CAPTIONS

							Captions:

WP003-TM1.JPG – Bridge pier for Highway 86 crossing of the New River, Brawley. Shaking may have
caused pier to displace soil.

WP004-TM2.JPG – Slumping of northwest wall of drain along Fites Road. Liquefaction is suspected
because of seepage from Westside Main Canal (note wet area along road to left), which is just to the left
of this picture.

WP005-TM7.JPG – Shallow soil slide and soil block toppling of northwest road cut above the Keystone
Road Bridge across the New River.

WP008-TM2.JPG – Liquefaction sand blow from a fissure in road fill on the southeast side of the
Worthington Road Bridge over the New River. Color of the sand indicates that the material originated
below the fill.

WP008-TM3.JPG – Liquefaction sand blow from a fissure at the base of road fill on the northeast side of
the Worthington Road Bridge over the New River. The color of the sand suggests that fill material was
also liquefied.

WP008-TM8.JPG – Liquefaction-related settlement of approach fill on the northwest side of the
Worthington Road Bridge over the New River.

WP010-TM1.JPG – Shallow but extensive slump into the Westside Main Canal southwest of the
intersection of the Westside main and Fillaree canals. Slump undergoing repairs by track-mounted
excavator. View to the northeast.

WP010-TM2.JPG – Same location as above, view to the southwest.

WP014-TM1.JPG – Relatively small slump into the Westside Main Canal on the west bank.

WP016-TM2.JPG – Set of arcuate cracks across west bank of the Westside Main Canal indicating
insipient slumping into the canal. Last cracks at the feet of the geologist.

4-4-dam_IC_Planning.JPG – Sunbeam Lake dam and outlet a few hours after the earthquake. Sinkhole
has not yet formed. Photo courtesy of Imperial County.

WP017-TM6.JPG – Sink hole adjacent to outlet in the dam at Sunbeam Lake Park. Photo taken 4/8/10,
four days after the earthquake.

WP017-3-TM13.JPG – Sinkhole and outlet on 4/12/10, eight days after the earthquake.

WP017-3-TM16.JPG – Bottom of the sinkhole on 4/12/10. Water is flowing rapidly around the outlet
pipe, taking embankment soil with it.

WP019-TM3.JPG – Large liquefaction lateral spread toward the Rice Drain No. 3, north of Evan Hewes
Highway, between Seeley and El Centro. View to the east. Lateral spread fissures and sand blows can
be seen behind the construction stanchions. Liquefaction features extend 100 meters east of the drain
and affected about 100 meters of the drain bank. The owner of the field reports that the salt cedar
bushes seen in the foreground were originally on the east bank of the drain, and now all were on the
west bank.

 WP020-TM14.JPG – Lateral spread fissures and sand blows in an agricultural field along Evan Hewes
Highway, east of Rice Drain No. 3. View to the south. Fissures show extension and blocks of rigid soil
show subsidence. Fissures were partially filled with wet silty sand that flowed into them.

WP020-TM9.JPG – Sand blows from small fissures in an agricultural field north of Evan Hewes Highway
and the Rice Drain No.3.

WP026-TM10.JPG – Liquefaction lateral spread on Lyons Road east of the New River. While many road
closures were due to liquefaction of bridge approach fills or the natural soils beneath them, on both
Lyons and Nichols roads, liquefaction occurred in sloping colluvial and/or alluvial deposits and the road
on either side of the bridge appeared relatively undisturbed.

WP026-TM7.JPG – Sand blows in an agricultural field north of lateral spread fissures that cross Lyons
Road.

WP027-TM2.JPG – Soffit that dropped onto a breezeway at the Jefferson Elementary School in Calexico.
Soffit composed of concrete/stucco and hung from roof frame by wires.

WP033-TM11.JPG – Liquefaction lateral spread damage to the Calexico Waste Water Treatment Plant,
north of the Calexico International Airport runway and south of the New River. Lateral displacements do
not appear to be very large, owing perhaps in part to the presence of fill adjacent to the road. However,
liquefaction also occurred under the fill and the whole area experienced related disruptions.

WP034-TM7.JPG – Liquefaction sand blow in fill adjacent to the waste Water Treatment Plant access
road. Sand blows were also prevalent in the undisturbed river sediments to the northeast, and many
were apparently re-activated by aftershocks that occurred the previous evening.

WP035-TM6.JPG – Extensive sand blows in undisturbed sediments south of the New River, west of the
Calexico waste water Treatment Plant. View to the west.

WP035-TM6.JPG – Liquefaction lateral spreading with large vertical displacements in dirt road fill on the
west side of the Calexico Waste Water Treatment Plant, and associated with extensive sand blows.
View to the south.

WP036-CP7.JPG – Fine grained soil liquefaction adjacent to the All American Canal support structure
where it crosses the New River. Sand/silt blows, large slumps and many other liquefaction features
were observable here despite recent grading around the canal structures. View to the southeast.

WP037-TM7.JPG – Liquefaction sand blow around the base of a tilted power pole, at the intersection of
the All American Canal and the Westside Main Canal. Sand blows here were concentrated around poles
and the foundation for a small utility shed, suggesting structure enhancement of liquefaction. Lateral
spreading toward the Westside Main Canal also occurred here.

WP037-TM11.JPG – Slack power lines between power poles tilted by liquefaction in the soils at their
bases. All American Canal and Westside Main Canal.

WP039-TM11.JPG – Liquefaction lateral spread and slump in the levee separating the New River from
Fig Lagoon, west of Drew Road and south of I-8. Slumped block appears to have allowed a seiche from
to Fig Lagoon to flow across the levee toward the New River, left to right in this picture. Mud coated
sand blows can be observed in the slumped block.

WP039-TM2.JPG – Sand blow into post-earthquake equipment track on the levee between Fig Lagoon
and New River. Sand blow was likely triggered by an aftershock.

WP045-TM4.JPG – Sand blows in an agricultural field north of Alamo Road and west of the Rosita Canal
near Holtville. View to the northwest. A string of sand blows extends for roughly 700 meters along the
west side of the canal, and to the southeast along Alamo Road, lateral spreading occurred toward the
canal on both sides of it.

WP045-TM6.JPG – Sand blow on the west side of the Rosita Canal. This sand blow was wet on 4/11/10,
suggesting re-activation by aftershocks.

WP054-TM2.JPG – large sand blow on the east side of Rosita Canal, north of Alamo Road near Holtville.
This sand blow is opposite the long string of sand blows on the west side of the canal. Evidence of canal
seepage was near this sand blow and the Imperial Irrigation District was repairing the adjacent levee at
the time of our visit (4/11/10).

WP054-TM4.JPG – Closeup of the large sand blow on the east side of Rosita Canal north of Alamo Road.
The crater is approximately one meter long, 20 cm wide and 40 cm deep.