Project Overview

The City of Greenville, Texas, relies on Lake Tawakoni as its sole source of raw water. With intake and transmission infrastructure dating back to the 1950s and 1960s, the City launched a major capital improvement program to modernize its delivery corridor. MH Civil was selected to execute the Raw Water Main Parallel Pipe Project and related pump station improvements, a critical infrastructure effort with a contract value exceeding $33 million. The scope featured the installation of a 20-mile-long parallel transmission main and significant upgrades to the Lake Tawakoni raw water pump station.

The Problem

• Single Source Vulnerability: The existing raw water line was the City’s only source of water; any failure in the aging 1950s-era infrastructure posed a catastrophic risk to Greenville’s water supply.
  
• Capacity Constraints: The original system was limited to 19 MGD (million gallons per day), which was insufficient to meet the City’s ultimate future demand of 38 MGD.

• Aging Infrastructure: Decades of service had left the intake and header facilities at the pump station in need of modernization to ensure long-term operational resilience.

Our Solution

The project centered on a massive logistical and engineering effort: the installation of over 102,000 linear feet of 36-inch fusible C900 PVC pipeline. MH Civil self-performed critical scopes, including excavation, pipe installation, and complex jack-and-bore crossings, including over 1,800 linear feet of 48-inch steel casing.

To stabilize the system and prepare for increased flow, the solution included pump station and header improvements, highlighted by the installation of two 25,000-gallon bladder surge tanks and new ductile iron headers. Throughout construction, MH Civil prioritized stakeholder coordination, managing traffic control, utility locating, and proactive public communication to minimize the impact on local residents and businesses.

The Results

Project Overview

The City of Stamford identified the urgent need to upgrade its aging raw water infrastructure to ensure a reliable and high-quality water supply for residents. The original raw water pump station and transmission pipeline, dating back several decades, faced frequent failures, capacity constraints, and increasing maintenance costs. To address these challenges, the city launched a comprehensive pipeline replacement and modernization project. MH Civil Constructors, Inc. was selected to lead the construction, bringing their expertise in municipal water line replacement to efficiently execute the project while maintaining the highest quality standards. Their leadership, integrity, and technical expertise were instrumental in ensuring the success of this large-scale project.

The Problem

• Aging Infrastructure: The existing raw water transmission pipeline had surpassed its useful lifespan, leading to frequent breakdowns and costly repairs.
  Capacity Constraints: The original pipeline was no longer sufficient to meet the city’s growing water demands.
  Water Quality Concerns: Old infrastructure posed potential risks to water quality, necessitating immediate improvements.

Our Solution

After a thorough assessment of the system’s deficiencies, MH Civil implemented a phased installation of over 79,000 linear feet of fusible PVC pipe. Selected for its durability and corrosion resistance, the piping included 14-inch DR-25, DR-21, and DR-18 variants strategically chosen to match specific soil conditions and pressure requirements. The modernized line was stabilized with flowable concrete backfill and integrated with new valves and flushing systems to enhance long-term operability.

Beyond the new installation, the team conducted critical leak repairs on existing 18-inch concrete steel cylinder pipes to prevent water loss during the transition. Throughout the expansive scope of work, MH Civil prioritized safety and environmental protection, utilizing detailed excavation plans to safeguard both the workforce and the surrounding community.

The Results

Project Overview

The City of Stephenville initiated the Eastside Sewer Interceptor – Phase I to address growing wastewater demands, aging infrastructure, and regulatory compliance requirements. This project was designed to expand system capacity, enhance reliability, and replace outdated pipelines to support the city’s long-term development. The total contract value was $21,956,762, with a well-managed budget and change orders accounting for less than 1% of the original contract amount. The project involved significant trenching (25-60′ deep), tunneling, and large-diameter pipe installations to improve wastewater conveyance efficiency.

The Problem

Insufficient Sewer Capacity: Existing pipelines could not accommodate peak flow demands, increasing overflow risks.
Aging Infrastructure: Deteriorating sewer pipes required frequent maintenance and posed structural risks.
Environmental & Regulatory Compliance: Upgrades were necessary to align with state wastewater regulations.

Our Solution

Collaborating closely with city engineers, we implemented a robust plan to replace deteriorating infrastructure with over 16,200 linear feet of large-diameter Fiberglass Reinforced Pipe (FRP). We strategically selected FRP in 30-inch, 36-inch, and 48-inch sizes to ensure superior corrosion resistance and decades of structural reliability.

The project required extensive technical execution, including trenching at depths of up to 60 feet. In high-traffic and environmentally sensitive areas, we utilized trenchless boring and jacking operations with 48-inch to 60-inch steel casings to minimize surface disruption. Additionally, we installed 41 custom FRP manholes designed to withstand fluctuating loads over the long term.

Where the work impacted community spaces, we provided full restoration through trail reconstruction and hydromulching for erosion control. Through diligent safety coordination and constant communication with city stakeholders, we successfully delivered this critical infrastructure upgrade on schedule and within scope.

The Results

The completion of the Eastside Sewer Interceptor marks a turning point for Stephenville’s infrastructure. The upgraded system has increased capacity by 40%, providing a critical buffer for future growth while eliminating the chronic overflow risks that previously threatened regulatory compliance.

By utilizing durable FRP materials, we have extended the system’s operational lifespan by an estimated 50 years, significantly reducing long-term maintenance burdens. This project also serves as a model for fiscal responsibility; with a total contract value of $21.96 million, change orders accounted for less than 1% of the original estimate.

Ultimately, this project highlights the value of strategic execution and premium materials. Stephenville now possesses a resilient, future-ready interceptor system built on a foundation of engineering excellence.