SCIGN Site Evaluation Report
Report status
complete
in progress
blank
Site Name
Site Code
Modjeska Peak
MJPK
Organization USFS, Cleveland National Forest
ECI Completion
Date
Permit StatusWaiting
SCIGN Board Acceptance
EvaluatorsKDC,CPW,TKG Revision #
Yes
No
Date
Reason for Revision
Revisions are underlined
ECI Site Evaluation Summary
ECI Evaluation excellent
Recommended
Percussion
Drill Rig
accept
ECI Recommendation
Sky view excellent
Estimated Remediation/Additional none
Cost
Basis for Rejectionnone
or Further Assessment
Recommend Moving Site
Recommended Site Relocation Distance
no
none
Comments
Sky view is excellent. Security is poor because site is in a remote and unsecured area. ECI recommends installing a 6-foot tall
fence around the site. Site must be drilled with a percussion drill. There is no water onsite for drilling purposes.
This site reconnaissance was conducted in the afternoon, in December, when the sun was setting. As a result, the photographs
are very dark. Where available, we have replaced our photos with photos from John Galetzka’s files.
Site Location
Street Address
Modjeska Peak (west of Glen Ivy Hot Springs, near summit of Modjeska Peak)
City
Unincorporated area, near the Orange County - Riverside County line
Zip Code
91719
Latitude
33.715
Thomas
Brothers Map
388 J10 (small scale) Delorme=104 C3
Primary Contact Information
Name
County
Longitude -117.553
Address 1147 East Sixth Street
Phone #
909.736.1811
Fax
e-mail
Reception
7.5' QuadrangleSantiago Peak
Secondary Contact Information
Title
Corona
UTM East
(not to be web posted w/o consent of individual)
Trabuco Ranger District
City
UTM North
Orange
Zip 91720
Site Geology and Physical Attributes
Present
land use
Unused and unmaintained road on the west flank of Modjeska Peak at the end of a ridge-top dirt road in a remote area
of the Cleveland National Forest.
Earth Materials
Age
Type
volcanic
Cretaceous
Earth Materials
Comments
Artificial Fill
none
yes
Lithology
andesite
maybe
Volcanic rock is moderately to highly fractured in nearby outcrops. Rock is predominately fresh to slightly weathered
at the surface and hard. Ground water should not be encountered in the borings.
Oil wells w/in 2km
yes
Subsidence
none
yes
maybe
Precultural
surface water
none
yes
maybe
Local Physical
Attributes
Additional
geologic
information
MJPK
no
Water wells w/in 2km
Declination 13
yes
no
Landslides
none
yes
Ground slope level
Local drainage
good
fair
poor
Proposed GPS site is located on the west flank of Modjeska Peak at the end of a ridge-top dirt road. The
slopes of the narrow ridge drop off on the north and south sides of the road, 25 to 30 feet from the antenna, a
an angle of approximately 30 to 45 degrees. The road (and GPS site) slopes toward the east at
approximately 2 degrees. In the immediate GPS site area, landslides were not observed during the field
reconnaissance, nor in the aerial photographs reviewed. Several slopes are covered with loose rock (referre
to as skree), but this is not anticipated to affect the stability of the site.
Site is located ~10 km (6 mi) SW from the active trace of the Elsinore fault. The last major earthquake on this
fault occurred on May 15, 1910 with an estimated magnitude of 6.0. No surface rupture from this earthquake
was documented. However, paleoseismic and geomorphic studies have shown repeated Holocene surface
rupture events with 1.5-3 meters of slip per event. Geologic and geodetic studies suggest that the nearby
segments of the Elsinore fault accrue about 5 mm/yr of strain. The Santa Ana Mountains are locally comprise
of the Bedford Canyon Formation and Santiago Peak Volcanics overlying the Peninsular Ranges batholith.
The Santa Ana Mountains form an uplifted and west-tilted fault block.
Sky View and Potential for Interference of Signal
Sky view
excellent
Trees
many bushes
Fences
none
yes
Overhead wires
none
yes
Site Horizon
North
Objects >15 deg
none
Squares above
15 deg
none
Objects above
45 deg
none
Objects above antenna
within 3m
bushes to west
Site Horizon
South
Objects >15 deg
none
Squares above
15 deg
none
Objects above
45 deg
none
Sky view comments
MJPK
Bushes south of the site (within 30 feet) are up to 8 feet high. Minor trimming of the bushes would
improve sky view. Modjeska Peak and Santiago Peak, located 1/4 to the northeast, and 1 mile to
the east of the site, respectively, mask up to 10 degrees of sky view above the proposed site.
The sky view to the west has no obstructions.
Objects above
antenna within 3m
bushes to west
Access
Directions and map to site
Hours24 hours
Thomas Brothers Map
388 J10 (small scale)
MJPK
MJPK is located approximately 43 miles from Orange, California. 1) From the CA-55 and CA-91 intersection, take the
CA-91 (Riverside Freeway) east for 23 miles and exit onto I-15. 2) Proceed south on I-15 for 9 miles and exit on Temesc
Canyon Road/Weirick Road, 3) Proceed south on western frontage road (on the west side of I-15) for 0.5
miles and then make a RIGHTon Bedford Canyon road (only paved for 0.7 miles) and proceed west for 8 miles up
steep winding mountain road on the south side of Bedford Canyon Wash. 4) At 8 miles from the Frontage Road, Bedford
Canyon Road T’s into Main Divide Road. 5) Turn LEFT onto Main Divide Road and proceed south on this winding,
but gently sloped road for 2 miles to Modjeska Peak area. In the Modjeska Peak area several roads depart from the main
road to access radio towers. Stay on main road and go past most of these minor roads. Go past the “Live Wire” sign
numbered 5472511 and proceed to the signpost labeled, “3504 MP18”. 6) Take the first LEFT that “y’’s off the
main road (note the red survey flagging) and proceed 800 ft to the site (see Site Plan).
Site Attributes
Power source
Security
Communication sourcefreewave
Outside Line
Telephone Carrier
Expected
Future Changes none expected
poor
Permanence yes
Summary of Reconnaissance
solar
unknown
Radio Capability no
MJPK
no
No utility lines observed near the site. A communication antenna is located within 1/4 miles to the west. Site requires radio
communication and solar power. Minimal excavation was required to achieve the road grade (probably less than 1 vertical meter of
volcanic rock was removed). ECI recommends installing a 6-foot tall chainlink fence around the site since it will be located in an
unsecured area. The majority of people passing near the site are communication maintenance crews who service the nearby radio
facilities on Santiago Peak.
Construction Crew PLEASE NOTE:
SURVEY FLAGGING.
Site plan
The roads to take off of the Main Divide Road have been marked with RE
MJP
Site View In North
Site View In South
Site View In West
Site View In East
Site View Out North
Site View Out South
MJP
Site View Out West
Site View Out East
Additional Graphics
Aerial photo showing position of site relative to the Main Divide Road an
JPEG error #62
Date Received