5.3. SR 07-19-2004 - Laserfiche WebLink

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department for Met Council (651-602-4701). Met Council would classify this as a shod-term discharge (lasting 2 to 3 weeks) from an out of area location. Several fees would be involved and were roughly calculated for the City of Elk River. Actual liquid sludge strengths were not available so they were assumed to be typical levels for preliminary estimates. · Permit application with $300 fee · Strength charge: Based on 25,000 mg/I of TSS (total suspended solids) and 20,000 mg/I of COD (carbonaceous oxygen demand), the cost for communities within the metro service area would be $36.00/1000 gallons. This charge would be approximately doubled since Elk River is outside of the Metro Area, which would make it $72.0011000 gallons. · The industrial load charge includes the strength charge plus a volume charge of $1.34/1000 gallons. · Out of Service Area charge of $50 per load. Loads are typically 5000 gallons. This equates to a cost of $1011000 gallons. This totals approximately $84/1000 gallons, $0.084 per gallon or $45,000 based on the estimated amount of sludge. This does not include trucking costs. The City does not have equipment available to haul liquid waste. Met Council would need the completed permit application and $300 fee submitted. The sludge strength and heavy metal concentration would need to be submitted with the permit. A letter describing the reason for discharging to Met Council would also be required. Once submitted, they would determine which plant location would be available to accept the liquid sludge. They would then write an approval form that would need to be authorized. They said the process can take up to two weeks, and that accepting sludge within two or three weeks would be possible. RECOMMENDATION It is recommended that the City select the landfill option. The estimated cost of $35,000 is very rough since several assumption were involved beginning with the amount of sludge that needs to be removed from the storage tank. The digester project contractor has been contacted and can begin temporary piping to the secondary digester July 19th. Plant staff is conducting the necessary tests required by the landfill to allow disposal and should be approved by next week. Once the sludge is approved by the landfill, the contractor that will remove the sludge and dry will mobilize equipment to the plant site. The sludge drying rate was estimated at 3000 gallons per hour. Based on an 8-hour day, this would take approximately 22 days. The City should begin emptying the tank with the least amount of sludge. That tank could then be used to hold the primary digester sludge while it is taken offline and the other tank can continue to be emptied. City staff plans to have the primary digester offiine by early August. Once the tank is empty, the digester project contractor will began removal of the existing cover. The structural damage will be assessed at this time and a change order is possible. Distribution: Gary Leirmoe, City of Elk River WWTP Lori Johnson, City of Elk River Finance Director Terry Maurer, HRG C:\Documents and Settings\jmiller. ELKRIVERPD\Local Settings\Temporary lnternet Files\OLK20\mem-071304- 3 coverproblemsl 1 .doc