ARCHIVED REPORTS XR0009475 - Laserfiche WebLink

Home Browse Search

Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 Manna Pro, 4004 South EI Dorado, Stockton, CA 19 Vent-ROI uses vacuum/flow response and vacuum dissipation data recorded during the vapor extraction test to prepare an analytical model of flow in the subsurface in response to an applied vacuum A wide range of operating variables may be adjusted to design a cost effective system The adjustable variables considered by Vent-ROI include ' - Contaminant type, • Well depth, • Screen intervals, • Temperature, • Applied vacuum, 1 Air flow rate, • Clean-up time, and • Clean-up goals By adjusting the variables, it is possible to determine well spacing and blower sizing specifications for the final system design During the first three stages of the combined groundwater pumping and HVE test, groundwater flow ' was held constant at 1 3 gpm As the vacuum was increased at the wellhead, the water level in the extraction well was pulled above the screen, effectively blocking the flow of air in the vadose zone This phenomenon was measured using a water-level probe, and confirmed by the drop in vacuum response in the observation points with increased applied vacuum Therefore, to utilize Vent-ROI, the data collected during the final test stage, which involved maximizing groundwater extraction and HVE, was input into the computer model During this stage, the water level drawdown in the extraction well allowed vacuum influence to be transmitted to the observation points During the final test stage, the groundwater pumping rate was increased to 3 75 gpm With the applied vacuum to the well, this flow rate was able to be maintained The groundwater level was depressed below the screen and a significant increase in vacuum response was observed in the 2819R034 070 LIEN GROUNDWATER TECHNOLOGY, INC