§ 21750. SWRCB--Waste Management Unit (Unit) Characteristics and Attributes to Be Described in ...
27 CA ADC § 21750Barclays Official California Code of Regulations
Barclays California Code of Regulations
Title 27. Environmental Protection
Division 2. Solid Waste (Refs & Annos)
Subdivision 1. Consolidated Regulations for Treatment, Storage, Processing or Disposal of Solid Waste
Chapter 4. Documentation and Reporting for Regulatory Tiers, Permits, WDRs, and Plans
Subchapter 3. Development of Waste Discharge Requirements (WDRs) and Solid Waste Facility Permits
Article 4. SWRCB--Development of Waste Discharge Requirements (WDRs)
27 CCR § 21750
§ 21750. SWRCB--Waste Management Unit (Unit) Characteristics and Attributes to Be Described in the ROWD. [C15: § 2595 & § 2547(a) // T14: § 17777, § 18260, § 18263, & § 18264]
(a) Identify Potential Impairment--Dischargers shall provide in the report of waste discharge (“ROWD”, including any such report integrated into a Joint Technical Document (JTD), pursuant to § 21585) an analysis describing how the ground and surface water could affect the Unit and how the Unit, including how any waste, if it escapes from the Unit, could affect the beneficial uses of ground water bodies (including, but not limited to, any aquifers underlying the facility) and surface water bodies. The RWQCB shall use this information to determine the suitability of the Unit with respect to ground water protection and avoidance of geologic hazards and to demonstrate that the Unit meets the classification criteria set forth in Article 3, Subchapter 2, Chapter 3, Subdivision 1 of this division (§ 20240 et seq.).
(b) Support Proposed Classification--Dischargers shall provide the data required by this section regarding the physical characteristics of the Unit and the surrounding region in order to demonstrate suitability for the appropriate Unit classification. The ROWD shall present this information in understandable written, tabular, and graphic format, as appropriate, and this information shall be at a level of detail appropriate to support the RWQCB's approving the Unit's proposed classification. Maps, plans, diagrams, and other graphics shall be prepared to appropriate scale and each shall include a legend identifying the information presented. All sources of data shall be identified.
(c) Restate, Where Appropriate--If a report submitted by a discharger refers to another source, the relevant information from that source shall be restated in the report. If the source is not generally available, the relevant portion(s) of the source shall be included verbatim in the report as an appendix.
(2) Floodplain--Identification of whether the facility is located within a 100-year floodplain. This identification must indicate the source of data for such determination and include a copy of the relevant Federal Emergency Management Agency (FEMA) flood map, if used, or the calculations and maps used where a FEMA map is not available. The submittal shall also identify the 100-year floodplain and any other special flooding factors (e.g. wave action) which must be considered in designing, constructing, operating, or maintaining the facility to withstand washout from a 100-year flood. Dischargers having facilities located in the 100-year floodplain shall provide the following information:
(e) Climatology--Dischargers shall calculate required climatologic values for Units from measurements made at a nearby climatologically similar station. In addition to the required calculations for each Unit, dischargers shall provide the source data from which such values were calculated, together with the name, location, and period of record of the measuring station.
(5) Runoff Volume/Pattern--Projected volume and pattern of runoff for the Unit including peak stream discharges associated with the storm conditions specified as design criteria for the particular class of Unit, as prescribed in Table 4.1 of Article 4, Subchapter 2, Chapter 3, Subdivision 1 of this division.
(2) Materials--A description of natural geologic materials in and underlying the location of both the Unit and its surroundings, including identification of each rock's type, relative age, distribution and dimension features, physical characteristics, special physical or chemical features (e.g., alteration other than weathering), distribution, the extent of any weathered zones, susceptibility to natural surface/near-surface processes, and all other pertinent lithologic data, all in accordance with current industry-wide practice [e.g., California Division of Mines and Geology's (CDMG's) Note 44 Guidelines for Preparing Engineering Geologic Reports (April, 1986)].
(3) Geologic Structure--A description of the natural geologic structure of materials underlying the location of the Unit and its surroundings, including: the attitude of bedding (if any); thickness of beds (if any); the location, attitude, and condition (tight, open, clay- or gypsum-filled, etc.) of any fractures; the nature, type (anticlinal, synclinal, etc.) and orientation of any folds; the location (surface and subsurface), age, type of surface displacement, attitude, and nature [e.g., aperture, amount of brecciation, degree of alteration and type of alteration products (tight, gouge-filled, etc.)] of any faults; and all other pertinent, related structural data, (all of the foregoing) in accordance with current industry-wide practices [e.g., CDMG's Note 42 “Guidelines to Geologic/Seismic Reports” (May, 1986), and CDMG Note 49 “Guidelines for Evaluating the Hazard of Surface Fault Rupture” (May, 1986)].
(5) Stability Analysis--A stability analysis, including a determination of the expected peak ground acceleration at the Unit associated with the maximum credible earthquake (for Class II waste management units) or the maximum probable earthquake (for Class III landfills). This stability analysis shall be included as part of the ROWD (or JTD) for the proposed Unit, and an updated stability analysis (if the original analysis no longer reflects the conditions at the Unit) shall be included as part of the final closure and post-closure maintenance plan. The methodology used in the stability analysis shall consider regional and local seismic conditions and faulting. Data and procedures shall be consistent with current practice and shall be based on an identified procedure or publication. The stability analyses shall include modifications to allow for site-specific surface and subsurface conditions. The peak ground acceleration so determined shall be the stability and factors of safety for all embankments, cut slopes, and associated landfills during the design life of the unit. For landfills and for waste piles and surface impoundments closed as landfills, final cover slopes shall be designed in compliance with the slope requirements of § 21090.
(B) The stability analysis shall address all portions of the Unit and its immediate surroundings that are located in areas subject to liquefaction or unstable areas with poor foundation conditions, as identified either in the ROWD or in the Seismic Safety Element of the County General Plan, and shall address all portions of the Unit that incorporate geomembranes as part of the Unit foundation or containment system (including the final cover).
(C) The stability analysis shall be prepared by a registered civil engineer or certified engineering geologist. Except as otherwise provided in ¶(f)(5)(D), the report must indicate a factor of safety for the critical slope of at least 1.5 under dynamic conditions. Regardless of the analysis method used, the stability analysis report shall include at least the following elements:
1. report preparation shall be in accordance with CDMG Note Number 42, “Guidelines for Geologic/Seismic Reports,” May 1986, and CDMG Note Number 44, “Guidelines for Preparing Engineering Geologic Reports,” April 1986, [both available from the California Division of Mines and Geology (CDMG), 801 K Street, MS14-34, Sacramento, CA 95814-3532, phone 916-445-5716] which are both incorporated by reference, and shall include the following seismicity elements:
4. a profile of the critical slope geometry showing the various layers including the proposed fill surface, final cover, mitigation berms, lifts or cells of waste, fluid levels, or any feature that may serve to reduce the stability of the slope or may represent a potential failure surface; and the proposed ground surface, soil or rock layers and structural features;
5. the engineering properties of the refuse and other layers making up the site, shall be analyzed when determining the critical slope. These properties shall include a site-specific assessment of the strength parameters, the unit weight and, if using ¶(f)(5)(D), the shear wave velocity of each of these layers;
7. the maximum expected horizontal acceleration in rock at the site determined for the design earthquake for the Unit under § 20370 [i.e., for Class II Units, the maximum credible earthquake (MCE), and for Class III Units, at least the maximum probable earthquake (MPE)], as supported by data and analysis. For Class III landfills, the maximum expected acceleration in rock from the MCE can be used instead of the MPE;
(D) In lieu of achieving a factor of safety of 1.5 under dynamic conditions, pursuant to ¶(f)(5)(C), the discharger can utilize a more rigorous analytical method that provides a quantified estimate of the magnitude of movement. In this case, the report shall demonstrate that this amount of movement can be accommodated without jeopardizing the integrity of the Unit's foundation or the structures which control leachate, surface drainage, erosion, or gas.
(7) Fault Identification & Proximity--Dischargers who own or operate new Class II Units [including expansions (of new or existing Units) built after November 27, 1984] shall identify any known Holocene fault within 200 feet of the facility (including any portions of such a fault underlying the Unit) in accordance with a procedure approved by the RWQCB. Dischargers who own or operate new Class III landfills [including expansions (of new or existing) landfills] shall identify any known Holocene fault underlying the landfill according to a procedure approved by the RWQCB. After July 18, 1997, dischargers required to submit a slope stability report, under ¶(f)(5), shall provide a review of historical seismicity within a 100 km (62 mile) radius of the facility, including the name of the fault, type of faulting, activity on the fault, design event for the fault (for Class II Units, the fault's MCE, for Class III Units, the fault's MPE), distance from the facility, the expected ground motions (horizontal and vertical) at the facility resulting from the fault's design event, the expected duration of strong motion at the site resulting from the fault's design event, and an estimation of the cumulative duration of strong motion from aftershocks.
(4) Capillary Rise--Estimates of the height to which water rises due to capillary forces above the uppermost ground water zone(s) beneath and within one mile of the waste management facility perimeter. These estimates shall include an evaluation of the methods and rationale used in their development.
(6) Water Quality--An evaluation, supported by water quality analyses, of the quality of water known to exist under or within one mile of the waste management facility's perimeter, including all data necessary to establish the water quality protection standard (Water Standard) for the Unit, under § 20390.
(B) In case an evaluation monitoring program is initiated prior to fulfilling the requirements of ¶(g)(7)(A), the discharger shall, where feasible, establish background water quality based on a combination of all background data then available--including (1) all background data so far taken to satisfy ¶(g)(7)(A), (2) all background data obtained during accelerated sampling efforts under § 20425(b), and (3) all appropriate water quality data from before WDRs were issued--in lieu of the one-year monitoring program under ¶(g)(7)(A).
(D) In developing the data base used to determine a background value for each indicator parameter or waste constituent in ground water, the discharger shall take a minimum of one sample from each well used to determine background. A minimum of four samples shall be taken from the entire system used to determine background water quality, each time the system is sampled. In a case where there is only one background well, the four measurements per quarter shall be obtained by taking four independent samples, pursuant to § 20415(e)(12)(B), and conducting separate analyses for each such sample.
(i) Preliminary Closure Plan--For any proposed Unit (including a proposed lateral expansion of a Unit's RWQCB-Permitted Area) and for any Unit not yet required to undergo final closure, the ROWD shall contain a preliminary closure and post-closure maintenance plan, under § 21769, containing a generalized cost estimate for closure costs and for annualized post-closure costs, supported by sufficient detail to validate the plausibility of the estimate. For any Unit (or portion thereof, in the case of a landfill undergoing complete final closure of a portion of the Unit) that is closing (or that is required to close), the ROWD shall be amended to contain a final closure plan, under § 21769, containing sufficient detail for the RWQCB to validate that the closed Unit will meet all applicable SWRCB-promulgated closure-related requirements of this title, and containing an updated, itemized closure cost estimate.
Credits
Note: Authority cited: Section 1058, Water Code. Reference: Sections 13172 and 13267, Water Code; and Section 43103, Public Resources Code.
History
1. New section filed 6-18-97; operative 7-18-97 (Register 97, No. 25).
This database is current through 3/15/24 Register 2024, No. 11.
Cal. Admin. Code tit. 27, § 21750, 27 CA ADC § 21750
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