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SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA <br /> TIER III RIsK BASED CORRECTIVE ACTION <br /> FEBRUARY 26, 1996 <br /> PAGE 1 - 2 <br /> and the environment This later objective is the primary goal for the Stockton Meat Packing <br /> Plant risk assessment <br /> Each Risk assessment involves five major steps <br /> • First, chemicals of interest (COIs) are identified among all of the chemicals that <br /> are known or suspected to be found in the soil and water This is done to focus <br /> the other portions of the risk assessment on those chemicals that have the greatest <br /> potential to threaten public health, the environment, and groundwater quality <br /> • Second, a risk assessment identifies how a person may contact a COI (this step is <br /> call the exposure pathway analysis) The potential for an individual to be exposed <br /> to a chemical is the result of the activities of the individual, the distribution of the <br /> chemical in the soil and groundwater, the conditions of the site (e g , the presence <br /> of a drinking water welI), and the fate and transport of the chemical through the <br /> environment When an individual is in contact with a chemical (e g , drinking <br /> water from a well that is screened within a groundwater plume) the exposure <br /> pathway is "complete " A "potentially complete" pathway is one that may not <br /> actual occur but can reasonable expect to exist if conditions change (e g , a <br /> chemical in groundwater can migrate from a source area to drinking water well) <br /> An "incomplete" pathway is a pathway that does not occur nor can reasonably be <br /> expected to occur (e g , inhalation of vapors from most metals is incomplete since <br /> metals are generally not volatile) Incomplete pathways are not evaluated <br /> quantitatively in a risk assessment <br /> • Third, for all complete or potentially complete exposure pathways, an individual's <br /> daily "dose" of a chemical is estimated This is involves estimating the average or <br /> representative concentration of the COI in the environment and characterizing the <br /> frequency and magnitude of an individual's contact with a chemical (e g , how <br /> many days per year an individual drinks water from an impacted well and much <br /> well water is consumed each day) <br /> • Fourth, the toxicity of each COI is identified Health end points of concern are <br /> either carcinogenic or noncarcmogenrc Both Federal and State regulatory <br /> agencies develop toxicity factors to be used in risk assessments Risk assessments <br /> are based on the theory that any exposure to a carcinogeruc chemical results in an <br /> 0131CDJ1 <br />