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A S S O C I A T E S I N C <br /> IF <br /> TPHd, TPH& BTEX, dissolved oxygen, ferrous iron, oxidation-reduction potential, carbon dioxide <br /> ' sulfate, nitrate, and total alkalinity. Following the collection of sufficient data, a reduction in <br /> monitoring parameters and/or frequency would be requested. When concentrations have decreased to <br /> background levels, a request for closure would be submitted. Upon, receipt of closure, the monitoring <br /> wells would be destroyed. <br /> ' 7_2 Alternative 2- Groundwater Extraction and Soil Excavation <br /> This alternative would include the continued extraction of impacted groundwater directly from the <br /> excavation. The groundwater would be pumped to a temporary storage tank on site and then <br /> ' transported off site to an appropriate recycling facility. If additional impacted soil is encountered, it <br /> would be excavated, stockpiled on site, characterized, and then transported off site at an appropriate <br /> ' landfill. The total volume of impacted groundwater is estimated to be less than 30,000 gallons and <br /> based on the results of previous soil remediation efforts, no additional impacted soil is anticipated. <br /> Confirmation samples of groundwater would be collected from the excavation following remediation. <br /> Samples would be analyzed for TPHd, TPHg, and BTEX. If concentrations have been reduced to <br /> acceptable levels, a request for closure would be submitted. If concentrations have not been <br /> sufficiently reduced then the need for further remediation would be evaluated. <br /> 8.0 REMEDIATION ALTERNATIVES EVALUATION <br /> ' Each of the alternatives presented above were evaluated according to the following criteria: <br /> ' 1. Level of protection of human health and the environment <br /> 2. Reduction of toxicity, mobility and volume of contaminants <br /> 3. Compliance with regulatory guidelines <br /> ' 4. Cost effectiveness/public benefit <br /> 5. Short term effectiveness <br /> 6. Long term effectiveness <br /> ' 7. Implementability <br /> 8. Regulatory and community acceptance <br /> ' 8_1 Alternative 1 -Passive Remediation with Groundwater Monitoring <br /> O Criterion 1: <br /> The passive remediation alternative has immediate health based risks. Construction activities <br /> are scheduled at the site so the possibility for exposure to humans by ingestion, inhalation, or <br /> dermal contact with impacted groundwater or soil is high. <br /> ,', <br /> O Criterion 2: <br /> w:1822541sun"Ld. 7 <br /> j�. <br />