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Supplemental Investigation Report,Problem Assessment Report and Work Plan <br /> Cleanu and Abatement Order No 5-00-707 EAI Pro ect No 1232 <br /> 6 3 2 Ground Water Remediation <br /> _P and Treat <br /> Pumping ground water follow by aboveground treatment has been proved to be an inefficient <br /> and expensive remediation method However, in some cases this technology can be efficient to <br /> contain contamination from further migrating However, since the RIW has been shutdown, <br /> containment is no Ionger an issue Therefore, pump and treat is not recommended for further <br /> evaluation at this time <br /> Vapor Extraction <br /> Vapor extraction has proved to be efficient for remediation of soil which possesses sufficient <br /> air permeability However, vapor extraction alone has not been efficient in remediation of <br /> impacted ground water Therefore, vapor extraction alone is not recommended for the further <br /> evaluation at this time <br /> Air S ar in a or Extraction <br /> Air sparging is a technology which introduces air into the ground water thereby agitating it and <br /> causing dissolved VOCs to evaporate in the air stream, resulting in VOCs being stripped from <br /> the ground water Additionally, air-sparging results in enhanced biodegradation of dissolved <br /> VOCs due to increasing the concentration of dissolved oxygen in ground water Sparging air <br /> enriched with VOCs is collected aboveground (extracted) and treated prior to being discharged <br /> to the atmosphere Air sparging coupled with vapor extraction has been implemented at the <br /> Wards site and is proving to be efficient in remediating the site The method is considered by <br /> EPA as a presumptive remedy and recommended for further evaluation This remedial measure <br /> is currently being used at the Wards site <br /> Blospaarg(n_ <br /> Biosparging is a technology similar to air sparging only with a low sparging airflow, therefore <br /> no extraction and consequently ex-situ treatment of the sparging air is required The <br /> technology is aimed to enhance aerobic biodegradation of dissolved petroleum hydrocarbons <br /> This alternative is recommended for evaluation <br /> BioslurpingZPual Phase Extraction <br /> This alternative is designed to increase the ground water extraction rate by applying negative <br /> pressure to an extraction well and at the same time to subject the soil in vadose and capillary <br /> fringe zones and cone of depression to the negative pressure which should promote <br /> volatilization and removal of petroleum constituents This alternative is not recommended for <br /> consideration for the same reason as a pump and treat alternative <br /> BS 1232P i1LW_WP -2 1- <br /> ENVIRONMENTAL AUDIT, INC <br />