(a) “Unified Program Facility” means all contiguous land and structures, other appurtenances, and improvements on the land which are subject to the requirements of paragraph (1) of subdivision (

c) of

Section 25404. (b) “Certified Unified Program Agency” or “CUPA” means the agency certified by the secretary to implement the unified program specified in

Chapter 6.11 (commencing with

Section 25404) within a jurisdiction. (c) “Participating Agency” or “PA” means an agency which has a written agreement with the CUPA pursuant to subdivision (

d) of

Section 25404.3, and is approved by the secretary, to implement or enforce one or more of the unified program elements specified in paragraph (1) of subdivision (

c) of

Section 25404, in accordance with the provisions of Sections 25404.1 and 25404.2. (d) “Unified Program Agency” or “UPA” means the CUPA, or its participating agencies to the extent each PA has been designated by the CUPA, pursuant to a written agreement, to implement or enforce a particular unified program element specified in paragraph (1) of subdivision (

c) of

Section 25404. For purposes of this chapter, the UPAs have the responsibility and authority, to the extent provided by this

chapter and Sections 25404.1 and 25404.2, to implement and enforce only those requirements of this

chapter listed in paragraph (1) of subdivision (

c) of

Section 25404. The UPAs also have the responsibility and authority, to the extent provided by this

chapter and Sections 25404.1 and 25404.2, to implement and enforce the regulations adopted to implement the requirements of this

chapter listed in paragraph (1) of subdivision (

c) of

Section 25404. After a CUPA has been certified by the secretary, the unified program agencies shall be the only local agencies authorized to enforce the requirements of this

chapter listed in paragraph (1) of subdivision (

c) of

Section within the jurisdiction of the CUPA. This

section shall not be construed to limit the authority or responsibility granted to the department by this

chapter to implement and enforce this

chapter and the regulations adopted pursuant thereto.