The Ventura County Board of Supervisors unanimously approved a contract on Tuesday with an Agoura Hills-based firm to complete an environmental impact report on a proposed development in the Santa Rosa Valley.

Board members approved the $142,620 contract with Envicom Corp., which will complete the report on the development proposed by Wildwood Stable Estates LP.

The development is on a 133.2-acre lot at 10490 Santa Rosa Road. It is on unincorporated land near Moorpark and is bordered on the south side by the Mountclef Ridgeline in Thousand Oaks. Wildwood Regional Park in Thousand Oaks is south of the project site.

The property will be subdivided into 18 residential lots that would range from 2 to 40 acres.

Access to the proposed site would be provided via a new private road near the intersection of Blanchard and Santa Rosa roads.

A bridge is being proposed across the Arroyo Santa Rosa Creek to access some of the lots. Construction of about 1.05 acres of equestrian trails adjacent to Santa Rosa Road and along portions of Arroyo Santa Rosa Creek is also being proposed.

Representatives from Wildwood Stable Estates said a limited number of horses may be allowed on some of the properties depending on the findings of a nitrate study on the land.

A preliminary environmental analysis by the county Planning Department revealed the project had the potential to create significant environmental effects on air and groundwater quality, as well as endangered species and wildlife migration corridors.

Seventeen native trees would also be removed.

The project site historically has been used for agricultural purposes but has been unused for seven years. A portion of the property, which has been zoned for rural use, will need to be changed if the project is approved.

Wildwood Stable Estates has proposed widening a stream channel and implementing a riparian mitigation and restoration plan, which would preclude future development in certain areas.

County planners said that since the project has the potential to create an adverse significant effect on wetland habitat, it could be inconsistent with the Ventura County general plan.