Airport Improvement Program March 11, 1988

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2.7 WETLANDS Wetlands do not occur on the site. However, two wetland areas adjacent to the site may be affected by airport improvements. Anoka County Wetland No. 117 is immediately east of the proposed runway (Figure 2-11). Wetland No. 117 is a Type 3 wetland, a protected classification. This wetland will receive storm water runoff from the paved runway and adjacent grassed areas. If necessary, a storm water detention basin will be built to detain runoff water before its release to the wetland. Final design grades of the site must be set before the need for a detention basin can be determined. The relocation of County Road 116 may affect Anoka County Wetland No. 118, a Type 3 wetland, which is located north of the site. County 116 will be relocated north of its present alignment to accomodate lengthening of the runway to the northwest. Final design grades and right-of-way must be deter- mined before any impact on the wetland can be assessed, although impacts are expected to be minimal. The wetlands will be protected by erosion control measures and sedimentation traps during the construction and thereafter until the turf is established. The wetlands may be used as natural drainage basins for storm water runoff from the proposed site. 2.8 AIR QUALITY Air pollutants are measured according to two sets of standards - Primary and Secondary. The Primary standards are set such that the average concentrations given for a set period of time represent the maximum allowable limits which do not affect the health of the general public. Secondary standards are set at a level such that the average concentrations given for a set period of time represent the maximum allowable limits at which no adverse effects on soil, water, vegetation, materials, animals, visibility or personal comfort and well being are experienced. Minnesota utilizes the Federal Ambient Air Quality Primary and Secondary Standards except Minnesota has a more stringent standard for sulfur dioxide than the Federal Standards. The number of automobiles visiting the Airport relative to the number in the community and surrounding area will continue to be very small. When compared to vehicle activity in the industrial park and residential areas, the airport's contribution is almost insignificant. Air pollution caused by aviation has been the subject of numerous studies. The pollutants of aircraft engines, both piston and turbine, are the same as those of automobile emissions, that is carbon monoxide, nitrogen oxides, sulphur dioxide, particulates, 2-26