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4.7. SR 04-20-1998ITEM 4.7. Howard R, Green Company CONSULTING ENGINEERS April 17, 1998 File: 230369M-0030 CONSULTING Formerly MSA Consulting Engineers Honorable Mayor and City Council City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330-0490 RE: GUARDIAN ANGELS ORONO LAKE DEVELOPMENT Dear Council Members: Attached is a feasibility study for the Guardian Angels Orono Lake Development. This feasibility study was authorized by the City Council on March 16, 1998, based on a petition from Guardian Angels of Elk River. The feasibility study discusses the sanitary sewer and water improvements necessary internal to the Guardian Angels development, along with a watermain loop to the east necessary for fire flow protection. Along with this watermain loop, there is a small piece of sanitary sewer proposed to serve the Elk Motel and the Keyser property. The final component of this feasibility study is a bituminous pathway from the Guardian Angels development to the Elk Bowl driveway. This was a recommendation of the Park and Recreation Committee. The total estimated cost of the proposed improvements is $207,300. Approximately $158,100 can be assessed to the benefited properties, with the remaining $49,200 being proposed to be funded by park funds and municipal utility funds for the bituminous trail and watermain looping. Attached to this letter is a resolution for the City Council's consideration, which receives the feasibility study and orders the public hearing to be held on May 18, 1998. If you have any questions regarding this project, I will be in attendance at your April 20, 1998, City Council meeting. Sincerely, Howard R. Green Company TJM:tw Attachment O: \PROJ'L?,30369M\359- ! ?06. apr. doc 1326 Energy Park Drive · St. Paul, MN 55108 · 612/644-4389 fax 612/644-9446 toll free 888/368-4389 RESOLUTION 98- A RESOLUTION FOR THE CITY OF ELK RIVER A RESOLUTION RECEIVING THE FEASIBILITY REPORT AND ORDERING A PUBLIC HEARING ON THE IMPROVEMENT IN THE MATTER OF THE ORONO LAKE DEVELOPMENT IMPROVEMENT OF 1998 WHEREAS WHEREAS the Feasibility Report ordered by the Council in Resolution 09-22 has been prepared with reference to the Orono Lake Development improvement and was received by the City on April 20, 1998; and the Feasibility Report recommends that the proposed improvement is feasible; NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Elk River, Minnesota: The City Council will consider the Orono Lake Development improvement as described in the Feasibility Report and the assessment of the property abutting this proposed improvement for all or a portion of the cost of the improvement pursuant to Minnesota Statutes, Section 429 at an estimated total cost for the improvement of $207,300. A public hearing shall be held before the City Council on the proposed improvement on the 18th day of May, 1998, at 7:00 o'clock p.m. at Elk River City Hall. The City Administrator shall provide ten days mailed notice and two weeks published notice on the hearing as required by law. Passed and adopted this 20th day of April, 1998. ATTEST: Henry A. Duitsman, Mayor Sandra Thackeray, City Clerk O: \PRO J\230369M\359-1706. apr. doc of iver TO: FROM: Memorandum MAYOR AND CITY COUNCIL STEPHEN ROHLF, BUILDING AND ZONING ADMINISTRATOR DATE: APRIL 20, 1998 SUBJECT: UPDATE ON ELK RIVER LANDFILL Five year remedial action plan. The City of Elk River may be the only city in the state that licenses a landfill. The city's reason for doing so is to ensure clean up of contamination on the landfill property, prior to it migrating off site. The cells at the landfill now are line and contain leak detectors. The original cell from 1972 was not lined and has associated contamination. Volatile Organic Compounds (VOCs) are the main contamination issue. With landfills, heavy metals are generally not as much of an issue. This is the second year of a five year plan to see if final cover and active gas venting works as a remedial action for VOCs. This plan of action has been agreed to by the Elk River Landfill, Sherbume County, MPCA, and the City of Elk River. Ground water data will be monitored in 1997, 1998, 1999 to see what effects final cover and active gas venting has on reducing the levels of VOCs. If by 1999 the data collected shows stable or decreasing VOCs in the ground water, the landfill will be given two more year to prove that this is an effective clean up measure. If improvement is not shown by 1999, the landfill will need to begin a feasibility study on additional remedial measures. The next clean up step could possibly be a pump and treat. · The landfill gas to electricity project will be proceeding, but the MN Pollution Control Agency (MPCA) air emission permit still need~ to be resolved. Hot hit (contamination) in monitoring well P 17 C, west side of landfill property. Apparently, this well is contaminated with leachate not landfill gas. The landfill did five borings down gradient to determine the extent and direction of flow for the contamination. The contamination was not detected in the borings. Additional monitoring wells will be added in 1998 in the projected direction of flow of this contamination and deeper borings will be done to determine if it is migrating 13065 Orono Parkway · P.O. Box 490 · Elk River, MN 55330 · TDD & Phone: (612) 441-7420 ° Fax: (612) 441-7425 downward instead of laterally. It may be that this is one slug of contamination moving through. Ground water monitoring in bedrock. The landfill feels confident by additional testing they have done that low levels of VOCs found in the bedrock at their site is not a contamination issue. Since this issue involves the aquifer that serves thousands of people, staff does not feel comfortable accepting the landfill's findings on face value. The landfill has agreed to continue ground water monitoring in the bedrock. Ground water monitoring northeast side of landfill. Wells 32 and 33 on the north side of the landfill are showing VOC contamination that may be due to landfill gas. The proposed demolition cell should help resolve this issue, if it is gas. If the proposed demolition cell is not approved, additional gas extraction wells will be installed to see if the contamination dissipates. Potential contamination in Rice Lake drainage. Very low levels of VOCs have been detected in Rice Lake, which is the swamp to the west of the landfill. Rice Lake drains to Tibbits Brook, which in turn empties into the Elk River and Lake Orono. There is no reason for alarm at this point. The type and levels of VOCs found could possibly be naturally occurring. Staff and the landfill will be further researching this issue. Lysimeter check. Liquid and VOC contamination has been detected in the secondary containment for the landfill's leachate collection tank. The landfill believes it is caused by landfill gas and moisture contained in the clay used for the secondary containment. Additional work will be done to verify this theory. The landfill is trying to convince MPCA to use volume to determine if there is a leak in the leachate collection system (e.g. 1,000 gallons put in the tank, a 1,000 gallons remain, no leak). Staff agrees with this approach. Testing at Old City Dump. The results of testing at the Old City Dump are consistent with past years. No trend up or down can be determined. These results are still below action limits where clean up is required and logical, however, staff is recommending we continue test to be safe.