(b) As part of the determination made pursuant to Section 21080.1, a county shall determine whether a project within its jurisdiction may result in a conversion of oak woodlands that will have a significant effect on the environment. If a county determines that there may be a significant effect to oak woodlands, the county shall require one or more of the following oak woodlands mitigation alternatives to mitigate the significant effect of the conversion of oak woodlands:

1. (1) Conserve oak woodlands, through the use of conservation easements.

2. (2)

   1. (A) Plant an appropriate number of trees, including maintaining plantings and replacing dead or diseased trees.
   2. (B) The requirement to maintain trees pursuant to this paragraph terminates seven years after the trees are planted.
   3. (C) Mitigation pursuant to this paragraph shall not fulfill more than one-half of the mitigation requirement for the project.
   4. (D) The requirements imposed pursuant to this paragraph also may be used to restore former oak woodlands.
3. (3) Contribute funds to the Oak Woodlands Conservation Fund, as established under subdivision (a) of Section 1363 of the Fish and Game Code, for the purpose of purchasing oak woodlands conservation easements, as specified under paragraph (1) of subdivision (d) of that section and the guidelines and criteria of the Wildlife Conservation Board. A project applicant that contributes funds under this paragraph shall not receive a grant from the Oak Woodlands Conservation Fund as part of the mitigation for the project.
4. (4) Other mitigation measures developed by the county.

(d) The following are exempt from this section:

1. (1) Projects undertaken pursuant to an approved Natural Community Conservation Plan or approved subarea plan within an approved Natural Community Conservation Plan that includes oaks as a covered species or that conserves oak habitat through natural community conservation preserve designation and implementation and mitigation measures that are consistent with this section.
2. (2) Affordable housing projects for lower income households, as defined pursuant to Section 50079.5 of the Health and Safety Code, that are located within an urbanized area, or within a sphere of influence as defined pursuant to Section 56076 of the Government Code.
3. (3) Conversion of oak woodlands on agricultural land that includes land that is used to produce or process plant and animal products for commercial purposes.
4. (4) Projects undertaken pursuant to Section 21080.5 of the Public Resources Code.

(e)

1. (1) A lead agency that adopts, and a project that incorporates, one or more of the measures specified in this section to mitigate the significant effects to oaks and oak woodlands shall be deemed to be in compliance with this division only as it applies to effects on oaks and oak woodlands.
2. (2) The Legislature does not intend this section to modify requirements of this division, other than with regard to effects on oaks and oak woodlands.