ARCHIVED REPORTS XR0000869 - Laserfiche WebLink

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' 4) direct ingestion of groundwater 5) ingestion of milk, meats, eggs, frits and vegetables grown on site that have bio-accumulated the contaminants 6) absorption through the skin by contact with soil particles 7) absorption through the skin by contact with groundwater 8) absorption through the skin by contact with surface water 1) Inhalation of vapors from the soil is a possible exposure pathway. Given the depth of contamination and limited area of surface soil contamination there is not expected to be a large ' amount of soil vapors making it to the surface 2).Inhalation and skin exposure of dust indoors and outdoors is not a concern because the bottom of the tanks were 6'deep The top 5' of soil was not exposed to contamination Also soils exposed to the air(top 5 foot)are provided with oxygen and ' rain water for bacterial metabolization of the contaminants Dust associated with this site is inert 3) Direct ingestion of soil particles would only be a threat if the particles came from 5 foot or deeper and were immediately consumed before natural attenuation could take place. Most people ' wouldn't ever see this type of exposure,only operators and grade checkers for basement excavation of a new building would see this type of exposure 4) Direct ingestion of ground water could only take place if a well was installed within the influence of this site. Since it is the City of Stockton's ' policy to have everyone within 200' of a municipal water line to be hooked up, it is extremely unlikely that an individual will ever install a domestic well within the influence of this site. The ' existing municipal well is 2,500'up gradient and is not threatened by this site 5) Ingestion of milk, meats, eggs, fruits and vegetables grown on site that have bio-accumulated the contaminants is limited to only fruits and vegetables This property is zoned commercial and is not expected to ever ' have farm animals okro)v crops,but there is the possibility of a vegetable garden The top 5'of soil was not exposed to contamination which will negate the risk to the root zone 6) Absorption through the skin by contact with soil particles would only threaten those who were actively digging below 5 feet and should not be considered a threat 7) Absorption through the skin by contact with groundwater should not be considered a threat to humans because of the extremely unlikelihood of a well being placed within the influence area of this site 8) Absorption through the skin by contact with surface water is not a threat to humans because there is not any surface water within the influence area of this site In order to enumerate the risk attributable to the Vogue Cleaners site a risk assessment was performed using an Excel Spreadsheet produced by Berkeley National Laboratory called CaITOX CaITOX is a multimedia total exposure model using macros in Microsoft's Excel spreadsheet program, Exhibit H CaITOX Version 4 0(Beta)was used A cancer risk goal of 1x10(one in a million)attributable to this site is acceptable Two contaminants were considered- Benzene in soil and water, and 1,2-DCA in water. Gasoline was not a compound available in CaITOX Human exposure pathways were inhalation of soil vapors and consumption of fivits and vegetables grown on site As mentioned previously the type of use and position of the property excludes any other long term exposure pathway The most susceptible persons are females 19+ years because birth defects are attributed to this group Benzene in Soil and Water= Risk of 1 Ox 10-256 1,2-DCA in water= Risk of 2 6x10"' . The above risk assessment indicates that the goal of one in one million is surpassed by this site 5