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 22 ' 533 Results The field data measured during the HVDPE test is provided in Appendix H and summarized on Table 10 The fourth stage of the data collected during the HVDPE pilot test is summarized on Table 11 The intake of the drop tube was held at 36 to 38 feet below grade and the applied vacuum was increased in three stages During the fourth stage of the HVDPE pilot test, the drop tube (Intake) was lowered to the bottom of the well with full applied vacuum IDrawdown during the HVDPE test, as recorded by the data logger, is presented in Appendix H The data are presented showing date, elapsed time, and drawdown where each probe was located Table 11 identifies the wells that were monitored, and presents the maximum drawdown experienced at each well during fourth stage of the HVDPE test After 340 minutes of pumping, maximum drawdown was greatest in wells 013-1 and 013-2, located 9 5 feet and 13 feet, respectively from the pumping well 5 3 4 Data Analysis The low vacuum stage resulted in a groundwater flow rate of 0 15 gpm and vacuum extraction of 13 standard cubic feet per minute (scfm) Vacuum influence in adjacent wells was minimal due to the low induced vacuum Subsequent increases in the vacuum rates (stages 2 and 3) resulted in an increase in groundwater pumping rates, however vacuum influence in adjacent observation points remained relatively constant Monitoring data indicates that the vacuum increase was expended primarily to pump water from the extraction well The water level was depressed to the end of the drop tube and air was extracted from the vadose zone The field vacuum influence data recorded from the observation points fluctuated throughout the test The data was not conducive for use in the Vent-ROI model From the vacuum induced in the adjacent wells and past Groundwater Technology experience, a sod vapor extraction radius of influence of 5 to 10 feet is expected Typically, a radius of less than 10 feet is not economical and other treatment technologies are recommended ' During the last stage of the HVDPE test, the drop tube (intake) was lowered slowly to the bottom of the well Groundwater was extracted from the well and lifted up to 53 feet from below grade using ' 2819R034 070 LIM GROUNDWATER ' TECHNOLOGY,INC