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2004-07-21 Final Plat Review ~ SEH MEMORANDUM TO: Larry Kruse Albertville City Administrator FROM: Robert Moberg Project Manager DATE: July 21, 2004 RE: 2004 Towne Lakes 5th Addition Final Plat Review Albertville, MN SEH No. A-ALBEV 0417 14 On behalf of the City of Albertville, SEH reviewed the final plat, proposed construction plans, landscaping plans, grading plans, and drainage calculations for Towne Lakes 5th Addition. We have the following comments for the developer: Plat 1. 68th Street between CSAH 19 (Labeaux Avenue) and Linwood Drive will not be platted at this time. Platting of the street must occur prior to development of Outlots D and F. 2. Curve radius information must be shown for 68th Street between Linden Street and Lakewood Drive. 3. Temporary easements for drainage purposes should be secured on the north ends of Linden Street and Lakewood Drive. Both streets are intended to drain northerly from 68th Street, but storm sewer will not be installed until Outlot A is developed in the future. Temporary drainage basins will need to be created off the ends of the streets to hold stormwater runoff. Construction Plans 4. Identify the extent of trail construction in the vicinity of Blocks 6 and 7 to be included with this project (Sheet 2). 5. Storm sewer structures 62A, 70, 78, and 80 may need to be increased in size from 54- to 60-inch diameter, as the larger diameter is considered to be a standard manufactured size (Sheet 2). 6. Furnish and install an additional gate valve on the northerly leg of the proposed tee at the intersection of Lakewood Drive and Laurel Street (Sheet 3). 7. Adjust water main profile in Lakewood Drive from Station 5+67 to Station 9+00 so there is a single high point in the main at the proposed hydrant location. By doing so, the hydrant can be used as an air release device (Sheet 3). 8. Installation of sanitary sewer in Lakewood Drive will be approximately 15 feet below the lake levels of Mud Lake and School Lake, requiring extensive dewatering. Management of the pumped groundwater will need to be incorporated into project construction. Special pipe bedding material will likely be required to stabilize the pipe foundation. To prevent piping of groundwater along the outside of the sewer pipe, place water stops at 300-foot intervals along the pipe (Sheets 3 and 4). 9. Change proposed hydrant installation at the north end of Lakewood Drive from a temporary to a permanent installation (Sheet 4). 10. Adjust water main profile in 68th Street so the high point coincides with the hydrant location at Linden Street (Sheet 5). Short Elliott Hendrickson Inc., 1200 25th Avenue South, P.O. Box 1717, St. Cloud, MN 56302-1717 SEH is an equal opportunity employer I www.sehinc.comI320.229.4300 I 800.572.0617 I 320.229.4301 fax 2004 Towne Lakes 5th Addition July 21, 2004 Page 2 11. Furnish and install an additional gate valve on the north leg of the tee at the intersection of 68th Street and Lancaster Way (Sheet 5). 12. Increase the length of DIP sewer pipe extending westerly in Laurel Street from manhole 502 in Lakewood Drive to 30 feet (Sheet 6). 13. Move hydrant on the north side of 68th Street at Linwood Drive around the comer onto Linwood Drive, so it can be used to flush the end of the main proposed for this phase of development (Sheet 7). 14. Install an additional hydrant on the south end of Linwood Drive (Sheet 7). 15. Place catch basin lead for CB-64 at a minimum slope of 1.0% (Sheet 8). 16. Drainage from Lakewood Drive north of 68th Street must be collected (Sheet 9). 17. Drainage from Linden Street north of 68th Street must be collected (Sheet 9). 18. Lengthen the vertical curve in the vicinity of Station 7+00 on 68th Street to 90 feet (Sheet 10). 19. Lower catch basin lead from CB-67 to avoid interference with structural section of the street (Sheet 10). 20. Elevation of the proposed storm sewer crossing in the vicinity of Station 13+50 on 68th Street must be shown in the storm sewer profile (Sheet 10). 21. Increase vertical curve lengths in Laurel Street to 90 feet (Sheet 11). 22. Place catch basin leads for CB-72 and CB-74A at a minimum slope of 1.0% (Sheet 11). 23. Move CB 72 from Lancaster Way to 68th Street to improve drainage collection (Sheet 11). 24. Place catch basin leads for CB-79, CB-81, and CB-84 at a minimum slope of 1.0% (Sheet 12). 25. Label CB-56 on the plan for Laurel Street (Sheet 13). 26. Pipe classifications for HDPE storm sewer must be shown (Sheets 13 and 14). 27. Place catch basin lead for CB-60 at a minimum grade of 1.0% (Sheet 13). 28. The pipe profile between CB-53 and CB-59 should be redone to reduce the pipe velocity between CB-53 and STMH-58 (Sheet 13). 29. Place drain tile 50 feet each side of low point catch basins and 25 feet on the upstream side of all catch basins (Sheet 15). 30. The intersection of 68th Street and Linwood Drive should be considered for a 4-way stop condition. Additional stop signs would then be required (Sheet 16). Landscaping Plan 31. Under terms of the Developer's Agreement, a 2-year warranty period is required for all landscaping items. 32. Landscaping for Outlot D can only be approved as part of an overall park plan, which the developer has yet to submit to the City for review. Grading Plan 33. Lot 10 of Block 5 is labeled as both a lookout and a rambler-type dwelling. If it is to be a lookout, the elevation of the lowest opening must be at least 18 inches above the emergency overflow elevation of the backyard drainage swale. 34. Lot 4 of Block 7 is proposed as a walkout. Adjust backyard grading to accommodate a walkout. 35. Indicate minimum setback distances on the typical building sections. 36. Developer shall verify that onsite wetland filling and mitigation is consistent with previously approved plans. Drainage Calculations 37. It appears a portion of the future townhome area north of 68th Street will be drained through the system in this development. The drainage calculations need to account for this additional drainage area. The additional drainage may result in changes in pipe sizes and/or slopes for the development. 38. Times of concentration for the system between CB-57 and CB-52 are not consistent with the time of concentration for the larger system.