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<br />BARCLAYS CALIFORNIA CODE OF REGULATIONS
<br />facility are controlled during the periods of closure and postclosure main-
<br />tenance, in accordance with the following requirements:
<br />(1) The concentration of methane gas must not exceed 1.25% by vol-
<br />ume in air within on-site strucuwm
<br />(2) The concentration of methane gas migrating from the landfill must
<br />not exceed 5% by volume in air at the facility property boundary or an
<br />alternative boundary in accordance with section 17783.5.
<br />(3) Trace gases shall be controlled to prevent adverse acute and chron-
<br />ic exposure to toxic and/or carcinogenic compounds.
<br />(b) The program implemented pursuant to sections 17783 through
<br />17783.17 of this article shall continue for a period of thirty (30) years or
<br />until the operator receives written authorization to discontinue by the lo-
<br />cal enforcement agency and the Board. Authorization to cease gas moni-
<br />toring and control shall be based on a demonstration by the operator that
<br />there is no potential for gas migration beyond the property boundary or
<br />into on-site structures. Demonstration of this proposal shall be supported
<br />by data collected and any additional studies.
<br />(c) The gas monitoring program required pursuant to sections 17783
<br />through 17783.17 of this article, shall be described a part of preliminary
<br />and final postclosure maintenance plans.
<br />(d) Gas monitoring and control systems shall be modified, during the
<br />closure and postclosurc maintenance period, to reflect changing on-site
<br />and adjacent land uses. Postclosure land use at the site shall not interfere
<br />with the function of gas monitoring and control systems. The operator
<br />may request a reduction of monitoring or control activities based upon
<br />the results of monitoring data collected. The request for reduction of
<br />monitoring or control activities shall be submitted in writing to the local
<br />enforcement agency and the Board.
<br />NOTE Authority cited: Sections 40502 and 45020, Public Resources Code. and
<br />Section 66796.22(d), Government Code. Reference: Section 43021, Public Re-
<br />sources Code: and Section 66796.22(d), Government Code.
<br />HlstoRY
<br />1. Change without regulatory effect adding section 17783 filed 8-17-89 pursuant
<br />to section 100, Title 1, California Code of Regulations (Register 99,14o. 35).
<br />2. New subsections (aHd) flkd 8-18-89 as an emergency; operative 8-18-89
<br />(Register 89, No. 35). A Certificate of Compliance must be transmuted to OAL
<br />within 120 days or emergency language will be repealed by operation of law
<br />on 12-18-89.
<br />3. New subsections (a) -(d) refiled 12-8-89 as an emergency; operative 12-18-89
<br />(Register 89. No. 51). A Certificate of Compliance must be transmitted to O AL
<br />within 120 days or emergency language will be repealed by operation of law,
<br />on 4-17-90.
<br />4. New subsections (aHd) refiled 3-22-90 as an emergency; operative 3-22-90
<br />(Register 90, No. 17). A Certificate of Compliance must be transmitted to OAL
<br />within 120 days (by 7-20-90) or emergency language will be repealed by oper-
<br />ation of law on 7-21-90.
<br />S. Certificate of Compliance as to 3-22-90 order uansmiaed to OAL 5-17-90
<br />and filed 6-19-90 (Register 90, No. 34).
<br />§ 17783.3. Monitoring.
<br />(a) To ensure that the conditions of section 17783 are met, the operator
<br />shall implement a gas monitoring program at the facility in accordance
<br />with the following requirements
<br />(1) The gas monitoring network shall be designed by a registered civil
<br />engineer or a certified engineering geologist, and shall ensure detection
<br />of the presence of landfill gas migrating beyond the landfill property
<br />boundary and also into on-site structures.
<br />(2) The monitoring network shall be designated to account for the fol-
<br />lowing specific site characteristics, and potential migration pathways or
<br />barriers, including, but not limited to:
<br />(A) local soil and rock conditions;
<br />(B) hydrogeological conditions at the facility;
<br />(C) locations of buildings and structures relative to the waste deposit
<br />area;
<br />(D) adjacent land use, and inhabitable structures within 1000 feet of
<br />the landfill property boundary;
<br />(E) man-made pathways, such as underground construction; and
<br />(F) the nature and age of waste and its potential to generate landfill gas.
<br />Title
<br />or>=• Authority cited: Sections 40502 and 45020, Public Resources Code-, and
<br />tection 66796.22(d), Government Code. Reference: Section 43021, Public Re-
<br />sources Code- and Section 66796.22(d), Government Code.
<br />Hisroay
<br />1. New section filed 8-18-89 as an emergency. operative 8-18-89 (Register 89,
<br />No. 35). A Certificate of Compliance must be u=mitted to OAL within 120
<br />days or emergency language will be repealed by operation of law on 12-18-89.
<br />2. New section refiled 12-8-89 as an emergencq; operative 12-18-89 (Register
<br />89, No. 51). A Certificate of Compliance must be transmitted to OAL within
<br />120 days or emergency language will be repealed by operation of law on
<br />4-17-90.
<br />3. Certificate of Compliance transmitted to OAL 2-9-90 and withdrawn
<br />3-12-90. New section refiled 4-26-90 as an emergency; operative 4-26-90
<br />(Register 90, No. 17). A Certificate of Compliance must be transmitted to OAL
<br />within 120 days (by a-24-90) or emergency language will be repealed by oper-
<br />ation of law on 8-25-90.
<br />4. Certificate of Compliance as too -26-90 order including deletion ofsubsection
<br />(ax3) transmitted to OAL 5-17-90 and filed 6-18-90 (Register 90, No.34).
<br />§ 17783.5. Perimeter Monitoring Network.
<br />(a) Location
<br />(1) Perimeter subsurface monitoring wells shall be installed around the
<br />waste deposit perimeter but lot within refuse. The entire perimeter of the
<br />landfill may not warrant the installation of monitoring wells. In this case.
<br />the operator shall demonstrate to the satisfaction of the local enforcement
<br />agency with the concurrence of the Board, that gas migration could not
<br />occur due to geologic or hydraulic barriers, and that no inhabitable struc-
<br />ture or other property such as agricultural lands within 1,000 feet of the
<br />property boundary arethrrteatened by gas migration.
<br />(2) Perimeter monitoring wells shall be located at or near the facility
<br />property boundary. The operator may establish an alternate boundary
<br />closer to the waste deposit area based on a knowledge of the site factors
<br />in subsection 17783.3 (a) (2). When compliance levels are exceeded at
<br />the alternate boundary,the_ operator shall install additional monitoring
<br />wells closer to the property boundary, and/or implement gas control pro-
<br />cedures pursuant to section 17783.15.
<br />(b) Spacing
<br />(1) The lateral spacin g between adjacent monitoring wells shall not ex-
<br />ceed 1,000 feet, unless it can be established to the satisfaction of the local
<br />enforcement agency and concurred with by the Board, that such spacing
<br />would be impractical or unwarranted based on the site specific factors in
<br />subsection 17783.3 (a)(2).
<br />(2) The spacing of monitoring wells shall be determined based upon,
<br />but not limited to: the nature of the structure to be protected and its prox-
<br />imity to the refuse. Wells shall be spaced to align with gas permeable
<br />structural or stratigraphic features, such as dry sand or gravel, off-site or
<br />on-site structures, and areas of dead or stressed vegetation that might be
<br />due to gas migration.
<br />(3) Probe spacing shall be reduced as necessary to protect persons and
<br />structures threatened by landfill gas migration.
<br />(c) Depth
<br />(1) The depth of the wellbore shall equal the maximum depth of refuse
<br />as measured within 1,000 feet of the monitoring point. The number and
<br />depths of monitoring probes within the wellbore shall be installed in ac-
<br />cordance with the following criteria, except as specified in subsection
<br />17783.5(c)(2).
<br />(A) A shallow probe shall be installed 5 to 10 feet below the surface.
<br />(B) An intermediate probe shall be installed at or near half the depth
<br />of the wellbore.
<br />(C) A deep probe shall be set at or near the depth of the wellbore.
<br />(D) The specified depths of monitoring probes within the wellbore
<br />shall be adjusted, based on geologic data obtained during drilling, and
<br />probes shall be placed adjacent to soils which are most conductive to gas
<br />flow.
<br />(E) All probes shall be installed above the permanent low seasonal wa-
<br />ter table, above and below perched ground water, and above bedrock.
<br />(F) When the depth of the wellbore does not exceed 30 feet, the opera-
<br />tor may reduce the number of probes to two, with one probe located in
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