GRI employs fully trained, HAZWOPER-certified technicians for soil, groundwater, soil gas sampling & indoor air sampling.
Soil Sampling
GRI technicians can collect soil samples using hand augers, or from drilling rigs and excavator buckets. Soil samples can be collected as discrete samples from select depths or composited when covering large areas (e.g., soil stockpiles or surface samples from a large rifle range). Soil borings are logged using the Unified Soil Classification System.
Groundwater Sampling
Groundwater samples can be collected using submersible pumps, peristaltic pumps, bladder pumps, or bailers. GRI technicians can collect samples using low-flow sampling methods or after purging three well volumes. GRI will collaborate with regulatory agencies to design the appropriate sample plan for each site. GRI can also develop (and redevelop) groundwater wells to clear sediment.
Soil Gas Sampling
GRI is also up-to-date on advances in passive soil gas samplers and other alternative sampling methods in low-permeability soil.
Indoor Air Sampling
When soil gas concentrations indicate the potential for risks into indoor air, GRI technicians can collect indoor and outdoor air samples. GRI will develop the sampling plan for regulatory agency approval.
GRI can collect samples for the following:
- Total petroleum hydrocarbons as gasoline (TPHg), diesel (TPHd), motor oil (TPHmo), and others
- Volatile organic compounds (VOCs)
- Semi-volatile organic compounds (SVOCs)
- Dioxanes
- Polychlorinated biphenyls (PCBs)
- Per- and polyfluoroalkyl substances (PFAS)
- Pesticides (OCPs)
- Herbicides
- Metals (Title 22, chromium-6, etc.)
- Fixed gases (oxygen, helium, etc.)
- Groundwater indicator parameters (pH, dissolved oxygen, electrical conductivity, oxidation reduction potential, etc.)
- Others (cyanide, nitrates, sulfides, etc.)
