Excavaciones Rebolledo is a groundworks contractor based in Agost, in Alicante province. Its Google Business Profile lists it as “Excavating contractor”.
It has a Google rating of 4.0 from 1 review. That is too few reviews to say much yet, so ask for references.
If you want comparison quotes, the nearest other groundworks contractors are Jose Savall Ronda in San Vicente del Raspeig (5 km), Excavaciones Brialve in Santa Pola (6 km), Excavaciones Lucentum in San Vicente del Raspeig (6 km). Getting two or three quotes is normal for this kind of work.