Based on analysis of FCC license data:
Site 2 is a simulcast cell consisting of Red Mountain and Rincon Peak. This would provide coverage to the area between Ventura, Carpinteria, and Ojai.
Site 3 is a simulcast cell consisting of South Mountain, Laguna Peak, Hall Canyon, and NAS Point Mugu. This would provide coverage to the Ventura/Oxnard/Camarillo area.
Site 4 is a simulcast cell consisting of Castro Peak, Santa Susana, Torrey Mountain, South Mountain, Mt McCoy, Twilight Canyon, and Rasnow. This would provide coverage to the Simi Valley/Moorpark/Thousand Oaks area.
Site 5 is a standalone site at Sisar Peak.
There should also be another simulcast cell (Site 1?) consisting of Frazier Mountain, Lockwood Sheriff Substation, and Cerro Noroeste (however, Cerro Noroeste is only licensed for 3 of the 6 frequencies licensed at the other two locations).