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1658 city of gainesville s pearson comments on fdep memo on koppers on site risk assessment 4 5-2010
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1658 city of gainesville s pearson comments on fdep memo on koppers on site risk assessment 4 5-2010

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  • 1. City of Gainesville Memo To: Fred Murry, Assistant City Manager Teresa Scott, P.E., Director of Public Works From: Stewart Pearson, P.E. Date: 4/5/2010 Re: DEP/UF Risk Assessment March 28, 2010 The correspondence from DEP dated March 28, 2010 and UF dated February 3, 2010 defines the basis of revisions to be made to the risk assessment for the Koppers site. The following is prepared to help interpret the findings by the UF Center for Environmental & Human Toxicology that used available site data and commercially available software that simulates the modeling done by the AMEC firm for Beazer but produces different results due to the differing basic assumptions. . Figure 2 is excerpted from the Risk Assessment by AMEC, dated August 19, 2004 (Figure 2-4) and identifies the use areas of the site. The figure has been amended to show the location of the risk values and the comparative risk from the UF report. The following table presents the results of the UF report for the areas of the site that border the residential neighborhood to the west and the amount of the excess cancer risk for that area as compared to the State of Florida criteria. For example the Western Active Area (WAA) has 107 times the cancer risk allowed by the State according to the UF data. Koppers Onsite Risk Forecast Values Source: UF Letter Report Feburary 3, 2010 Border Areas of Site 95%ile on Comparative Dioxin EPC risk Risk Area (ng/kg) distribution (95%ILE/SFR) NCIA 92709 3.61E-03 3,610 NEGA 6231 2.42E-04 242 NWGA 1291 5.02E-05 50 SWWA/open 3910 1.52E-04 152 WAA 2740 1.07E-04 107 State of Fl Risk Criteria (SFR) 1.00E-06 1
  • 2. SFR X 152 SFR X 50 SFR X 107 SFR X 3,610 SFR X 242 SFR = State of Florida lifetime excess cancer risk of 1/1,000,000 2 .