COM 0575.000 1996-1998 - Laserfiche WebLink

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. ~ ~ employing a system of gutters, storm drains, drywells and related structures to ensure that all runoff is contained onsite. This is a requirement of the County of Hawaii as pazt of the rezoning and subdivision process, and it is expected that during the review process appropriate mitigation measures will be developed. Based on expected mitigation measures, no net impact to the applicant's or neighboring property or any areas downstream would result from the proposed project. Lava Flow and Earthquake Hazards: Existing Conditions The entire Big Island is subject to geologic hazards, especially lava flows and earthquakes. The United States Geological Survey (USGS) classifies the area, which is on the slopes of the dormant volcano Hualalai, as Lava Flow Hazard Zone 4, on a scale of ascending risk 9 to 1. Less than 15 percent of the ground surface within Zone 4 has been covered by lava within the last 750 yeazs. _ The entire island of Hawaii is in Zone 3 on a scale of ascending risk 1 to 4 in the Seismic Probability Rating. Major damage corresponding to a score of 7 or above on the Modified Mercalli Scale is possible. Lava Flow and Earthquake Hazards: Impacts and Mitigation Measures No adverse impacts related to geological hazards is expected to result directly or indirectly from the proposed rezoning. Air Quality and Noise: Existing Conditions - Air quality in the project area is currently mostly affected by emissions from motor vehicles and natural sources. Volcanic emissions of sulfur dioxide convert into particulate sulfate which causes a volcanic haze (vog) to blanket the azea, a consistent problem in Kona. Motor vehicles on Mamalahoa Highway and adjacent roads and homes emit CO, nitrogen oxides and hydrocarbons (an ozone precursor), as well as smaller amounts of other pollutants. Noise is generated on-site by residential and agricultural activities and off-site by similaz activities and subdivision roads. Because the parcel is adjacent to a number of residences, noise levels are moderate on the site. Air Quality and Noise.• Impacts and Mitigation Measures The proposed rezoning would result in a very slight increase in the density of residential activities in the neighborhood and would thus generate additional air pollution and noise. The increase in both would be negligible in the context of the existing environment, and merit no special mitigation measures. Environmental Repan, TMK 7-3-53:49 Page 3