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A <br /> 1 <br /> A S S O C I A T E S I N C <br /> how to limit certain activities on site if risk is found Otherwise, engineering controls could <br /> be put in place to control or reduce the contaminants <br /> ' ♦ Criterion 7 <br /> Of all the alternatives this approach is the easiest to implement It involves computer <br /> ' modeling utilizing RBCA Tier I software (version 1 01) developed by Groundwater <br /> Services, Inc (GSI) and runs in MS Excel Results would be evaluated and summarized <br /> in a report <br /> ♦ Criterion 8 <br /> ' Since minimal activity would be conducted at the site, the impact on the community would <br /> be very minor and not disruptive to the businesses located on the site and nearby The <br /> results are generally accepted by state regulatory agencies if the risk to human health and <br /> 1 the environment is shown to be low <br /> 5.2 Soil Excavation and Groundwater Remediation <br /> ♦ Criterion 1 <br /> This alternative significantly increases the exposure of humans through volatilization of the <br /> contaminants and inhalation of and dermal exposure to dust and vapors created during <br /> excavation activities The potential fire or explosion hazard should be minimal due to the <br /> relatively low levels of documented residual hydrocarbons <br /> ' ♦ Criterion 2 <br /> This alternative would not reduce the concentration of contaminants in the soil unless <br /> aeration of impacted soils is conducted on site or occurs during transport and landfilling <br /> activities Soil excavation would effectively eliminate the contaminants in the soil and <br /> ' would eliminate additional impacts on groundwater at the site by removing the secondary <br /> source of contamination Groundwater would seep into the pit during the soil excavation <br /> The groundwater would be pumped into vacuum trucks and recycled at an appropriate <br /> ' facility This would reduce the quantity of petroleum hydrocarbons in groundwater <br /> ♦ Criterion 3 <br /> ' This alternative can be implemented within regulatory guidelines <br /> ♦ Criterion 4 <br /> ' Costs associated with this alternative include properly abandoning two groundwater <br /> monitoring wells, treating the soil on site or disposal of contaminated soil to an appropriate <br /> landfill, pumping and disposing of the groundwater from the pit, backfilling the excavation <br /> ' with clean material, installing two new groundwater monitoring wells, and post remedial <br /> monitoring The cost of this remediation alternative is estimated to be between$50,000 and <br /> $100,000 <br /> w 1625001reportslCAP doc 7 <br /> 1 <br />