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Mr. Harlicker • August 22, 2002 Page Two We question whether or not the communal septic system will be allowed this close to the gas lines, within the Northern Natural Gas easement boundaries. 5. A permit from Northern Natural Gas will be necessary for the 193`d Avenue crossing of the gas lines. Possibly a permit will also be needed for the construction of the communal septic system from the Northern Natural Gas Company. 6. If the communal septic system anticipates more than 10,000 gallons per day in flow, a MPCA permit will be required. For less than 10,000 gallons per day, only City review is necessary. 7. No storm sewer design calculations were provided with the revised submittal. The grading plan does show a series of five ponds in the proposed development. It appears that the concept is to hold the increase runoff in retention ponds, with outlets ultimately to a branch of County Ditch No. 28. It should be noted that the City has been discussing with Sherburne County the potential take over of a portion of County Ditch No. 28. This may result in some additional storm sewer construction through this proposed plat to drain areas further north. It may also result in some additional construction of an outlet to the Elk River south of this plat. There will likely be some financial consequences to this plat, depending on the outcome of the discussions between the City and the County regarding County Ditch No. 28. Regardless, storm drainage calculations will need to be submitted, reviewed, and approved, likely by both the City and the County. 8. We provided numerous minor comments to the developer relative to the grading plan. - There has not been sufficient time to review the revised grading plan for each of these • comments. It does appear, however, that they have made an attempt to address all of them. We will do a more detailed review as time permits and provide any additional comments to the developer relative to the grading plan. 9. The plan proposes a roundabout at the intersection of 193`d Avenue and Rawlins Street. A similar installation has previously been built in the Meadowwoods Village cluster subdivision. Care will need to be taken in the final design of the roundabout to insure that there are proper radiuses to allow for snowplow and/or emergency vehicle operation. A center island is also proposed in the Queen Circle cul-de-sac. The design of the center island will have to follow the City design guidelines, which have been laid out to facilitate snow plowing activities and emergency vehicle access. If you have any questions regarding any of these comments, please call. Sincerely, Howard R. Green Company f------- G2(�t) Terry J. GGC aurer, P.E. TJ M:sgw Ill Howard R. Green Company Ltr-082202-Harlicker[1] CONSULTING ENGINEERS