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III. Environmental Setting, Impacts,and Mitigations F. Vegetation and Wildlife regarding natural resource conservation and protection. These trees are also important for foraging and as roosting,perching,and nesting substrate for local bird species,including the Swainson's hawk, discussed below. Mitigation Measure F.2. Identified by this EIR (a) Prior to final project approval,the project proponent should employ a qualified arborist to document all on-site valley oaks as to precise location,diameter at breast height(24 inches above normal grade),height,canopy radius,and condition. This information should supply the comparative baseline data to be used for any necessary tree replacement as well as during subsequent monitoring. (b) Prior to final project approval,the project proponent should modify proposed project components to avoid all identified on-site valley oaks (see Figure III.F.1). Project-related ground disturbance should not occur within the dripline of any on-site valley oak. As the majority of these trees occur on the site boundaries,avoidance of these resources is likely possible. For example,the project does not propose disturbance in the vicinity of Drainage A,thereby eliminating impacts to fourteen valley oaks. Through modification of project boundaries on the south and east boundaries of the Brocchini property and the south and west boundaries of the CYA property,impacts to twelve valley oaks would be eliminated. Similarly,avoidance of the stand of five mature valley oaks adjacent to.the west of Little Johns Creek on the northern boundary of the Brocchini property would be achieved through relocation of the proposed floodplain containment dike to the west by approximately 50 feet,thereby placing this oak stand adjacent to other proposed retained open space. Impacts to the valley oak located adjacent to the north of Little Johns Creek on the north-central boundary of the Brocchini property would be avoided through relocation of the north-central boundary of Phase IV approximately 50 feet to the south in the vicinity of this tree,thereby also placing this tree adjacent to other proposed retained open space. Implementation of these measures would eliminate impacts to all thirty-two on-site valley oaks. (c) Prior to initiation of any activity within a 100-foot radius of a valley oak proposed for retention,the project proponent should install clearly visible temporary fencing around the dripline of the valley oak to prevent inadvertant damage during on-site activities. Fencing should be removed upon completion of activity within the oak's vicinity. Site workers should be advised of the sensitivity of on-site oaks to disturbance. (d) Where avoidance of a valley oak(s) as specified above is determined infeasible,the project proponent should replace each oak as required by the City of Stockton's Heritage Tree Ordinance: oaks up to 100 inches in circumference should be replaced with one 36 inch box oak tree or two 24 inch box oak trees;oaks greater than 100 inches in circumference should be replaced with one 48 inch box oak tree or four 24 inch box oak trees. Replacement trees should be planted on the site in association with the CRRP described under Mitigation Measure F.1(b). III.F.25