1150.1 - 1 

(Adopted April 5, 1985)(Amended April 10, 1998) 

(Amended March 17, 2000)(Amended April 1, 2011) 

RULE 1150.1. CONTROL OF GASEOUS EMISSIONS FROM MUNICIPAL 

SOLID WASTE LANDFILLS 

(a) Purpose 

The purpose of this rule is to reduce non-methane organic compounds (NMOC), 

volatile organic compound (VOC) and toxic air contaminant (TAC) emissions 

from Municipal Solid Waste (MSW) landfills to prevent public nuisance and 

possible detriment to public health caused by exposure to such emissions. This 

rule also reduces methane emissions, a greenhouse gas. 

(b) Applicability 

This rule is applicable to any owner or operator of an active or inactive MSW 

landfill. 

(c) Definitions 

For the purpose of this rule, the following definitions shall apply: 

(1) ACTIVE COLLECTION SYSTEM as defined by 40 CFR 60.751 means a 

gas collection system that uses gas mover equipment. 

(2) ACTIVE MSW LANDFILL means a Municipal Solid Waste landfill that 

has received solid waste on or after November 8, 1987. 

(3) BACKGROUND means the local ambient concentration of total organic 

compounds (TOC) measured as methane determined by holding the 

instrument probe approximately 5 to 6 feet above the landfill surface. 

(4) CLOSED MSW LANDFILL means a Municipal Solid Waste landfill that 

has ceased accepting solid waste for disposal and was conducted in 

accordance with all applicable federal, state and local statutes, regulations, 

and ordinances in effect at the time of closure. 

(5) COMPONENT LEAK means the concentration of methane measured one 

half an inch or less from a component source that exceeds 500 parts per 

million by volume (ppmv), other than non-repeatable, momentary 

readings. 

(6) COMPONENT means any equipment that is part of the gas collection 

system or gas control system and that contains landfill gas including, but 
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not limited to, wells, pipes, flanges, fittings, valves, flame arresters, 

knock-out drums, sampling pots, blowers, compressors, or connectors. 

(7) CONSTRUCTION AND DEMOLITION WASTE means waste building 

materials, packing and rubble resulting from construction, remodeling, 

repair and demolition operations on pavements, houses, commercial 

building and other structures. 

(8) CONTINUOUS OPERATION means that the gas collection and gas 

control systems are operated continuously, the existing gas collection 

wells are operating under vacuum while maintaining landfill gas flow, and 

the collected landfill gas is processed by a gas control system 24 hours per 

day. 

(9) DESTRUCTION EFFICIENCY means a measure of the ability of a gas 

control device to combust, transform, or otherwise prevent emissions of 

methane from entering the atmosphere. 

(10) ENCLOSED COMBUSTOR means an enclosed flare, steam generating 

boiler, internal combustion engine or gas turbine. 

(11) ENERGY RECOVERY DEVICE means any combustion device that uses 

landfill gas to recover energy in the form of steam or electricity including, 

but not limited to gas turbines, internal combustion engines, boilers, and 

boiler-to-steam turbine systems. 

(12) EXECUTIVE OFFICER means the Executive Officer or designee of the 

South Coast Air Quality Management District 

(13) GAS COLLECTION SYSTEM means any system that employs various 

gas collection wells and connected piping and mechanical blowers, fans, 

pumps or compressors to create a pressure gradient and actively extract 

landfill gases. 

(14) GAS CONTROL DEVICE means any device used to dispose of or treat 

collected landfill gas including, but not limited to, enclosed flares, open 

flares, internal combustion engines, boilers and boiler-to-steam systems, 

process heaters, fuel cells, and gas turbines. 

(15) GAS CONTROL SYSTEM means any system that disposes of or treats 

collected landfill gas by one or more of the following means: combustion, 

gas treatment for subsequent sale, or sale for processing offsite, including 

for transportation fuel and injection into natural gas pipelines. 

(16) INACTIVE MSW LANDFILL means a Municipal Solid Waste landfill 

that has not accepted solid waste after November 8, 1987 and 
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subsequently no further solid waste disposal activity has been conducted 

within the disposal facility. 

(17) LANDFILL GAS means any untreated, raw gas derived through a natural 

process from the decomposition of organic waste deposited in a MSW 

landfill from the evolution of volatile species in the waste, or from 

chemical reactions of substances in the waste. 

(18) LANDFILL SURFACE means the area of the landfill under which 

decomposable solid waste has been placed, excluding the working face. 

(19) MUNICIPAL SOLID WASTE or MSW LANDFILL means an entire 

disposal facility in a contiguous geographical space where solid waste is 

placed in or on land. An MSW landfill may be active, inactive or closed. 

(20) NON-DECOMPOSABLE SOLID WASTE means materials that do not 

degrade biologically to form landfill gases. Examples include, but are not 

limited to, earth, rock, concrete, asphalt, paving fragments, clay products, 

inert slag, asbestos-containing waste, and demolition material containing 

minor amounts (less than 10 percent by volume) of wood and metals. 

Materials that do not meet this definition are considered decomposable 

solid waste. 

(21) NON-REPEATABLE MOMENTARY READINGS means indications of 

the presence of methane, total organic compounds, or toxic air 

contaminants, which persist for less than five seconds and do not recur 

when the sampling probe of a portable gas detector is placed in the same 

location. 

(22) OPERATOR means the person: 

(A) Operating the MSW landfill, or 

(B) Operating the MSW landfill gas collection or gas control system. 

(23) OWNER means the person holding title to the property. 

(24) PASSIVE COLLECTION SYSTEM means a gas collection system that 

solely uses positive pressure within the landfill to move the gas rather than 

using gas mover equipment, or uses the natural pressure gradient 

established between the encapsulated waste and the atmosphere to move 

the gas through the collection system. 

(25) PERIMETER means the outer boundary of the entire waste disposal 

property. 

(26) PROFESSIONAL ENGINEER means an engineer holding a valid 

certificate issued by the State of California Board of Registration for 
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Professional Engineers and Land Surveyors or a state offering reciprocity 

with California. 

(27) SOLID WASTE means all decomposable and non-decomposable solid, 

semisolid and liquid wastes including garbage, trash, refuse, paper, 

rubbish, ashes, industrial waste, manure, vegetable or animal solid and 

semisolid waste. Solid waste also includes any material meeting the 

definition of solid waste in 40 CFR 60.751 (as last amended by 64 Fed. 

Reg. 9262, Feb. 24, 1999), as incorporated by reference herein. 

(28) SUBSURFACE GAS MIGRATION means underground landfill gases 

that are detected at any point on the perimeter, pursuant to California Code 

of Regulation Title 27, section 20921. 

(29) TOXIC AIR CONTAMINANT (TAC) means an air contaminant which 

has been identified as a hazardous air pollutant pursuant to Section 7412 

of Title 42 of the United States Code; or has been identified as a TAC by 

the Air Resources Board pursuant to Health and Safety Code Section 

39655 through 39662, or which may cause or contribute to an increase in 

mortality or an increase in serious illness, or potential hazard to human 

health. 

(30) WASTE IN PLACE means the total amount of solid waste placed in an 

MSW landfill, estimated in tons. The refuse density is assumed to be 

1,300 pounds per cubic yard and the decomposable fraction is assumed to 

be 70 percent by weight. 

(31) WELL RAISING means a MSW landfill activity where an existing gas 

collection well is temporarily disconnected from a vacuum source; and the 

non-perforated pipe attached to the well is extended vertically to allow the 

addition of a new layer of solid waste or the final cover or is extended 

horizontally to allow extension of an existing layer of solid waste or cover 

material. The extended pipe is then reconnected to vacuum source in 

order to continue collecting gases from that well. 

(32) WORKING FACE means that open area where solid waste is deposited 

daily and compacted with landfill equipment. 

(d) Active Landfill Design and Operation Requirements 

The MSW landfill owner or operator shall comply with the provisions of 

paragraphs (d)(1) through (d)(20): 
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(1) If a valid Permit to Construct or Permit to Operate for the gas collection 

and gas control systems that meets the requirements of subparagraphs 

(d)(1)(A) through (d)(1)(C) has not been issued by the District, the owner 

or operator shall submit a site-specific gas collection and gas control 

systems design plan. The design plan shall be prepared by a Professional 

Engineer and submitted to the Executive Officer with applications for 

Permits to Construct or Permits to Operate for the gas collection and gas 

control systems. The Executive Officer shall review the gas collection and 

gas control systems design and either approve it, disapprove it, or request 

that additional information be submitted. An approved design plan may 

be revised and submitted for review and approval by the Executive 

Officer. Revisions shall be prepared by a Professional Engineer. 

(A) The gas collection and gas control systems shall be designed to 

handle the maximum expected gas flow rate from the entire area of 

the MSW landfill that requires control, to minimize migration of 

subsurface gas to comply with paragraph (d)(10), and to collect gas 

at an extraction rate to comply with paragraphs (d)(11) and (d)(12). 

For the purposes of calculating the maximum expected gas 

generation flow rate from the landfill, the 2006 Intergovernmental 

Panel on Climate Change Guidelines for National Greenhouse Gas 

Inventories, Chapter 3 (IPCC Model), using landfill gas capture 

factor of 75 percent shall be used. Any other method used to 

determine the maximum gas generation flow rate, must be 

submitted in writing and approved by the Executive Officer, prior 

to use. 

(B) If a valid Permit to Construct or Permit to Operate has not been 

issued by the District for the gas collection and gas control 

systems, the gas collection and gas control systems design plan 

shall either conform with specifications for active collection 

systems in 40 CFR, Part 60, Section 60.759 or include a 

demonstration to the Executive Officer’s satisfaction of the 

sufficiency of the alternative provisions describing the design and 

operation of the gas collection and gas control systems, the 

operating parameters that would indicate proper performance, and 

appropriate monitoring procedures. Alternatives to this rule shall 

be submitted as specified in subdivision (i). 
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(C) The design plan shall provide for the control of collected MSW 

landfill emissions through the use of gas collection and gas control 

systems meeting the applicable requirements in clauses 

(d)(1)(C)(i), (d)(1)(C)(ii), (d)(1)(C)(iii), and (d)(1)(C)(iv), or 

provide for the collection and subsequent sale of collected MSW 

landfill emissions as specified in clause (d)(1)(C)(v). 

(i) Route all collected landfill gas to a gas control system 

designed to be operated continuously to reduce methane by 

at least 99 percent by weight and reduce NMOC by at least 

98 percent by weight or reduce the outlet NMOC 

concentration to less than 20 parts per million by volume 

(ppmv), dry basis as hexane at 3 percent oxygen. The 

required reduction efficiency or ppmv shall be established 

by an initial source test, required under 40 CFR, Part 60, 

Section 60.8 and annually thereafter using the test methods 

specified in paragraph (j)(1). The annual source test shall 

be conducted no later than 45 days after the anniversary 

date of the initial source test. 

(ii) If an enclosed flare is used as the gas control device, the 

following requirements shall be met: 

(I) The enclosed flare shall achieve a methane 

destruction efficiency of at least 99 percent by 

weight. 

(II) The enclosed flare shall be equipped with an 

automatic damper, an automatic shutdown device, a 

flame arrestor, and a continuous recording 

temperature sensor. 

(III) During restart or startup, an enclosed flare shall 

have sufficient flow of propane or commercial 

natural gas to the burners to prevent unburned 

collected methane from being emitted to the 

atmosphere. 

(IV) The enclosed flare shall be operated within the 

parameter ranges established during the initial or 

the most recent source test. The operating 
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parameters to be monitored are specified in 

paragraph (e)(7). 

(iii) If an open flare is used as the gas control device, the 

following requirements shall be met: 

(I) An open flare installed and operated prior to August 

1, 2008 may operate until January 1, 2018. 

(II) Operation of an open flare on or after January 1, 

2018 may be allowed if the owner or operator can 

demonstrate to the Executive Officer that the 

landfill gas heat input capacity is less than 3.0 

MMBtu/hr and is insufficient to support the 

continuous operation of an enclosed flare or other 

gas control device. 

(III) The owner or operator seeking to temporarily 

operate an open flare during the maintenance or 

repair of a gas control system or while waiting for

the installation on an enclosed flare or to offset gas 

mitigation issues must submit a written request to 

the Executive Officer and operate an open flare only 

after approval. 

(iv) If a gas control device is an enclosed combustor other than 

a flare and is used as a gas control device, the following 

requirements shall be met: 

(I) The gas control device shall achieve a methane 

destruction efficiency of at least 99 percent by 

weight. Lean burn combustion engines shall reduce 

the outlet methane concentration to less than 3,000

ppmv, dry basis, corrected to 15 percent oxygen. 

(II) If a boiler or process heater is used as the gas 

control device, the landfill gas stream shall be 

introduced into the flame zone. Where the landfill

gas is the primary fuel for the boiler or process 

heater, introduction of the landfill gas stream into 

the flame zone is not required. 

(III) The gas control device shall be operated within the 

operating parameter ranges established during the 
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initial or most recent compliant source test. The 

operating parameters to be monitored are specified 

in paragraph (e)(7). 

(v) Route the collection gas to a treatment system that 

processes the collection gas for subsequent sale or use. All 

emissions from any atmospheric vent from the gas 

treatment system shall be subject to requirements of clause 

(d)(1)(C)(i). 

(2) New and Active MSW Landfills shall install and operate the gas collection 

and gas control systems no later than 18 months after the submittal of the 

design plan. 

(3) Any owner or operator of existing gas collection and gas control systems 

who modifies those systems to meet the requirements of this rule shall 

submit for approval to the Executive Officer an amendment of the existing 

design plan to include any necessary updates or addenda. Design plan 

amendments shall be prepared by a professional engineer. 

(4) The owner or operator of a closed or inactive landfill shall install and 

operate the gas collection and gas control systems no later than 30 months 

after the approval of the design plan. 

(5) The owner or operator of an active MSW Landfill shall identify in their 

design plan the areas of the landfill that are closed or inactive. 

(6) Any area of the landfill that contains asbestos-containing waste or nondecomposable solid waste may be excluded from collection provided that 

the owner or operator submits documentation to the Executive Officer 

regarding the nature of the material, and the date of its deposit in the area. 

This documentation may be included as part of the design plan. 

(7) The design plan shall include a description of potential mitigation 

measures to be used to prevent the release of methane or other pollutants 

into the atmosphere during the installation or preparation of wells, piping, 

or other related components during repairs or the temporary shutdown of 

the gas collection system components; or to be used when solid waste is 

excavated and moved. 

(8) The gas collection device and gas control systems shall be operated, 

maintained and expanded in accordance with the procedures and schedules 

set forth in the approved design plan. 
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(9) If the District has not issued prior written approval for subsurface refuse 

boundary sampling probes, the owner or operator shall design and install 

subsurface refuse boundary sampling probes as specified in Section 1.1 

Attachment A, to determine whether landfill gas migration exists. 

Installation of the refuse boundary probes shall be no later than 18 months 

after the submittal of the gas collection and gas control systems design 

plan as specified in paragraph (d)(1). 

(10) Operate the gas collection system to prevent the concentration of TOC 

measured as methane from exceeding five percent by volume in the 

subsurface refuse boundary sampling probes constructed for the purposes 

of detecting lateral migration of landfill gas away from the waste mass, as 

determined from collected samples. 

(11) Operate the gas collection system to prevent the concentration of TOC 

measured as methane from exceeding 25 ppmv as determined by 

integrated samples taken on numbered 50,000 square foot landfill grids. 

(12) Operate the gas collection system to prevent the concentration of TOC 

measured as methane from exceeding 500 ppmv above background as 

determined by instantaneous monitoring at any location on the landfill, 

except at the outlet of any gas control device. 

(13) Operate the gas collection and gas control systems so that there are no 

leaks that exceed 500 ppmv TOC measured as methane at any component 

under positive pressure. Any component leak exceeding 500 ppmv must 

be tagged and repaired within 10 calendar days from the time of the first 

exceedance. 

(14) Operate the gas collection and gas control systems at all times for landfills 

with an Active Collection System. In the event the gas collection or gas 

control systems are inoperable, the active collection systems shall be shut 

down and all valves in the gas collection and gas control systems 

contributing to venting of the gas to the atmosphere shall be closed no 

later than one hour after such breakdown or no later than one hour after 

the time the owner or operator knew or reasonably should have known of 

its occurrence. 

(15) Operate the gas collection and gas control systems until all the exemption 

criteria under subdivision (k) have been met and the reports specified in 

subparagraph (f)(2)(D) have been submitted to the Executive Officer. 
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1150.1 - 10 

(16) Operate all Wellheads so the gauge pressure is under a constant vacuum 

(negative pressure), except under the following conditions: 

(A) During wellhead raising: When a new fill is being added or 

compacted in the immediate vicinity around the well and once 

installed, while a gas collection well extension is sealed or capped 

until the raised well is reconnected to vacuum source. 

(B) During repair and temporary shutdown of the gas collection system 

due to a catastrophic event, such as an earthquake, or to extinguish 

landfill fires; and as a result of these events, during repair efforts to 

connect new landfill gas collection system components to the 

existing gas collection system, and to do required permitted 

component connection for the gas collection system, and to 

perform permitted construction activities provided the following 

requirements are met: 

(i) Any new gas collection system components required to 

maintain compliance with this subparagraph must be 

included in the most recent Design Plan pursuant to

paragraph (d)(3). 

(ii) Methane and other landfill gas emissions are minimized 

during shutdown pursuant to subdivision (d). 

(17) Design, install, and operate a wind speed and direction monitoring system 

with a continuous recorder of the requirements in subparagraphs 

(d)(17)(A) and (d)(17)(B), at a site which is representative of the wind 

speed and direction in the areas being sampled. The wind velocity shall be 

recorded throughout the sampling period. The wind direction transmitter 

shall be oriented to true north using a compass. 

(A) For wind speed use a 3 cup assembly, with a range of 0 to 50 miles 

per hour, with a threshold of 0.75 mile per hour or less. 

(B) For wind direction, use a vane with a range of 0 to 540 degrees 

azimuth, with a threshold of plus-minus 2 degrees. 

(18) Comply with the requirements of Section 21140 – Final Cover, of 

California Code of Regulations Title 27, Subchapter 5 – Closure and PostClosure Maintenance, upon closure of a MSW landfill unit, incorporated 

herein as Attachment B. 

(19) Comply with the requirement of Section 20200 – State Water Resources 

Conservation Board (SWRCB) Applicability and Classification Criteria of 
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1150.1 - 11 

California Code of Regulations Title 27, Article 2 – SWRCB, Waste 

Classification and Management, with respect to the disposal of liquids and 

semi-solid waste at Class III landfills, incorporated herein as 

Attachment C. 

(20) Comply with the requirements of National Emissions Standards for 

Hazardous Air Pollutants (NESHAP) 40 CFR Part 63 Subpart AAAA, as 

applicable. 

(e) Active Landfill Sampling and Monitoring Requirements 

The MSW landfill owner or operator shall comply with the provisions of 

paragraphs (e)(1) through (e)(7), after installation of the landfill gas control 

system: 

(1) Monitor and collect samples for analysis as specified in Section 1.0, 

Attachment A, to determine the concentrations of TOC and TAC each 

month from the subsurface refuse boundary sampling probes, to assure 

continued compliance. Any measurement of 5 percent TOC by volume or 

greater shall be recorded as an exceedance and the actions specified in 

subparagraphs (e)(1)(A) through (e)(1)(C) shall be taken. 

(A) The probe shall be identified and the location recorded as specified 

in Section 1.6, Attachment A. 

(B) Adjustments to the vacuum of adjacent wells to increase the gas 

collection in the vicinity of the probe with the exceedance, shall be 

made and the probe resampled no later than 10 calendar days after 

detecting the exceedance. 

(C) If the resampling of the probe shows a second exceedance, 

additional corrective action shall be taken and the probe shall be 

resampled again no later than 10 calendar days after the second 

exceedance. If the resampling shows a third exceedance, it is a 

violation unless the owner or operator determines that a new or 

replacement gas collection well is needed. The owner or operator 

must install and operate the new or replacement well no later than 

45 days after detecting the third exceedance. 

(2) Collect monthly integrated samples for analysis as specified in Section 

2.0, Attachment A, to determine the concentrations of TOC and TAC from 

the landfill surface, and to assure continued compliance. Any reading of 
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1150.1 - 12 

25 ppmv or greater shall be recorded as an exceedance and the actions 

specified in subparagraphs (e)(2)(A) through (e)(2)(C) shall be taken. 

(A) The grid shall be identified and the location recorded as specified 

in Section 2.8, Attachment A. 

(B) If the sample shows an exceedance, the gas collection equipment 

and the landfill cover shall be serviced to ensure the exceedance is 

repaired. If adjustments to the vacuum of adjacent wells are made 

to increase the gas collection in the vicinity of the grid with the 

exceedance resample the grid no later than 10 calendar days after 

detecting the exceedance. If measurable precipitation occurs 

within the 10 calendar days, all resamples and analysis shall 

comply with Section 2.2.2, Attachment A. 

(C) If the resample of the grid shows a second exceedance, additional 

corrective action shall be taken and the grid shall be resampled 

again no later than 10 calendar days after the second exceedance. 

If the resample shows a third exceedance, it is a violation unless 

the owner or operator determines that a new or replacement gas 

collection well is needed. The owner or operator must install and 

operate the new or replacement well no later than 45 days after 

detecting the third exceedance. 

(3) Instantaneous surface monitoring as specified in Section 3.0, Attachment 

A, shall be conducted to determine the concentration of TOC each 

calendar quarter, to assure continued compliance. Any reading of 500 

ppmv TOC or greater other than non-repeatable momentary readings, shall 

be recorded as an exceedance and the actions specified in subparagraphs 

(e)(3)(A) through (e)(3)(C) shall be taken. Any closed or inactive MSW 

landfill that meets the definitions in (c)(4) or (c)(16) and has no observed 

monitoring readings that exceed 500 ppmv for the last four consecutive 

quarterly monitoring periods may, upon approval of the Executive Officer, 

monitor annually. Any reading of 500 ppmv TOC or more detected 

during the annual monitoring or an SCAQMD compliance inspection that 

cannot be remediated within 10 days shall result in a return to quarterly 

monitoring for the landfill. 

(A) The location of each exceedance shall be clearly marked and 

identified on a topographic map of the MSW landfill or identified 
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by using a global positioning system and the location recorded as 

specified in Section 3.4, Attachment A. 

(B) Corrective action must be taken by the owner or the operator, 

including, but not limited to one or more of the following: cover 

maintenance or repair, or well vacuum adjustments. The location 

shall be remonitored no later than 10 calendar days after detecting 

the exceedance. 

(C) If the remonitoring of the location shows a second exceedance, 

additional corrective action shall be taken and the location shall be 

remonitored again no later than 10 days after the second 

exceedance. If the remonitoring shows a third exceedance, it is a 

violation unless the owner or operator determines that a new or 

replacement gas collection well is needed. The owner or operator 

must install and operate the new or replacement well no later than 

45 days after detecting the third exceedance. 

(4) Wellheads shall each be monitored monthly to determine the gauge 

pressure. If there is any positive pressure reading, other than as provided 

in subparagraphs (d)(16)(A) and (d)(16)(B), the owner or operator shall 

take the following actions: 

(A) Initiate corrective action within 5 calendar days of the positive 

pressure measurement. 

(B) If the problem cannot be corrected within 15 days of the first 

positive pressure measurement, the owner or operator must initiate 

further action, including but not limited to, any necessary 

expansion of the gas collection system to mitigate any positive 

pressure readings. 

(C) All corrective actions, including any expansion of the gas 

collection and gas control systems, must be completed and any 

new wells must be in operation within 120 days of the date of the 

first positive pressure measurement. 

(D) Determination of gauge pressure must be determined using a handheld manometer, magnahelic gauge or other pressure measuring 

device approved by the Executive Officer. The device must be 

calibrated and operated in accordance with the manufacturer’s 

specifications. 
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1150.1 - 14 

(5) Collect a monthly landfill gas sample for analysis as specified in Section 

4.0, Attachment A, to determine the concentrations of TOC and TAC from 

the main gas collection header line entering any gas control systems. 

(6) Collect monthly ambient air samples for analysis as specified in Section 

5.0, Attachment A, to determine the concentrations of TOC and TAC from 

the landfill property boundary. 

(7) Monitor the gas collection and gas control systems equipment specified 

under subparagraphs (e)(7)(A), (e)(7)(B) and (e)(7)(C) in order to comply 

with subparagraph (d)(1)(C). 

(A) For enclosed combustors and enclosed flares, the following 

equipment must be installed, calibrated, maintained, and operated 

according to the manufacturer's specifications: 

(i) A temperature monitoring device equipped with a

continuous recorder and having an accuracy of plus-minus 

1 percent of the temperature being measured expressed in 

degrees Celsius or Fahrenheit. A temperature monitoring 

device is not required for boilers or process heaters with 

design heat input capacity greater than 44 megawatts. 

(ii) At least one gas flow rate measuring device that shall 

record the flow to the gas control device(s) at least every 15 

minutes. 

(B) For open flares and other non-combustion systems, demonstrate 

compliance with subparagraph (d)(1)(C) by providing information 

satisfactory to the Executive Officer describing the operation of the 

gas control device, the operating parameters that would indicate 

proper performance, and appropriate monitoring procedures. 

Alternatives to this rule shall be submitted as specified in 

subdivision (i). The Executive Officer may specify additional 

appropriate monitoring procedures. 

(C) All components containing landfill gas that are under positive 

pressure shall be monitored for leaks on a quarterly basis. Any 

component leak must first be tagged and then repaired within 10 

calendar days. Component leak testing at MSW landfills having 

landfill gas-to-energy facilities may conduct testing for leaks prior 

to scheduled maintenance or during planned outage periods. 
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1150.1 - 15 

(f) Active Landfill Recordkeeping and Reporting Requirements 

The MSW landfill owner or operator shall keep all records on paper, electronic or 

in other suitable data formats approved by the Executive Officer, kept up-to-date, 

readily accessible and maintained for at least a period of 5 years. Such records 

shall be made available to the Executive Officer upon request. Records older than 

2 years may be maintained off-site, if they are retrievable no later than 4 hours 

after request. 

(1) The records required in subparagraphs (f)(1)(A) through (f)(1)(L) shall be 

maintained and be accessible by the facility. 

(A) For the life of the gas control system, as measured during the 

initial source test or compliance determination: 

(i) The gas control device vendor specifications. 

(ii) The maximum expected gas generation flow rate as 

calculated pursuant to subparagraph (d)(1)(A). 

(iii) When demonstrating compliance with subparagraph 

(d)(1)(C) through the use of an enclosed combustion device 

other than a boiler or process heater with a design heat 

input capacity greater than 44 megawatts: 

(I) The average combustion temperature measured at 

least every 15 minutes and averaged over the same 

time period of the source test. 

(II) The reduction of NMOC and the reduction of 

methane determined as specified in clause 

(d)(1)(C)(i) achieved by the gas control device. 

(iv) When demonstrating compliance with subclause 

(d)(1)(C)(i) through the use of a boiler or process heater of 

any size: a description of the location at which the 

collected gas vent stream is introduced into the boiler or 

process heater and is established during the initial or most 

recent source test. 

(v) When demonstrating compliance with subparagraph

(d)(1)(A) though the use of a non-enclosed combustion 

device, the owner or operator shall maintain records of 

measurement from the initial source test and from each 

annual performance test as specified in 40 CFR 60.18. If 

the combustion device is an open flare, the owner or 
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1150.1 - 16 

operator shall maintain records of the flare flame 

monitoring and records of all periods of operation during 

which the pilot flame of the flare is absent. 

(B) The data required to be recorded under Section 1.6, Attachment A, 

for subsurface refuse boundary sampling probes and all remedial 

actions taken for exceedances of the 5 percent TOC standard 

required in paragraph (d)(10) and all actions taken and recorded to 

comply with Title 27 sec. 20937 (a)(2)(B)(i) through (a)(2)(B)(iv). 

(C) The data required to be recorded under Section 2.8, Attachment A, 

for integrated samples and all remedial actions taken for 

exceedances of the 25 ppmv TOC standard required in paragraph 

(d)(11). 

(D) The data required to be recorded under Section 3.4, Attachment A, 

for instantaneous monitoring and all remedial actions taken for 

exceedances of the 500 ppmv TOC standard required in paragraph 

(d)(12). Instantaneous monitoring exceedances from 200 to 499 

ppmv shall also be recorded but remedial action is not required. 

(E) The data required to be recorded under Section 4.5, Attachment A, 

for landfill gas samples collected from the main gas collection 

header line entering the gas treatment and/or gas control systems. 

(F) The data required to be recorded under Section 5.7, Attachment A, 

from ambient air collected at the landfill property boundary. 

(G) A description and the duration of all periods when the gas 

collection or gas control system was not operating for a period 

exceeding one hour and the length of time the system was not 

operating. 

(H) During construction that requires exposing solid waste material to 

the atmosphere, the following records are required:

(i) A description of actions taken, the affected area of the 

MSW Landfill, the reason the actions are required and a list 

of the landfill gas collection system components affected 

by actions; 

(ii) Construction start and finish dates, projected equipment 

installation dates, and projected shut down times for 

individual gas collection system components; and 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 17 

(iii) A description of the mitigation measures taken to minimize 

methane emissions and other potential air quality impacts 

during the construction period. 

(I) All records pertaining to solid waste acceptance, solid waste 

acceptance rate, and the current amount of waste in place. 

(J) All records pertaining to non-degradable waste acceptance, 

including the nature, location, amount, and the deposition for any 

landfill area excluded from the gas collection system. 

(K) All records of positive wellhead gauge pressure measurements, the 

date of the measurements, the well identification number, and the 

corrective action taken. 

(L) Continuous records of the equipment operating parameters 

specified to be monitored under paragraph (e)(7) as well as records 

for periods of operation during which the parameter boundaries 

established during the most recent source test are exceeded. 

(i) The following constitute exceedances that shall be 

recorded: 

(I) For enclosed combustors except for boilers and 

process heaters with design heat input capacity of 

44 megawatts (150 million British thermal unit per 

hour) or greater, all 3-hour periods of operation 

during which the average combustion temperature 

was more than 28o C (82o F) below the average 

combustion temperature during the most recent 

source test at which compliance with subparagraph 

(d)(1)(C) was determined. 

(II) For boilers or process heaters, whenever there is a 

change in the location at which the vent stream is 

introduced into the flame zone as required under 

clause (f)(1)(A)(iv). 

(ii) Records of the indication of flow to the gas control device 

specified in clause (e)(7)(A)(ii). 

(iii) Each owner or operator who uses a boiler or process heater 

with a design heat input capacity of 44 megawatts or 

greater to comply with subparagraph (d)(1)(C) shall keep 

records of all periods of operation of the boiler or process 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 18 

heater. (Examples of such records could include records of 

steam use, fuel use, or monitoring data collected pursuant 

to other State, local, Tribal, or Federal regulatory 

requirements.) 

(2) The reports required in subparagraphs (f)(2)(A) through (f)(2)(D) shall be 

submitted to the Executive Officer. 

(A) The initial source test report no later than 180 days after start-up 

and each succeeding complete annual source test report no later 

than 45 days after the anniversary date of the initial source test, for 

all gas control systems required in subparagraph (d)(1)(C). 

(B) A report no later than 45 days after the last day of each calendar 

quarter with the information required in clauses (f)(2)(B)(i) and 

(f)(2)(B)(ii). 

(i) All exceedances of the emission standards required in 

paragraphs (d)(10), (d)(11) and (d)(12) in the format 

required under Sections 1.6, 2.8 and 3.4, Attachment A. 

All exceedances resampled/remonitored and each 

corrective action required under paragraphs (e)(1), (e)(2) 

and (e)(3). If there are no exceedances, submit a letter 

stating there were no exceedances for that quarter.

(ii) All TAC analyses required in paragraphs (e)(1) through 

(e)(6). 

(C) Any owner or operator of a MSW landfill which has ceased 

accepting waste shall submit a closure report to the Executive 

Officer no later than 30 days after waste acceptance cessation. The 

report should include the last day solid waste was accepted, the 

projected date of closure for the MSW Landfill, and the estimated 

amount of waste-in-place. The Executive Officer may request 

additional information as may be necessary to verify that 

permanent closure has taken place in accordance with the 

requirements of 40 CFR, Part 258, Section 258.60 or the applicable 

federal, state and local statutes, regulations, and ordinances in 

effect at the time of closure. If a closure report has been submitted 

to the Executive Officer, no additional wastes shall be placed into 

the landfill without filing a notification of modification as 

described under 40 CFR, Part 60, Section 60.7(a)(4). 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 19 

(D) Any owner or operator of a MSW landfill which has ceased 

operation of a gas collection or gas control system shall submit a 

decommissioning report to the Executive Officer 30 days prior to 

well capping, removal or cessation of operation of the collection, 

treatment or control equipment. The decommissioning report shall 

contain all of the items as specified in clauses (f)(2)(D)(i) through 

(f)(2)(D)(iii): 

(i) A copy of the closure report submitted in accordance with 

subparagraph (f)(2)(C). 

(ii) A copy of the initial source test report demonstrating that 

the gas collection and gas control systems have been 

installed for a minimum of 15 years. 

(iii) All records needed to verify that the landfill meets the 

exemption criteria under subdivision (k). 

(3) An Annual Report shall be submitted by any owner or operator subject to 

the requirements of this rule. The Annual Report shall cover the period of 

January 1 through December 31 of each year. Each Annual Report shall 

be submitted by March 15 of the following year to the District. The 

Annual Report shall contain the following: 

(A) MSW Landfill name, owner and operator, address, solid waste 

information system (SWIS) identification number, landfill status 

(active, closed, inactive) and estimated waste-in–place in tons; 

(B) Total volume of landfill gas collected (reported in standard cubic 

feet); 

(C) Average composition of the landfill gas collected over the 

reporting period (reported in percent methane and percent carbon 

dioxide by volume); 

(D) Gas control device type, year of installation, rating, fuel type, and 

total amount of landfill gas combusted in each gas control device; 

(E) The date that the gas collection and gas control systems were 

installed and in full operation; 

(F) The percent methane destruction efficiency of each gas control 

device; 

(G) Type and amount of supplemental fuels burned with the landfill 

gas in each device; 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 20 

(H) Total volume of landfill gas shipped off-site, the composition of 

the landfill gas collected (reported in percent methane and percent 

carbon dioxide by volume), and the recipient of the gas; 

(I) Most recent topographic map of the site showing the areas with 

final cover and a geomembrane, and areas with final cover without 

a geomembrane, with corresponding percentages over the landfill 

surface; and 

(J) The records required by paragraph (f)(1) except for records 

required by subparagraphs (f)(1)(B), (f)(1)(E) and (f)(1)(F). 

(4) Any report or information required in paragraph (f)(2) or (f)(3) must be 

certified by a responsible official that the statements and information in 

the report are true, accurate, and complete. 

(g) Active Landfill Compliance Schedule 

The MSW landfill owner or operator shall comply with the active landfill 

requirements of this rule or an approved Rule 1150.1 Compliance Plan as 

specified in subdivision (i). An MSW landfill owner or operator that requires one 

or more alternatives to comply with this rule due to the April 1, 2011 rule 

amendment, shall submit a request for such alternatives as specified in 

subdivision (i) by May 6, 2011 that demonstrates compliance no later than July 1, 

2011, and shall comply with any previously approved Rule 1150.1 Compliance 

Plan until July 1, 2011 or until the owner or operator has received an approved 

revised Rule 1150.1 Compliance Plan. On and after July 1, 2011, the MSW 

landfill owner or operator shall operate pursuant to an approved Rule 1150.1 

Compliance Plan or, if plan approval is pending, the revised Rule 1150.1 

Compliance Plan submitted on or before May 6, 2011.

(h) Inactive Landfill Requirements 

The MSW landfill owner or operator shall comply with either the applicable 

requirements in paragraphs (h)(1) and (h)(2) or submit alternatives to this rule as 

specified in subdivision (i). 

(1) Inactive landfills that have a landfill gas collection system shall meet all of 

the active landfill requirements. For those inactive landfills without a gas 

collection system and determined to need one, meet all of the active 

landfill requirements, except the gas collection and gas control systems 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 21 

design plan. Applications for permits shall be submitted no later than one 

year after notification by the Executive Officer. 

(2) Inactive landfills without a gas collection system: 

(A) Upon discovery of TOC measured as methane exceeding 200 

ppmv at any location on the landfill surface, apply mitigation 

measures such as compaction, additional cover, and/or watering to 

reduce the emissions to less than 200 ppmv. The procedure used 

for measurement of TOC shall meet the requirements of Section 

3.0, Attachment A. 

(B) Submit the following data and/or meet the required action in 

paragraph (h)(1): 

(i) No later than 30 days after the receipt of a request, submit 

to the Executive Officer a screening questionnaire pursuant 

to California Air Resources Board Health and Safety Code 

(H & S) 41805.5. 

(ii) No later than 90 days after the date of a second request, 

submit to the Executive Officer a solid waste air quality 

assessment test (SWAT) report pursuant to H & S 41805.5, 

to determine whether or not a landfill gas collection and gas 

control systems and/or a subsurface refuse boundary probe 

sampling system shall be required to be installed. 

(iii) If additional time is needed to provide the information 

required in clauses (h)(2)(B)(i) and (h)(2)(B)(ii), a written 

request for an extension may be submitted in writing to the 

Executive Officer, indicating the amount of time that is 

needed to obtain such information. Such a request for an 

extension may be submitted to the Executive Officer no 

later than 30 days after the receipt of the Executive 

Officer's requests as specified in clauses (h)(2)(B)(i) and 

(h)(2)(B)(ii). 

(iv) Upon notification by the Executive Officer that a landfill 

gas collection and gas control systems and/or a subsurface 

refuse boundary probe sampling system shall be required, 

comply with paragraph (h)(1). 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 22 

(i) Alternatives 

The owner or operator of a MSW landfill may request alternatives to the 

compliance requirements, monitoring requirements, test methods, and test 

procedures of this rule. All requests for alternatives to the requirements of this 

rule shall be submitted to the Executive Officer in a Rule 1150.1 Compliance 

Plan. The Executive Officer shall review the Rule 1150.1 Compliance Plan and 

either approve it, disapprove it, or request that additional information be 

submitted. Unless a determination is made by the Executive Officer that the Rule 

1150.1 Compliance Plan will provide equivalent levels of emission control and 

enforceability, as would compliance with the requirements of this rule, the 

Executive Officer will deny the plan. Criteria that the Executive Officer may use 

to evaluate requests for alternatives include, but are not limited to: compliance 

history, documentation, containment of the landfill gas flow rate measured 

methane concentrations for individual gas collection wells or components, 

permits, component testing and surface monitoring results, gas collection and gas 

control systems operations, maintenance and inspection records, and historical 

meteorological data. Requests for alternatives may include, but are not limited to, 

the following: 

(1) Semi-continuous operation of the gas collection and gas control systems 

due to insufficient landfill gas flow rates. 

(2) Additional time for leak repairs for landfills having consistent issues 

related to the procurement and delivery of necessary parts to complete the 

repairs. 

(3) Alternative wind speed requirements for landfills consistently having wind 

speed in excess of the limit specified in Sec.2.2.1 of Attachment A. 

(j) Test Methods 

(1) Methods of Analysis 

(A) Either U.S. EPA Reference Method 25 or U.S. EPA Reference 

Method 18 (inlet only), 40 CFR, Part 60, Appendix A, SCAQMD 

Method 25.1 or SCAQMD Method 25.3 shall be used to determine 

the efficiency of the gas control system in reducing NMOC. If 

using Method 18, the minimum list of compounds to be tested shall 

be those published in the most recent Compilation of Air Pollutant 

Emission Factors (AP-42). The equation in subparagraph (j)(1)(B) 

shall be used to calculate efficiency. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 23 

(B) U.S. EPA Reference Method 25, 40 CFR, Part 60, Appendix A, 

SCAQMD Method 25.1, or SCAQMD Method 25.3 shall be used 

to determine the efficiency of the gas control system in reducing 

the outlet NMOC concentration to less than 20 ppmv, dry basis as 

hexane at 3 percent oxygen. The following equation shall be used 

to calculate efficiency: 

( )

( ) 100%

NMOC

NMOC NMOC Control Efficiency (%)

in

in out ×

−

=

where, 

NMOCin = mass of NMOC entering control device 

NMOCout = mass of NMOC exiting control device 

(C) Either U.S. EPA Reference Method 25, U.S. EPA Reference 

Method 18, 40 CFR, Part 60, Appendix A, SCAQMD Method 

25.1, SCAQMD Method 25.3, ASTM Method D1945, or ASTM 

Method D1946 shall be used to determine the efficiency of the gas 

control system in reducing methane. The equation in subparagraph 

(j)(1)(D) shall be used to calculate efficiency. 

(D) U.S. EPA Reference Method 25, U.S. EPA Reference Method 18, 

40 CFR, Part 60, Appendix A, SCAQMD Method 25.1, SCAQMD 

Method 25.3, ASTM Method D1945, or ASTM Method D1946 

shall be used to determine the efficiency of the gas control system 

in reducing the outlet methane concentration to less than 20 ppmv, 

dry basis as hexane at 3 percent oxygen. The following equation 

shall be used to calculate efficiency: 

( )

( ) 100%

Methane

Methane Methane Control Efficiency (%)

in

in out ×

−

=

where, 

Methanein = mass of Methane entering control device 

Methaneout = mass of Methane exiting control device 

(2) Equivalent Test Methods 

Any other method demonstrated to be equivalent and approved in writing 

by the Executive Officers of the District, the California Air Resources 

Board (CARB), and the Regional Administrator of the United States 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 24 

Environmental Protection Agency (U.S. EPA), Region IX, or their 

designees, may be used to determine compliance with this rule. 

(3) Approval for Conducting Test and Analysis 

The owner or operator shall use a test laboratory approved under the 

SCAQMD Laboratory Approval Program for source test methods cited in 

subdivision (j). If there is no approved laboratory, then approval of the 

testing procedures used by the laboratory shall be granted by the 

Executive Officer on a case-by-case basis based on SCAQMD protocols 

and procedures. In addition, when more than one source test method or 

set of source test methods are specified for any testing, the application of 

these source test methods to a specific set of test conditions is subject to 

approval by the Executive Officer. 

(4) Violation of Test Methods 

A violation established by any one of the specific source test methods or 

set of source test methods shall constitute a violation of this rule. 

(k) Exemptions 

An MSW landfill may be temporarily exempt from all or any portion of the 

requirements of this rule if the owner or operator can demonstrate to the Executive 

Officer that the MSW landfill emissions meet the requirements of paragraphs 

(k)(1) through (k)(5), temporary exemptions may be independently determined by 

the Executive Officer, if the MSW landfill emissions meet the requirements of 

paragraphs (k)(1) through (k)(5). MSW landfills issued temporary exemption 

letters by the Executive Officer shall remain exempt, subject to periodic review, 

provided: 

(1) The MSW landfill complies with the requirements of paragraphs (d)(10), 

(d)(11) and (d)(12). 

(2) The MSW landfill emits less than 55 tons per year of NMOC as specified 

in 40 CFR, Part 60, Section 60.752(b) or, for a closed landfill, as specified 

in 40 CFR, Part 60, Section 60.752(b)(2)(v)(C). 

(3) The MSW landfill constitutes a less than significant health risk. In 

making this determination the Executive Officer shall consider the listed 

factors in subparagraphs (k)(3)(A) through (k)(3)(G). Where not 

specified, in evaluating the cancer risks and hazard indices, the Executive 

Officer shall be guided by the definitions in District Rule 1401 - New 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 25 

Source Review of Carcinogenic Air Contaminants, and Rule 1402 - 

Control of Toxic Air Contaminants from Existing Sources. 

(A) The proximity to, and any adverse impacts on, residences, schools, 

hospitals or other locations or structures which have children, or 

elderly or sick persons. 

(B) The emission migration beyond the landfill property boundary. 

(C) The complaint history. 

(D) The age and closure date. 

(E) The amount and type of waste deposited. 

(F) That the emissions of carcinogenic air contaminants, specified in 

Tables 1 & 2, Attachment A, from the landfill will not result in a 

maximum individual cancer risk greater than one in one million 

(1 x 10-6) at any receptor location. 

(G) That the emissions of TAC, specified in Tables 1 & 2, Attachment 

A, from the landfill will not result in a total acute or chronic 

Hazard Index of greater than 1. 

(4) The MSW landfill is in compliance with District Nuisance Rule 402. 

(5) The MSW landfill does not generate sufficient gas to support a gas control 

system. In making this determination, the Executive Officer shall apply 

the requirements of subparagraphs (k)(5)(A) and (k)(5)(B), and shall only 

consider temporary exemptions from the requirements of subdivision (d). 

(A) If the MSW landfill is closed or inactive and has a landfill gas heat 

input capacity equal to or greater than 3.0 MMBtu/hr, the owner or 

operator must demonstrate to the satisfaction of the Executive 

Officer that after four consecutive quarterly instantaneous 

monitoring periods there are no surface methane leaks exceeding 

200 ppmv, and submit a waste-in-place report and all instantaneous 

surface monitoring records from the previous year to the Executive 

Officer. 

(B) If the MSW landfill is active and has 450,000 tons of waste-inplace or greater and a landfill gas heat input capacity greater than 

or equal to 3.0 MMBTU/hr, the owner or the operator must 

demonstrate to the satisfaction of the Executive Officer that after 

four consecutive quarterly instantaneous monitoring periods there 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 26 

are no surface methane leaks exceeding 200 ppmv and re-calculate 

the heat capacity annually. 

Such a temporary exemption shall be reviewed periodically by the Executive 

Officer, to consider the land use surrounding the landfill and gaseous emissions, 

and the impact on the public. Depending upon the results of the review, the 

Executive Officer may extend or terminate the exemption. 

(l) Loss of Exemption 

If an MSW landfill should have its temporary exemption terminated, the owner or 

operator shall comply with the active landfill requirements of this rule. 

(m) The amendments to this rule adopted April 1, 2011 implementing the State Air 

Resources Board Landfill Rule Cal. Code Regs. Tit. 17 §95460 et seq. shall not 

become effective until the State Air Resources Board Executive Officer or 

designee provides a letter to the District stating that the enforcement of these 

requirements shall be in lieu of the State Air Resources Board rule, which shall 

not be enforced within the District. 
Rule 1150.1 (Cont.) (Amended April 1, 2011)

1150.1 - 27 

ATTACHMENT A 

1.0 SUBSURFACE REFUSE BOUNDARY SAMPLING PROBES 

Paragraphs (d)(9) and (e)(1) Requirements of Rule 1150.1 

1.1 Subsurface Probe Design and Installation 

Landfills which are subject to Rule 1150.1 must install and maintain a subsurface 

refuse boundary probe sampling system of adequate design to determine if gas 

migration exists for the ultimate purpose of preventing surface emissions. 

CalRecycle also requires the installation of refuse boundary probes for purposes 

of detecting and ultimately preventing subsurface migration of landfill gas past 

the permitted property boundary of the landfill/disposal site as well as the 

prevention of the accumulation of landfill gas in on-site structures. It is the 

District’s intent that the subsurface refuse boundary probes required by paragraph 

(d)(9) of Rule 1150.1 be designed and installed in such a manner as to comply 

with the requirements of CalRecycle (whenever possible) and Sections 1.1.1 

through 1.1.4. 

1.1.1 The probes shall be installed within the landfill property line and outside 

the refuse disposal area. 

1.1.2 Wherever accessible, the probes shall be located no further than 100 feet 

from the refuse boundary. 

1.1.3 The spacing between probes shall be based on the adjacent land use no 

further than 1320 feet (1/4 mile) from the refuse boundary and shall be 

determined as follows: 

LAND USE SPACING 

Residential/Commercial 100 feet 

Public Access 500 feet 

Undeveloped Open Space, (No Public Access) 650 feet

Landfill with Liners 1000 feet 

1.1.4 Each probe shall be capped, sealed, have a sampling valve and be of 

multiple-depth design for which the depth shall be determined based on 

the depth of refuse no further than 500 feet from the probe as follows: 

First Depth 10 feet below surface. 

Second Depth 25% of refuse depth or 25 feet below surface, 

whichever is deeper. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 28 

Third Depth 50% of refuse depth or 50 feet below surface, 

whichever is deeper. 

Fourth Depth 75% of refuse depth or 75 feet below surface, 

whichever is deeper. 

Second, third, or fourth depth probes may be deleted if the required 

depth of such probe is deeper than the depth of the refuse. 

1.2 Number of Samples 

All refuse boundary gas probes at each depth shall be monitored monthly for TOC 

measured as methane using a portable flame ionization detector (FID) meeting the 

requirements of Section 3.2 and with a tube connected to the probe sampling 

valve. In addition, samples shall be taken as specified in Section 1.2.1 or 1.2.2 to 

determine the concentration of both TOC and TAC. The Executive Officer may 

require additional probes to be sampled upon written request. 

1.2.1 If the TOC concentration measured with the FID does not exceed 5% by 

volume in any of the probes, collect one bag sample from one probe with 

the highest concentration, or 

1.2.2 If the TOC concentration measured with the FID for any of the probes 

exceeds 5% by volume, collect one bag sample per probe from the 

probes with the highest concentrations above 5% by volume, from at 

least five probes. 

1.3 Subsurface Refuse Boundary Probe Sampling Procedure 

1.3.1 Prior to collecting gas samples, evacuate the probe (the probes must be 

sealed during evacuation) until the TOC concentration remains constant 

for at least 30 seconds. 

1.3.2 The constant TOC concentration shall be measured using an FID that 

meets the requirements in Section 3.2. 

1.3.3 Collect approximately a 10-liter gas sample in a Tedlar (DuPont trade 

name for polyvinyl) bag or equivalent container over a continuous tenminute period using the evacuated container sampling procedure 

described in Section 7.1.1 of EPA Method 18 or direct pump sampling 

procedure described in Section 7.1.2 of EPA Method 18. The container 

shall be LIGHT-SEALED. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 29 

1.4 Subsurface Refuse Boundary Probe Analytical Procedures 

All samples collected shall be analyzed no later than 72 hours after collection for 

TOC using U.S. EPA Method 25, 40 CFR, Part 60, Appendix A analysis or a 

portable FID that meets the requirements in Section 3.2 and for the TAC specified 

in Table 1 and upon written request, Table II, using U.S. EPA Compendium 

Method TO-14. 

1.5 Chain of Custody (Required for samples sent to the lab) 

A custody sheet shall accompany the bag samples. Each time a bag changes 

hands, it shall be logged on the custody sheet with the time of custody transfer 

recorded. Laboratory personnel shall record the condition of the sample (full, 

three-fourths full, one-half full, one-fourth full, or empty). An example of a 

custody sheet is shown in Figure 4. 

1.6 Recording the Results 

1.6.1 Record the volume concentration of TOC measured as methane for each 

individually identified refuse boundary probe (at each depth) and the 

volume concentration of TAC for selected probes on a quality control 

sheet as shown in Figure 3. Include a topographic map drawn to scale 

with the location of both the refuse boundary probes and the gas collection 

system clearly marked and identified. 

1.6.2 Maintain and submit the results as specified in subdivision (f) of 

Rule 1150.1. 

2.0 INTEGRATED LANDFILL SURFACE SAMPLING 

Paragraph (d)(11) and (e)(2) Requirements of Rule 1150.1 

2.1 Number of Samples 

The number of samples collected will depend on the area of the landfill surface. 

The entire landfill disposal area shall be divided into individually identified 

50,000 square foot grids. One monthly sample shall be collected from each grid 

for analysis. Any area that the Executive Officer deems inaccessible or dangerous 

for a technician to enter may be excluded from the sampling grids monitored by 

the landfill owner or operator. To exclude an area from monitoring, the landfill 

owner or operator shall file a written request with the Executive Officer. Such a 

request shall include an explanation of the requested exclusion and photographs 

of the area. The Executive Officer shall notify the landfill owner or operator in 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 30 

writing of the decision. Any exclusion granted shall apply only to the monitoring 

requirement. The 25 ppmv limit specified in paragraph (d)(11) of Rule 1150.1 

applies to all areas. 

2.2 Integrated Surface Sampling Conditions 

2.2.1. The average wind speed during this sampling procedure shall be five 

miles per hour or less. Surface sampling shall be terminated when the 

average wind speed exceeds five miles per hour or the instantaneous 

wind speed exceeds ten miles per hour. Average wind speed is 

determined on a 15-minute average. 

2.2.2. Surface sampling shall be conducted when the landfill is dry. The 

landfill is considered dry when there has been no measurable 

precipitation for the preceding 72 hours prior to sampling. Most major 

newspapers report the amount of precipitation that has fallen in a 24-

hour period throughout the Southern California area. Select the nearest 

reporting station that represents the landfill location or provide for 

measurable precipitation collection at the MSW landfill wind monitoring 

station. 

2.3 Integrated Surface Sampler Equipment Description 

An integrated surface sampler is a portable self-contained unit with its own 

internal power source. The integrated sampler consists of a stainless steel 

collection probe, a rotameter, a pump, and a 10-liter Tedlar bag enclosed in a 

LIGHT-SEALED CONTAINER to prevent photochemical reactions from 

occurring during sampling and transportation. The physical layout of the sampler 

is shown in Figure 1. 

An alternate integrated surface sampler may be used, provided that the landfill 

owner or operator can show an equivalency with the sampler specifications in 

Section 2.4 and shown in Figure 1. All alternatives shall be submitted as 

specified in subdivision (i) of Rule 1150.1. 

2.4 Integrated Surface Sampler Equipment Specifications 

2.4.1 Power: Batteries or any other power source. 

2.4.2 Pump: The diaphragm shall be made of non-lubricated Viton (Dupont 

trade name for co-polymer of hexafluoropropylene and vinylidene 

fluoride) rubber. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 31 

2.4.3 Bag: One 10-liter Tedlar bag with a valve. The Tedlar bag shall be 

contained in a LIGHT-SEALED CONTAINER. The valve shall be leak 

free and constructed of aluminum, stainless steel, or non-reactive plastic 

with a Viton or Buna-N (butadiene acrylonitrile co-polymer) o-ring seal. 

2.4.4 Rotameter: The rotameter shall be made of borosilicate glass or other 

non-reactive material and have a flow range of approximately 0-to-1 liter 

per minute. The scale shall be in milliliters or an equivalent unit. The 

graduations shall be spaced to facilitate accurate flow readings. 

2.4.5 Air Flow Control Orifice: Needle valve in the rotameter. 

2.4.6 Funnel: 316 stainless steel. 

2.4.7 Fittings, Tubing and Connectors: 316 stainless steel or Teflon. 

2.5 Integrated Surface Sampling Procedure 

2.5.1 An integrated surface sampler as described in Section 2.4 shall be used 

to collect a surface sample approximately 8-to-10 liters from each grid. 

2.5.2 During sampling, the probe shall be placed 0-to-3 inches above the 

landfill surface. 

2.5.3 The sampler shall be set at a flow rate of approximately 333 cubic 

centimeters per minute 

2.5.4 Walk through a course of approximately 2,600 linear feet over a 

continuous 25-minute period. Figure 2 shows a walk pattern for the 

50,000 square foot grid. 

2.6 Integrated Surface Sample Analytical Procedures

All samples collected shall be analyzed no later than 72 hours after collection for 

TOC using U.S. EPA Method 25, 40 CFR, Part 60, Appendix A analysis or a 

portable FID that meets the requirements in Section 3.2. In addition, the samples 

specified in Section 2.6.1 or 2.6.2 must be analyzed no later than 72 hours after 

collection for the TAC specified in Table 1 and upon written request, Table II, 

using U.S. EPA Compendium Method TO-14. 

2.6.1 Ten percent of all samples which have a concentration of TOC greater 

than 25 ppmv as methane, or 

2.6.2 Two samples if all samples are 25 ppmv or less of TOC or two samples if 

there are less than 20 samples above 25 ppmv. 

The Executive Officer may require more samples to be tested for TAC if he 

determines there is a potential nuisance or public health problem. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 32 

2.7 Chain of Custody (Required for samples sent to the lab) 

A custody sheet shall accompany the bag samples. Each time a bag changes 

hands, it shall be logged on the custody sheet with the time of custody transfer 

recorded. Laboratory personnel shall record the condition of the sample (full, 

three-fourths full, one-half full, one-fourth full, or empty). An example of a 

custody sheet is shown in Figure 4. 

2.8 Recording the Results 

2.8.1 Record the volume concentration of both TOC measured as methane for 

each grid and the volume concentration for the required TAC on a 

quality control sheet as shown in Figure 3. Include a topographic map 

drawn to scale with the location of the grids and the gas collection 

system clearly marked and identified. 

2.8.2 Record the wind speed during the sampling period using the wind speed 

and direction monitoring system required in paragraph (d)(17) of 

Rule 1150.1. 

2.8.3 Maintain and submit the results as specified in subdivision (f) of 

Rule 1150.1. 

3.0 INSTANTANEOUS LANDFILL SURFACE MONITORING 

Paragraphs (d)(12) and (e)(3) Requirements of Rule 1150.1 

3.1 Monitoring Area 

The entire landfill disposal area shall be monitored once each calendar quarter. 

Any area of the landfill that the Executive Officer deems as inaccessible or 

dangerous for a technician to enter may be excluded from the area to be 

monitored by the landfill owner or operator. To exclude an area from monitoring, 

the landfill owner or operator shall file a petition with the Executive Officer. 

Such a request shall include an explanation of why the area should be excluded 

and photographs of the area. Any excluded area granted shall only apply to the 

monitoring requirement. The 500 ppmv limit specified in paragraph (d)(12) of 

Rule 1150.1 applies to all areas. 

3.2 Equipment Description and Specifications 

A portable FID shall be used to instantaneously measure the concentration of 

TOC measured as methane at any location on the landfill. The FID shall meet the 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 33 

specifications listed in Sections 3.2.1 through 3.2.4 and shall be kept in good 

operating condition. 

3.2.1 The portable analyzer shall meet the instrument specifications provided 

in Section 3 of U.S. EPA Method 21, except that: 

3.2.1.1 “Methane” shall replace all references to VOC. 

3.2.1.2 A response time of 15 seconds or shorter shall be used instead 

of 30 seconds. 

3.2.1.3 A precision of 3% or better shall be used instead of 10%. 

In addition the instrument shall meet the specifications in 

Sections 3.2.1.4 through 3.2.1.6. 

3.2.1.4 A minimum detectable limit of 5 ppmv (or lower). 

3.2.1.5 A flame-out indicator, audible and visual. 

3.2.1.6 Operate at an ambient temperature of 0 - 50o C. 

3.2.2 The calibration gas shall be methane, diluted to a nominal 

concentration of 10,000 ppmv in air for subsurface refuse boundary 

probe monitoring and sample analysis to comply with paragraph (e)(1) 

of Rule 1150.1, 25 ppmv in air for integrated sample analyses to 

comply with paragraph (e)(2) of Rule 1150.1 and 500 ppmv in air for 

instantaneous monitoring to comply with paragraph (e)(3) of Rule 

1150.1. 

3.2.3 To meet the performance evaluation requirements in Section 3.1.3 of 

U.S. EPA Method 21, the instrument evaluation procedures of Section 

4.4 of U.S. EPA Method 21 shall be used. 

3.2.4 The calibration procedures provided in Section 4.2 of U.S. EPA 

Method 21 shall be followed at the beginning of each day before 

commencing a surface monitoring survey. 

3.3 Monitoring Procedures 

3.3.1 The owner or operator shall monitor the landfill disposal area for TOC 

measured as methane using the described portable equipment. 

3.3.2 The sampling probe shall be placed at a distance of 0-3 inches above any 

location of the landfill to take the readings. 

3.3.3 At a minimum, an individually identified 50,000 square foot grid shall be 

used and a walk pattern similar to that illustrated in Figure 2 shall be 

implemented including areas where visual observations indicate elevated 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 34 

concentrations of landfill gas, such as distressed vegetation and cracks or 

seeps in the cover. 

3.4 Recording the Results 

3.4.1 Record the location and concentration of TOC measured as methane for 

any instantaneous reading of 200 ppmv or greater on a topographic map 

of the landfill, drawn to scale with the location of both the grids and the 

gas collection system clearly marked and identified. 

3.4.2 Maintain and submit the results as specified in subdivision (f) of 

Rule 1150.1. 

4.0 LANDFILL GAS SAMPLE FROM GAS COLLECTION SYSTEM 

Paragraph (e)(5) Requirement of Rule 1150.1 

4.1 Number of Samples 

Collect one monthly sample of landfill gas for analysis from the main gas 

collection header line entering the gas treatment and/or gas control system(s). 

4.2 Sampling Procedure 

Collect approximately a 10-liter sample in a Tedlar bag or equivalent container 

over a continuous ten-minute period. 

4.3 Analytical Procedures 

Samples collected shall be analyzed no later than 72 hours after collection for 

TOC using U.S. EPA Method 25, 40 CFR, Part 60, Appendix A analysis and for 

the TAC specified in Table 1 and upon written request, Table II, using U.S. EPA 

Compendium Method TO-14. 

4.4 Chain of Custody (Required for samples sent to the lab) 

A custody sheet shall accompany the bag samples. Each time a bag changes 

hands, it shall be logged on the custody sheet with the time of custody transfer 

recorded. Laboratory personnel shall record the condition of the sample (full, 

three-fourths full, one-half full, one-fourth full, or empty). An example of a 

custody sheet is shown in Figure 4. 

4.5 Recording the Results 

4.5.1 Record the volume concentration of both TOC measured as methane and 

the volume concentration for the required TAC on a quality control sheet 

as shown in Figure 3. Include a topographic map drawn to scale with the 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 35 

location of the gas collection and gas control systems clearly marked and 

identified. 

4.5.2 Maintain and submit the results as specified in subdivision (f) of 

Rule 1150.1. 

5.0 AMBIENT AIR SAMPLES AT THE LANDFILL PROPERTY 

BOUNDARY 

Paragraph (e)(6) Requirement of Rule 1150.1 

5.1 Number of Samples 

Monthly ambient air samples shall be collected for analysis at the landfill property 

boundary from both an upwind and downwind sampler sited to provide good 

meteorological exposure to the predominant offshore (drainage land breeze) and 

onshore (sea breeze) wind flow patterns. The upwind and downwind samples 

shall be collected simultaneously over two 12 hour periods beginning between 

9:00 a.m. and 10:00 a.m., and 9:00 p.m. and 10:00 p.m. on the same day or 

different days. 

5.2 Ambient Air Sampling Conditions 

Ambient air sampling shall be conducted on days when stable (offshore drainage) 

and unstable (onshore sea breeze) meteorological conditions are representative for 

the season. Preferable sampling conditions are characterized by the following 

meteorological conditions: 

5.2.1 Clear cool nights with wind speeds of two miles per hour or less, and 

5.2.2 Onshore sea breezes with wind speeds ten miles per hour or less. 

No sampling will be conducted if the following adverse meteorological conditions 

exist: 

5.2.3 Rain, 

5.2.4 Average wind speeds greater than 15 miles per hour for any 30-minute

period, or 

5.2.5 Instantaneous wind speeds greater than 25 miles per hour. 

Continuously recorded on-site wind speed and direction measurements required in 

paragraph (d)(17) of Rule 1150.1 will characterize the micrometeorology of the 

site and serve to verify that the meteorological criteria have been met during 

sampling. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 36 

5.3 Ambient Air Sampler Equipment Description 

An ambient air sampling unit consists of a 10-liter Tedlar bag, a DC-operated 

pump, stainless steel capillary tubing to control the sample rate to the bag, a 

bypass valve to control the sample flow rate (and minimize back pressure on the 

pump), a Rotameter for flow indication to aid in setting the flow, a 24-hour clock 

timer to shut off the sampler at the end of the 24-hour sampling period, and 

associated tubing and connections (made of stainless steel, Teflon, or borosilicate 

glass to minimize contamination and reactivity). The physical layout of the 

sampler is shown in Figure 5. 

An alternate ambient air sampler may be used, provided that the landfill owner or 

operator can show an equivalency with the sampler specifications in Section 5.3 

and shown in Figure 5. All alternatives shall be submitted as specified in 

subdivision (i) of Rule 1150.1. 

5.4 Ambient Air Sampler Equipment Specifications 

The equipment used when conducting air samples at any landfill property 

boundary shall meet the following specifications: 

5.4.1 Power: one 12V DC marine battery. The marine battery provides 12V 

DC to the pump and the clock. 

5.4.2 Pump: one 12V DC pump. The diaphragm shall be made of nonlubricated Viton rubber. The maximum pump unloaded flow rate shall 

be 4.5 liters per minute. 

5.4.3 Bag: One 10-liter Tedlar bag with a valve. The Tedlar bag shall be 

enclosed in a LIGHT-SEALED CONTAINER. The valve is a push-pull 

type constructed of aluminum and stainless steel, with a Viton or Buna-N 

(butadiene acrylonitrile co-polymer) o-ring seal. 

5.4.4 Rotameter: made of borosilicate glass and has a flow range of 3-to-50 

cubic centimeters per minute. The scale is in millimeters (mm) with 

major graduations (labeled) every 5 mm and minor graduations every 1 

mm. 

5.4.5 Air flow control orifice: 316 stainless steel capillary tubing. 

5.4.6 Bypass valve. 

5.4.7 Fittings, tubing, and connectors: 315 stainless steel or Teflon. 

5.4.8 Clock timer with an accuracy of better than 1%. 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 37 

5.5 Ambient Air Sample Analytical Procedures 

Samples collected must be analyzed no later than 72 hours after collection for 

TOC using U.S. EPA Method 25, 40 CFR, Part 60, Appendix A analysis or a 

portable FID that meets the requirements in Section 3.2 and for the TAC specified 

in Table 1 and upon written request, Table II, using U.S. EPA Compendium 

Method TO-14. 

5.6 Chain of Custody (Required for samples sent to the lab) 

A custody sheet shall accompany the bag samples. Each time a bag changes 

hands, it shall be logged on the custody sheet with the time of custody transfer 

recorded. Laboratory personnel shall record the condition of the sample (full, 

three-fourths full, one-half full, one-fourth full, or empty). An example of a 

custody sheet is shown in Figure 4. 

5.7 Recording the Results 

5.7.1 Record the volume concentration of TOC measured as methane and the 

volume concentration of TAC for each sample on a quality control sheet 

as shown in Figure 3. Include a topographic map drawn to scale with the 

location of both the upwind and downwind samplers and the gas collection 

and gas control systems clearly marked and identified. 

5.7.2 Record the wind speed and direction during the 24-hour sampling period 

using the wind speed and direction monitoring system required in 

paragraph (d)(17) of Rule 1150.1. 

5.7.3 Maintain and submit the results as specified in subdivision (f) of 

Rule 1150.1.
Rule 1150.1 (Cont.) (Am

(Attachment A Continued)

1150.1 - 38 

Inlet Probe 

Rotameter

Batteries 

+ 

Pump 

Cardboard Box 

In 

Out 

PORTABLE INTEGRATED BAG SAMPLER Physical Layout 

Figure 1 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

(Attachment A Continued)

1150.1 - 39 

Typical Landfill Walk Pattern 

for a 50,000 Square Foot Grid

Figure 2

500 Feet

100 Feet

25 Feet 
Rule 1150.1 (Cont.) 

(Attachment A Continued)

1150.1 - 40 

TYPICAL QUALITY CONTROL SHEET 

• Prior to use, the Tedlar bag system shall be leak checked, evacuated and filled with purified nitrogen thre

• All samples must be kept in LIGHT-SEALED CONTAINERS to avoid photochemical reactions. 

OPERATION BAG SAMPLES 

Grid or 

probe # 

Date Wind 

Speed 

Time 

On 

Time 

Off 

I.D.# Valve 

Open 

Rotameter

Reading 

Pump 

(On/Off) 

Signature: Figure 3
Rule 1150.1 (Cont.) (Am

(Attachment A Continued)

1150.1 - 41 

BAG SAMPLE CUSTODY FORM 

Project Date:

Bag (I.D. #) 

Condition Received in Lab* 

Bags Prepared By: Tim Date

Bags Taken Out By: TimBags Taken to Lab By Bags Received In Lab By: Tim

* F = 1/2 full to full, 0 = Overfull (Bulging), L = 1/4 to 1/2 full,  E = Less than 1/4 full but contains some sample, N = No sample at all. 

Figure 4
Rule 1150.1 (Cont.) 

(Attachment A Continued)

1150.1 - 42 

24 VoltBattery 

- + 

Pump 

+ 

- 

Inlet 

Bypass 

Valve 

Rotometer 

Critical Orifice 

Figure 5
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 43 

TABLE 1 - CARCINOGENIC AND TOXIC AIR CONTAMINANTS

(Core Group) 

Paragraph (e)(2), Subparagraphs (k)(3)(F) and (k)(3)(G) Requirements of 

Rule 1150.1 

1. Benzene C6H6

2. Benzyl Chloride C6H5H2C1 

3. Chlorobenzene C6H5C1 

4. 1,2 Dibromoethane (Ethylene Dibromide) BrCH2CH2Br 

5. Dichlorobenzene C6H4C12

6. 1,1 Dichloroethane (Ethylidene Chloride) CH3CHC12

7. 1,2 Dichloroethane (Ethylene Dichloride) C1H2H2C1 

8. 1,1 Dichloroethene (Vinylidene Chloride) CH2 : CC12

9. Dichloromethane (Methylene Chloride) CH2C12

10. Hydrogen Sulfide H2S 

11. Tetrachloroethylene (Perchloroethylene) C12C : CC12

12. Tetrachloromethane (Carbon Tetrachloride) CC14

13. Toluene C6H5CH3

14. 1,1,1 Trichloroethane (Methyl Chloroform) CH3CC13

15. Trichloroethylene CHC1 : CC12

16. Trichloromethane (Chloroform) CHC13

17. Vinyl Chloride CH2 : CHC1 

18. Xylene C6H4(CH3)2 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 44 

TABLE 2 - CARCINOGENIC AND TOXIC AIR CONTAMINANTS

(Supplemental Group) 

Paragraph (e)(2), Subparagraphs (k)(3)(F) and (k)(3)(G) Requirements of 

Rule 1150.1 

1. Acetaldehyde CH3CHO 

2. Acrolein CH2CHCHO 

3. Acrylonitrile H2C : CHCN 

4. Allyl Chloride H2C : CHCH2C1 

5. Bromomethane (Methyl Bromide) CH3Br 

6. Chlorinated Phenols 

7. Chloroprene H2C : CHCC1 : CH2 

8. Cresol CH3C6H4OH 

9. Dialkyl Nitrosamines 

10. 1,4 - Dioxane OCH2CH2OCH2CH2 

11. Epichlorohydrin CH2OCHCH2C1 

12. Ethylene Oxide CH2CH2O 

13. Formaldehyde HCHO 

14. Hexachlorocyclopentadiene C5C16 

15. Nitrobenzene C6H5NO2 

16. Phenol C6H5OH 

17. Phosgene COC12 

18. Polychlorinated Dibenzo-P-Dioxin 

19. Polychlorinated Dibenzo Furan 

20. Polychlorinated Biphenols 

21. Polynuclear Aromatic Hydrocarbons 

22. Propylene Oxide CH2-CH-CH3 

23. Tetrahydrothiophene CH2CH2CH2CH2S 

24. Thiophene CHCHCHCHS 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 45 

Attachment B 

TITLE 27. Environmental Protection 

 Division 2. Solid Waste 

Subdivision 1. Consolidated Regulations for Treatment, Storage, Processing or Disposal of Solid 

Chapter 3. Criteria for All Waste Management Units, Facilities, and Disposal Sites 

Subchapter S. Closure and Post-Closure Maintenance

Article 2. Closure and Post-Closure Maintenance Standards for Disposal Sites and 

Landfills 

 §21140. Section CIWMB -- Final Cover. (Tl4:§17773) 

(a) The final cover shall function with minimum maintenance and provide waste 

containment to protect public health and safety by controlling at a minimum, vectors, fire, 

odor, litter and landfill gas migration. The final cover shall also be compatible with 

postclosure land use. 

(b) In proposing a final cover design meeting the requirements under §21090, the 

owner or operator shall assure that the proposal meets the requirements of this section. 

Alternative final cover designs shall meet the performance requirements of ¶(a) and for 

MSWLF units, 40 CFR 258.60(b); shall be approved by the enforcement agency for 

aspects of ¶(a). 

(c) The EA may require additional thickness, quality, and type of final cover 

depending on, but not limited to the following: 

(1) a need to control landfill gas emissions and fires; 

(2) the future reuse of the site; and 

(3) provide access to all areas of the site as needed for inspection of monitoring and 

control facilities, etc. 

NOTE 

Authority cited: Sections 40502 and 43020, Public Resources Code; and 

Section 66796.22 (d), Government Code. Reference: Sections 43021 and 43103, Public 

Resources Code; and Section 66796.22(d), Government Code. 

HISTORY 

1. New section filed 6-18-97; operative 7-18-97 (Register 97, No. 25). 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 46 

Attachment C 

TITLE 27. Environmental Protection 

Division 2. Solid Waste 

 Subdivision 1. Consolidated Regulations for Treatment, Storage, Processing or 

Disposal of Solid 

 Chapter 3. Criteria for All Waste Management Units, Facilities, and Disposal Sites 

 Subchapter 2. Siting and Design 

 Article 2. SWRCB -- Waste Classification and Management 

 §20200. SWRCB -- Applicability and Classification Criteria. (CI5: §2520) 

(a) Concept--This article contains a waste classification system which applies to solid 

wastes that cannot be discharged directly or indirectly to waters of the state and which 

therefore must be discharged to waste management units (Units) for treatment, storage, or 

disposal in accordance with the requirements of this division. Wastes which can be 

discharged directly or indirectly (e.g., by percolation ) to waters of the state under 

effluent or concentration limits that implement applicable water quality control plans 

(e.g., municipal or industrial effluent or process wastewater ) are not subject to the 

SWRCB-promulgated provisions of this division. This waste classification system shall 

provide the basis for determining which wastes may be discharged at each class of Unit. 

Waste classifications are based on an assessment of the potential risk of water quality 

degradation associated with each category of waste.

(1) The waste classifications in this article shall determine where the waste can be 

discharged unless the waste does not consist of or contain municipal solid waste (MSW) 

and the discharger establishes to the satisfaction of the RWQCB that a particular waste 

constituent or combination of constituents presents a lower risk of water quality 

degradation than indicated by classification according to this article. 

(2) Discharges of wastes identified in §20210 or §20220 of this article shall be 

permitted only at Units which have been approved and classified by the RWQCB in 

accordance with the criteria established in Article 3 of this subchapter, and for which 

WDRs have been prescribed or waived pursuant to Article 4, Subchapter 3, Chapter 4 of 

this subdivision (§21710 et seq.). Table 2.1 (of this article) presents a summary of 

discharge options for each waste category. 

(b) Dedicated Units/Cells For Certain Wastes--The following wastes shall be 

discharged only at dedicated Units [or dedicated landfill cells (e.g., ash monofill cell)] 

which are designed and constructed to contain such wastes: 

(1) wastes which cause corrosion or decay, or otherwise reduce or impair the integrity 

of containment structures; 

(2) wastes which, if mixed or commingled with other wastes can produce a violent 

reaction (including heat, pressure, fire or explosion), can produce toxic byproducts, or 

can produce any reaction product(s) which: 

(A) requires a higher level of containment; 

(B) is a restricted waste; or 

(C) impairs the integrity of containment structures. 

(c) Waste Characterization--Dischargers shall be responsible for accurate 

characterization of wastes, including determinations of whether or not wastes will be 
Rule 1150.1 (Cont.) (Amended April 1, 2011) 

1150.1 - 47 

compatible with containment features and other wastes at a Unit under ¶(b), and whether 

or not wastes are required to be managed as hazardous wastes under Chapter 11 of 

Division 4.5 of Title 22 of this code. 

(d) Management of Liquids at Landfills and Waste Piles--The following requirements 

apply to discharges of liquids at Class II waste piles and at Class II and Class III landfills, 

except as otherwise required for MSW landfills by more-stringent state and federal 

requirements under SWRCB Resolution No. 93-62 section 2908 of Title 23 of this Code 

(see 40CFR258.28) [Note: see also definitions of "leachate” and "landfill gas 

condensate” in §20164]:

(1) [Reserved.]; 

(2) wastes containing free liquids shall not be discharged to a Class II waste pile. 

Any waste that contains liquid in excess of the moisture-holding capacity of the waste in 

the Class II landfill, or which contains liquid in excess of the moisture-holding capacity 

as a result of waste management operations, compaction, or settlement shall only be 

discharged to a surface impoundment or to another Unit with containment features 

equivalent to a surface impoundment; and 

(3) liquids or semi-solid waste (i.e., waste containing less than 50 percent solids, by 

weight), other than dewatered sewage or water treatment sludge as described in 

§20220(c), shall not be discharged to Class III landfills. Exceptions may be granted by 

the RWQCB if the discharger can demonstrate that such discharge will not exceed the 

moisture-holding capacity of the landfill, either initially or as a result of waste 

management operations, compaction, or settlement, so long as such discharge is not 

otherwise prohibited by applicable state or federal requirements.