08/07/84 - Laserfiche WebLink

Home

m I I I I I I I I I I I I I I I I I I t~ese assessments has already beengathered by the applicant. Re applicant will provide additional information as the EI$ progresses. Mitttgatton techniques will ~lso ~ discussed, ~ . ~ second way that landfills can alter surface water bodies is through ~urface runoff. C)~atnage patterns and erosion will change at the ~tte as be~s are built, and as the fill is excavated, used and ~losed. The EIS will describe the site's existing drainage condi- tions and anticipated changes associated with construction, operation ~nd closure of the pro~ect. ~he applicant has proposed several surface water management tech- niques to assure' that drainage and erosion do not become problems. For instance, they will divert ~ater to unfilled portions of the ~roposed excavation during the operation of the landfill and use a Qettling pond to control runoff from fill areas that are at, or ~early at, their finished elevations. The adequacy of these propcsed neasures will be evaluated. Among the issues to be discussed in the ~valuation will be potential impacts on the Minnesota River Bluffs. The liS will summarize the potential for surface water problems and )assess any health problems that may result from surface water pollu- !tion. Risks to the nearby bluffs and biological communities will lalso be ascertained. Measures to mitigate adverse effects, including Ithose measures proposed by the applicant, will be discussed. fair Quality Sources of air quality changes at a landfill include truck tra.ffic, landfill equipment, landfill gaseS, wind erosion and uncovered refuse. The £IS will use information on landfill equipment and truck types, volmnes, travel routes and ope'rating hours to evaluat~ the magnitude and areal extent of impacts from engine emissions. The potential for equipment and trucks to contribute to dust problems by traveling on unpaved access roads and work areas at the site will ~also be discussed. , Gas production occurs when landfilled materials decompose through biological processes. Landfill gas production is occurring at the present Flying Cloud Landfill site and can be expected to occur at the expansion area. Gas production can be a concern for several reasons. For instance, hydrogen sulfide has a very repugnant odor. Methane gas is odorless and colorless, but is explosive in concentrations of five to 15 per- cent in air, Carbon dioxide gas does not pose a health threat, but it is'water soluble and can decrease the pH, and thus increase the corrosiveness, of leachate. The proposer has developed a conceptual plan to control landfill gas problems, particularly methane migration prcblems. The applicant must provide details of this plan in order that its adequacy can be asssessed in the EIS. The current state of the art for methane control will be reviewed, potentially affected areas (particularly the adjoining drive-in theater and residences} will be i~entified,