The firm was established by David R. Hargis, PhD, RG, in 1979. With an initial client base of mining and energy-related companies, H+A soon became a recognized leader in dewatering, water supply, and water quality assessments. Recognizing a changing marketplace involving environmental regulations, H+A expanded its expertise in performing soil and groundwater investigations and contaminant characterizations, especially those associated with the Resource Conservation and Recovery Act (RCRA) and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) involving Superfund sites.
Engineering services were added in 1986 to complement H+A's hydrogeologic expertise including feasibility studies; design; treatability testing; permitting; construction management; operation and maintenance of groundwater and wastewater treatment systems. With an integrated approach from assessment to remedial action strategies, H+A offers innovative and cost-effective solutions for site restoration, remediation of groundwater and soil, development of water resources, and engineering services for mining operations.
Since its founding, H+A has developed special expertise involving hydrogeologic assessments, water resource development, groundwater modeling, contaminant characterization, and remediation of groundwater and soil that has been impacted by chlorinated solvents, pesticides, hydrocarbons, dense nonaqueous phase liquids, and metals. Dr. Hargis and other H+A principals are regularly called upon for expert witness testimony and technical consultation by clients, attorneys, and potentially responsible party groups (PRPs) concerning water quality assessments, water resource management, contaminate source evaluation, PRP identification, cost allocation, and cost recovery issues.