R311-204-5. Remediation

  (a) Any UST release management, abatement, investigation, corrective action or evaluation activities performed for a fee, or in connection with services for which a fee is charged, must be performed under the supervision of a Certified UST Consultant, except as outlined in sections 19-6-402(6)(b)(i), 19-6-402(6)(b)(ii), and R311-204-5(b).

  (b) At the time of UST closure, a certified UST Remover may overexcavate and properly dispose of up to 50 cubic yards of contaminated soil per facility, or another volume approved by the Director, in addition to the minimum amount required for closure of the UST. This overexcavation may be performed without the supervision of a certified UST Consultant. Appropriate confirmation samples must be taken by a certified groundwater and soil sampler in accordance with R311-201 for the purpose of determining the extent and degree of contamination.