ARCHIVED REPORTS XR0009470 - Laserfiche WebLink

Home Browse Search

r Evaluation of Best Available Technology for Fiemediation of Hydrocarbon Impacted Soil and Groundwater 3 Manna Pro, 4004 EI Dorado Street, Stockton, CA November 22, 1994 1 remediation operations because groundwater may be pulled upward into the vadose zone thus ' blocking the effects of the soil venting process During the High Vacuum System Vapor Extraction pilot test, the upwelling groundwater reduced the soil venting influence upon the vadose zone ' 26 High Vacuum Extraction Combined with Groundwater Pumping This technology is field proven and was pilot tested at the Manna Pro site This combined ' technology can remove high volumes of soil vapors and maintain groundwater control Groundwater control is important In order to maintain a capture zone which effectively traps the ' plume and extracts the impacted groundwater for treatment and discharge Groundwater extraction is also useful In eliminating the upwelling of groundwater due to the high vacuum which can disrupt the effectiveness of the soil vapor extraction operation This system offers improved venting and improved groundwater extraction rates 27 Bioremediation ' Bioremediation can be relatively quick and cost effective when applied correctly However, bioremediation was not considered feasible for this site, at this time Ex situ biodegradation is not feasible due to the high excavation costs mentioned earlier In situ biodegradation with nutrient amendments is not cost effective due to the clay layers which will make the nutrient delivery process ' difficult It is worth noting that under the approach chosen for the site there will be a certain degree of bioremediation occurring within the impacted zones due to the Increase In oxygen below the subsurface due to the soil vapor extraction process Respirometry will be monitored during the ' remediation process to evaluate microbial activity/bioremed ial potential ' 3 0 SELECTION OF TECHNOLOGY High vacuum extraction combined with groundwater extraction was determined to be the most feasible and cost effective remediation technology for the Manna Pro site conditions Based on the pilot test results, the high vacuum extraction technology should serve to increase the efficiency of the groundwater extraction wells thereby providing higher groundwater extraction flowrates This ' method will offer the maximum influence from both groundwater pumping and high vacuum sod vapor extraction These technologies are also best suited to the subsurface conditions of clay layers with a combined soil and groundwater problem requiring attention r ' 0096R014 202 GROUNDWATER LFIL TECHNOLOGY, INC 1