CA Health & Safety Code Section 25395.90

(a)

Except as otherwise expressly provided in this article, the definitions in Article 2 (commencing with Section 25395.63) apply to the terms used in this article.

(b)

“Action level” has the same meaning as defined in paragraph (1) of subdivision (c) of Section 116455.

(c)

“Host jurisdiction” means the city or county in which the site is located and which has the authority to take action regarding the site pursuant to Title 7 (commencing with Section 65000) of the Government Code.

(d)

“Unreasonable risk” at a site means that a condition at a site requires a response action pursuant to Chapter 6.8 (commencing with Section 25300) of this code or Division 7 (commencing with Section 13000) of the Water Code.