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7.3 Alternative 3 - Soil Vapor Extraction with Groundwater Monitorin This alternative involves remediation of impacted soils by vapor extraction with continued ' groundwater monitoring Initiation of a soil vapor extraction system would include the following activities preparing plans and specifications, obtaining necessary permits, and installing the ' vapor extraction piping, treatment compound, and off-gas treatment device (catalytic oxidizer or granular activated carbon) The vapor extraction system would be monitored at least monthly ' or at the frequency specified by the San Joaquin Valley Unified Air Pollution Control District (APCD) Groundwater monitoring would continue on a regular basis until it is determined that groundwater has not been impacted and the potential for groundwater impaction is limited 8.0 REMEDIATION ALTERNATIVES EVALUATION Each of the alternatives presented above were evaluated according to the following criteria I Level of protection of human health and the environment 2 Reduction of toxicity, mobility and volume of contaminants 3 Compliance with regulatory guidelines 4 Cost effectiveness/public benefit 5 Short term effectiveness 6 Long term effectiveness 7 Implementability 8 Regulatory and community acceptance 8.1 Alternative 1 - Passive Remediation O Criterion 1 The passive remediation alternative has no immediate health based risks The site is rsecured to preclude public access so the possibility for exposure to humans by volatilization, dust or dermal contact with impacted soil is minimal, with little or no fire ' or explosion hazard The shallowest aquifer is located approximately 25 feet below the depth of impacted soil so the risk of impacting groundwater exists This aquifer is ' currently classified as a drinking water source but is not generally used as such 1500471REPORTs\CAF 0694 FNL 10