1. (a) If a hydrostatic tightness test is performed on sumps or spill containment, or both, pursuant to Env-Or 406.05(b)(2), the test shall be conducted:

   1. (1) After all seams and fittings have been completed and all piping and conduits have been installed;
   2. (2) At a level that is within one inch of the top of the containment sump or spill containment, or 10 inches above the top of the highest containment sump penetration fitting, whichever is lower;
   3. (3) By recording the liquid level measurements at the beginning and end of the test;
   4. (4) For a minimum of 3 hours for containment sumps and one hour for spill containment; and
   5. (5) With no addition of liquid to the containment sump or spill containment after the start of the test.
2. (b) A passing hydrostatic test, when conducted in accordance with (a), above, shall have no loss of liquid or observed leaks after the complete duration of the test.

Source. (See Revision Note #1 at chapter heading for Env-Or 400) #10393, eff 9-1-13; ss by #12643, eff 10-10-18 (formerly Env-Or 406.22) (See Revision Note #2 at chapter heading for Env-Or 400)