Section 2595 - Waste Management Unit Characteristics(a) Dischargers shall provide in the report of waste discharge an analysis describing how the ground and surface water may affect the waste management unit and how the unit may affect ground and surface water. This information is used to determine the suitability of the unit with respect to ground water protection and avoidance of geologic hazards. It will also be used to demonstrate that the unit meets the classification criteria set forth in Article 3 of this chapter.(b) Dischargers shall provide the following data on the physical characteristics of the waste management unit and the surrounding region in order to demonstrate suitability for the Class I classification. Information shall be presented in understandable written, tabular, and graphic format as appropriate, and shall be at a level of detail appropriate for the Class I Unit classification. 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) 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.(d) Topography (1) A map of the waste management unit and its surrounding region within one mile of the unit, showing elevation contours, natural ground slopes, drainage patterns, and other topographic features.(2) 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 Administration (FEMA) flood map, if used, or the calculations and maps used where an FEMA map is not available. Information shall also be provided identifying the 100-year flood plain 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. Owners and operators of facilities located in the 100-year floodplain shall provide the following information:(A) Engineering analysis to indicate the various hydrodynamic and hydrostatic forces expected to result at the site as consequence of a 100-year flood.(B) Structural or other engineering studies showing the design of waste management units and flood protection devices (e.g., floodwalls, dikes) at the facility and how these will prevent washout.(e) Climatology--Dischargers shall calculate required climatologic values for Class I waste management 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. (1) A map showing isohyetal contours for the proposed waste management unit and its surrounding region within ten miles, based on data provided by the National Weather Service or other recognized federal, state, local, or private agencies.(2) Estimated maximum and minimum annual precipitation at the proposed waste management unit.(3) Maximum expected 24-hour precipitation for storm conditions specified as design criteria for Class I waste management units, as prescribed in Table 4.1 of Article 4 of this chapter.(4) Estimated mean, minimum, and maximum evaporation, with the months of occurrence of maximum and minimum evaporation, for the proposed waste management unit.(5) Projected volume and pattern of runoff for the proposed waste management unit including peak stream discharges associated with the storm conditions specified as design criteria for a Class I Unit, as prescribed in Table 4.1 of Article 4 of this chapter.(6) An estimated wind rose for the proposed waste management unit showing wind direction, velocity, and percentage of time for the indicated direction.(f) Geology (1) A geologic map and geologic cross-sections of the waste management unit showing lithology and structural features. Cross-sections shall be indexed to the geologic map and shall be located to best portray geologic features relevant to discharge operations.(2) A description of natural geologic materials in the waste management unit and its surroundings, including identification of rock types, nature of alteration depth and nature of weathering, and all other pertinent lithologic data.(3) A description of the geologic structure of the waste management unit, 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, attitude, and nature (tight, gouge-filled, etc.) of any faults; and all other pertinent structural data.(4) The results of a testing program for determination of physical and chemical properties of soils needed to formulate detailed site design criteria.(5) A determination of the expected peak ground acceleration at the waste management unit associated with the maximum credible earthquake. The methodology used 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 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. The analysis shall include: (A) the method use to calculate the factors of safety (e.g., Bishop's modified method of slices, Fellinius circle method, etc.);(B) the name of any computer program used to determine the factors of safety; and(C) a description of the various assumptions used in the stability analyses (height of fill, slope-and-bench configuration, etc.).(6) Dischargers who own or operate new Class I waste management units and expansions of existing units shall demonstrate that no faults which have had displacement in Holocene time pass within 200 feet of units. This demonstration may be made using either published geologic data or data obtained from field investigations carried out by the applicant. The information provided shall be acceptable to geologists experienced in identifying and evaluating seismic activity. The information submitted shall show that either: (A) no faults which have had displacement in Holocene time are present, or no lineations which suggest the presence of a fault (which have displacement in Holocene time) within 3,000 feet of a facility are present, based on data from:1. published geologic studies,2. aerial reconnaissance of the area within a 5-mile radius from the facility,3. an analysis of aerial photographs covering a 3,000-foot radius of the facility, and4. if needed to clarify the above data, a reconnaissance based on walking portions of the area within 3,000 feet of the facility, or(B) if faults (to include lineations) which have had displacement in Holocene time are present within 3,000 feet of a facility, no faults pass within 200 feet of the portions of the facility where treatment, storage, or disposal of hazardous waste will be conducted, based on data from a comprehensive geologic analysis of the site. Unless a site analysis is otherwise conclusive concerning the absence of faults within 200 feet of such portions of the facility data shall be obtained from a subsurface exploration (trenching) of the area within a distance no less than 200 feet from portions of the facility where treatment, storage, or disposal of hazardous waste will be conducted. Such trenching shall be performed in a direction that is perpendicular to known faults (which have had displacement in Holocene time) passing within 3,000 feet of the portions of the facility where treatment, storage, or disposal of hazardous waste will be conducted. Such investigation shall document with supporting maps and other analyses, the location of faults found.(g) Hydrology (1) An evaluation of the water-bearing characteristics of the natural geologic materials identified under subsection (f)(2) of this section including determination of permeability, delineation of all ground water zones and basic data used to determine the above.(2) An evaluation of the in place permeability of soils immediately underlying waste management unit. This evaluation shall include: (A) permeability data, in tabular form, for selected locations within the unit;(B) a map of the unit showing test locations where these permeability data were obtained; and(C) an evaluation of the test procedures and rationale used to obtain these permeability data.(3) An evaluation of the perennial direction(s) of ground water movement within the uppermost ground water zone(s) within one mile of the waste management facility perimeter.(4) 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.(5) A map showing the location of all springs in the waste management facility and within one mile of its perimeter. The map shall be accompanied by tabular data indicating the flow and the mineral quality of the water from each spring.(6) 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 perimeter including all data necessary to establish water quality protection standards.(7) A tabulation of background water quality for all applicable indicator parameters and waste constituents. (A) Background water quality for an indicator parameter or a waste constituent in ground water shall be based on data from quarterly sampling of wells upgradient from the waste management unit for one year. These analyses shall:1. account for measurement errors in sampling and analysis; and2. account for seasonal fluctuations in background water quality, if such fluctuations are expected to affect the concentration of the hazardous constituent.(B) In an evaluation monitoring program, background water quality may be based on appropriate water quality data that are available before waste discharge requirements are issued in lieu of a one-year monitoring program.(C) Background water quality of ground water may be based on sampling of wells that are not upgradient from the waste management unit where: 1. hydrogeologic conditions do not allow the determination of the upgradient direction; or2. sampling at other wells will provide a representative indication of background water quality.(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. Should there be only one background well, the four measurements per quarter shall be obtained by splitting the sample from the one well into four aliquots and conducting separate analyses for each aliquot.(h) Land and water use (1) A map showing the locations of all water wells, oil wells, and geothermal wells in the waste management unit or within one mile of its perimeter.(2) Name and address of the owner of each well indicated in subsection (h) of this section.(3) Well information, where available, for each water well indicated in subsection (h)(1) of this section including, but not limited to:(B) diameter of casing at ground surface and at total depth;(C) type of well construction (cable-tool, rotary, etc.);(D) depth and type of perforations;(E) name and address of well driller;(F) year of well construction;(G) use of well (agricultural, domestic, stock watering, etc.);(H) depth and type of seals;(I) lithologic, geophysical, and other types of well logs, if available; and(J) water levels, pump tests, water quality, and other well data, if available.(4) Current land use within one mile of the perimeter of the waste management unit, including: (A) types of land use (e.g., residential, commercial, industrial, agricultural, recreational, etc.);(C) types of livestock; and(D) number and location of dwelling units.(5) Current and estimated future use of ground water within one mile of the perimeter of the waste management unit.Cal. Code Regs. Tit. 23, § 2595
1. Amendment of subsections (a), (b), (d)(2), (e), (e)(3), (e)(5), (f)(5) and (f)(6)(A)4., repealer of subsection (f)(7), and amendment of subsection (g)(7)(B) filed 6-18-97; operative 7-18-97 (Register 97, No. 25). Note: Authority cited: Section 1058, Water Code. Reference: Sections 13172, 13260 and 13267, Water Code.
1. Amendment of subsections (a), (b), (d)(2), (e), (e)(3), (e)(5), (f)(5) and (f)(6)(A)4., repealer of subsection (f)(7), and amendment of subsection (g)(7)(B) filed 6-18-97; operative 7-18-97 (Register 97, No. 25).