5.4. SR 05-17-2010 - Laserfiche WebLink

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Landmark Environmental LLC May 6, 2010 Ms. Rebecca Haug Environmental Administrator City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: Elk River Landfill -Request for CUP and License Amendment, February 2010 Dear Ms. Haug: Landmark Environmental has completed a review of the Elk River Landfill (ERL) -Request for CUP and Solid Waste Facility License Amendment project, as directed. The following comments were generated related to ordinance requirements and potential environmental concet7is associated with the proposed landfill expansion. The application expands the authorized. extent of the current landfill and proposes the placement of waste to the south property boundary. This design for the expansion (Cell 18) does not meet the establishment of a suitable buffer zone on the site, as required by City ordinance. The engineering plans for the request show that landfill facility features, uicluding the perimeter access road, soil berms and screening, are located offsite on the property located to the south. The engineering design for landfill expansion will require approval from the State of Minnesota for deviation from thew waste fill setback rule of 200 feet from the property boundary (MN Rules Part 7035.2815, Sub. 5. C.). Page 1-1 Back rg ound The application indicates that the site is 476.8 acres. The site, as indicated in the current CUP/License, is a subarea of the area indicated in the application. Page 2-4 Groundwater The expansion will require the abandonment of monitoring wells/piezometers 2090WA, 2130WA and P213B as part of the development for Cell 18 and this should be complete according to Minnesota Departtnent of Health Water Well Rules. Similarly, landfill gas monitoring probes GP23 and GP24 will require abandomnent and replacement and the Landfill Gas Monitoring Plan will need to be revised accorduigly. Given the construction of liner system up to the south property boundary, it is apparent that wells acid gas probes will be replaced offsite, on adjacent property south of the ERL. A revision to the current Phase N Water Quality Monitoring Work Plan will be required to address the replacement of monitoring welUpiezoteters 2090WA, 2130WA and P213B. ERL has installed numerous monitoring welUpiezometers outside of the current buffer area in order to investigate the nature and extent of contaminant migration associated with the historic unlined waste deposit. For the lined expansion of ERL, monitoring welUpiezometers and gas probes would typically be located within the 200-foot buffer area surrounding the waste deposit. Page 2-7 Proposed Landfill Design From an overall engineering standpoint, the design of the Cell 18 expansion area is feasible/acceptable. The south interior sideslope (a strong area of coticet•n) is proposed as a 3:1 grade, which is standard 2042 W. 981h Street Bloomington, Minnesota 55431 Phone: (952) 887-9601 Fax: (952) 887-9605 www.landmarkenv.com