ARCHIVED REPORTS_2011 - Laserfiche WebLink

Home Browse Search

CLE/NFL®E Bright People.Right Solutlo- i3 EXPOSURE ASSESSMENT The HRA was prepared to assess the potential health risks that may result from the proposed increase in truck traffic. Diesel particulate matter is the primary toxic of concern and has long-term health effects (i.e., cancer and chronic [noncancer]) with the primary path of exposure occurring through inhalation for both residents and workers. This assessment was performed to compare the facility impacts to thresholds of 10 in a million cases of cancer and Health Hazard Indices of 1.0 for chronic health risk as the levels of concern. 3.1 Health RiskAssessment ethoolo IToxic emissions of diesel PM from trucks were assessed using the United States Environmental Protection Agency (EPA)AERMOD (v 09292) using the BREEZE software t (v 7.2). The quantification of toxic emissions from these sources is provided in the emission calculations shown in Section 3 and detailed in Attachment A. The source parameters were all assumed to be HHD trucks with vertical stacks per the San Joaquin Valley Air Pollution Control District (SJVAPCD) Guidance for Air Dispersion Modeling I (August 2006). Volume source parameters were estimated using EPA's User's Guide for the Industrial Source Complex (ISC3) Dispersion Models (Volume III). The source and model parameters are summarized below: Emission Source Non-idling trucks as line of volume sources and idling trucks as line of point sources Rural/Urban Mode Urban Grid Resolution Variable (sensitive receptors) Grid Extent Approximately 0.25 km x 0.25 km (0.16 miles x 0.16 miles) Number of Receptors 73 Regulatory Option Option Used Meteorological Data 5 years (2005-2009) of surface and profile hourly from Stockton. Obtained from SJVAPCD. Averaging Time Annual 121339/IRV11 Rxxx Page 4 of 7 September 15, 2011 Copyright 2011 Kleinfelder