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Zoning File #1393 <br />April 12, 1989 <br />Page 2 of 2 <br />Cook advises that he would like a more detailed plan for the erosion <br />control noting that the silt containment fencing is appropriate, but <br />because of the proximity of the drainage ditch to the east that drains <br />directly into the watershed of Long Lake via the railroad track that <br />precautions may be necessary during the aeration phase. Soil samples will <br />be collected and analized prior to the thin spreading and conducted monthly <br />throughout the entire thin spreading process for approximately a period of <br />90 days. The aeration process consists of the exposure to air of the top <br />surface followed with the monthly field disking. Upon satifisfaction that <br />contaminates no longer remain in the soils, the area will be reseeded and <br />returned to original state. <br />Based on the March 1, 1989 report of Delta Environmental, the first <br />phase of the recovery program appears to be most successful. Contaminated <br />ground water appears to be channeled into the treatment area. Contaminate <br />concentrations are low and if the trend continues, WSI may be allowed to <br />discharge directly into the sanitary sewer system rather than through the <br />monitoring ^eatment chambers. <br />Staff will recommend approval of the conditional use permit for <br />Washington Scientific Inc. to allow the second phase of the recovery <br />program consisting of the thin spreading of approximately 800 cubic yards <br />of contaminated soil over a two acre area on the property subject to the <br />following conditions: <br />1. PCA pei-mit approving the thin spreading technique as proposed by <br />Delta Environmental Consultants Inc. <br />2. Erosion control plan subject to the City Engineer's final review <br />and amendment. The City Engineer to address any special precaution cr <br />improvement necessary to prevent contamination of drainage into the <br />Long Lake watershed. <br />3. The City of Orono to receive the results of the soil sampling <br />performed during the period of air stripping/aeration. <br />The Planning Commission may wish to add other conditions.