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I Table 4.7.4 shows the results of the CANINE -4 analysis for the peak 1 -hour and 8 -hour traffic periods in parts per million (PPM). The analysis was carried out for existing traffic, with the addition of project traffic (1993) and in 2010 both with and without the project. The 1 -hour values are to be compared to the federal 1 -hour standard of 35 PPM and the state standard of 20 PPM. The 8 -hour values in Table 4 are to be compared to the state and federal standard of 9 PPM. Existing concentrations at the three intersections are below applicable state and federal standards. Concentrations with the project are expected to be below applicable federal and state standards for all forecast years. Project impacts on local carbon monoxide concentrations are considered to be less than significant. Mitigation 4.7-3 No mitigation measure is required or recommended. Impact 4.7-4 The transfer station would create a number of potential odor sources. Solid waste itself is an obvious potential odor source. The unloading areas, equipment that comes in contact with waste, collection vehicles and landfill transfer trailers are also potential odor sources. The severity of any odor impacts is highly dependant on operating procedures. The longer refuse is stored on-site, the greater the potential for odor, particularly in the warmer summer months. The odor potential for unloading areas and equipment is dependant on "housekeeping" practices and how often equipment is cleaned. The surrounding land uses are primarily industrial and agricultural uses that are not sensitive to odors. There are, however, two residences located with 600 feet of the project site. Project impacts on odors are considered potentially significant. Mitigation 4.7-4 The following mitigation measures would reduce potential odor impacts to a level that is less than significant. • The proposed transfer operation would be enclosed in a building to reduce exposure of waste to the atmosphere. • The tipping floor area should be cleaned daily, as should the transfer trailers themselves. • Transfer trailers should be periodically steam cleaned to remove accumulative grease and dirt. • As requested by the SJVUAPCD, a standard operating procedure (SOP) shall be developed to address the elimination of the generation and emission of odors as much as possible. The SOP shall also include measures to allow for the shortest possible holding time of waste brought to the facility, as well as contingency measures in the event of excess odor generation and/or nuisance complaints. ER -93-1 -91 - (9-27-93)