Our Team Joel D. Plumley, P.E. Founder and President of Plumley Engineering, P.C. View Bio Dale R. Vollmer, P.E. Managing Engineer – Environmental Department View Bio Frank A. Karboski, P.G. Senior Geologist and Manager of Geoscience Field Operations View Bio Julian F. Clark, P.E. Managing Engineer – Civil Department William J. Spizuoco, PE Senior Engineer - Environmental Department View Bio David K. Meixell, P.E. Senior Engineer – Environmental Department View Bio Jesse D. Plumley, P.E. Project Engineer View Bio Geoffrey A. Hillenbrand, E.I.T. Staff Engineer View Bio Jay J. Lee View Bio Matthew T. Martin GIS Manager / Senior Environmental Scientist View Bio Derk T. Hudson Geologist View Bio Lynne A. Hamilton-Johnson, MBA Comptroller View Bio Christine A. Sykes Office Manager / Senior Administrator / Technical Writer View Bio Carrie E. Price Administrative Assistant / Assistant Technician Want to work with us? Schedule A Consultation