Sharyland Business Park – Roadway and Drainage Improvements
Location:
Mission, Texas
Client:
City of Mission, Texas
Contract Value:
$5.3 Million
Project Dates:
March 2022 – November 2023
• +/- 8000 LF of Waterline
• +/- 5,900 LF of Sanitary Sewer
• +/- 6,150 LF of Storm Drain
• 12” Flexbase Installation
• +/- 36,000 SY of Roadway Installation
PROJECT OVERVIEW
This project encompasses drainage and site improvements for the city of Mission, including scopes such as excavating a drainage ditch, installing sanitary sewer lines and maintenance holes, and implementing a comprehensive drainage system. Additionally, the project included a specialized component, which required the jacking underneath a railroad to facilitate the installation of the drainage system.
The project is a 180-acre park development. The scope included utility installation, road work, and mass excavation. Utilities included water, wastewater, and stormwater. Roadwork includes compaction and asphalt paving.
Site improvement of +/- 170-acre commercial subdivision. Scope of work includes site clearing and grading, mass excavation (+/- 190,000CY), installation of +/-8000LF of waterline, +/-5,900LF of sewer line(as deep as 14′ below ground), +/-6,150LF of storm line as deep as 10’below ground, +/-36,000SY of roadway installation composed of 3% subbase lime treatment, 12″ flexbase installation, 3″ HMA installation, sidewalks, curb & gutters.
WHAT MADE THIS JOB COMPLEX
The project became particularly complex due to the presence of groundwater during the utility installation phase and boring under railroad. Managing groundwater introduced challenges in excavation and trenching operations, especially for sewer utilities. Additionally, activities being performed near the railroad tracks posed logistical and safety concerns. Installing utilities and constructing the drainage basin so near the tracks demanded precise coordination with the railway authorities to avoid any potential interference with train operations. The proximity meant that vibrations from passing trains could affect trench stability, necessitating additional structural reinforcements or adjustments to work timing to minimize risk.
HOW POSILLICO SOLVED IT
After receiving permission from the owner, groundwater intrusion required constant dewatering to maintain stable conditions for trenching and excavation, adding to the logistical challenges and the need for specialized equipment. Simultaneously, working near the railroad tracks posed safety risks and required careful coordination with rail authorities to prevent disruptions to train operations. Vibrations from passing trains threatened trench stability, demanding reinforced measures and precise timing to mitigate risks, making the project both technically and logistically demanding.
