1. (a) The site development plan of the application shall contain the following elements:

   1. (1) the landfill method proposed, e.g., trench, area fill, or combination;
   2. (2) provisions for all-weather operation, e.g., all-weather road, wet-weather pit, alternate disposal site, etc.; provisions for all-weather access from publicly owned routes to the disposal site and from the entrance of the site to unloading areas used during wet weather. Interior access road locations and the type of surfacing shall be indicated on a site plan. The roads within the site shall be designed so as to minimize the tracking of mud onto the public access road;
   3. (3) type and location of fences or other suitable means of access control to prevent the entry of livestock, to protect the public from exposure to potential health and safety hazards, and to discourage unauthorized entry or uncontrolled disposal of solid waste or hazardous materials;
   4. (4) calculation of estimated rate of solid waste deposition and operating life of the site. (As a general rule, 10,000 people with a per capita collection rate of five pounds per day dispose of 10 to 15 acre-feet of solid waste in one year); and
   5. (5) provide required information on drinking water protection in accordance with §§330.200-330.206 of this title (relating to Groundwater Protection Design and Operation).

2. (b) The site development plan of the application shall contain sufficient information to document compliance with the following.

   1. (1) A facility shall not cause:

      1. (A) a discharge of solid wastes or pollutants adjacent to or into the water in the state, including wetlands, that is in violation of the requirements of the Texas Water Code, §26.121;
      2. (B) a discharge of pollutants into waters of the United States, including wetlands, that violates any requirements of the Clean Water Act, including, but not limited to, the National Pollutant Discharge Elimination System (NPDES) requirements, pursuant to §402 as amended;
      3. (C) a discharge of dredged or fill material to waters of the United States, including wetlands, that is in violation of the requirements under the federal Clean Water Act, §404, as amended; and
      4. (D) a discharge of a nonpoint source pollution of waters of the United States, including wetlands, that violates any requirement of an areawide or statewide water quality management plan that has been approved under the federal Clean Water Act, §208 or §319, as amended.
   2. (2) The owner or operator shall design, construct, and maintain a run-on control system capable of preventing flow onto the active portion of the landfill during the peak discharge from at least a 25-year storm.
   3. (3) The owner or operator shall design, construct, and maintain a run-off management system from the active portion of the landfill to collect and control at least the water volume resulting from a 24-hour, 25-year storm. The run-off from the active portion shall be discharged in compliance with paragraph (1) of this subsection or disposed of in an authorized manner.
   4. (4) Dikes, embankments, drainage structures, or diversion channels sized and graded to handle the design run-off shall be provided. The slopes of the sides and toe shall be graded in such a manner so as to minimize the potential for erosion.

   5. (5) Drainage calculations are as follows.

      1. (A) Calculations for areas of 200 acres or less shall follow the rational method and shall utilize appropriate surface run-off coefficients, as specified in the Texas Department of Transportation Bridge Division Hydraulic Manual. Time of run-off concentration as defined within the said manual generally shall not be less than 10 minutes for rainfall intensity determination purposes.
      2. (B) Calculations for discharges from areas greater than 200 acres shall be computed by using USGS/DHT hydraulic equations compiled by the United States Geological Survey and the Texas Department of Transportation and Public Transportation (TxDOT Administrative Circular 80-76), the HEC-1 and HEC-2 computer programs developed through the Hydrologic Engineering Center of the United States Army Corps of Engineers, or an equivalent or better method approved by the executive director.
      3. (C) Designs of all drainage facilities within the site area shall include such features as typical cross-sectional areas, ditch grades, flow rates, water surface elevation, velocities, and flowline elevations along the entire length of the ditch.
      4. (D) Sample calculations shall be provided to verify that natural drainage patterns will not be significantly altered.
      5. (E) The proposed surface water protection and erosion control practices must maintain low non-erodible velocities, minimize soil erosion losses below permissible levels, and provide long-term, low maintenance geotechnical stability to the final cover.
   6. (6) The owner or operator shall handle, store, treat, and dispose of surface or groundwater that has become contaminated by contact with the working face of the landfill or with leachate in accordance with §330.139 of this title (relating to Contaminated Water Discharge). Storage areas for this contaminated water shall be designed with regard to size (verifying calculations included), treatment (supporting documentation and calculations included), locations, and methods and shall have an approved liner covering the bottom and side slopes. Other surface run-off water shall be handled in accordance with paragraph (3) of this subsection.

   7. (7) The site shall be protected from flooding by suitable levees constructed to provide protection from a 100-year frequency flood and in accordance with the rules and regulations of the TWC and successors relating to levee improvement districts and approval of plans for reclamation projects or the rules of the county or city having jurisdiction under the Texas Water Code, §16.236, as implemented by §§301.31-301.46 of this title (relating to Levee Improvement Districts, District Plans of Reclamation, and Levees and Other Improvements).

      1. (A) Flood protection levees shall be designed and constructed to prevent the washout of solid waste from the site.
      2. (B) A freeboard of at least three feet shall be provided except in those cases where a greater freeboard is required by the agency having jurisdiction under the Texas Water Code, §16.236.
      3. (C) Such levees shall not significantly restrict the flow of a 100-year frequency flood nor significantly reduce the temporary water storage capacity of the 100-year floodplain.

   8. (8) The final cover design shall provide effective long-term erosional stability to the top dome surfaces and embankment side slopes in accordance with the following.

      1. (A) Estimated peak velocities for top surfaces and embankment slopes should be less than the permissible non-erodible velocities under similar conditions.
      2. (B) The top surfaces and embankment slopes of municipal solid waste landfill units shall be designed to minimize erosion and soil loss through the use of appropriate side slopes, vegetation, and other structural and non-structural controls, as necessary. Soil erosion loss (tons/acre) for the top surfaces and embankment slopes may be calculated using the Soil Conservation Service of United States Department of Agriculture's Universal Soil Loss Equation, in which case the potential soil loss should not exceed the permissible soil loss for comparable soil-slope lengths and soil cover conditions.
      3. (C) Details for final cover shall be depicted on fill cross-sections and provided along with other information in accordance with §330.56(b) of this title (relating to Attachments to the Site Development Plan).
      4. (D) The final cover design shall be in accordance with the final closure plan.
   9. (9) The site shall be designed to protect endangered species.

   10. (10) Landfill markers shall be installed to clearly mark significant features. The executive director may modify specific marker requirements to accommodate unique site specific conditions.

       1. (A) All markers shall be posts, steel, or wooden and shall extend at least six feet above ground level. Markers shall not be obscured by vegetation. Sufficient intermediate markers shall be installed to show the required boundary. Markers shall be installed at:

          1. (i) site boundary;
          2. (ii) 50-foot buffer zone;
          3. (iii) easements and rights-of-way;
          4. (iv) landfill grid system;
          5. (v) SLER or FMLER area; and
          6. (vi) 100-year flood limits.

       2. (B) All markers shall be color coded as follows:

          1. (i) black--boundary markers;
          2. (ii) yellow--buffer zone markers;
          3. (iii) green--easement and rights-of-way markers;
          4. (vi) white--grid markers;
          5. (v) red--SLER or FMLER markers; and
          6. (vi) blue--flood protection markers.
       3. (C) Site boundary markers shall be placed at each corner of the site and along each boundary line at intervals no greater than 300 feet. Fencing may be placed within these markers as required.
       4. (D) Markers identifying the 50-foot buffer zone shall be placed along each buffer zone boundary at all corners and between corners at intervals of 300 feet. Placement of the landfill grid markers may be made along a buffer zone boundary.
       5. (E) Easement and right-of-way markers shall be placed along the centerline of an easement and along the boundary of a right-of-way at each corner within the site and at the intersection of the site boundary.
       6. (F) A landfill grid system shall be installed at all solid waste facilities unless written approval from the executive director has been received. The grid system shall encompass at least the area expected to be filled within the next three-year period. Although grid markers shall be maintained during the active life of the site, post-closure maintenance of the grid system is recommended but not required. The grid system, similar to a typical city map grid, shall consist of lettered markers along two opposite sides, and numbered markers along the other two sides. Markers shall be spaced no greater than 100 feet apart measured along perpendicular lines. Where markers cannot be seen from opposite boundaries, intermediate markers shall be installed, where feasible.
       7. (G) SLER or FMLER area markers shall be placed so that all areas for which an SLER or FMLER has been submitted and approved by the department are readily determinable. Such markers are to provide site workers immediate knowledge of the extent of approved disposal areas. These markers shall be located so that they are not destroyed during operations until operations extend into the next SLER or FMLER. The location of these markers shall be tied into the landfill grid system and shall be reported on each SLER or FMLER submitted. SLER and FMLER markers shall not be placed inside the evaluated areas.
       8. (H) Flood protection markers shall be installed for any area within a solid waste disposal facility that is subject to flooding prior to the construction of flood protection levee. The area subject to flooding shall be clearly marked by means of permanent posts not more than 300 feet apart or closer if necessary to retain visual continuity.
       9. (I) Specific trenches dedicated to the burial of Class I nonhazardous industrial solid waste shall be designated and operated in accordance with §330.137 of this title (relating to Disposal of Industrial Wastes). The approved composite liner area shall be marked at all corners. Such markers are to provide site workers immediate knowledge of the extent of approved disposal areas. These markers shall be located so that they are not destroyed during operations.
       10. (J) A permanent benchmark shall be established at the site in an area of the site that is readily accessible and will not be used for disposal. This benchmark shall be a bronze survey marker set in concrete and shall have the benchmark elevation and survey date stamped on it. The benchmark elevation shall be surveyed from a known United States Coast and Geodetic Survey benchmark or other reliable benchmark. The location and elevation of the reference benchmark and the permanent benchmark shall be identified on a map and shall be included in the site development plan.

Source Note:The provisions of this §330.55 adopted to be effective October 9, 1993, 18 TexReg 4023.