Environmental

With deep expertise in both passive (gravity-based) and active (mechanical) dewatering systems, Brennan offers the flexibility to handle a range of challenges—from dredged material management and sediment consolidation to full-scale water treatment when needed; we handle the whole operation from proposal to disposal.

Every project starts with a thorough evaluation of site conditions, sediment characteristics, water chemistry, and performance goals. From that foundation, we recommend the optimal blend of separation and dewatering methods that balances efficiency, cost, and environmental compliance.

Dredged Material Separation Options

• Hydrocyclones
• Shaker screens
• High-speed shaker tables
• Sand wheels and more

Geotextile Tubes

We have successfully dewatered more linear feet of geotextile tubes than any contractor in the United States. Whether working on a small, temporary dewatering pad or a large, long-term cap-in-place landfill or disposal facility, our experts fill and stack geotextile tubes to maximize both available space and material dewatering.

Containment Facilities

Brennan constructs and operates confined disposal facilities with structural integrity and operating capacity to withstand dynamic slurry discharge. We are experts in creating and utilizing weir structures that meet targeted effluent quality.

Mechanical Dewatering

Depending on the project, dewatering equipment can be mobile-skid or trailer-mounted, semi-permanent, or permanent installations. We systematically determine and implement the most suitable high-speed dewatering method for each project.

Material Separation

Dredge slurry is filled with debris, sticks, rocks, and vegetation. We use a wide range of equipment options to mitigate risks associated with debris management and material separation.

We offer laboratory and in-field testing of sediments, sludges, and industrial residuals to inform remediation strategies. Our studies support proper material handling, water treatment methodologies, and permit compliance. Using the data our experienced chemists acquire, we implement the most cost effective, full-scale solution for your remediation project.

Comprehensive Lab Studies We Perform

• Chemical flocculant, coagulant, and polymer optimization
• Soil amendment trials
• Geotextile tube dewatering tests (GTDT)
• Paint filter and compressive strength analysis
• Turbidity and total suspended solids (TSS)
• Mechanical dewatering and processing trials
• Rapid dewatering tests (RDT)
• Wastewater treatability study

Gain complete clarity below the surface for your project. At Brennan, we combine cutting‑edge technology with expert field teams to deliver detailed, reliable insight into underwater conditions. Whether it’s for safety, maintenance, permitting, or design, our inspection and survey services help you make informed decisions. With 100+ ADCI-certified divers on staff, we conduct a thorough assessment of your structure, identify areas of interest, and produce a detailed report that can be used for further analysis.

Areas of Survey & Inspection Expertise

• Multibeam and single beam bathymetric surveys
• Side-scan sonar
• Underwater acoustic imaging
• Dive inspections
• Photogrammetry
• Remotely operated vehicles (ROVs)
• Licensed drone pilots
• Unmanned aerial vehicles (UAVs)

We have been restoring aquatic and wetland environments in remote or urban settings for decades. Our habitat restoration services include re-establishment of vegetation, grading, hydrology restoration, soil amendment, and erosion control. Our team has the proficiency and specialized equipment to tackle large-scale restoration projects while minimizing the impact on critical aquatic ecosystems.

Wetland Remediation

Wetland remediation is a delicate process and we specialize in areas that are too soft for heavy equipment or inaccessible by conventional barges. We use amphibious platforms, hand crews, or low-impact methods to protect vulnerable habitats.

Areas of Wetland Restoration Expertise

• Beneficial reuse of dredged material
• Habitat rehabilitation
• Invasive species removal
• Island-building