David L O'Brien



B.S.  Earth and Environmental Science  University of Pittsburgh, Bradford, PA

A.S.  Petroleum Engineering Technology University of Pittsburgh, Bradford, PA

Professional Experience: U.S. Geological Survey January, 2001 – Present

Hydrologic Technician 


Geraghty & Miller, Inc. March 1987 - January 1994

Staff Scientist

Participated in ground-water monitoring programs involving monitoring well installation, sampling and development. Extensive experience with hollow-stem auger, cable tool, air and mud-rotary drilling technologies. Conducted multiple aquifer pumping tests and utilized computer programs to model aquifer transmissivity. Well versed in unconsolidated soil, rock coring, ground water and free phase hydrocarbon sampling technologies. Managed ground-water projects, which included preparation of cost estimates and proposals. Coordinated field programs, as well as, budget tracking and report writing. Supervised and coordinated numerous programs involving the removal of underground storage tanks, the excavation of contaminated soils, and the completion of follow-up assessments.



Surtek, Inc. July 1983 – November 1986


Designed chemical systems to enhance the recovery of oil from petroleum reservoirs. Mastered permeability, porosity and sieve analyses, as well as, many wet chemistry techniques. Performed multiple linear and radial core floods, which simulated actual petroleum reservoir conditions utilizing specialized pumping, metering and pressure monitoring equipment. Operated field-pilot injection plants and monitored quality control of injected polymer solutions. Worked to develop new techniques for chemical enhancement of oil recovery from petroleum reservoirs. Assisted in report preparation using computer manipulation, from data collected. Responsible for the supervision of three chemical technicians and evaluated their work results to ensure their work processes had properly been completed. Purchased and maintained laboratory equipment.