06-30-14-WS - Laserfiche WebLink

Home Browse Search

more varied topography and steep slopes. It is assumed that the majority of onsite earthwork should balance on site. 11.WR ATERESOURCES D..... a. ESCRIBE SURFACE WATER AND GROUNDWATER FEATURES ON OR NEAR THE SITE IN AI AND AII BELOW i. S-,,,,/ URFACE WATER LAKES STREAMS WETLANDS INTERMITTENT CHANNELS AND COUNTYJUDICIAL .I,/, DITCHESNCLUDE ANY SPECIAL DESIGNATIONS SUCH AS PUBLIC WATERS TROUT STREAMLAKE ,/, WILDLIFE LAKES MIGRATORY WATERFOWL FEEDINGRESTING LAKE AND OUTSTANDING RESOURCE .I VALUE WATERNCLUDE WATER QUALITY IMPAIRMENTS OR SPECIAL DESIGNATIONS LISTED ON THE MPCA303IWL1.I CURRENTDMPAIREDATERSIST THAT ARE WITHIN MILE OF THE PROJECTNCLUDE DNRPWI(),. UBLICATERSNVENTORY NUMBERS IF ANY One stream, Rice Creek, crosses through the AUAR study area. Rice Creek is a DNR Public Water. A wetland delineation conducted by Ramsey County found 58 areas that met the criteria to be considered wetland within the 429 acre AUAR study area. The 58 wetland areas collectively cover approximately 14.4 acres, of which approximately 6.5 acres are located within railroad or road ditches or were created as a result of site grading and runoff from impervious surfaces and may not be considered jurisdictional wetlands (seeFigure 7-1). However, for purposes of this analysis, all areas meeting the wetland criteria (14.4 acres) were assumed jurisdictional and evaluated for impacts. Within one mile of the AUAR study area, there are three waterbodies that are on the MPCA’s Impaired Waters List: Rice Creek, Long Lake (PWI #67P), and Valentine Lake (PWI #71P), of which only Rice Creek receives runoff from the site. Round Lake is not listed as impaired by the MPCA but is known to have impaired sediment. ii. G–,,.I:1);2) ROUNDWATER AQUIFERS SPRINGS SEEPSNCLUDE DEPTH TO GROUNDWATER IF PROJECT MDH;3)/ IS WITHIN A WELLHEAD PROTECTION AREA IDENTIFICATION OF ANY ONSITE ANDOR NEARBY ,.I WELLS INCLUDING UNIQUE NUMBERS AND WELL LOGS IF AVAILABLEF THERE ARE NO WELLS KNOWN ,. ON SITE OR NEARBY EXPLAIN THE METHODOLOGY USED TO DETERMINE THIS According to historical observations by Ramsey County, groundwater is shallowest in the area directly south of Rice Creek where it is approximately 4 to 5 feet deep. The AUAR study area is within a wellhead protection area for drinking water (seeFigure 11-1). A wellhead protection area is a recharge area to a public well and is the area managed by the public water supplier, as identified in the wellhead protection plan, to prevent contaminants from entering public wells. Additional guidance will be required from the Minnesota Department of Health to evaluate proposed stormwater infiltration projects that are located within this area. The Army established an extensive network of monitoring wells, groundwater extraction wells, pump houses, and associated piping within the AUAR study area in the mid-1980s which operate continuously, pumping contaminated groundwater to a treatment facility also within the AUAR study area (seeFigure 12-1). The Army will continue to own and operate the system regardless of changes in land ownership, and will continue to conduct all required groundwater sampling and the maintenance June 2014– Final AUAR10