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

Home

I I I I i ! I I I I I I I I I I I I Minnesota Rules 7001.3200 B, D, E & H also address site suitability based on the site's capability of groundwater protection, the feasibility of remediation of polluted groundwater and the ability to meet standards for erosion and drainage. Several types of evaluations are commonly used to determine site suitability. The evaluation systems include: · U.S. EPA Criteria for Identifying Areas of Vulnerable Hydrogeology and RCRA-Statuary Interpretive Guidance (CIAVH); · Site Suitability Criteria Used by the MPCA; · MPCA Report on Groundwater Contamination Suscept~ility; · U.S. EPA's DRASTIC Index for Determining Groundwater Pollution Potential; and · U.S. EPA Hazard Ranking System. U.S. EPA Criteria for Identifying Areas of Vulnerable Hydrogeology (CIAVH) The CIAVH guidance document addresses avoiding vulnerable or sensitive environments when siting solid and hazardous waste facilities. The vulnerable areas are determined based on the time of travel (TOT) needed for leachate to move from a disposal unit to an underlying aquifer. Locations with short TOT's, where the groundwater moves fairly rapidly, are considered more vulnerable than those with long TOT's. In general, the EPA uses a TOT of 100 feet in 100 years as the criterion for determining vulnerability. Times of travel can be calculated from data commonly available such as hydraulic conductivity. The criteria distance of 100 feet divided by hydraulic conductivity results in the time of travel. The hydraulic conductivity ranges and the calculated TOT's for the various hydrogeologic units at Sites Q, P, and D are presented in Table No. 1. 17