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The area addressed as Phase II in the 2015 adopted plan will be evaluated as a portion of Phase II.a for the
current investigation. In addition, the project study area was expanded to include approximately 9 square miles
between the Phase II area and Henry Mayo Drive (State Route 126), generally known as Stevenson Ranch; as
well as approximately 2 square miles, generally known as Woolsey Canyon/Dayton Canyon/Bell Canyon. The
southern expansion area will be evaluated as Phase II.b.

The proposed project, including Phase II.a and Phase II.b, represents approximately 24 square miles
(approximately 14,408 acres). The project study area appears on the U.S. Geological Survey (USGS) 7.5-
minute series Val Verde, Newhall, Simi Valley East (Santa Susana), Oat Mountain, and Calabasas topographic
quadrangles (Figure 1.4-3, Topographic Map with USGS 7.5-Minute Quadrangle Index).

Phase II.a

The Phase II.a area is an approximately 22-square-mile area located in the north-facing slopes of the Santa
Susana Mountains and the Santa Clarita Valley. Phase II.a is composed of generally mountainous and valley
terrain that abuts Henry Mayo Drive (State Route [SR] 126) to the north, the Interstate-5 freeway to the east,
Phase I of the SSMFTMP area to the south, and the Newhall Ranch Specific Plan area to the west (see Figure
1.4-2). The Phase II.a area, which is located in the County of Los Angeles Fifth Supervisorial District, includes
a portion (Phase II) of the SSMFTMP Area. The community of Stevenson Ranch and Six Flags Magic
Mountain are located within the Phase II.a area. The elevation of the Phase II.b area ranges from 946 feet
above mean sea level (MSL) within the Santa Clara River near SR-126, to 3,430 feet above MSL in the
southwestern corner of the Phase II.a area. Sand Rock Peak (2,511 feet above MSL) is located within the
northwestern portion of the Phase II.a area.

Phase II.b

The Phase II.b area is an approximately 2-square-mile area located in the foothills of the Santa Monica
Mountains, including Bell Canyon, Dayton Canyon, and Woolsey Canyon, west of San Fernando Valley. The
Phase II.b area, which is also located in the County of Los Angeles Fifth Supervisorial District, is composed of
generally mountainous and valley terrain that abuts Ventura County to the north and west and the City of Los
Angeles to the east and south (see Figure 1.4-2). The elevation of the Phase II.b area ranges from 896 feet
above MSL at the northeastern corner of the Phase II.b area near Chatsworth Reservoir, to 1,877 feet above
MSL near the northwestern corner of the Phase II.b area. There are no named peaks within the Phase II.b
area.

1.5 PROJECT SPONSOR

County of Los Angeles Department of Parks and Recreation
510 South Vermont Avenue
Los Angeles, California 90020

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