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CE <br /> GENESIS ENGINEERING&REDEVELOPMENT <br /> AOC 13 <br /> One surficial ash sample on the silo foundation exceeded the lead and dioxin screening <br /> levels. <br /> COPC Screening Level Maximum Units <br /> Concentration <br /> Lead 80 1,300 mg/kg <br /> Dioxin(TTE) 4.6 26.9 pg/g <br /> The groundwater concentration for arsenic was above the MCL but was in the same range as <br /> City of Manteca groundwater, suggesting a natural source of arsenic. No other analyzed <br /> constituents were above limits in groundwater. As groundwater is 28 feet below ground <br /> surface and soil appears impacted only to a maximum of 2 feet bgs, groundwater is not <br /> expected to be impacted by Site activities. <br /> 2.6 Site Risks <br /> Arcadis(2012)developed a Conceptual Site Model to assess exposure risks. Complete <br /> pathways for the Site include incidental soil ingestion, dermal contact with soil, and <br /> inhalation of airborne particles. A "complete" pathway must meet all four conditions: a <br /> source and mechanism of chemical release, a retention or transport medium, a point of <br /> potential human contact, and an exposure route (EPA 1989). <br /> Arcadis(2012) identified several exposure pathways as summarized in the table below. <br /> Exposure Pathway Threat of Exposure Estimated Health Risk <br /> Inhalation of soil particulates, Low,workers would use personal <br /> Weed Abatement Worker incidental ingestion,dermal contact protective equipment and <br /> with soil exposure is intermittent <br /> Inhalation of soil particulates, Low,trespassers would be <br /> On-Site Trespasser incidental ingestion,dermal contact <br /> intermittent <br /> with soil <br /> Ingestion through consumption of Unknown,as there is uncertainty <br /> Home Grown Produce Consumer produce grown on-Site(fruit/nut associated with uptake from the <br /> trees) soil into the produce <br /> Downgradient Groundwater User Shallow groundwater is not used as None,lack of exposure pathway <br /> a water supply source <br /> Off-Site Human Receptors Inhalation of soil particulates Low,intermittent exposure <br /> duration <br /> Former Gordon Research Company Property 7 of 20 <br /> Removal Action Workplan <br /> June 2017 <br />