1. (1) subdivision (b) through paragraph (f)(1) of this section (which concern closure) apply to the owners and operators of all hazardous waste management facilities; and

2. (2) paragraph (f)(2) through subdivision (j) of this section (which concerns post-closure care) apply to the owners and operators of:

   1. (i) all hazardous waste disposal facilities;
   2. (ii) waste piles, and surface impoundments from which the owner or operator intends to remove the wastes at closure to the extent that these sections are made applicable to such facilities in sections 373-2.11(f) and 373-2.12(h) of this Subpart;
   3. (iii) tank systems that are required under section 373-2.10(h) of this Subpart to meet the requirements for landfills; and
   4. (iv) containment buildings that are required under section 373-2.30(c) of this Subpart to meet the requirements for landfills.

3. (3) The department may replace all or part of the requirements of this Subpart (and the unit-specific standards referenced in paragraph [b][3] of this section applying to a regulated unit), with alternative requirements set out in a permit or in an enforceable document (as defined in section 373-1.2[e][3] of this Part), where the department determines that:

   1. (i) the regulated unit is situated among solid waste management units (or areas of concern), a release has occurred, and both the regulated unit and one or more solid waste management unit(s) (or areas of concern) ae likely to have contributed to the release; and

   2. (ii) it is not necessary to apply the closure requirements of this section (and those referenced herein) because the alternative requirements will protect human health and the environment and will satisfy the closure performance standard of paragraph (b)(1) and (2) of this section.

      (b) Closure performance standard.

      The owner or operator must close the facility in a manner that:

4. (1) minimizes the need for further maintenance; and
5. (2) controls, minimizes or eliminates, to the extent necessary to protect human health and the environment, post-closure escape of hazardous waste, hazardous constituents, leachate, contaminated runoff, or hazardous waste decomposition products to the ground or surface waters or to the atmosphere; and

6. (3) complies with the closure requirements of this Subpart, including but not limited to, the requirements of sections 373-2.9(i), 373-2.10(h), 373-2.11(f), 373-2.12(h), 373-2.13(h), 373-2.14(g), 373-2.15(h), 373-2.24(b), (c) and (d), and 373-2.30(c) of this Subpart.

   (c) Closure plan; amendment of plan.

7. (1) Written plan.

   1. (i) The owner or operator of a hazardous waste management facility must have a written closure plan. In addition, certain surface impoundments and waste piles from which the owner or operator intends to remove or decontaminate the hazardous waste at partial or final closure are required by sections 373-2.11(f) and 373-2.12(h) of this Subpart to have contingent closure plans. The plan must be submitted with the permit application, in accordance with section 373-1.5(a)(2)(xiii) of this Part, and approved by the commissioner as part of the permit issuance procedures under Part 621 of this Title. In accordance with section 373-1.6(c) of this Part, the approved closure plan will become a condition of any Part 373 permit.
   2. (ii) The commissioner's approval of the plan must ensure that the approved closure plan is consistent with subdivisions (b) through (f) of this section and the applicable requirements of sections 373-2.6, 373-2.9(i), 373-2.10(h). 373-2.11(f), 373-2.12(h), 373-2.13(h), 373-2.14(g), 373-2.15(h), 373-2.24(b) and 373-2.30(c) of this Subpart. Until final closure is completed and certified in accordance with paragraph (f)(1) of this section, a copy of the approved plan and all approved revisions must be furnished to the commissioner upon request, including requests by mail.

8. (2) Content of plan. The plan must identify steps necessary to perform partial and/or final closure of the facility at any point during its active life. The closure plan must include, at least:

   1. (i) a description of how each hazardous waste management unit at the facility will be closed in accordance with subdivision (b) of this section;
   2. (ii) a description of how final closure of the facility will be conducted in accordance with subdivision (b) of this section. The description must identify the maximum extent of the operations which will be unclosed during the active life of the facility;
   3. (iii) an estimate of the maximum inventory of hazardous wastes ever onsite over the active life of the facility, and a detailed description of the methods to be used during partial closures and final closure, including but not limited to methods for removing, transporting, treating, storing or disposing of all hazardous wastes, and identification of the types of the offsite hazardous waste management units to be used, if applicable;
   4. (iv) a detailed description of the steps needed to remove or decontaminate all hazardous waste residues and contaminated containment system components, equipment, structures and soils during partial and final closure, including but not limited to procedures for cleaning equipment and removing contaminated soils, methods for sampling and testing surrounding soils, and criteria for determining the extent of decontamination required to satisfy the closure performance standard;
   5. (v) a detailed description of other activities necessary during the closure period to ensure that all partial closures and final closure satisfy the closure performance standards, including but not limited to groundwater monitoring, leachate collection, and run-on and runoff control;
   6. (vi) a schedule for closure of each hazardous waste management unit and for final closure of the facility. The schedule must include, at a minimum, the total time required to close each hazardous waste management unit and the time required for intervening closure activities which will allow tracking of the progress of partial and final closure (for example, in the case of a landfall unit, estimates of the time required to treat or dispose of all hazardous waste inventory and of the time required to place a final cover must be included);
   7. (vii) for facilities that use trust funds to establish financial assurance under section 373-2.8(d) or (f) of this Subpart and that are expected to close prior to the expiration of the permit, an estimate of the expected year of final closure; and
   8. (viii) for facilities where the department has applied alternative requirements at a regulated unit under sections 373-2.6(a)(6) and/or 373-2.8(a)(4) of this Subpart and/or paragraph (a)(3) of this section, either the alternative requirements applying to the regulated unit, or a reference to the enforceable document containing those alternative requirements.

9. (3) Amendment of plan. The owner or operator must submit a written request for a permit modification to authorize a change in operating plans, facility design, or the approved closure plan in accordance with the procedures in Subpart 373-1 of this Part and Part 621 of this Title. The written request must include a copy of the amended closure plan for approval by the commissioner.

   1. (i) The owner or operator may submit a written request to the commissioner for a permit modification to amend the closure plan at any time prior to the notification of partial or final closure of the facility.

   2. (ii) The owner or operator must submit a written request for a permit modification to authorize a change in the approved closure plan whenever:

      1. (a) changes in operating plans or facility design affect the closure plan;
      2. (b) there is a change in the expected year of closure, if applicable;
      3. (c) in conducting partial or final closure activities, unexpected events require a modification of the approved closure plan; or
      4. (d) the owner or operator requests the department to apply alternative requirements to a regulated unit under sections 373-2.6(a)(6) and/or 373-2.8(a)(4) of this Subpart and/or paragraph (a)(3) of this section.
   3. (iii) The owner or operator must submit a written request for a permit modification, including a copy of the amended closure plan for approval at least 60 days prior to the proposed change in facility design or operation, or no later than 60 days after an unexpected event has occurred which has affected the closure plan. If a unexpected event occurs during the partial or final closure period, the owner or operator must request a permit modification no later than 30 days after the unexpected event. An owner or operator of a surface impoundment or waste pile who intends to remove all hazardous waste at closure and is not otherwise required to prepare a contingent closure plan under section 373-2.11(f) or 373-2.12(h) of this Subpart must submit an amended closure plan to the commissioner no later than 60 days from the date that the owner or operator or commissioner determines that the hazardous waste management unit must be closed as a landfill subject to the requirements of section 373-2.14(g) of this Subpart, or no later than 30 days from that date if the determination is made during partial or final closure. The commissioner will approve, disapprove or modify this amended plan in accordance with the procedures in Subpart 373-1 of this Part and Part 621 of this Title. In accordance with section 373-1.6 of this Part, the approved closure plan will become a condition of any Part 373 permit issued.
   4. (iv) The commissioner may request modifications to the plan under the conditions described in subparagraph (ii) of this paragraph. The owner or operator must submit the modified plan within 60 days of the commissioner's request, or within 30 days if the change in facility conditions occurs during partial or final closure. Any modifications requested by the commissioner will be approved in accordance with the procedures in Subpart 373-1 of this Part and Part 621 of this Title.

10. (4) Notification of partial closure and final closure.

    1. (i) The owner or operator must notify the department in writing at least 60 days prior to the date on which he expects to begin closure of a surface impoundment, waste pile, land treatment or landfill unit, or final closure of a facility with such a unit. The owner or operator must notify the department in writing at least 45 days prior to the date on which he expects to begin final closure of a facility with only treatment or storage tanks, container storage, or incinerator units to be closed. The owner or operator must notify the department in writing at least 45 days prior to the date on which he expects to begin partial or final closure of a boiler or industrial furnace, whichever is earlier.

    2. (ii) The date when the owner or operator "expects to begin closure" must be either:

       1. (a) no later than 30 days after the date on which any hazardous waste management unit receives the known final volume of hazardous wastes or, if there is a reasonable possibility that the hazardous waste management unit will receive additional hazardous wastes, no later than one year after the date on which the unit received the most recent volume of hazardous wastes. If the owner or operator of a hazardous waste management unit can demonstrate to the commissioner that the hazardous waste management unit or facility has the capacity to receive additional hazardous wastes, and the owner or operator has taken, and will continue to take, all steps to prevent threats to human health and the environment, including compliance with all applicable permit requirements, the commissioner may approve an extension to this one-year limit; or
       2. (b) for units meeting the requirements of paragraph (d)(4) of this section, no later than 30 days after the date on which the hazardous waste management unit receives the known final volume of nonhazardous wastes, or if there is a reasonable possibility that the hazardous waste management unit will receive additional nonhazardous wastes, no later than one year after the date on which the unit received the most recent volume of nonhazardous wastes. If the owner or operator of a hazardous waste management unit can demonstrate to the commissioner that the hazardous waste management unit or facility has the capacity to receive additional nonhazardous wastes and the owner or operator has taken, and will continue to take, all steps to prevent threats to human health and the environment, including compliance with all applicable permit requirements, the commissioner may approve an extension to this one-year limit.
    3. (iii) If the facility's permit is terminated, or if the facility is otherwise ordered, by judicial decree or final order under article 71 of ECL, to cease receiving hazardous wastes or to close, then the requirements of this paragraph do not apply. However, the owner or operator must close the facility in accordance with the deadlines established in subdivision (d) of this section.
11. (5) Removal of wastes and contamination or dismantling of equipment. Nothing in this subdivision shall preclude the owner or operator from removing hazardous wastes and decontaminating or dismantling equipment in accordance with the approved partial or final closure plan at any time before or after notification of partial or final closure.

12. (d) Closure; time allowed for closure.

    1. (1) Within 90 days after receiving the final volume of hazardous wastes, or the final volume of nonhazardous wastes if the owner or operator complies with all applicable requirements in paragraphs (4) and (5) of this subdivision, at a hazardous waste management unit or facility, the owner or operator must treat, remove from the unit or facility, or dispose of onsite, all hazardous wastes in accordance with the approved closure plan. The commissioner may approve a longer period if the owner or operator complies with all applicable requirements for requesting a modification to the permit and demonstrates that:

       1. (a) the activities required to comply with this subdivision will, of necessity, take longer than 90 days to complete; or

          1. (1) the hazardous waste management unit or facility has the capacity to receive additional hazardous wastes, or has the capacity to receive nonhazardous wastes if the owner or operator complies with paragraphs (4) and (5) of this subdivision;
          2. (2) there is a reasonable likelihood that the owner or operator, or a person other than the owner or operator, will recommence operation of the hazardous waste management unit or the facility within one year; and
          3. (3) closure of the hazardous waste management unit or facility would be incompatible with continued operation of the site; and

          (b)

       2. (ii) the owner or operator has taken and will continue to take all steps to prevent threats to human health and the environment, including compliance with all applicable permit requirements.

       (i)

    2. (2) The owner or operator must complete partial and final closure activities in accordance with the approved closure plan and within 180 days after receiving the final volume of hazardous wastes, or the final volume of nonhazardous wastes if the owner or operator complies with all applicable requirements in paragraphs (4) and (5) of this subdivision, at the hazardous waste management unit or facility. The commissioner may approve an extension to the closure period if the owner of operator complies with all applicable requirements for requesting a modification to the permit and demonstrates that:

       1. (a) the partial or final closure activities will, of necessity, take longer than 180 days to complete; or

          1. (1) the hazardous waste management unit or facility has the capacity to receive additional hazardous wastes, or has the capacity to receive nonhazardous wastes if the owner or operator complies with paragraphs (4) and (5) of this subdivision; and
          2. (2) there is reasonable likelihood that the owner or a person other than the owner or operator will recommence operation of the hazardous waste management unit or the facility within one year; and
          3. (3) closure of the hazardous waste management unit or facility would be incompatible with continued operation of the site; and

          (b)

       2. (ii) the owner or operator has taken and will continue to take all steps to prevent threats to human health and the environment from the unclosed but not operating hazardous waste management unit or facility, including compliance with all applicable permit requirements.

       (i)

    3. (3) The demonstration referred to in subparagraphs (1)(i) and (2)(i) of this subdivision must be made as follows:

       1. (i) the demonstrations in subparagraph (1)(i) of this subdivision must be made at least 30 days prior to the expiration of the 90-day period in subparagraph (1)(i) of this subdivision; and
       2. (ii) the demonstration in subparagraph (2)(i) of this subdivision must be made at least 30 days prior to the expiration of the 180-day period in paragraph (2) of this subdivision, unless the owner or operator is otherwise subject to the deadlines in paragraph (4) of this subdivision.

    4. (4) The commissioner may allow an owner or operator to receive only nonhazardous wastes in a landfill, land treatment unit, or surface impoundment unit after the final receipt of hazardous wastes at that unit if:

       1. (i) the owner or operator requests a permit modification in compliance with all applicable requirements in Subpart 373-1 and Part 621 of this Title and in the permit modification request demonstrates that:

          1. (a) the unit has the existing design capacity as indicated on the Part 373 application to receive nonhazardous wastes; and
          2. (b) there is a reasonable likelihood that the owner or operator or another person will receive nonhazardous wastes in the unit within one year after the final receipt of hazardous wastes; and
          3. (c) the nonhazardous wastes will not be incompatible with any remaining wastes in the unit, or with the facility design and operating requirements of the unit or facility under this Part; and
          4. (d) closure of the hazardous waste management unit would be incompatible with continued operation of the unit or facility; and
          5. (e) the owner or operator is operating and will continue to operate in compliance with all applicable permit requirements; and
       2. (ii) the request to modify the permit includes an amended waste analysis plan, ground- water monitoring and response program, human exposure assessment required under section 373-1.5(d) and (h) of this Part, and closure and post-closure plans, and updated cost estimates and demonstrations of financial assurance for closure and post-closure care as necessary and appropriate, to reflect any changes due to the presence of hazardous constituents in the nonhazardous wastes, and changes in closure activities, including the expected year of closure if applicable under subparagraph (c)(2)(vii) of this section, as a result of the receipt of nonhazardous wastes following the final receipt of hazardous wastes; and
       3. (iii) the request to modify the permit includes revisions, as necessary and appropriate, to affected conditions of the permit to account for the receipt of non-hazardous wastes following receipt of the final volume of hazardous wastes; and
       4. (iv) the request to modify the permit and the demonstrations referred to in subparagraphs (i) and (ii) of this paragraph are submitted to the commissioner no later than 120 days prior to the date on which the owner or operator of the facility receives the known final volume of hazardous wastes at the unit, or no later than 90 days after the effective date of this rule, whichever is later.

    5. (5) In addition to the requirements in paragraph (4) of this subdivision, an owner or operator of a hazardous waste surface impoundment that is not in compliance with the liner and leachate collection system requirements in sections 373-2.11 and 373-2.14 of this Subpart, or section 373-3.11 or 373-3.14 of this Part must:

       1. (i) Submit with the request to modify the permit:

          1. (a) a contingent corrective measures plan, unless a corrective action plan has already been submitted under section 373-2.6(j) of this Part; and
          2. (b) a plan for removing hazardous wastes in compliance with subparagraph (5)(ii) of this subdivision; and
       2. (ii) Remove all hazardous wastes from the unit by removing all hazardous liquids, and removing all hazardous sludges to the extent practicable without impairing the integrity of the liner(s), if any.
       3. (iii) Removal of hazardous wastes must be completed no later than 90 days after the final receipt of hazardous wastes. The commissioner may approve an extension to this deadline if the owner or operator demonstrates that the removal of hazardous wastes will, of necessity, take longer than the allotted period to complete and that an extension will not pose a threat to human health and the environment.

       4. (iv) If a release that is a statistically significant increase (or decrease in the case of pH) over background values for detection monitoring parameters or constituents specified in the permit or that exceeds the facility's groundwater protection standard at the point of compliance, if applicable, is detected in accordance with the requirements in section 373-2.6 of this Subpart, the owner or operator of the unit:

          1. (a) must implement corrective measures in accordance with the approved contingent corrective measures plan required by subparagraph (i) of this paragraph no later than one year after detection of the release, or approval of the contingent corrective measures plan, whichever is later;
          2. (b) may continue to receive wastes at the unit following detection of the release only if the approved corrective measures plan includes a demonstration that continued receipt of wastes will not impede corrective action; and
          3. (c) may be required by the commissioner to implement corrective measures in less than one year or to cease the receipt of wastes until corrective measures have been implemented if necessary to protect human health and the environment.
       5. (v) During the period of corrective action, the owner or operator shall provide annual reports to the department describing the progress of the corrective action program, compile all groundwater monitoring data, and evaluate the effect of the continued receipt of nonhazardous wastes on the effectiveness of the corrective action. The department may require the owner or operator to report semi-annually as needed to evaluate the progress of the corrective action program.
       6. (vi) The commissioner may require the owner or operator to commence closure of the unit if the owner or operator fails to implement corrective action measures in accordance with the approved contingent corrective measures plan within one year as required in subparagraph (iv) of this paragraph, or fails to make substantial progress in implementing corrective action and achieving the facility's groundwater protection standard or background levels if the facility has not yet established a ground-water protection standard.

       7. (vii) If the owner or operator fails to implement corrective measures as required in subparagraph (iv) of this paragraph, or if the commissioner determines that substantial progress has not been made pursuant to subparagraph (vi) of this paragraph, the commissioner shall:

          1. (a) notify the owner or operator in writing that the department is initiating a modification to the permit, pursuant to Part 621, to require the initiation of closure in accordance with the deadlines in paragraphs (1) and (2) of this subdivision and provide a detailed statement of reasons for this determination.

             (e) Disposal or decontamination of equipment, structures and soils.

             During the partial and final closure periods, all contaminated equipment, structures and soils must be properly disposed of or decontaminated unless otherwise specified in section 373-2.10(b), 373-2.11(f), 373-2.12(h), 373-2.13(h) or 373-2.14(g), or under the authority of section 373-2.24(b) and (d) of this Subpart. By removing any hazardous waste or hazardous constituents during partial and final closure, the owner or operator may become a generator of hazardous waste and must handle that waste in accordance with all applicable requirements of Part 372 of this Title.

13. (f) Certification of closure and survey plat.

    1. (1) Certification of closure. Within 60 days of completion of final closure of a facility, or within 60 days of partial closure of any hazardous waste management unit, the owner or operator must submit to the commissioner, by registered mail, a certification that the hazardous waste management unit or facility, as applicable, has been closed in accordance with the specifications in the approved closure plan. The certification must be signed by the owner or operator and by an independent professional engineer registered in New York. Documentation supporting the independent registered professional engineer's certification must be furnished to the commissioner upon request until the owner or operator is released from the financial assurance requirements for closure under section 373-2.8(d)(8) of this Subpart.
    2. (2) Survey plat. No later than the submission of the certification of closure of each hazardous waste disposal unit, the owner or operator must submit to the local zoning authority, or the authority with jurisdiction over local land use, and to the county clerk in the county in which the facility is located, and to the commissioner, a survey plat indicating the location and dimensions of landfill cells or other hazardous waste disposal units with respect to permanently surveyed benchmarks. This plat must be prepared and certified by a professional land surveyor registered in New York. The plat filed with the local zoning authority, or the authority with jurisdiction over local land use, and with the county clerk in the county in which the facility is located, must contain a note, prominently displayed, which states the owner's or operator's obligation to restrict disturbance of the hazardous waste disposal unit in accordance with the applicable regulations of this section.

14. (g) Post-closure care and use of property.

    1. (i) Post-closure care for each hazardous waste management unit subject to the requirements of subdivisions (g) through (j) of this section must begin after completion of closure of the unit and continue for 30 years after that date, and must consist of at least the following:

       1. (a) monitoring and reporting in accordance with the requirements of sections 373-2.6, 373-2.11, 373-2.12, 373-2.13, 373-2.14 and 373-2.24 of this Subpart; and
       2. (b) maintenance and monitoring of waste containment systems in accordance with the requirements of sections 373-2.6, 373-2.12, 373-2.13, 373-2.14 and 373-2.24 of this Subpart.

    2. (ii) Any time preceding partial closure of a hazardous waste management unit subject to post-closure care requirements or final closure, or at any time during the post-closure period for a particular unit, the commissioner may, in accordance with the permit modification procedures in Subpart 373-1 of this Part and Part 621 of this Title:

       1. (a) shorten the post-closure care period applicable to the hazardous waste management unit or facility (if all disposal units have been closed) if the commissioner finds that the reduced period is sufficient to protect human health and the environment (e.g., leachate or ground-water monitoring results, characteristics of the hazardous wastes, application of advanced technology, or alternative disposal, treatment or reuse techniques indicate that the hazardous waste management unit or facility is secure); or
       2. (b) extend the post-closure care period applicable to the hazardous waste management unit or facility if the commissioner finds that the extended period is necessary to protect human health and the environment (e.g., leachate or ground-water monitoring results indicate a potential for migration of hazardous wastes at levels which may be harmful to human health and the environment).

    3. (2) The commissioner may require, at partial and final closure, continuation of any of the security requirements of section 373-2.2(f) of this Subpart during part or all of the post-closure period when:

       1. (i) hazardous wastes may remain exposed after completion of partial or final closure; or
       2. (ii) access by the public or domestic livestock may pose a hazard to human health.

    4. (3) Post-closure use of property on or in which hazardous wastes remain after partial or final closure must never be allowed to disturb the integrity of the final cover, liners, or any other components of the containment system, or the function of the facility's monitoring systems, unless the commissioner finds that the disturbance:

       1. (i) is necessary to the proposed use of the property, and will not increase the potential hazard to human health or the environment; or
       2. (ii) is necessary to reduce a threat to human health or the environment.

    5. (4) All post-closure care activities must be in accordance with the provisions of the approved post-closure plan as specified in subdivision (h) of this section.

       (h) Post-closure plan; amendment of plan.

    6. (1) Written plan. The owner or operator of a hazardous waste disposal unit must have a written post-closure plan. In addition, certain surface impoundments and waste piles from which the owner or operator intends to remove or decontaminate the hazardous wastes at partialor final closure are required by sections 373-2.11(f) and 373-2.12(h) of this Subpart to have contingent post-closure plans. Owners or operators of surface impoundments and waste piles not otherwise required to prepare contingent post-closure plans under sections 373-2.11(f) and 373-2.12(h) must submit a post-closure plan to the commissioner within 90 days from the date that the owner or operator or commissioner determines that the hazardous waste management unit must be closed as a landfill, subject to the rerquirements of subdivisions (g)-(j) of this section. The plan must be submitted with the permit application, in accordance with section 373-1.5(a)(2)(xiii) of this Part, and approved by the commissioner as part of the permit issuance procedures under Part 621 of this Title. In accordance with section 373-1.6(c) of this Part, the approved post-closure plan will become a condition of any Part 373 permit issued.

    7. (2) For each hazardous waste management unit subject to the requirements of this subdivision, the post-closure plan must identify the activities that will be carried on after closure of each disposal unit and the frequency of these activities, and include at least:

       1. (i) a description of the planned monitoring activities and frequencies at which they will be performed to comply with sections 373-2.6, 373-2.11, 373-2.12, 373-2.13, 373-2.14 and 373-2.24 of this Subpart during the post-closure care period;

       2. (ii) a description of the planned maintenance activities, and frequencies at which they will be performed, to ensure:

          1. (a) the integrity of the cap and final cover or other containment systems in accordance with the requirements of sections 373-2.6, 373-2.11, 373-2.12, 373-2.13, 373-2.14 and 373-2.24 of this Subpart; and
          2. (b) the function of the monitoring equipment in accordance with the requirements of sections 373-2.6, 373-2.11, 373-2.12, 373-2.13, 373-2.14 and 373-2.24 of this Subpart;
       3. (iii) the name, address and phone number of the person or office to contact about the hazardous waste disposal unit or facility during the post-closure care period; and
       4. (iv) for facilities where the department has applied alternative requirements at a regulated unit under sections 373-2.6(a)(6) and/or 373-2.8(a)(4) of this Subpart and/or paragraph (a)(3) of this section, either the alternative requirements that apply to the regulated unit, or a reference to the enforceable document containing those requirements.
    8. (3) Until final closure of the facility, a copy of the approved post-closure plan must be furnished to the commissioner upon request, including a request by mail. After final closure has been certified, the person or office specified in subparagraph (2)(iii) of this subdivision must keep the approved post-closure plan during the remainder of the post-closure period.

    9. (4) Amendment of plan. The owner or operator must request a permit modification to authorize a change in the approved post-closure plan in accordance with the applicable requirements of Subpart 373-1 of this Part and Part 621 of this Title. The written request must include a copy of the amended post-closure plan for approval by the commissioner.

       1. (i) The owner or operator may submit a written request to the commissioner for a permit modification to amend the post-closure plan at any time during the active life of the facility or during the post-closure care period.

       2. (ii) The owner or operator must submit a written request for a permit modification to authorize a change in the approved post-closure plan whenever:

          1. (a) changes in operating plans or facility design affect the approved post-closure plan;
          2. (b) there is a change in the expected year of final closure, if applicable;
          3. (c) events which occur during the active life of the facility, including partial and final closures, affect the approved post-closure plan; or
          4. (d) the owner or operator requests the department to apply alternative requirements to a regulated unit under sections 373-2.6(a)(6) and/or 373-2.8 (a)(4) of this Subpart and/or paragraph (a)(3) of this section.
       3. (iii) The owner or operator must submit a written request for a permit modification at least 60 days prior to the proposed change in facility design or operation, or no later than 60 days after an unexpected event has occurred which has affected the post-closure plan. An owner or operator of a surface impoundment or waste pile that intends to remove all hazardous waste at closure and is not otherwise required to submit a contingent post-closure plan under sections 373-2.11(f) and 373-2.12(h) of this Subpart must submit a post-closure plan to the commissioner no later than 90 days after the date that the owner or operator or commissioner determines that the hazardous waste management unit must be closed as a landfill, subject to the requirements of section 373-2.14(g) of this Subpart. The commissioner will approve, disapprove or modify this plan in accordance with the procedures in Subpart 373-1 of this Part and Part 621 of this Title. In accordance with section 373-1.6 of this Part, the approved post-closure plan will become a permit condition.

       4. (iv) The commissioner may request modifications to the plan under the conditions described in subparagraph (ii) of this paragraph. The owner or operator must submit the modified plan no later than 60 days after the commissioner's request, or no later than 90 days if the unit is a surface impoundment or waste pile not previously required to prepare a contingent post-closure plan. Any modifications requested by the commissioner will be approved, disapproved or modified in accordance with the procedures in Subpart 373-1 of this Part and Part 621 of this Title.

          (i) Post-closure notices.

    10. (1) No later than 60 days after certification of closure of each hazardous waste disposal unit, the owner or operator must submit to the local zoning authority, or the authority with jurisdiction over local land use, and to the county clerk in the county in which the facility is located, and to the commissioner, a record of the type, location and quantity of hazardous wastes disposed of within each cell or other disposal unit of the facility. For hazardous wastes disposed of before January 12, 1981, the owner or operator must identify the type, location and quantity of the hazardous wastes to the best of his or her knowledge and in accordance with any records the owner or operator has kept.

    11. (2) Within 60 days of certification of closure of the first hazardous waste disposal unit, and within 60 days of certification of closure of the last hazardous waste disposal unit, the owner or operator must:

        1. (i) record with the county clerk in the county in which the facility is located a notation on the deed to the facility property—or on some other instrument which is normally examined during title search—that will in perpetuity notify any potential purchaser of the property that:

           1. (a) the land has been used to manage hazardous wastes;
           2. (b) its use is restricted under this section; and
           3. (c) the survey plat and record of the type, location and quantity of hazardous wastes disposed of within each cell or other hazardous waste disposal unit of the facility required by this subdivision and subdivision (f) of this section have been filed with the local zoning authority, or the authority with jurisdiction over local land use, and with the county clerk in the county in which the facility is located, and with the commissioner; and
        2. (ii) submit a certification, signed by the owner or operator, that the notation specified in subparagraph (i) of this paragraph has been recorded, including a copy of the document in which the notation has been placed, to the commissioner.

    12. (3) If the owner or operator or any subsequent owner or operator of the land upon which a hazardous waste disposal unit is located wishes to remove hazardous wastes and hazardous waste residues, the liner, if any, or contaminated soils, the owner or operator must request a modification to the post-closure permit in accordance with the applicable requirements in Subpart 373-1 of this Part and Part 621 of this Title. The owner or operator must demonstrate that the removal of hazardous wastes will satisfy the criteria of paragraph (g)(3) of this section. By removing hazardous waste, the owner or operator may become a generator of hazardous waste and must manage it in accordance with all applicable requirements of Parts 372 and 373 of this Title. If the owner or operator is granted a permit modification or otherwise granted approval to conduct such removal activities, the owner or operator may request that the commissioner approve either:

        1. (i) the removal of the notation on the deed to the facility property or other instrument normally examined during title search; or

        2. (ii) the addition of a notation to the deed or instrument indicating the removal of the hazardous waste.

           (j) Certification of completion of post-closure care.

           No later than 60 days after completion of the established post-closure care period for each hazardous waste disposal unit, the owner or operator must submit to the commissioner, by registered mail, a certification that the post-closure care period for the hazardous waste disposal unit was performed in accordance with the specifications in the approved post-closure plan. The certification must be signed by the owner or operator and independent professional engineer registered in New York. Documentation supporting the professional engineer's certification must be furnished to the commissioner upon request until the owner or operator is released from the financial assurance requirements for post-closure care under section 373-2.8(f)(8) of this Subpart.

    (1)

(a) Applicability.

Except as section 373-2.1(a) of this Subpart provides otherwise: