ARCHIVED REPORTS_XR0002815 - Laserfiche WebLink

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t� 1 A S S O C I A T E S 1 N C ♦ Criterion 4 ' The soil vapor extraction and groundwater extraction and treatment remediation alternative would require the installation of three vapor extraction wells, one groundwater extraction well, and the abatement equipment A pilot test would be conducted to determine the ' effectiveness of this remedial option If the pilot test indicates this remedial option is feasible, vapor-phase carbon would likely be used for treatment of off-gases and liquid- phase carbon would likely be used for treatment of extracted groundwater It may be necessary to initially utilize another off-gas abatement method, which would require considerable capital outlay Additional costs to the client would be incurred for permitting, ' leasing, and installing the vapor extraction equipment and treatment compound, and operation and maintenance of the system The cost of this alternative is estimated to be between$200,000 and $350,000 ♦ Criterion 5 This alternative should effectively remediate subsurface contaminants to acceptable ' regulatory levels within 2 to 3 years of implementation so the short term effectiveness is poor for this alternative Exposure to humans by contamination releases to the air due to dust, or through ingestion or dermal exposure to impacted soil or groundwater is minimal during groundwater monitoring and well destruction activities but is otherwise nonexistent for this alternative so short term effectiveness is not a factor ' ♦ Criterion 6 The long term effectiveness for soil remediation would be fair to good depending upon the 1 degree of contaminant removal TPHg and BTEX constituents would be removed at a quicker rate than TPHd Groundwater would be monitored periodically until soil and groundwater is remediated to ensure that petroleum hydrocarbons are biodegrading ' ♦ Criterion 7 This alternative has some minor implementabilrty problems due to the necessity of a pilot ' test and the time involved in obtaining permits from the APCD for the vapor extraction system Permitting could take as much as 180 days depending upon APCD work load, but is typically completed in 60 to 90 days ♦ Criterion 8 Impact to the businesses during installation and other site activities will be moderate This ' method has been shown to be effective in similar soil types and regulatory acceptance is expected ' 6.0 RECOMMENDATIONS Based on the soil and groundwater data compiled and included in this technical report, ATC Associates recommends soil excavation and groundwater remediation The proposed scope of w 1625001repoM\CAP doe 9 I