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M B dLL Table 4. Noise Impact from Traffic Increase Traffic Volume Increase Potential Traffic Noise Increase 25% 1 dB 50% 2 dB 100% 3 d B 8 Elimination of Short -Term Rentals Could Cause the Construction of New Hotels to Meet Demand; the Construction of New Hotels Would Result in Numerous Environmental Impacts That Require Studying As detailed in the Ramboll memorandum ""ECONOMICS ANALYSIS OF SHORT-TERM RENTAL REGULATION", the prohibition of STRs, including those currently operating within the City, could compel tourists to seek alternative accommodations, increasing demand for hotels and potentially leading to the development of additional hotels as a reasonably foreseeable consequence of the STR ban. The construction of hotels has impacts on the environment that have not been studied. In particular, construction of hotels has potential noise and air quality impacts as discussed below. Potential Hotel Construction Air Quality and Health Impacts Resulting from STR Ban Ramboll performed a screening health risk assessment to determine the potential cancer risk resulting from construction activity of a hypothetical new hotel. The emissions associated with the construction of these hotels encompass on -site, off -road heavy equipment, off -site, on -road vehicle travel, architectural coating, paving, and fugitive dust. Ramboll utilized CalEEMod to estimate construction emissions from a 250-room hotel as shown in Appendix B, which is an average mid -size hotel. Ramboll used an existing hotel project site to model emissions in AERMOD as a surrogate for the space of hotel construction. Concentrations resulting from diesel particulate matter (DPM) emissions from off - road construction equipment in CalEEMod were modeled on receptors in a grid of 20 meters. The health risk assessment used default exposure assumptions for residents as outlined by OEHHA.16 As indicated in Table 5, the construction of a hotel without emissions mitigation results in an excess cancer risk of 48 in a million for the maximum exposed individual (MEI), which exceeds the SCAQMD's threshold of 10 in a million. Cancer risks continue to exceed the threshold until a distance of 450 feet from the construction area. Table 5. Cancer Risk from Hotel Construction Source Cancer Risk (in a million) Construction of a 250 room Hotel 48 SCAQMD Threshold of Significance 10 Potential Hotel Construction Noise Impacts Resulting from STR Ban Construction of structures generates noise, which is regulated by the City of Santa Ana. 16 OEHHA. 2015. Air Toxics Hot Spots Program. Risk Assessment Guidelines. Guidance Manual for Preparation of Health Risk Assessments. February. 11/14