Laserfiche WebLink
i <br /> o Criterion 6 <br /> The long term effectiveness would be considerable if the entire area of impacted soil <br /> f 1 is removed from the site, preventing any possibility of further contamination of <br /> groundwater <br /> a Criterion 7 <br /> 1 <br /> I <br /> This alternative would have implementability difficulties due to the proximity of <br /> impacted soil to utilities and the nearby street which is heavily travelled by local and <br /> through traffic <br /> � 1 <br /> a Criterion S <br /> ' The immediate impact to the nearby community would be extensive Negative <br /> impacts would include noise, traffic congestion, dust, and volatilization of the <br /> ' contaminants These inconveniences may hinder community acceptance of this <br /> i <br /> alternative In addition, it may be difficult to obtain encroachment permits from <br /> local agencies for such a large excavation <br /> ' 3.3.3 Alternative 3 - Soil Vapor Extraction with Groundwater Monitoring <br /> a Criterion 1 <br /> This alternative has minimal health-based risks Gasoline hydrocarbons are removed <br /> from extracted vapor prior to release to the atmosphere eliminating the risk of <br /> exposure to humans Groundwater would be monitored periodically to ensure that <br /> 4 continuing degradation of existing or potential beneficial uses is declining Potential <br /> fire or explosion hazard exists due to the relatively high levels of documented <br /> residual hydrocarbons, but this would be significantly reduced with a properly <br /> designed system and regularly scheduled monitoring and maintenance <br /> a Criterion 2 <br /> Vapor extraction should reduce the level of toxicity, mobility and volume of <br /> ' contaminants in the soil to levels acceptable to regulatorya Essentials <br /> agencies g Y <br /> complete reduction of toxicity and volume of contaminants would occur via the <br /> oxidation of the hydrocarbons in the thermal oxidizer/catalytic oxidizer unit Pilot <br /> testing indicates vapor extraction to be a feasible alternative for remediation of the <br /> site <br /> t <br /> o Criterion 3 <br /> This alternative can be implemented within regulatory guidelines <br /> E <br /> l <br /> ground7x1rOLk1Cap :5 <br /> I <br /> L I <br />