ELECTRICAL SPECIFICATION ENVIRONMENTAL DESIGN DATA 1 of 2

REFERENCE MUK-FAC-122 Rev B Mar 2011 Approved by: Engineering Manager

Occidental Mukhaizna LLCA subsidiary of Occidental Petroleum Corporation

ELECTRICAL SPECIFICATION ENVIRONMENTAL DESIGN DATA

The meteorological conditions are severe; the climate is mainly extremely hot and humid.

The summer is from April to October with June and July being the hottest period.

Ambient temperature

Shade temperature maximum : 550C

minimum : 50C

Black bulb temperature maximum : 820C

Maximum daily variation in temperature : 250C

The maximum shade temperature occurs for short periods only.

Outdoor electrical equipment (switchgear, transformer, motors etc.) shall be designed for 550C ambient temperature.

All indoor electrical equipment shall be designed for 400C maximum ambient temperature to cater for loss of air conditioning supply.

Soil Temperature

Maximum Ground Temperature (summer):

330C @ 1000 mm depth

350C @ 800 mm depth

380C @ 650 mm depth

400C @ 500 mm depth

Minimum Ground Temperature (winter):

200C @ 1000 mm depth

Soil Thermal Resistivity

Average soil thermal resistivity : 300 cm 0C/W

Relative Humidity

Maximum relative humidity : 98%

Minimum relative humidity : 30%

ELECTRICAL SPECIFICATION ENVIRONMENTAL DESIGN DATA 2 of 2

REFERENCE MUK-FAC-122 Rev B Mar 2011 Approved by: Engineering Manager

Occidental Mukhaizna LLCA subsidiary of Occidental Petroleum Corporation

Barometric Pressure

Average barometric pressure : 98.6 kPa

Barometric pressure range : 95.9 to 98.9 kPa

Site elevation

Site elevation above sea level : 157 m

Rainfall

This is infrequent, but when rainfall occurs, it is often combined with hail and sandstorms.

Design rainfall in one hour : 25 mm

Design rainfall average : nil

Sandstorms

These are both frequent and severe; they can continue for days. The atmosphere is heavily laden with dust particles as small as 2 microns.

Wind

Prevailing wind directions:

December/February : NNW

March/May : S

June/August : SSE to SW

Sept/ November : SSE to SSW

Design Wind Speeds:

3-second gusts : 34 m/s

Maximum hourly average : 12 m/s

Solar Radiation

Design (max) Solar radiation : 1.2 kW/m2