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Table 6:Technology Screening ceosyntee Consultants Rough and Ready Island,Site 47 Port of Stockton Effectiveness and Permanence Implementability Overall Protection of Human Health Compliance with Reduction of Toxicity,Mobility,or Screening Technology Description of Technology and the Environment ARARs Volume Through Treatment Relative Cost Outcome g Short-Term Long-Term Advantages Disadvantages Containment Protective Install a cover on top of 1)Protective of human health,as it Compliant with chemical 1)No reduction in the toxicity, 1)Protection of community and workers to 1)Demonstrated effectiveness in isolating COCs/COECs 1)Proven technology that is 1)Wide distribution of COCs/COECs Cover COC/COEC impacted soil. minimizes exposure through direct specific,action-specific, mobility,or volume of COCs/COECs be implemented via health and safety from potential receptors resulting in a reduction of residual readily implemented using in Site 47 soils will likely require large Cover design is assumed to be contact with COCs/COECs in soil, and location-specific through treatment. controls during treatment. risk. standard equipment and vendors. cover areas. a demarcation layer and two although COCs/COECs will remain in- ARARs. 2)RAOs will be met following placement 2)Requires maintenance and monitoring of the cap to 2)Minimal disturbance to 2)Requires grading permit and may Retained feet of clean cover fill. place at Site 47. of the cover. maintain protectiveness. COC/COEC-impacted soil during require skilled labor(e.g.,strict for further 2)Protective of the environment as it 3)Requires land use restrictions and soil management plan installation. construction QA/QC)for installation, evaluation in minimizes exposure of ecological for long-term effectiveness and permanence. 3)Easy to monitor and maintain depending on selected design. Moderate combination receptors to COCs/COECs. through periodic inspections. with other remedial technologies. Treatment hi-Situ Stabilization agent(e.g.,6% 1)Protective for metals in soil through Compliant with chemical 1)Some reduction in toxicity due to 1)Protection of community and workers to 1)Effective for metals,but ineffective for PAHs and total 1)Proven,mature technology that 1)Wide distribution of COCs/COECs Stabilization quicklime solution,zero immobilization. specific,action-specific, stabilization of metals.As a result the be implemented via health and safety DDT. can be implemented using in Site 47 soils will require large soil valent iron,apatite,or 2)Not protective for PAHs or total and location-specific effective volume of metal controls during treatment. 2)May result in a decrease in soil permeability over time. standard equipment and vendors. blending footprint. MetaEix®)blended with the DDT in soil. ARARs. COCs/COECs is also reduced. 2)RAOs may not be met with respect to 3)Changes in groundwater level or geochemical conditions 2)Natural geochemical 2)Bench and pilot tests necessary for High due to soil soil resulting in the 3)Potential impact to human health 2)Reduction of metal COC/COEC PAHs and total DDT in soils. could result in leaching of immobilized contaminants from conditions may already align with design. blending cost Not Retained conversion of aqueous heavy during the soil blending process. mobility via incorporation or stabilized mass. those needed to maintain 3)Post-implementation sampling and necessity due to high cost metals to low solubility 4)Not protective of ecological receptors encapsulation in low-solubility mineral 4)Requires land use restrictions and soil management plan stabilization of metals. necessary to confirm treatment for long-term and mineral precipitates. as some COECs(i.e.,PAHs and total precipitates. to minimize disturbance of stabilized areas. 3)6%quicklime solution effectiveness and chemical stability of reapplications ineffectiveness DDT)remain in-place at Site 47. 3)Unlikely to reduce mobility or successfully used to immobilize selected remedy. of reagent to for PAHs and volume of PAHs or total DDT. arsenic and stabilize soils beneath 4)Periodic monitoring required to sustain metals total DDT. 4)The treatment is irreversible to the McCloy Avenue in 2007. confirm long-term stability,may immobilization. extent metals stabilization is additionally identify the need for maintained. reapplication of stabilization reagent. In-Situ PAHs and total DDT degrade 1)Maybe protective if PAHs can be Compliant with chemical 1)Reduction in volume of PAH and 1)Protection of community and workers to 1)Effectiveness for soils impacted by PAHs,VOCs,PCBs 1)Technology can be 1)hmnature technology:effectiveness Chemical via oxidation.The oxidant destroyed through treatment(requires specific,action-specific, total DDT through irreversible be implemented via health and safety and pesticides would need to be verified through bench and implemented using standard for PAHs and total DDT under site- Oxidation (presumed to be a liquid bench and pilot tests). and location-specific destruction(requires bench and pilot controls during treatment. pilot tests. equipment and vendors. specific geochemical conditions not solution and/or slurry of 2)Potential impact to human health due ARARs. tests). 2)Potential off-gases generated during 2)Ineffective for metals. certain. Not Retained permanganate or peroxide)is to off-gases generated during operation 2)No reduction of toxicity,mobility,or operation will require treatment. 2)Wide distribution of COCs/COECs due to high cost, delivered via temporary (requires treatment). volume of metals at the Site. 3)RAOs may not be met with respect to in Site 47 soils will require large High due to uncertain injection points to achieve 3)Not protective of ecological receptors metals in soils. implementation footprint. large effectiveness for sufficient coverage across as some COECs(i.e.,metals)remain in- 3)Bench and pilot tests necessary for implementation PAHs and total contaminated areas of Site 47. place at the Site. design. footprint. DDT,and 4)Health and safety concerns ineffectiveness (compressed oxidants). for metals. 5)Post-implementation sampling necessary to confirm treatment effectiveness. Vitrification Stabilization agent blended 1)May be protective if PAHs,total Compliant with chemical 1)Potential reduction of PAH and total 1)Protection of community and workers to 1)Effectiveness at isolating metals via immobilization in 1)Technology can be 1)Wide distribution of COCs/COECs with soil,and thermal DDT,and metals can be destroyed or specific,action-specific, DDT volume through irreversible be implemented via health and safety the vitrified matrix would need to be verified through bench implemented using standard in Site 47 soils will require large treatment applied,resulting in immobilized through treatment and location-specific thermal degradation(requires bench controls during treatment. and pilot tests. equipment. implementation footprint. the destruction of organic (requires bench and pilot tests). ARARs. and pilot tests). 2)Potential off-gases generated during 2)Effectiveness at reducing organic COCs/COECs would 2)Requires extensive pilot testing and COCs/COECs and the 2)Potential reduction of metal mobility operation will require treatment. need to be verified through bench and pilot tests. infrastructure(i.e.,installation of immobilization of inorganic and toxicity via 3)Change in groundwater level or geochemical conditions heating elements,electrical source). High due to COCs/COECs in a vitrified incorporation/encapsulation in vitrified could result in leaching of immobilized contaminants from 3 Immature technology:limited large g ) implementation Not Retained (glassy)matrix. matrix(requires bench and pilot tests). vitrified mass. commercial availability and due to high cost 4 Requires land use restrictions and soil management plan effectiveness under site-specific footprint and ) q g p p infrastructure to and uncertain to minimize disturbance of vitrified areas. geochemical conditions not certain. effectiveness. 4)Requires significant protective implement measures to mitigate potential off-gases remedy. generated during the thermal treatment stage. 5)Post-implementation sampling necessary to confirm effectiveness. Page 2 of 3