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Molin Concrete page 9 e. Irrigation for buffer area. comment: Molin is requesting that this condition be deleted (see letter). The "buffer area" is the berm. The revised landscaping plan submitted with the current application includes species that are more drought tolerant than the previous plan. Molin's landscaping consultant recommended these plants. Quantities are similar to the original plan. The irrigation system would be expensive: Molin estimates $18,000. Staff recommends eliminating the requirement for an irrigation system on the berm. 14. The Interim Use Permit will expire if there is a change in the land use in the LI District. comment: This is not an issue to date. The approved storage activities continue. Noise Excerpts from MPCA rules are listed below with comments following them. MN Rules 7030.0020 DEFINITIONS Subp. 7. L10. "L10" means the sound level, expressed in dB(A), which is exceeded ten percent of the time for a one hour survey, as measured by test procedures approved by the commissioner. Subp. 8. L50. "L50" means the sound level, expressed in dB(A), which is exceeded 50 percent of the time for a one hour survey, as measured by test procedures approved by the commissioner. MN Rules 7030.0040 NOISE STANDARDS. Subpart 1. Scope. These standards describe the limiting levels of sound established on the basis of present knowledge for the preservation of public health and welfare. These standards are consistent with speech, sleep, annoyance, and hearing conservation requirements for receivers within areas grouped according to land activities by the noise area classification (NAC) system established in part 7030.0050. However, these standards do not, by themselves, identify the limiting levels of impulsive noise needed for the preservation of public health and welfare. Noise standards in subpart 2 apply to all sources.