Tesoro Del Valle will support denser development in the future while Agua Dulce keeps its rural highways.

Those were among the changes ordered by Los Angeles County supervisors as they signaled their intent to approve the “One Valley, One Vision” Santa Clarita Valley Area Plan on Tuesday.

OVOV is the document that would put the city of Santa Clarita and the county of Los Angeles on the same page when it comes to planning future development in the SCV.

The Santa Clarita City Council already approved its version of the plan. On Tuesday the Board of Supervisors certified the environmental report for the county version. The last step will be the final adoption in a couple of months, after county staffers make the changes ordered Tuesday.

Planners Mitch Glaser of the county and Jason Smisko of the city have spearheaded the multi-year effort for their respective agencies.

Supervisor Don Knabe abstained from Tuesday’s 4-0 vote.

Glaser said Knabe was concerned that OVOV’s proposed expansion of the SCV’s significant ecological areas hadn’t been run throguh the county’s Significant Ecological Area Technical Advisory Committee, or SEATAC.

Glaser said the approval motion from Supervisor Michael D. Antonovich, who represents the SCV, instructed the county staff to report back in 30 days on the SEA issue.

Small but significant changes were made to the OVOV blueprint for certain communities.

Supervisors upgraded the future Phase II development area in Tesoro del Valle to an “urban” status to match the Tesoro developer’s plans for about 1,000 homes north of the existing community.

The area was initially to have an urban designation under OVOV, but the Los Angeles County Regional Planning Commission redesignated it rural. The request to change it back to urban came from the Tesoro Homeowners Association, whose board is controlled by Tesoro’s developer, Montalvo Properties.

At the request of the Agua Dulce Town Council, supervisors agreed to leave Davenport and Agua Dulce Canyon roads as 2-lane highways (one lane in each direction) instead of upgrading them to 4-lane highways, which they’d have been under OVOV.

Finally, at the request of the Castaic Area Town Council, supervisors increased the density of future development in Charlie Canyon east of Interstate 5 so future developer fees would be sufficient to build a secondary ingress-egress road connecting Castaic and Tesoro del Valle. Glaser noted that Castaic could have used such a road on Monday when Interstate 5 was closed at Hasley Canyon due to weather conditions.

The new designation increases the density in Charlie Canyon from one house per 10 acres to one house per two or  five acres depending on the specific location.