1. A Diversified International Construction Company

2. Introduction

3. Primoris Services Corporation PRIMORIS SERVICES CORPORATION Cardinal Contractors, Inc. ARB, Inc. ARB Structures, Inc. Onquest, Inc. Cardinal Mechanical Primoris Renewable Resources Onquest Heaters, Inc. Born Heaters of Canada, Ltd. ARB International LTD ARB Ecuador Cia, Ltda. ARB Arendal, S.de R.L. de C.V. 49%

5. Develop directional drilling expertise

6. Specializes in designing and supplying high performance furnaces for the oil industry

7. Process engineering and modeling of process plants

8. Furnishes environmental solutions

9. Acquires Oilfield Construction Co. (CA)

10. Expertise in the construction of energy processing facilities

11. Formed basis of the Industrial Group

12. Acquires Macco Constructors, Inc. (CA)

13. Established ARB as the largest pipeline construction company in California

14. Increased presence in Los Angeles basin

15. Energy crisis in late 2000/early 2001

16. Brian Pratt becomes President

17. Grows ARB from a $15mm revenue business in 1983 to the Company’s current size

18. First entry into foreign markets/South America

19. Primoris is formed

21. Develops Steel Structure capabilities

22. Separated from Macco-Robertson

23. Separated from Alex-Robertson

24. ARB is incorporated as separate state organization

25. Acquires Cardinal Contractors (FL)

26. Expertise in design/build water/wastewater facilities

27. Establishes footprint in Florida

28. Acquires OFCCO Constructors (CA)

29. Expanded ARB’s California customer base and industrial construction expertise

30. Onquest acquires Born Canada (Alberta)

31. Refinery furnace designers

32. Burner management engineered systems

33. Acquires Saffel & McAdam (CA)

34. Establishes ARB’s concrete structure design and construction capabilities

36. Publicly Traded California Corporation

37. Diversified General Contractor

38. ENR ranked #104 domestically in 2008 and 36 among international contractors

39. Top Industrial and Underground contractor on West Coast

40. 2008 Domestic Revenue - $650,000,000+

43. Fiber Optic

44. Rehabilitation

45. Electric Transmission

46. Gas Distribution

47. Emergency Repair & Testing

49. Power Generation

50. Renewable Energy

51. Alternative Fuels

52. Water/Wastewater

53. Liquid Terminals

54. Oil & Gas Facilities

55. Mining & Manufacturing

56. Industrial Process Plants

57. Central Plants

59. Lake Forest, CA

60. Bakersfield, CA

61. Las Vegas, NV

62. Pittsburg, CA

63. Houston, TX

64. Conroe, TX

65. San Diego, CA

66. San Francisco, CA

68. Quito, EcuadorSan Francisco Las Vegas Pittsburg Bakersfield United States Lake Forest San Diego Houston/Conroe Mexico Sarasota Monterrey Quito Ecuador

70. Diverse specialties

71. Experienced management

72. Self performing labor force

73. Innovative solutions

74. Quality workmanship

75. Cost and schedule performance

77. Project specific safety planning

78. Behavior Based Safety

79. Craft Safety Observer program

80. Nearly 15 million man-hours in 2007 & 2008

82. Experienced maintenance personnel

83. Equipment fleet strategically located throughout California

84. Most modern equipment fleet in the industry meeting AQMD Tier 2 requirements (meets Port of LA requirements)

85. ARB’s plan is to meet AQMD Tier 3 requirements within the next two yearsCorporate Headquarters Equipment Yard

87. Project team ownership

88. Resource loaded for earned value & manpower planning

89. 3-week look-ahead developed from P3 schedule

91. Committed cost system

92. Quantity tracking for earned value

94. Project Experience Otay Mesa Generating Station 540 MW 2x1 GE 7FA CTG, Siemen’s STG Owner – Calpine Corporation Engineer – Burns & Roe Location – San Diego, California Scope - Civil/Foundations, ACC Erection, CTG & STG Erection, Structural steel, piping and balance of plant equipment

95. Project Experience Niland Gas Turbine Plant 100 MW - Dual GE LM 6000 Gas Combustion Turbines Owner – Imperial Irrigation District Engineer – Harris Group Location - Niland, California Scope – Complete turn-key green-field construction including Civil/Foundations, HRSG Erection, CTG & Structural steel, I&E, piping and balance of plant equipment

96. Project Experience Moss Landing Power Plant 1060 MW Combined Cycle Power Plant 4x2 GE 7FA CTG Owner – Duke Energy Engineer – Duke/Fluor Daniel Moss Landing, California HRSG erection, high energy piping installation

97. Project Experience Paramount Petroleum Paramount added gasoline production and clean burning diesel to its existing capabilities in 2005. ARB installed all carbon and alloy piping for the two new units.

99. Fluid Feed Hydro Desulfurization UnitEngineer – Jacobs & Fluor Location – Carson, California Scope – Cast in place piles, foundations, structural steel, equipment erection, piping, I&E

100. Project Experience Hydrogen Reformer Hydrogen Reformer 96 SCFMMD Owner – Air Products & Chemical, Inc. Engineer – KTI Carson, California Erect hydrogen reformer heater, convection section and related piping.

102. 1800 tons structural steel

103. 80,000 LF Piping

106. LUZ project at Kraemer Junction, California at the SEGS (Solar Electric Generating Station) Units 8 & 9. Parabolic trough installation in 80 MW blocks for each unit. Included the fabrication and installation of structural steel, rebar and concrete work

107. Roof mounted PV panels, such as Santa Monica parking structureSolar photovoltaic panels installed at the ARCO Solar facility at Carrisa Plains, California

108. Project Experience Southern California Gas Company 19 Miles of 24-inch Natural Gas Pipeline Etiwanda through Fontana to the Mountain View Power Plant in San Bernardino, CA Southern California Edison 10 Miles of 16 and 24-inch Pipeline Port of Los Angeles to Dominguez, CA Kinder Morgan Energy Partners 70 Miles of 20-inch Pipeline Concord to Sacramento, CA

110. Los Angeles Dept. of Water & Power

111. Occidental

112. Pacific Gas & Electric

113. Peerless Manufacturing Company

114. Pemex

115. Plains All American

116. Port of Long Beach

117. Port of Los Angeles

118. Port of San Diego

119. Praxair

120. Raytheon

121. Reliant Power

122. Siemens Westinghouse

123. Sempra Energy

124. Shell Oil

125. Sunrise Power, LLC

126. Tesoro

127. U. S. Borax & Chemical Co.

128. Valero Energy

129. ABB

130. Air Products

131. Alstom Power

132. BP

133. Bechtel

134. Black & Veatch

135. British Petroleum / Amoco

136. California Energy Co., Inc.

137. Calpine Corporation

138. ChevronTexaco Corp.

139. ConocoPhillips

140. County Sanitation Districts, Los Angeles

141. Department of Water Resources

142. Duke Energy

143. Dynegy

144. Edison/Mission Energy

145. Elk Hills Power LLC

146. Fluor Constructors

148. Experienced in Renewable Energy & Alternative Fuels

149. Financial stability

150. Large capital project experience

151. Largest established craft labor force in California and the West

152. Strong local subcontractor relationships

153. Competent project management and staff

154. Proven track record of completing safe, quality projects

155. Success with target contracting delivery

156. Construction environmental mitigation compliance

157. Outstanding relationship and reputation with local Building Trades

158. Largest equipment fleet on the West Coast

159. Experience with project labor agreements