Geotechnical Engineering Services

GEOPlus Partners analysis of geotechnical conditions is performed utilizing proven methods as well as modern technology, as appropriate.

Geotechnical Engineering entails collecting specific information about site soil, rock and groundwater conditions, testing soil and rock in the field and laboratory to evaluate engineering parameters like strength, permeability, expansion, and compressibility, performing analysis to estimate the likely performance of planned improvements relative to soil/rock conditions, and finally, preparing a report presenting design and construction recommendations for planned improvements, including:

  • Site earthwork
  • Excavation and slopes
  • Structure foundations including shallow and deep systems
  • Dewatering
  • Concrete slabs-on-grade
  • Retaining structures
  • Pavements, and
  • Underground facilities
  • Ground Improvement
  • Stormwater retention facilities

GEOPlus Partners’ engineers and geologists have extensive experience evaluating site conditions and developing effective strategies to mitigate potentially adverse site conditions that can increase the cost of development. GEOPlus Partners has provided geotechnical services for many types of projects including:

  • Residential development
  • Commercial & industrial facilities
  • National and State Parks
  • Civic facilities
  • Schools & hospitals
  • Power generation & distribution
  • Highway construction & emergency repairs
  • Wastewater treatment plants
  • Dams and reservoirs
  • Investigation of failures
GeoPlus Partners.
Emergency highway repair – tie-back reinforcement of failing metal bin wall - State Route 70, Twain, CA
GeoPlus Partners.
Compaction grouting ground improvement – Anderson Family Health Clinic, Anderson, CA

Engineering Geology Services

Although often overlooked, evaluation of geologic structure, materials, geomorphology and geologic history provides critical information for project planning and design.

Engineering geology is critical to evaluation of:

  • Rock slopes and landslides
  • Erosion and seepage control
  • Grading design and construction
  • Groundwater resources
  • Rock excavatability
  • Fault hazards / capability analysis
  • Seismic shaking hazards
  • Mineral resources
  • On-site sewage disposal systems

Additionally, understanding site geology assists the civil and geotechnical engineer in evaluation of soil settlement and collapse, bearing capacity, liquefaction, seepage, infiltration, and soil/bedrock heave.

GEOPlus Partners geologists and engineers have extensive experience with evaluation, risk assessment and impact mitigation of the above discussed geologic and geotechnical conditions and more. We have provided our services for such projects as:

  • Highway construction & emergency repairs
  • National and State Parks
  • Hillside development
  • Commercial & industrial facilities
  • Schools & hospitals
  • Retail centers
  • Civic facilities
  • Power generation & distribution
  • Groundwater supply development
  • Wastewater treatment & disposal
  • Pipelines and reservoirs
  • Investigation of failures
Geo Plus Partners.
Trenching through lahar “lava cap” with a rock wheel – Chico, CA
GeoPlus Partners.
Temporary Construction access soldier pile wall – I-5 Antlers Bridge, Lakehead, CA

Environmental Engineering And Hydrogeological Services

GEOPlus Partners client-oriented approach is designed to benefit the outcome of your project relative to environmental due diligence, entitlements, project development permitting, AAI, and regulatory compliance.

Environmental engineering services provided by GEOPlus include:

  • Phase I and Phase II Environmental Site Assessments
  • Remediation / Site Closure
  • Environmental Compliance and Groundwater Monitoring
  • Erosion and Sediment Control
  • EIR Support
GeoPlus Partners.
Specialized well design for avoidance of fecal coliform contamination – Plum Valley School, Paynes Creek, CA

GEOPlus Partners professionals have extensive experience with groundwater resource development as well. Hydrogeological services we provide include:

  • Well siting and design
  • Yield and quality assessment
  • Well Rehabilitation

We have provided environmental and groundwater resource consulting services for such projects as:

GeoPlus Partners.
Stepped Pump Test – Land O’ Lakes Dairy Products, Orland, CA
  • Residential Developments
  • Large Retail Centers
  • Wastewater and Drinking Water Treatment Plants
  • Schools
  • Wood Products Facilities
  • Mining Properties
  • Food Industry Facilities
  • Dairy and Beef Ranches
  • Chemical Manufacturing Plants

On-Site Waste Water Treatment Services

GEOPlus Partners assists new and existing homeowner’s requiring on-site waste water disposal systems in assessing site soil, rock and groundwater conditions impacts, and selecting an appropriate system that satisifies current County Environmental Health Department requirements.

GeoPlus Partners.
Percolation Testing – Chico, CA

Recent changes by the California Water Quality Control Board’s disposal requirements have imposed more stringent standards to the discharge to groundwater from on-site waste disposal systems, with greater emphasis on the percolation characteristics of the site and separation from historical or anticipated high groundwater.

Preliminary site work consisting of a desk survey of available soil and geologic maps, as well as experience in the area so that likely disposal site conditions potential impacts on disposal system type can be considered when siting the disposal area.

Dispsoal site soil, rock and historic groundwater characterization is then assessed by logging the soil/rock conditions exposed in test pit excavations.  Soil characteristics including particle size and distribution, presence of mottling, structure, consistence, roots, pores and boundary conditions between soil horizons.

Based on the soil and evidence of historical groundwater conditions the suitability of various potential systems including conventional in-ground disposal trenches to above ground engineered systems are considered to select an appropriate depth for percolation testing.

Percolation testing consists of excavating and preparing from 3 to 6 excavations and installing test apparatus that reduces impacts of side wall sloughing and facilitates measuring test water levels is performed and a range of infiltration rates measured.

Data reduction leads to selecting an appropriate design for the site condition. If a conventional leach line dispersal system is not feasible, designs for supplemental treatment and/or dosing systems including recirculating sand, mound and/or proprietary systems are prepared.

GeoPlus Partners.
Wisconsin Mound Septic Disposal System, Redding, CA