Laserfiche WebLink
-a -ME <br /> tom* <br /> Criterion 9: <br /> The three alternatives are all comparable in terms of impacts upon <br /> water conservation. <br /> Based on the nine criteria discussed above, soil remediation using <br /> vapor extraction is the proposed remediation alternative at the site. <br /> V ile excavation approaches will, be effective in mitigating the <br /> ,impacts of hydrocarbon impacted soils, the vapor extraction approach <br /> t•, is capable of removing hydrocarbons that may have migrated beneath <br /> the sidewalk on the east side of the property. Excavation would not <br /> be feasible in this area due to the roadway. The most important <br /> factors in selecting vapor extraction in lieu of a sail removal <br /> approach are as follows: <br /> a. The geological setting at the site is favorable for vapor <br /> extraction and this approach is significantly more cost <br /> effective. <br /> b. Soil removal results in the release of more hydrocarbons to <br /> the environment due to the process of excavationand <br /> stockpiling. During this process it is impossible to <br /> prevent the natural volatilization of the gasoline <br /> constituents. Additionally, these constituents may be <br /> dispersed by wind, or precipitation. <br /> c. The soil excavation approaches are significantly more <br /> difficult to implement since additional measures are <br /> f.. required to protect structures on the site including the <br /> ! ' roadways, sidewalks and channel bulkheads. The excavation <br /> will also result in more business disruption, more traffic <br /> in the area and the production of a significant quantity of <br /> ` waste asphalt, concrete and other materials which would <br /> .. require disposal. <br /> d. Vapor extraction will result in controlled destruction of <br /> the hydrocarbon constituents with lesser release to the <br /> environment. <br /> .v, <br /> 6.0 PROPOSED SOIL REMEDIAL ACTION PLAN <br /> t The objective of the remediation-_prograZ-i3-_to_13wer-the-levels--of - - -- --- ---- <br /> '~ gasoline hydrocarbons in soils at the site to levels acceptable for <br /> closure by the overseeing regulatory agencies. The, results' of the <br /> vapor extraction test and the site specific hyd.rogeologic.. data <br /> Weber Point PrcParty - 475 <br />