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N� KLE1NF LD_=R Bright People.BightSolutiou 1 INTRODUCTION Kleinfelder has prepared the following health risk analysis (HRA) to evaluate the cancer health risks associated with increased diesel truck traffic resulting from the expansion of the East Stockton Recycle and Transfer Station. The facility is located at 2435 Weber Avenue in Stockton, California (the Site), as shown in Figure 1. The proposed project consists of consolidating the current Site operations and the operations now occurring at the company's facility at 401 Lincoln Street in Stockton. The Site is currently permitted for 512 tons per day (tpd) of recyclable material and will be expanded to a permitted capacity of 1,000 tpd, with a maximum capacity of 1,250 tpd. Vehicle traffic changes will mostly involve an increase in heavy-heavy duty (HHD) diesel trucks that collect and transport or transfer recyclable material to this location. The proposed project will increase truck trips to and from the facility as well as traffic at the site itself. These trucks emit diesel particulate matter (PM), which has been determined to be a toxic air contaminant that has potential to cause cancer. Thus, the additional diesel emissions from truck traffic will pose increased health risk to residents, of which the closest are located across Weber Avenue from the Site. The following report documents the results of this HRA. Section 2 discusses the trip information, emissions rates and emission calculations of the diesel truck traffic associated with the proposed project. The methodology of the assessment is reviewed in Section 3. Section 4 reports the risk results from the modeling and Section 5 presents the conclusions of this HRA. Additional technical data and model output are provided in Appendix A. 121339/1 RV1 1 Rxxx Page 1 of 7 September 15, 2011 Copyright 2011 Kleinfelder