Former Marine Corps Air Station

Ninyo & Moore conducted step and constant rate drawdown tests within the shallow and deep aquifers of two areas of a Marine Corps Air Station. The pumping wells and a network of over 30 piezometers were monitored for drawdown before during and after the pumping tests using manual electric water level indicators and programmable downwell pressure transducers. The wells were monitored for one week prior to and following the tests to evaluate barometric changes in the water levels as well as the effect of rainfall events. Water levels were collected at hourly intervals before and after the tests and the pumping wells, and monitoring wells were monitored at one minute intervals during the tests. The aquifer tests were conducted to evaluate the hydraulic properties of the aquifers including hydraulic conductivity and transmissivity, well yield, radius of influence, and the geometry of the cones of depression formed during pumping. The information developed during the tests was used to evaluate capture zones for preparation of a remedial action plan and the design and location of recovery wells to be used in the remediation and containment of the groundwater contamination plumes.