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I I 1 Council Meeting Minutes April 28, 1992 Page 4 Council Business. continued Proper said if Oakwood was built up higher than 7th Street, the runoff would-continue east in the gutters to the low point and overflow the sidewalk and run into the ditch system, Williams asked if there is a stormwater system located in front of the church. Proper confirmed there is no system. City records show a storm sewer was proposed 20 years ago. but was denied, In order for a new system to do an adequate job, it needs to run as far west as 23rd Avenue. Proper guessed that such a project would cost in the area of several hundred thousands dollars. Proper noted that the Twin Cities Army Forcemain Sewer on 7th Street between 19th Street and 23rd Street is a 24 inch pipe and would make a good storm sewer if the City took it over. However. the Army has not propo~ed abandonment until 1994. Gunderman asked the feasibility of a bridge grate with a pipe that runs into the ditch. Proper said a vein grate could be installed across 7th Street and connect into the existing storm sewer. Under ideal conditions, it would intercept most of the water. but there may be problems with debris plugging the grate. A vein grate would cost in the range of $15.000. and is a temporary solution. Proper feels it is difficult to recommend the storm sewer installation of a major storm sewer system at this time. when the forcemain sewer will be available in 1994. Oakwood Drive as it approaches 7th St. is steep and elevating the road causes driveways to become inaccessible. Benke said Vl!ith the vein grate reducing runoff coupled with the additional pond, runoff will be decreased and lessen the stormwater going into the backyards. Proper and the church's engineers worked to insure the area going to the backyards was not increased. Benke said the retention pond is not a permanent pond, but allows water to slowly flow out, Gunderman asked that since the plan did not increase flow to backyards, would water ,problems be eliminated. Proper said a major slope will always cause runoff to the backyards. A 7th Street storm sewer would take water from 7th Street, but there would still be drainage into the backyards. Williams asked if the northeast pond could overflow. Proper said the pond's outflow can be set so the pond would not overflow. He feels it is better to retain the water in the pond and release it at a slower rate. Larson asked if a curb built along the east of the parking lot would allow water flow southward, Proper said the site does not allow flow southward. Mattila said the curbing is damaged. and the plan includes installing a six inch concrete curb throughout the parking and drive areas, Council Business Christ the King Addition Report 92-097 Resolution 92-043