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CASE <br /> <br />GRADING AND FILLING PERMIT FOR JOHN PETERSON <br /> BY: Steven J. Jankowski, City Engineer <br /> <br />Background: <br /> <br />Mr. John P0terson owns the Northeast Quarter of the Northeast Quarter of Section 9 and <br />claims acces~ to the property through an approximate 1600 foot easement located in the <br />Southwest Quarter of the Southwest Quarter of Section 3. An access existed along this <br />easement since 1989, however in October of 1996, Mr. Pederson widened and leveled the <br />road surface; by utilizing borrow material from his property. No preconstmetion cross <br />sections are available, and the current frozen conditions do not allow inspection of the fill <br />material to determine the amount placed. However, the current roadway is approximately <br />20 to 21 feet: wide and it appears that the amount of fill placed varies from a couple of <br />inches to as much as two feet. <br /> <br />In addition, tlae road improvement resulted in the blockage of a 12-inch cormga .?d. plastic <br />culvert which accommodated the west to east drainage across the roadway. A mmmg and <br />grading permit would be required because of the impact or the existing drainage. <br />Additionally it permit may also be required if the amount of fill exceeds 400 cubic yards. <br /> <br />Observations: <br /> <br />Accommodation of the natural drainage appears to be the most significant concern with this <br />activity. HoW. ever, stabilization of both the fill and borrow areas are concerns of the city <br />~mining and limding ordinance. Since a portion of the filled area is classified wetland, <br />compliance v~ith the Wetland Conservation Act is an additional concern. DNR has been <br />contacted and!a cease and denial order has been issued. The'filling has been reviewed by <br />the Anoka Soft Conservation District and a determination of violation will be made shortly. <br />Remedying a!violation is the responsibility of the Lower Rum River Water Management <br />Organization. <br /> <br />A site visit was conducted on November 21, 1996. The west side of the road culvert had <br />been located ~nd excavated by the applicant previous to this visit. The water surface was <br />measured on both sides of the culvert, and it was found that water surface was 12 inches <br />higher on the iupstream side of the culvert. The ice surfaces On both sides of the culvert <br />were also meaSured and found to be approximately 18 inches higher on the upstream (west) <br />side. Further ~tisual inspection of the culvert from the down stream side using a flashlight <br />found the culyert to be collapsed 7.5 feet from the downstream side. Upstream, ponded <br />water from th~ heavy rains a week earlier are most likely permeating through the sandy <br />roadway which acts as a levee. Another 18-inch corrugated metal culvert, located less than <br />100 feet downstream, was observed to be flowing. <br /> <br />Recommendations: <br /> <br />Staff recommends that the following conditions be placed on the issuance of a mining and <br />grading permit, for the activity: <br /> <br />1. The applic,ant be required to re-establish natural drainage by replacing the existing 12 <br /> inch culve/'t, with a 15 inch smooth interior culvert. The culvert shall include a flared <br /> end secfio~ on the upstream side to enhance flow characteristics. The culvert shall be <br /> set no greater than 0.1 'feet higher than the invert of the downstream, corrugated, metal <br /> pipe culve~. The culvert material may be polyethylene, but it shall conform to class ! <br /> <br /> <br />