JACA & SIERRA TESTING LABORATORIES, INC.  is soil and material testing laboratory and geotechnical consulting firm based on the island of Puerto Rico.  The corporation was established in 1967 by Engineers Carlos R. Sierra Silva and Luis Jaca Mendez.  Our services cover the island of Puerto Rico, Virgin Islands (USVI and BVI ), lesser Antilles and other locations within the Caribbean.  Our engineering materials testing laboratory has been accredited by AASHTO Accreditation Program (AAP) for certain quality standards and various common concrete, aggregates and soil testing standards. Our laboratory is also US Army Corps of Engineers validated.  Follow links through our web site to gain more insight into our services and capabilities. Contact our team of  highly motivated and experienced engineers, for your projects' geotechnical and construction material testing needs.