The Integrated Pipeline is a joint water supply project between Dallas Water Utilities and Tarrant Regional Water District. It involves building 150 miles of pipeline to transport up to 350 million gallons water daily from three East Texas Reservoirs into the Metroplex to increase reliable water access. The project recently reached a new milestone when the new tunnel under Trinity River was completed. Workers are now beginning to add 50‐foot sections of 108‐inch diameter steel pipe.

Stiver Engineering performed full design work for the IPL tunnel. The design/build project scope included construction of approximately 3,802 linear feet of 108‐inch water line including 2,614 linear feet of tunnel under the Trinity River and the remainder in deep open cut segments along the proposed alignment of Section 17.

Other aspects include tunnel launch and retrieval portals/shafts, deep open cut approach ramps with temporary shoring at approximately 12:1 slope, pipe laying within approach ramps and tunnel initial support, pipe encasement with flowable fill and reinforced concrete, tunnel grouting, a 15.6‐foot diameter custom designed tunnel boring machine, and precast segmental tunnel lining.

The City of Houston’s Northeast Water Purification Plant (NEWPP) Expansion Project is a design-build project that will add 320 million gallons per day (mgd) by 2024 to the existing water plant’s capacity. The expansion project will allow the City and the regional water authorities to meet projected demands, while fulfilling requirements set by the Harris-Galveston and Fort Bend Subsidence Districts resulting in a shift from historical groundwater usage to a predominant reliance on surface water.

​Construction on the $1.7 billion project started in early 2018 and has been called the largest expansion project in the world. The NEWPP expansion is required to comply with subsidence district rules for conversion from groundwater to surface water supply, resulting in a reduction of the subsidence rate.  Features of the project include the design, construction and commissioning of:

  • Intake pump station
  • Twin 108-inch transmission mains
  • Pre- and post-treatment chemical addition
  • Flocculation/sedimentation basins
  • Ozone treatment
  • Filtration
  • Finished water storage tanks
  • High service pumping station

Stiver Engineering provided construction consulting through the following designs for contractors working on the NEWPP Project:

  • Shoring design for 10,200 LF of twin 108-in.-dia. raw water transmission mains in common trench at a depth of 18 ft. to 40 ft.
  • Pipe buoyancy calculations for the 38,000 CY of controlled low strength material (CLSM) backfill.
  • Entry shaft, exit shaft and tunnel design for the 360-LF, 132-in.-dia. tunnel using liner plate.
  • Shoring design for the filter/transfer pump station.

Emmons Motor Co. is a Houston area automotive dealership that has been operating in Houston, Texas since 1972.  The used car dealership relocated to 16 acres at Interstate 45 and Farm to Market Road 528 in the Clear Lake area.  The total cost of the project is estimated at $15 million and was completed in November 2017.

The new 48,000-square-foot dealership holds roughly 450 cars on-site, up from Emmons’ previous Pasadena location that handled 350 cars. The new dealership also includes a state-of-the-art body shop, a waiting area and an 18,000-square-foot showroom.

Stiver Engineering provided the civil engineering site development services for the Emmons Project.

The Bergamos Spa Retreat is a $6.5 million, 22,000-square-foot day spa and is the largest freestanding day spa in Texas.  It is owned by Marylyn Reed, the great-granddaughter of the late beauty and skincare mogul Mary Kay Ash.  The spa was completely renovated after the facility was destroyed by Hurricane Harvey in 2017.

Stiver Engineering provided the site civil engineering design for the redevelopment of the site after Hurricane damaged the old facilities in 2017.

 

Stiver Engineering assisted in the development of a 9-acre, raw land property located in North Harris County, Texas with no prior development. The services required included existing drainage analysis, proposed drainage analysis, storm sewer designs, grading plans, and more. We also provided the client with a reinforced concrete foundation design for a 23,000 square-foot steel fabrication building.

Stiver Engineering provided site development through permitting services for our client, and the project was permitted by Harris County and TxDOT.