As the costs for surface restoration continues to rise and the restrictions on work zones increase, the ability to construct pipelines with trenchless or “no dig” methods is becoming more and more of a necessity. Some of the types of trenchless projects we are involved with are:

---

Experienced With:

• Horizontal Directional Drilling
• Microtunneling (EPB)
• Auger Bore & Jack (TBM)
• Sliplining Existing Pipe
• Cured-In Place Liner
• Pipe Bursting
• Tunnels (segmented)
• Related pits, shafts & shoring

---

Downloads:

---

Back to Project Types Page

Trenchless Projects:

	A Line Relief Interceptor Phase 2A Location: Concord Contract Value: $20,650,750 (microtunnel) Completion Date: Current
	Pajaro Valley Water Location: Watsonville, CA. Contract Value: $17,791,160 Completion Date: June 30, 2008
	Courtland Sewer Location: Walnut Grove, CA. Contract Value: $12,595,813 (HDD) Completion Date: Current
	Dougherty Valley Tunnel & Trunk Sewer Location: Dublin, CA. Contract Value: $12,498,329 (Tunnel) Completion Date:
	East Jack London Sewer Location: Livermore, CA. Contract Value: $625,220 (Slipline) Completion Date:
	Hwy 4 Sewer Force Main Location: Discovery Bay, CA. Contract Value: $3,558,162 (Slipline) Completion Date: Current
	Lower North West Interceptor Location: West Sacramento, CA. Contract Value: $62,453,445 (microtunnel) Completion Date:
	South Orinda Sewer Improvements Location: Orinda, CA. Contract Value: $11,284,550 (micro 98 project of year) Completion Date:
	Northern Pipeline Completion Location: Stockton, CA. Contract Value: $14,605,099 (Micro, & Tunnel) Completion Date:

Back to Project Types Page

Trenchless Projects FAQ

Will using trenchless methods be more cost effective on my project?

By asking some basic question about surface conditions, site access, work zone easement, and soil conditions we can often determine whether trenchless construction or staying with more typical open-cut installation will make more economic since.

How can you protect existing underground utilities using trenchless methods?

A number of procedures are used depending on the situation, but common techniques would be pothole to locate and verify all crossing, designing the crossing with sufficient clearance, and supporting the necessary utilities.

What types of pipelines can be installed using trenchless technology?

Almost all diameters and both pressure and gravity pipes can be either installed or rehabilitated with trenchless methods.

What is HDD (Horizontal Directional Drilling), and when would I use that method instead of bore and jack or microtunnel?

HDD uses guided drilling for creating an arc profile. This technique is best used for drilling long distances to install smaller diameter (under 36-inch) pipelines or cables. The process involves three main stages: drilling of a pilot hole, pilot hole enlargement, and pullback installation of the carrier pipe.

Back to Project Types Page