ARCHIVED REPORTS_XR0011670 - Laserfiche WebLink

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The costs associated with this alternative are as follows: Risk Assessment $40, 000 Annual Monitoring _4 , 000 $44 , 000 Contingency (20%) 81800 Total $52, 800 8. 0 Recommendations Section 7 presented a summary of the potential remedial alterna- tives for the site. These remedial actions were reviewed and compared to determine the most feasible and cost effective alternative. Based on the known site characteristics, remedial action feasi- bilities, site geology and costs, WESTON recommends in-situ passive remediation for the site. This recommendation is based on the following information: o The BTX&E concentrations within the soil, as shown on Table 1, do not appear to be extremely significant. The risk assessment to be conducted as part of this remedial action will addresses the possible impacts of these compounds on the environment. o The area is asphalt covered which reduces the potential of infiltration and leaching of petroleum hydrocarbon from the soils to the groundwater significantly. o An ongoing groundwater remediation project at the site for Occidental Chemical Corporation is inducing a groundwater depression through the site. The potential for groundwater migration off the site is low. o The groundwater remediation project utilizes granularly activated carbon to remove fumigants from the groundwa- ter. Granularly activated carbon has proven to be effective for treatment of petroleum hydrocarbons. In summary, WESTON recommends that a risk assessment be conducted for the site to determine the potential impacts of the hydrocar- bon residues in the soil and the acceptability of passive soil remediation. Selection of remedial alternatives should be based on the results of risk assessment and cost effectiveness of remedial methodologies. 19 -