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C. Effects Of The Project That Cannot Be AUtigated To A Level Less Than Significant. Potential Significant Effect Without appropriate mitigation, the project has the potential to impact air quality due to emissions of ozone precursors(NOx.VOC)from project operation of onroad material transport. Description of Specific Impact The Project specific emission increase from transport of biosolids was determined by difference between actual emissions attributed to transport of material during the baseline period and the 2,000 tpd case predicted emissions from transport of up to 2,000 tpd of material(biosolids or a combination of biosolids and other permitted materials). 2,000 TPD Case(Onroad Transport) Exhaust emissions result from onroad mobile source equipment used to transport waste (heavy-heavy duty diesel trucks)were determined using URBEMIS 2002. The land use category used in the modeling was"General Heavy Industry"and the Project location type was specified as"rural." Emissions from material transport were modeled using a fleet consisting of'heavy-heavy duty diesel fueled trucks. The trip count used,in the URBEMIS modeling runs was determined by doubling the loads per day of waste,calculated by dividing tons per day of material by 22 tons per truck load. 2,000 tpd case transport emissions were calculated from the number of truck loads (trips) required to transport 2,000 tons per day of material and the weighted average distance to likely biosolids generators located within California. 2,000 tpd case predicted emissions were calculated using a daily rate equal to 182 vehicle trip ends per day.(91 truck loads of waste per day). Travel to the facility is typically via Interstate Highway 5 and-State Route 46. Consequently, emissions from transport of material were modeled using an average speed equal to 55 miles'per hour. The location of likely biosolids generators were obtained from an EPA database listing California facilities with active national pollutant discharge elimination system (NPDES). permits that have a two digit standard industrial classification(SIC) equal to 49. For facilities with missing or obviously incorrect locations, the longitude and latitude of the centroid of the 9-digit zip code area was used. For facilities located outside of the San Joaquin Valley, the facility was associated with the nearest travel point providing access to the San Joaquin Valley. Likely transport routes were generated by assuming that the biosolids would be transported over major roads and highways. The most likely travel route from a given facility to the Lost Hills Disposal Facility was determined using a simple "travel cost surface,"where "travel cost"was assumed proportional to the type of roadway system. For example it "cost more" to travel on a surface road than to travel on a two lane highway and it "cost more" to travel on a highway than to travel on a freeway. ("travel cost" _ desirability in terms of time, safety, speed, convenience, etc.). The travel distance was weighted by assuming that loads of material received from a given facility (or access point for facilities outside of the valley),would be: 1) directly proportional to the amount of ------ --- - - ------- Findings of Fact—Section 15091 March 15,2016 H.M.Holloway Landfill Modification Project Final Board of Supervisors 8