(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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P-all consultants Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 5.6 SURFACE WATER Hydrology Wetland Area The project could lead to changes in the hydrology of the Eastern Wayambo Swamp in the form of: • improving / accelerating drainage • blocking the fresh water flow from the southern swamps toward the mangrove zone by the construction of low E-W dams of clay and pegasse • increasing swamp water levels Such changes in the hydrology could have a moderate negative impact on the local ecosystems. Proposed mitigation measures are: • do not include construction of permanent dams or canals • limit the projected trails in size and extension, compared to the dimension of the Wayambo Swamp so they do not lead to increased blockage of water • the project activities are very temporary • level or interrupt dykes of clay, peat and vegetation debris along excavated trails With these measures adverse ecological effects from changes in hydrology in the Eastern Wayambo Swamp are therefore considered to be unlikely. The project’s impact to hydrology will then be minor negative at most. Table 25: Impact on hydrology Impact on: hydrology Without Mitigation With Mitigation Dryland Area Magnitude/ Intensity /Size Geographical scale Medium Small Long term Low Small Short term Duration Probability Severity Overall significance 74 High medium Moderate negative Medium Low Minor negative No impact of the project on the hydrology of the dry land study area is expected.
P-all consultants Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 5.7 WATER QUALITY Wetland Area Impacts of the project to water quality could be brought about by the following project activities: Construction phase: During the construction of trails and during equipment moving some turbidity may arise in the swamps and the fish holes. The increased level of suspended solids is considered to be a minor negative to negligible impact at most, being localized and short-lived; no mitigation is required. Operation phase: The on-site release of drilling waste of the explosion holes will change the water quality in the swamp surrounding the explosion holes. Turbidity caused by released mud may harm aquatic life, but salinity is not thought to be a factor given the very shallow explosion holes. The main impact being a temporary and much localized increase of turbidity. Therefore the impact of the on-site release of drilling waste in the environment is considered as to be minor negative. Mitigation will be to avoid releasing drilling waste into surface water. With this measure the impact will be negligible. Operation phase: Minor quantities of soil may be released from explosion holes during explosions. The impact, if any, will generally be very low, as it will affect only a very small area and it will be contained by the surrounding vegetation and peat. The impact is therefore considered negligible. Water quality measurements are conducted both in the swamp area and in the canal in the Dry land (Brantimakaweg) area to determine the water quality base-line. All phases: Solid and sanitary waste is being produced during all project phases. It could contribute to water pollution. The potential impact, being of low magnitude, low probability and very localized, is considered to be minor negative and will become negligible if Staatsolie General Field Instructions are implemented. Measures are already in place as part of the Staatsolie waste management procedures. 75
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(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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