The possible archaeological sites investigated in the route of the gas pipeline have been the following:
. Los Llanos I and II: The alterations detected in the terrain seem to correspond to traces of vine cultivation that are distributed in a regular way creating a grid. The lithic materials recovered during the clearing and cleaning phases come from the surface level, and the existence of a primary deposit at deeper levels can be ruled out.
. The Quemadero: Both the clearing process and the geological surveys have not found materials, structures or levels of archaeological interest, only observing levels of current anthropic fillings with no patrimonial interest.
. Roman Villa of Villaverde: In the two soundings carried out up to the level set by the site (-1,40 meters), it was only possible to verify the persistence in depth of levels of recent fillings. Therefore, the execution of an exhaustive archaeological control of the earthworks to be carried out in the area is pending.
. Tío Blas Ventorro sandboxes: In the clearing process and during the geological surveys, only levels of current anthropic fillings with no heritage interest were detected. The only element of interest is the isolated finding and within the aforementioned levels of contemporary fillings (level - 0,30 meters) of a double-sided carved in gray flint with a clear chronological ascription to the Ancient Paleolithic (Lower / Middle Palaeolithic).
During the archaeological monitoring and control phase of earthworks (opening of the track and ditch), two archaeological sites were detected:
. Field M-301 Casa Blanca (II): The archaeological excavation carried out in the area of the fertile plain of the Manzanares river, in the Madrid district of Villaverde and along the A-4 highway at the height of Pk 8 + 400, has allowed to document a series of underground archaeological structures, circular pit type, associated with the neighboring site of “La Casa Blanca”, with a chronology between the end of the Bronze Age and the beginning of the First Iron Age. A total of 8 structures have been excavated in two groups. In the first, three structures have been documented, all of them with the same characteristics, circular pits of the silo type. Its fillings have provided ceramic materials that at first glance would be located at a time in the late Bronze Age or First Iron Age. The characteristics of the materials and the proximity of the graves to the aforementioned La Casa Blanca site, suggests that it could be a peripheral area of it.