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 20 observation points as shown on Table 6 This final test stage data most accurately modeled how an effective full-scale combined system would operate The induced vacuum measured in the observation points and site specific data was input into the ' Vent-ROI model The model assumptions are included in Appendix G The results of the model indicated that a radius of influence of 18 feet could be expected from a full scale system at a flow rate of 148 5 inches of water at each extraction well Table 8 summarizes the Vent-ROI model results For comparison purposes, the drawdown data from the combined groundwater extraction and HVE test at EW-1 was analyzed by the GWAP program (Appendix G) The calculated aquifer parameter values (Table 9), as compared to typical aquifer test results (Table 5), appear to be generally within an order-of-magnitude The combined test results do indicate an improved pumping well efficiency ' resulting in an increased rate of groundwater extraction It is expected that the resultant capture zones from a combined groundwater and high vacuum extraction system would be larger than the capture zone produced by groundwater extraction only 53 High Vacuum Dual Phase Extraction Test A High Vacuum Dual Phase Extraction (HVDPE) test was performed to meet the following objectives ' Quantify aquifer and vadose zone response onse to HVDPE p • Provide data to evaluate the feasibility of HVDPE as a stand-alone remedial technology for the site, and • Develop a model of HVDPE response for implementation of a full-scale remediation system 5 3 1 Methodology The HVDPE test was designed to extract the groundwater and extract sod vapor from the vadose ' zone using a liquid-ring pump as a stand alone system (i e , no submersible groundwater pump was used) Sod vapor and groundwater was withdrawn from the extraction well at a known vacuum and the resultant vapor and water flow rate was recorded Incremental increases in the vapor flow rate were made at the extraction well and the vacuum response induced in the subsurface was measured 2819RO34 070 GROUNDWATER TECHNOLOGY, INC