Agenda - Council - 09/25/1990 - Laserfiche WebLink

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I I ! I I I I I I I I I I I I I Site Q also has many secondary criteria exceedances. Bunker Hills Regional Park runs north to south along the east side of the site. Much of this site is currently zoned as park land. Wetlands and related drainage are present on-site and could likely be impacted or destroyed during construction/operation of the site. Over 50% of the water supply wells in the immediate area are screened in the buried outwash/lower sand aquifer. Although the majority of this unit is overlain by glacial till, a portion of the lower sand is directly connected to the upper sand un~t'ii'fie to the lack of glacial till found. This lack of continuous glacial till also exposes the lower St. Lawrence Franconia bedrock aquifer to potential contamination via the upper/lower sand connection. Approximately one-third of the local water supplies utilize this bedrock aquifer as the source. Seven % of the water supply wells reportedly utilize the upper sand unit. This figure could be as high as 35% due to the lack of well construction data. This unit would be most likely impacted by any Site Q groundwater contamination. The upper and lower sand units as well as the bedrock formation are Capable of producing tens of hundreds of gallons per minute. Secondary siting criteria exceeded at Site D includes the inclusion of 12 residences within the 1,000-foot boundary of the proposed site location. Land to both the north/northwest and east/southeast is designated as floodplain and is made up of peat bog and agricultural land. Wetlands comprise 28% of the site with these wetlands eventually draining the surface waters into Cedar Creek. A signifiCant portion of the wetland would be impacted/destroyed during construction and operation of the landfill, this drainage of potentially impacted surface water off-site to Cedar Creek poses a potential problem. The surface water is already acknowledged as being contaminated from the neighboring Oak Grove Landfill. A total of 480 water supply wells were identified within a one-mile radius of the proposed site. Well construction data was available for less than one-third of the 480 wells. Of the available data, it was reported that 4% were using the shallow water table drift aquifer, 41% the buried outwash drift aquifer and 49% utilized the St. Lawrence Franconia and Ironton-Galesville bedrock aquifers. It is very possible that a significant portion of the two-thirds unreported wells are utilizing the shallow drift water table aquifer as the source of the water supply, thus grossly underestimating the use of 21