Palmerton & Parrish, Inc. (PPI) is a Consulting Engineering Firm that specializes in Geotechnical Engineering, Subsurface Dri ... lling, Construction Materials Testing, and Environmental Services. PPI provides quality, well-rounded service to our Clients with a responsive professional staff; well-trained drilling, field technician, and laboratory technician staff; and an extensive array of construction materials testing and subsurface drilling equipment. PPI was founded in Springfield, Missouri in 1989, and is headquartered there today. PPI maintains a constant staffing level of more than 50 full-time employees, who work out of our Springfield, Missouri headquarters and branch offices in Branson, Missouri, Joplin, Missouri, and Tulsa, Oklahoma. PPI is recognized as a local and regional leader in areas such as subsurface investigations, foundation design, site development, sinkhole and mine feature remediation, geotechnical and environmental drilling, and construction materials testing. read more