Fall Zone – TRTP Project

Segment 8A Corridor September 19, 2011

Fall Zone

2

Earthquake-Induced Landslides. The topography along Segment 8A in the Puente and Chino Hills is locally steep and is likely to experience landsliding or slope failures due to earthquakes. Historic earthquake induced ground and slope failures are known to have occurred in the mountains and hills of southern California. Moderate to steep slopes throughout the Puente and Chino Hills could experience slope failures in areas with over-steepened slopes or with bedding planes oriented in the downslope direction.

3.7 GEOLOGY, SOILS, AND PALEONTOLOGYTehachapi Renewable Transmission ProjectPage 3.7-37

http://www.chinohills.org/archives/48/PR09-132%20CPUC%20Releases%20Final%20EIR%20and%20ALJ%20Releases%20Proposed%20Decision%20for%20TRTP.pdf

Fall Zone

3

Due to the nature and characteristic of the steel poles if it were to fall, the fall zone will likely be within the diameter of the height of the pole. Contrast to a lattice tower, if a lattice tower were to fall it would collapse within itself as oppose to falling within it’s radius. The brief presentation describes the fall zone of the TRTP project within a populated area.

Collapse of lattice tower tend to fall within a narrow range.

Note how poles fall within their diameter of the height of the pole.

4

Fall Radius Between Lobelia and Pipeline

Pole ID PMT 195

Pole ID R3221

Pole ID PMT195• There are 6 homes within the pole fall zone• There are 18 homes within the cable fall zone• Closest property within 71 feet of the pole

5

Pole ID PMT195• There are 9 homes within the pole fall zone• There are 28 homes within the cable fall zone• Closest property within 69 feet of the pole

6Note: Size of the pole

7

Fall Radius Between Peyton and Cork

Pole ID 195RA

Pole ID 195RA• There are 9 homes within the pole fall zone• There are 25 homes within the cable fall zone• Closest property within 71 feet of the pole

8Note: Graffiti on the pole

Note: Dimensions of the screws

9

Fall Radius Between Morningfield Dr and Peyton Dr

Pole ID TBD

Pole ID PMT190

Lattice tower ID (TBD), adjacent to Peyton• There is 1 home within the pole fall zone• There are 21 homes within the cable fall zone• Closest property within 180 feet of the pole• Chino Valley Community Church within 100 feet of 500KV line• Loving Savior Lutheran School and Church within 500 feet of a 500KV line• Due to the topography this lattice tower will be nearly 300 feet tall when viewed from Peyton• Ayala HS within 1,450 feet and Little Elementary within 1,100 feet of a 500 KV line• LDS Church within 1,000 feet and Catholic Church 3,050 feet of 500KV line• City Hall within 3,500 feet 500 KV line

10

Chino Valley Community church located on the left.

Ayala High

City Hall

Pole ID PMT190• There are 10 homes within the pole fall zone• There are 34 homes within the cable fall zone• Closest property within 71 feet of the pole

11Note: Size of the pole and proximity to the property

Tower original right of way design for, 100 foot towers

40 foot pole

Zoom

12

Fall Radius Between Crossroads Park and Maplewood Dr

Pole ID PTM195

Pole ID PTM185

Pole ID PMT195• There are 5 home within the pole fall zone• There are 21 homes within the cable fall zone• Closest property within 72 feet of the pole

13Due to the topography this pole viewed from Chino Hills Parkway will have a height of 250 feet.

View facing east, note the lattice tower on the right that the right of way was meant for

Lattice tower

Pole ID PMT185• Crossroads park is within the pole fall zone• Height of pole as viewed from Chino Hills Parkway and Carbon

Canyon is in excess of 275 feet

14Compare to the original tower View from Crossroad Parks

Original Lattice tower

15

Fall Radius Coral Ridge Park and Crossroads Park

Pole ID PTM195

Pole West of Crossroad Park

Pole ID PMT190 through Pole west of Crossroad Park• There are 19 homes within the pole fall zone• There are 51 homes within the cable fall zone• Closest home within 71 feet of the pole• Height of pole as viewed from Chino Hills Parkway 300 feet due to topography

16Note the children and adult by the poleCompare new pole to the original towers

Original Lattice tower

17

Fall Radius at Coral Ridge Park

Corral Ridge Pole

Corral Ridge Pole• Pole within Corral Ridge Park• There are 51 homes within the cable fall zone

18Kids at play at Corral Ridge Park

SUMMARY

• Total Houses Within Fall Zone = 110• Total Houses Within Cable Fall Zone = 198

• Number of Directly Impacted Homes = 308• Average Home Distance From Poles = 71 FT

19