Established in 1995, Pacchiosi Drill U.S.A., Inc (Pacchiosi USA) is the US subsidiary of the international company Drill Pac S.r.l. of Roma, Italy. The Drill Pac family of companies operates on a worldwide basis with its principal focus on Jet Grouting.

For over 40 years, Drill Pac Group manufactures its own State-of-the-Art Jet Grouting equipment, including: different models of drill rigs, automated grout mixing plants, high pressure pumps, real-time data recording systems, and most associated jet grouting accessories and tools (rods, injection monitors, swivel heads, jet nozzles, etc.). Its equipment and jet grouting technology are in use on every continent. As a manufacturer of jet grouting equipment or as a specialized contractor, Drill Pac Group has been involved in hundreds of projects encompassing millions of linear feet of Jet Grouting treatment.

Pacchiosi USA was a pioneer in the introduction the Jet Grouting technique in North America the 1990s.

The very successful application of the Jet Grouting method by Pacchiosi USA for the 63rd Street Line Connection Project in New York, in 1995-1997, was critical in the wider acceptance of the Jet Grouting as a viable ground improvement method in USA. For this project, three deep underpinning/cutoff walls were installed through dense glacial soils directly below and each side of the active five-line 63rd Street Line Subway Tunnel to allow for the construction of the two new connecting tunnels merging into the existing tunnel.

From 2001 to 2002, Pacchiosi USA completed for the US Army Corps of Engineers the installation of deep jet grout cutoffs at five different locations to close gaps in the cutoff system of the American River levee system in Sacramento, California. These Jet Grout cutoffs were constructed at the crossings of railroads, roads and large subsurface utilities with the alignment of the dike.

From 2003 to 2004, Pacchiosi USA was responsible for the ground improvement by the Jet Grouting method of over 30,000 m3 (over 39,000 cubic yards) of alluvial and glacial soils for the West Side CSO Tunnel Project, in Portland, Oregon. Jet Grouting was performed at the break-in and break-out zones of the TBM tunnel with slurry wall shafts, to protect the foundations of existing bridges and to provide deep groundwater control during the excavation of shafts. At the Pump Station Shaft, the Jet Grout cutoff wall was installed to a maximum depth of 103 m (338 ft) through glacial soils.

From 2006 to 2009, Pacchiosi USA installed a complex deep Jet Grout cutoff wall to encapsulate tar contaminated soils at the former Clifton OU-1 Former Manufactured Gas Plant (MGP) Site, in Staten Island, New York. Triple-fluid Jet Grouting was performed to depth of up to 37 m (122 ft) through difficult soil conditions consisting of fill with large construction debris, glacial till with cobbles and boulders and fluvio-glacial soils. Artesian conditions where present in the deep fluvio-glacial soil layer.

From 2013 to 2016, Pacchiosi USA completed a series of four separate contracts for the US Army Corps of Engineers for the installation of deep jet grout cutoffs for the reinforcement of the levee system of the American River, in Sacramento, California. All Jet Grouting on this project were performed using the triple-fluid method to depth of up to 22 m (73 ft) through the dike embankment material and alluvial soil formations containing cobbles and boulders.

In 2021-2022, Pacchiosi USA was responsible for the installation of two deep Jet Grout cutoffs through the foundations of the existing levees of the American River in Sacramento, California, for the US Army Corps of Engineers. Jet Grouting was installed below and around multiple large subsurface utilities and structures to depths of up to 35 m (115 ft) through variable alluvial soil layers containing cobbles.

Under a subcontract started in 2018, Pacchiosi USA is currently responsible for the jet grouting stabilization of over 68,000 m3 (90,000 cubic yards) of soils for the construction of the Parallel Thimble Shoal Tunnel, in Virginia Beach, Virginia. Jet Grouting is used on this project for the construction of the base bottom plug at the two approach structures of the new tunnel, to stabilize and reduced permeability of soils at the TBM break-in and break-out zones with shaft and to stabilize soft soils on the alignment of the future TBM tunnel. This jet grouting work is scheduled for completion in 2023.

Under a subcontract started in 2021, Pacchiosi USA is currently responsible for the Jet Grouting stabilization of over 100,000 m3 (135,000 cubic yards) of soils as part of the I-64 HRBT Expansion Project in Norfolk, Virginia. Jet Grouting is used on this project for the construction of the base bottom plug at the two approach structures for the two new tunnels, and to stabilize and reduced permeability of soils at the TBM break-in and break-out zones with shaft. This Jet Grouting work is scheduled for completion in 2023.

More details about the above Jet Grouting projects or other projects completed by the Drill Pac Group of companies can be found in the company website.