Diagnóstico geoambiental integrado em solo e água subterrânea em área industrial energética no município de Maracanaú - Ceará

Abstract

Industrial and urban growth observed in recent decades has intensified pressure on natural resources, especially on soil and groundwater, which act as important environmental reservoirs and strategic sources of supply. The methodology employed comprised the integrated execution of planialtimetric and geophysical surveys, boreholes, soil and water sampling, measurements of volatile organic compounds (VOCs), and infiltration tests, organized into sequential and complementary stages to ensure the reliability, accuracy, and representativeness of the data obtained. The results revealed the presence of a surface layer with high electrical conductivity down to approximately 12 m depth. Notably, between chainages 35 m and 75 m, a markedly conductive anomaly was identified, with resistivity values as low as 2 Ω·m, showing greater intensity near the 40 m mark. Electrical Imaging – Line 02 showed a surface layer with resistivities ranging from 100 to 300 Ω·m, overlying a highly conductive layer that extends across almost the entire investigated section, with greater intensity between chainages 40 m and 100 m. The average infiltration coefficient obtained was 25.58, indicating an intermediate hydraulic behavior of the soil. For the execution of these boreholes (inspection wells), 4-inch manual augers were used, reaching a final depth of 1.00 m. VOC measurements were carried out at depths of 0.00 m, 0.50 m, and 1.00 m using the equipment applied in the environmental diagnostic analysis (PhoCheck Tiger – PID gas detector). The water table was not reached in any of the inspection wells. Analytical results of soil samples collected at points E-01 to E-15, covering compounds from the BTEX group and Polycyclic Aromatic Hydrocarbons (PAHs), showed that, in general, all analyzed substances presented concentrations below their respective laboratory quantification limits, being reported as “<LQ”.