27 CA ADC § 20360


      27 CCR s 20360

      Cal. Admin. Code tit. 27, s 20360


      CALIFORNIA CODE OF REGULATIONS
      TITLE 27. ENVIRONMENTAL PROTECTION
      DIVISION 2. SOLID WASTE
      SUBDIVISION 1. CONSOLIDATED REGULATIONS FOR TREATMENT, STORAGE, PROCESSING
      OR DISPOSAL OF SOLID WASTE
      CHAPTER 3. CRITERIA FOR ALL WASTE MANAGEMENT UNITS, FACILITIES, AND 
      DISPOSAL
      SITES
      SUBCHAPTER 2. SITING AND DESIGN
      ARTICLE 4. SWRCB - WASTE MANAGEMENT UNIT CONSTRUCTION STANDARDS
      This database is current through 04/21/06, Register 2006, No. 16. 

      s 20360. SWRCB - Subsurface Barriers. (C15: s2545)

      (a) Subsurface barriers are cutoff walls or grout curtains which are used 
      in conjunction with natural geologic materials to assure that lateral 
      hydraulic conductivity standards specified in Article 3 of this subchapter 
      are satisfied. Paragraphs (b) and (c) specify conditions under which 
      cutoff walls and grout curtains, respectively, are used.

      (b) Cutoff walls.

      (1) Cutoff walls are required at Class II Units where there is potential 
      for lateral movement of fluid, including waste or leachate, and the 
      hydraulic conductivity of natural geologic materials is used for waste 
      containment in lieu of a liner. Cutoff walls shall be installed at Class 
      III landfills as required by the RWQCB.

      (2) Cutoff walls shall be:

      (A) a minimum of two feet thick for clay materials; or

      (B) a minimum of 40 mils (i.e., 0.040 ") thick for synthetic materials; 
and

      (C) regardless of the option under ¶(b)(2)(A or B), shall be keyed a 
      minimum of five feet into natural geologic material which satisfies the 
      applicable hydraulic conductivity requirements in Article 3 of this 
      subchapter.

      (3) If cutoff walls are used, excavations for Units shall be keyed into 
      natural geologic materials which satisfy applicable hydraulic conductivity 
      requirements in Article 3 of this Subchapter.

      (4) At closure of a waste pile or surface impoundment, all contaminated 
      natural geologic materials present between the cutoff wall(s) and the 
      waste shall be removed and disposed of at an authorized location, or the 
      Unit shall be closed as a landfill.

      (5) Cutoff walls shall have fluid collection systems installed upgradient 
      of the structure. The systems shall be designed, constructed, operated, 
      and maintained to prevent the buildup of hydraulic head against the 
      structure. The collection system shall be inspected regularly, and 
      accumulated fluid shall be removed.

      (c) Grout Curtains.

      (1) Grout curtains may be used as needed to prevent lateral waste movement 
      through fractures in natural geologic materials that otherwise satisfy 
      applicable hydraulic conductivity requirements in Article 3 of this 
      Subchapter. Only fractures that are at or near the surface and are of 
      limited vertical extent may be grouted.

      (2) The acceptability of grout curtains for a Unit shall include 
      consideration of:

      (A) depth and nature of fracturing; and

      (B) fracture orientation.

      (3) Grout characteristics shall not be adversely affected by fluid, 
      including waste and leachate, or natural conditions.

      (4) Optimum grouting pressure and the placement of grout holes shall be 
      determined by test grouting.


      


      Note: Authority cited: Section 1058, Water Code. Reference: Sections 13172 
      and 13360, Water Code; and Section 43103, Public Resources Code. 


       HISTORY 
         
      1. New section filed 6-18-97; operative 7-18-97 (Register 97, No. 25).
      27 CA ADC s 20360

      END OF DOCUMENT

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