Post by Oyewale Koffi

**🔍 Hydrogeophysical Survey | Ago Iwoye, OgunState** Another successful field investigation completed for Mrs. Adepeju Bernice Jaiyesimi at Ago Iwoye, Ogun State — this time fully executed by the Onyx Geoservices team. 📍 **Site**: Ago Iwoye, Ogun State 📊 **Method**: Vertical Electrical Sounding (Schlumberger configuration), integrated with water detector imaging 🕳️ **Depth Penetration**: ~100m 🎯 **Objective**: Borehole siting for a private water supply project **What the subsurface revealed:** The site sits squarely within the basement complex, with a relatively thin overburden of about 8±2m — topsoil giving way quickly to weathered basement, and then into fresh basement at depth. Basement stability here was assessed as stable, supporting a hanging well design. 📌 Expected yield: Fair 📌 Recommended drill depth: 120–150m 📌 Well design: Hanging Thin overburden sites like this remind us why VES remains indispensable before mobilizing a rig — it tells us not just how deep to go, but how the well should be built to hold up over time. Grateful to Mrs. Jaiyesimi for the trust, and to the Onyx Geoservices field team for another well-executed investigation. #Geophysics #Hydrogeology #VES #BoreholeDrilling #OnyxGeoservices #OgunState #FieldGeology #GroundwaterExploration