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RISK ASSESSMENT Site The greatest risk ass�)ciated with the site, with the entire project, is d threat to groundwater if a remediation project is not the continue initiated. threarbon vapors were detected to a depth of 34 feet below grade at temporary vapor probes installed for the remedial investigation, At th of the time of the oin5 stfeetiobelowougdwater rade. waAlthoughedaatgroandwater approximately og to be initiated, and even if the groundwater at remediation program is the site is fully remediated, hydrocarbons that remain in the soil may migrate down to groundwater level with the passage of osoiltime, during i � groundwater may come in contact with hydrocarbon-imp' periods of higher water table level, i .e., during the winter months of e normal rainfall year. ti�eSQf�re, The currenminate tis portant to drought status�provides tan hydrocarbon source excellent opportunity to achieve remediation with minimal threat to the groundwater. In-Situ Vapor Extraction Soil Remediation System The greatest risks associated with ehui mentdiduroingemeatinasystemtunderground risks associated with use of heavy q p installation procedures. However, since the project site is a vacant lot, public contact with the site should be minimal. Additional perceived risks associated with this technology are emissions of air pollutants and noise. Since the air emission levels will be regulated by e levels emitted will not be a threat to public county agencies, thes health. There will be noiseno cgenerated duringlled ssystemiloperation provean technology. Should the 9 annoyance, the system equipment or equipment layout can be modified. The There are nooject otherdlrmitationsation using ssociatedextr withcusenofsth6to is technology12 .There ar Soil Excavation and Disposal This remediation alternative has the greatest risks associated with it. There are major hazards to the public and field technicians associated with excavation of large quantities of soil: use of heavyequipment, danger of the sidewalls of the excavation pit collapsing, large quantities of soil, and the open pit resulting from the excavation. - Although public contact with the project site will be minimal and chain cavated area, the danger remains until the link fencing will secure the ex prcject is completed, ardsthe associatedd with ithisbackfilled alternativecoilnclude: The environmental haze _ uncontrolled vapor releases from the exposed soil to the environmen am the possibility that not all of the hydrocarbon impacted soil is removed. - 9 - A;