(a) The permittee must place lines with emitters between six and 48 inches below the surface of the soil.     
      (b) The permittee shall divide the subsurface area drip dispersal system into a sufficient number of different dispersal zones (at least two dispersal zones) so that the system can operate with the greater of either one dispersal zone or 10% of the total number of dispersal zones out of service.     
      (c) The permittee shall design the dispersal zones so that the dispersal lines follow the contour of the site and shall not exceed 1% lateral slope.     
      (d) The permittee shall include the dispersal zone design in the engineering report, including the following elements:      
        (1) the proposed line layout with:                  (A) main line sizes and lengths; and                   (B) individual dispersal line lengths;         
        (2) flushing flows;       
        (3) static head calculations;       
        (4) the total proposed flow in gallons per day;       
        (5) total length of emitter piping;       
        (6) emitter spacing;       
        (7) line spacing;       
        (8) total number of lines; and       
        (9) total number of lines to be included per flushing.       
      (e) The permittee shall ensure that emitter and tubing spacing is on not less than one foot centers and on not greater than three feet centers, unless an exception is approved by the executive director.     
      (f) The permittee shall disinfect the drip lines and emitters according to the degree and frequency determined by the design engineer and submitted in the engineering report along with the justification for the degree and frequency of disinfection.     
      (g) The permittee shall equip the subsurface area drip dispersal system with audible and visual alarms that will activate in case of a problem with the system.      
        (1) If the subsurface area drip dispersal system is not staffed on a daily basis, the permittee shall equip the system with a telemetry device that notifies the operator in case of a system malfunction.       
        (2) The telemetry system must include the following components:                  (A) remote access;                   (B) audio/visual alarms for:                      (i) flow or pressure variances; or                       (ii) system failure;                     (C) automated filter;                   (D) zone flushing; and                   (E) integrated external monitoring devices if required, such as soil moisture monitors.         
     Source Note:        The provisions of this §222.121 adopted to be effective July 5, 2006, 31 TexReg 5308