Aggregates represent one of the main raw materials related to the construction activity. Of all the resources that aggregates represent, sand is one of the most important elements. In Buenos Aires province the extraction of this resource is done on Paraná River delta and over dunes of the Atlantic coast. Nevertheless, this process represents a deep impact on the associated ecosystem. One way to determine the impact level of certain activities is to use a bioindicator. The species Ctenomys talarum is a caviomorph rodent distributed on the coastal dunes of the Atlantic coast of Buenos Aires. The work was carried out on a sand quarry located near the Querandí lighthouse. In this study we realized a survey of the area to identify activity points of Ctenomys talarum. This sector was georeferenced and then recorded on digital maps, to determine the distribution pattern of the species. In all cases the distribution was mainly centered to the higher places of the exploited areas, corresponding with the borders of the studied sectors. The exception was the conservation area where the distribution showed the opposite pattern. This fact could be due to the effect of percolation of the superficial water which generates ponds, affecting the access of a burrowing animal, like Ctenomys talarum, to the impacted area.