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Keahole. Noise control treatments have been implemented for the existing plant <br />equipment. Each treatment project will specify property line sound level targets for the <br />equipment. These targets will vary with a goal of meeting HELCO's overall property line <br />target of 55dBA during daytime operation and 45 dBA during nighttime operation for all <br />plant equipment. <br />28. Scenic Resources: The applicant has stated that "in order to lessen the visual impacts of <br />the improvements to the generating station on the immediate neighboring community, <br />HELCO has sought and received approval from the DLNR for landscape improvements, <br />gate modifications, and fence construction at the site. The perimeter landscaping along <br />the southwest, west, and northwest section of the property will be redone to help mitigate <br />the adverse visual impacts of the improvements to the station. HELCO will create <br />bermed planters in areas that are currently landscaped and transplant some of the existing <br />vegetation. New trees and plants will also be added to create a more effective and <br />attractive visual buffer. The proposed planters are approximately 9,500 square feet." The <br />applicant will also convert its existing fence into a permanent perimeter fence and modify <br />two existing gates by recessing the gates into the facility. The new gates will be <br />automated, electronic card -reading gates. <br />29. Air Quality: Emissions from the Keahole Generating Station have been monitored by air <br />quality monitoring stations located approximately 1.2 miles southeast of the plant and 3.4 <br />miles north of the plant. The monitoring data confirms compliance with State and <br />Federal ambient air quality standards for SO2 (sulfur dioxide), PM10 (particulate matter), <br />and CO (carbon monoxide). <br />A study titled, "Climate and Air Quality Assessment" was conducted by Jim Clary <br />& Associates in July, 2004 (Appendix 1). Robert E. Paull prepared a report titled <br />Emission Studies — Impact on Keahole Agricultural Park, dated June 27, 2004 (Appendix <br />L). The report examined the potential impacts of ethylene, sulfur dioxide (SO2) and <br />nitrous oxide (NO2) on plants and crops in the Keahole area. Given the infrequency and <br />short duration of plume impact from the stacks on the agricultural park and the lack of <br />information on orchid phytotoxicity to these gases, it was difficult to determine the <br />-7- <br />