) Ignition source control,
(6) Utility collars installed within structures and outside in trenches, and
(d) To ensure that the landfill gas control system is operating at optimum efficiency to control landfill gas, the operator shall provide for system monitoring and adjustment.
(e) To provide for the safe, efficient operation of the landfill gas control system, the operator shall implement a maintenance program in accordance with the following requirements:
(1) A site-specific operations and maintenance manual shall be maintained and kept current to reflect any expansion or modifications to the gas control system;
(2) An operations and maintenance manual shall provide for periodic inspections and servicing of gas control equipment; and
(3) Operations and maintenance shall be recorded and the records shall be retained by the operator.
(f) Construction Quality Assurance/Quality Control
(1) The operator shall be responsible for providing inspections, as needed, to ensure the integrity of the system.
(2) Prior to construction, the designer shall obtain and review all applicable test reports, shop drawings, and manufacturers certificates to verify that all equipment used or to be used in the gas control system has been manufactured in accordance with industry standards.
Section 20945. [Reserved by SWRCB]
[Reserved by SWRCB]