Surface and groundwater sampling

GASS is a proven specialist at assisting its clients with all surface and groundwater monitoring requirements. We have been consistently investing in the latest equipment to offer low-flow and conventional purge sampling, in addition to passive diffusive or grab sampling. We have secured samples up to depths of 180 m below the surface using bladder-pump technology.

Groundwater and surface water sampling have formed the foundation of the company’s earliest services since its inception. The team has acquired the skills and equipment to complete any monitoring project. We have ongoing contracts with clients throughout Africa having worked in Benin, Mozambique, Tanzania, Namibia, Botswana, and Swaziland. Our team is skilled at conducting conventional purge and sample, low-flow sampling according to EPA methodology and grab sampling from surface water and groundwater sources using bailers or specific grab-sampling equipment. Moreover, we have the in-house capabilities to source, manufacture and maintain site-specific sampling equipment according to clients’ needs.

We have a full range of QED bladder pumps capable of sampling from depths up to 180 m and the appropriate pneumatic controllers to operate the pumps. Our QED sample pro pump is a simple bladder pump that can be stripped in the field for decontamination in minutes and then reassembled to sample the next borehole. Our pumps range in diameter from 15 mm to 140 mm, which affords us the advantage to sample the narrowest piezometers.

GASS also has all the necessary ancillary equipment to offer a professional sampling service. The spec of in-house equipment includes a range of interface meters, water level meters, flow-thru cells, Hanna multiparameter, hand-held pH, DO and EC meters, cooler boxes, Heron level temperature and conductivity (LTC) meters, field cameras capable of recording up to 150 meters below ground level and photoionization detectors (PID's).

Soil and sediment sampling constitutes an integral part of a site characterization investigation. Correctly collecting soil or sediment samples is imperative to make educated assessments of site conditions. We have a proven track record of working on hundreds of investigations in which we have seconded team members and equipment to assist with obtaining representative samples. GASS is equipped to obtain soil and/or sediment samples from up to 8 meters below ground. We work with innovative equipment such as Shelby tubes and split spoon samplers, and hand augers. We also have direct push capabilities.