14 - Pit Dewatering K5 - RTM

Rio Tinto Minerals – Dewatering K5

Project: Dewatering K5 Description of Work: Installed pipeline from K5 to TC2, near Plant 10. Contract Number: 3101520259 Type of Contract: Prime Contract Agency or Company work performed for: Rio Tinto Minerals, US Borax Inc. Address of Agency or Company: 14486 Borax Road, Boron, CA 93516 Initial Contract Amount: $32,025.00 Final Contract Amount: $32,025.00 Customers Contact Name & Phone: Quentin Vandal – (218) 341-1156

12 - P531 - RTM

Rio Tinto Minerals – P531 BAP Pond 6 LCRS Automation

Project: P531 BAP Pond 6 LCRS Automation Description of Work: Pumped liquid between BAP Ponds and installed piping (3,000 feet of 3” HDPE) and pumps. Purchased and installed evaporation system including docks, piping, and pumps. Installed tee and Y’s to route lines correctly. Flushed lines multiple times and washed build up off of dock at Pond. Stretched…

11 - BAP Pond Bypass System - RTM

Rio Tinto Minerals – BAP Pond Bypass System Piping and Valves

Project: BAP Pond Bypass System Piping and Valves Description of Work: Installed 13,240 feet of SDR 17 HDPE with tees and valves. Contract Number: 3101605637 Type of Contract: Prime Contract Agency or Company work performed for: Rio Tinto Minerals, US Borax Inc. Address of Agency or Company: 14486 Borax Road, Boron, CA 93516 Initial Contract Amount: $143,595.00 Final Contract Amount: $149,040.00 – Increased Scope…

10 - Hydroseeding - RTM

Rio Tinto Minerals – Slope Prep and Hydroseeding

Project: Slope Prep and Hydroseeding Description of Work: Slope access and Preparation, dozer seeding, and hydroseeding of 10.5 acres of south overburden final slope. Contract Number: 3101605501 Type of Contract: Prime Contract Agency or Company work performed for: Rio Tinto Minerals, US Borax Inc. Address of Agency or Company: 14486 Borax Road, Boron, CA 93516 Initial Contract Amount: $49,957.00 Final Contract Amount: $49,957.00…

9 - Tortoise Fence - RTM

Rio Tinto Minerals – Tortoise Fence Construction

Project: Tortoise Fence Construction Description of Work: Installed approximately 7,700 line feet of tortoise fencing and performed associated earthwork. Contract Number: 3101654525 Type of Contract: Prime Contract Agency or Company work performed for: Rio Tinto Minerals, US Borax Inc. Address of Agency or Company: 14486 Borax Road, Boron, CA 93516 Initial Contract Amount: $95,900.00 Final Contract Amount: $95,881.00 Customers Contact Name & Phone: Timothy…

6 - Dewatering - RTM

Rio Tinto Minerals – Mine Dewatering Well Pipeline

Project: Mine Dewatering Well Pipeline Description of Work: Installed new mine dewatering well pipeline. Contract Number: 3101757790 Type of Contract: Prime Contract Agency or Company work performed for: Rio Tinto Minerals, US Borax Inc. Address of Agency or Company: 14486 Borax Road, Boron, CA 93516 Initial Contract Amount: $45,365.00 Final Contract Amount: $45,365.00 Customers Contact Name & Phone: Renee Doyle – (760) 762-7501

4 - CARMA Road Restoration

California Institute of Technology – CARMA Road Restoration

Project: CARMA Road Restoration Description of Work: Provided road deconstruction, road restoration, and road removal by the collection of all non-native soils, trucking, and disposal of all non-native soils for the former radio telescopes, equipment pads, transformer pads, and associated buildings. Increased scope included the excavation, removal, and disposal of diesel contaminated soils at former Generator Building.…

3 - CARMA Concrete

California Institute of Technology – CARMA Concrete Removal

Project: CARMA Concrete Removal Description of Work: Provided the demolition, trucking, and disposal of concrete foundations for the former radio telescopes, equipment pads, transformer pads and buildings at location. Contract Number: 70-S256745 Type of Contract: Prime Contract Agency or Company work performed for: California Institute of Technology Address of Agency or Company: 100 Leighton Lane, Big Pine, CA 93513 Initial Contract…