BASELINE STUDIES



HYDRO-GEOLOGY

Through experienced and motivated Hydrogeologists, MTL is capable of undertaking hydrogeology and groundwater investigation studies for both environmental management and water supply.

MTL uses geo-physical methods to locate groundwater resources, particularly for the mining and water Projects. MTL also undertake groundwater/hydrogeological inventores, groundwater flow and groundwater levels assessment, groundwater recharge, groundwater inflow into the pits, dewatering assessment and groundwater impact assessment.

Other services include pump tests, assessment groundwater quality and pollution plumes, aquifer characterizing, ARD investigations etc.


HYDROLOGY

MTL underpins that hydrological baseline study is crucial undertaking for successful development of the Project. MTL also believes that environmental and Project benefits may be achieved as a result of hydrological impact management.
We bring reputable methodologies, leading edge technologies and transfer of knowledge and skills to practically manage development impacts on hydrological responses during project planning.
Our experts have significant philosophical knowledge on how Project may affects hydrological responses, and how hydrological responses may affect the Project and/or Project facilities. To counteract these cases, MTL is indebted to integrate the engineering and consulting skills in provision of the following services, among others:

  • Hydro census-Water sources identification and mapping
  • Water Flow Assessment-Measure water flows by current meter, Q-Liners and V-Notch
  • Project Water Demand (Operational Water Balance) and Water Availability (Ambient Water Balance).
  • Root cause analysis of the hydrological responses changes. Prediction of Hydrological process, quality and quantity.
  • Water Quality Assessment-Collecting water samples and assessing physical, chemical and biological indicators of water quality.
  • Development of the feasible hydrological impact, monitoring and management programs.

VISUAL AMENITY ASSESSMENT

Visual Impact Assessment is undertaken to assess any visibility impacts that might be caused by the proposed Projects. This is undertaken by identifying the affected receptors and accessible viewpoints to residential areas or public. The visual impacts assessment considers the sensitivity of landscape receptors, the magnitude of an effect and the significance of an effect which depends on the receptor’s sensitivity and the magnitude of the effect.  In order to assess and identify the changes or any modifications, MTL uses the view shed analysis with GIS as well as stakeholder engagement in undertaking Visual Impact Assessments.

Undertaking Visual Impact Assessment is not a legal requirement as per Tanzania legislation, however, most of our clients who require the international compliance such as AfDB, IFC and WB are required to undertake the visual study,(www.ifc.org/performance+standards). Based on this requirement, MTL has successfully undertaken a number of Visual Impact Assessments over the 20 years of experience.


OCCUPATIONAL AND HEALTH SAFETY (OHS)

MTL Consulting undertakes Health Impact Assessment (HIA) to gather understanding of the Project health environment prior to Project development. HIA is assessed in two categories, Community Health (CHIA) and the occupational health and Safety (OHS). The process is guided by the IFC performance standard 2 and 4, OHSA 180001 and the Environmental, Health and Safety Guideline stipulated by World Health Organisation (WHO) HIA.

The study aims at gathering baseline data on health, safety and occupational conditions before commencement of the Project, identification of the health determinants; risks factors and beneficial impacts to the communities in the impact area and company workers as a whole.


RADIATION

MTL Consulting undertakes Radioactivity Survey to gather understanding of the project radiation level prior to project development. Radiation survey is assessed in two categories, outdoor radiation (Environment) and the indoor radiation (occupational health). The study aims in gathering data on the baseline radiation conditions of the project area, identification of the health determinants; risks factors and beneficial impacts to the communities and to the workers.




Chemical characteristics

Prior the analyses the collected soil samples for laboratory analyses are pre-treated based on the following procedures:

  • Drying the soil samples by placing them in a shallow tray in a well ventilated, dust and wind free area.
  • Breaking the clay clods, crushing the soil lumps in order to remove gravel, roots and large organic residues and
  • Sieving the soil samples through a 2 mm sieve, and ground them in a mortar in order to pass through a 60 mesh screen ready for chemical analysis

Soil pH and electrical conductivity (EC) is measured in H2O suspension (1:2) and detected directly using a probe. Total Nitrogen determination employs semi-kjeldahl digestion method in accordance to Allen (1999) while soil organic matter is evaluated using Walkley-Black potassium method (Nelson and Sommers, 1999). The available phosphate is established using Bray P-1 method developed by Emteryed (1989). Amounts of exchangeable bases (K, Ca, and Mg) and cation exchange capacity (CEC) is measured after successive extraction using 1 mol L-1 ammonium acetate (pH 7.0) and 100g L-1 NaCl. The amount of NH+4 replaced by sodium the then determined by the steam distillation method. An exchangeable base concentration is resolved by atomic absorption spectrometry.


Heavy Metals

Analysis of the selected heavy metals (Hg, Cd, U, Pb, Cu, Ni) is conducted by ICP-OES after extraction with DTPA. Testing of heavy metal levels is conducted based on the permissible levels by the National environmental management (soil quality standards) regulations (2007) of Tanzania