Since 1992, Earth Systems has provided On-Call Soils and Materials Testing Services to the County of San Luis Obispo, as well as on an individual project basis. Services have ranged from full service soils engineering reports followed by soils and materials testing and inspection to projects requiring only one visit for material sampling and testing.

A few recent projects for the County include:

Earth Systems has provided geotechnical engineering reports and materials testing/inspection for numerous roads and bridges, including 2009, 2010, 2011, and 2012 asphalt overlay projects involving several County roads, the Price Canyon Road Widening-Edna Overhead Bridge project, the San Simeon Creek Road Bridges 1 and 2, and the Vista Del Rio Road Repair.