09-13-07 Planning Comm. Agenda - Laserfiche WebLink

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Planning Commission September 5, 2007 Page Three 8. The location of outtall B shall be moved to the northeast corner of the east pond. 9. All utilities shall have a separation that is equal to or greater than twice the pipe depth from any proposed building pad. It appears as if the storm sewer line between Inlet Al and Inlet A2 does not have that required separation. Please review and make any revisions as necessary. 10. Maximum allowable distance between sets of catchbasins is 400 feet. Please review the storm sewer layout and add additional sets of catchbasins as necessary. Also submit the actual gutter spread for each set of catchbasins with the storm drainage calculations. Detail Sheets 1. It seems as if the pipe material proposed on the utility sheets varies from what is shown on the outlet structures' details. Please review and correct as needed. 2. It appears that the bottom elevation of the east pond is incorrect on the grading plan. The outlet structure detail and stormwater calculations both use an elevation of 871.00, while the grading plan shows an elevation of 872.00. 3. A geotechnical report for the pavement design must be provided. The pavement section should be designed based on a twenty-year life span. Lift Station Detail Sheet 1. An electrical plan and the specifications for the proposed lift station should be submitted for review. 2. A permanent on-site generator will be required for lift station operation during power failures. A standard City dialer shall also be provided for the station. stormwater Management Calculations 1. It appears as if all existing building(s) and driveways are not shown on the pre-developed conditions. Please review this and modify the stormwater calculations as necessary. 2. The drainage boundary line between Pre-West 1 and Pre-Northeast appears to be inaccurate. It appears as if the existing contours show that a larger area is draining into Pre-Northeast area and not into Pre-West 1. Please review and revise the drainage areas accordingly. 3. Pre-West 1 stormwater calculations should be routed thru Pre-West 2 since the existing drainage pattern directs the runoff from Pre-West 1 area to Pre- West 2 area. 4. It appears as if the channel flow for the areas Pre-West 1 and Pre-West 2 are located inside a wooded area. The runoff lengths are calculated using grassed conditions. Please review and make changes as necessary. Ltr-090707-PC 10062 Flanders Court NE, Blaine, MN 55449 -Phone: (763) 780-0450 -Fax: (763) 780-0452