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2005-05-27 Review of Final plat, Street, and Uitlity PlansBO L—TON a#- M F:= N K , i NC_ Consulting Engineers & Surveyors 2638 Shadow Lane, Suite 200 • Chaska, MN 55318-1172 Phone (952) 448-8838 • FAX (952) 448-8805 May 27, 2005 Mr. Dwight Gunnarson, EIT, Project Engineer Meyer-Rohlin, Inc. 1111 Hwy 25 North, Suite 205 Buffalo, MN 55313 RE: Review of Final Plat and Street and Utility Plans Hunter's Pass Estates City of Albertville Dear Mr. Gunnarson: We have reviewed the final plat and the street and utility plans prepared by Meyer-Rohlin, Inc. dated May 18, 2005. Please be advised that these comments are in addition to the letter dated May 18, 2005, for grading and preliminary drainage calculations. Based on our review we offer the following comments: FINAL PLAT: The width of the right-of-way to be dedicated as 70th Street N.E. is incorrectly labeled as being 60 feet wide instead of 70 feet wide. Adjacent plats and their names must be shown. The plat must indicate the date of the Mud Lake's shoreline location, the water elevation on that date and a benchmark. The dimension for the boundary of Outlot C, from the right-of-way line of 70`h Street N.E. to the most northerly corner of Outlot E is not shown. Unless all plat monuments are going to be set prior to recording the plat, a statement of delayed monument staking should be added to the Surveyor's Certification. If monuments are in -place at the northwest and southeast corners of the plat, they should be shown and labeled. SHEET 2 of 13: Revise street names to match the proposed names on the plat. Plat shows 67th Street NE not 69 h Circle NE. Any and all revisions to the plan and profile sheets must be reflected on this master plan. Label all street names around this project. F:\ALBVU1521657\corres\Hunter's Pass Review 052705.doc MANKATO, MN • FAIRMONT, MN • SLEEPY EYE, MN • BURNSVILLE, MN • WILLMAR, MN • CHASKA, MN • AMES, IA www.bolton-menk.com An Equal Opportunity Employer A note should be added indicating all construction shall conform to the City of Albertville Standard Specifications and details. Revise note No. 5 to match the plans and details of 5'. SHEET of13: Show watermain starting at Station 0+84 on the profile view. Label the stationing on the lower portion of the profile. Label all pipe crossings in the profile view with size and type of pipe. Modify MH 103 to reflect correct manhole depth and inverts as shown on Sheet 5. The sewer lines from MH 301 and 201 must be modified to match near the invert of the manhole or an outside drop must be designed. Label all inverts for the manhole. The service location for Lot 21, Block 6 is too close to the manhole. Revise the service location for Lot 19, Block 6 to avoid the hydrant. The service ending locations for Lot 1-3, Block 6 need to be reviewed due to the location of the proposed concrete walk. The walk will be impacted when the service is connected during the home construction. Clarify the watermain connection at Station 14+70 to show what exists and what is proposed. It appears an 8" gate valve may be proposed or might be existing. Label existing and proposed on the profile view. Label the offset location of MH 305 in the profile view. Label the top of watermain pipe elevation needed to provide a minimum of 18" of clearance between the proposed storm sewer at Station 5+20. The top of watermain elevation should be 953.9 or lower. SHEET 4 of 13: Revise MH 105 label on the plan view to match the profile view. Modify MH 105 to reflect correct manhole depth and inverts as shown on Sheet 5. The sewer lines from the other manholes must be modified to match near the invert of the manhole or an outside drop must be designed. Label all inverts for the manhole. Label all pipe crossings in the profile view with size and type of pipe. Revise the elevation labeling for the profile view of Lydia Circle NE by 5 feet to match the correct elevation grid. Label the top of watermain pipe elevation needed to provide designed elevations. Label the top of watermain pipe elevation needed to provide a minimum of 18" of clearance between the proposed storm sewer crossing at Station 4+50 Lakewood Drive. It appears the top of pipe should be 848.8 or deeper. Show forcemain connection to MH 604 in the profile view. Show the storm sewer crossing just west of MH 604 in the profile view. F:\,kLBV\T1521657\corres\Hunter's Pass Review 052705.doc SHEET 5of13: Label the 72" Arch pipe on the plan view. Modify the 12" RCP crossing at Station 13+45 to match the elevations on Sheet 8. Label the top of watermain with elevations and stationing to achieve the required depth. Show CB 500 in the profile view. The watermain and insulation is directly beneath this structure. Label the top of watermain elevations to achieve the minimum 18" separation. Show all insulation in the plan view. Label all pipe crossings in the profile view with size and type of pipe. SHEET 6 of 13: Provide a profile view of the proposed watermain across Outlot C. Label the 72" Arch pipe on the plan and profile view. Draft the pipe correctly in the profile view (54" high). Label the proposed top of watermain elevations near the 12" RCP crossing at Station 15+00 and the crossing at Station 13+45. Show all insulation in the plan view. Label all pipe crossings in the profile view with size and type of pipe. Clarify the watermain offset in the profile view near Station 15+25. Label the watermain location and fittings needed from Station 13+00 to Station 14+00. Label the 7.5' min. cover in the profile view near Station 20+00. SHEET 7 of 13: Provide stationing in the plan view for the forcemain. Show ME 604 in the profile view. Per Sheet 4 the rim appears to be 5 feet higher than the proposed ground, and the invert appears to be 2 feet higher than the location of the forcemain. The proposed forcemain shown will not work with the designed inverts of MH 604. It appears the forcemain will be very shallow from Station 0+40 to Station 3+50. Insulation and/or a re- design must be considered. Show the proposed watermain crossing in the profile view at Station 3+65 to avoid potential conflicts. Show the 18" HDPE crossing in the profile view at Station 8+70 to avoid potential conflicts. Label all existing and proposed pipes in the plan view. SHEET 8 of 13: Label all vertical curve information for all vertical curves. Label all design slopes with percents. Label all structures that appear on each plan sheet with numbers. F:\ALBV\T1521657\corres\Hunter's Pass Review 052705.doc Provide detailed information for the cul-de-sac such as drainage arrows, slopes, top of curb elevations, radius information, etc. to ensure it is constructed properly. Label the width of the street within the cul-de-sac. It appears this street is not shown at 28' back to back. It appears the 24" storm sewer pipe from CB 405 needs to be extended 30 additional feet to avoid a conflict with the proposed sidewalk. Note size and amount of rip -rap for this pipe. Label all sidewalk and label location of all proposed pedestrian curb ramps. Label all streets in the plan view. SHEET 9 of 13: Label all vertical curve information for all vertical curves. Label all structures that appear on each plan sheet with numbers. Provide detailed information for the cul-de-sac's such as drainage arrows, slopes, top of curb elevations, radius information, etc. to ensure it is constructed properly. Label the width of the street within the cul-de-sac. It appears this street is not shown at 28' back to back. Label the proposed pipe from CB 106 to A 100 in the profile view. Label all sidewalk and label location of all proposed pedestrian curb ramps. It appears the sidewalk is proposed to be installed on or behind the right-of-way near Station 1+50. A separate document for this sidewalk should be submitted. Drainage and utility easements are not intended to be used by the public for walking purposes. Label all streets in the plan view. SHEET 10 of 13: Provide a plan and profile sheet for the proposed storm sewer from CB 505 to E 100. Label all rip -rap in the plan view. Label the proposed pipe from CB 107 to G 100 in the profile view. Label all sidewalk and label location of all proposed pedestrian curb ramps. It appears the sidewalk is proposed to be installed on or behind the right-of-way from Station 5+00 to Station 10+00. A separate document for this sidewalk should be submitted. Drainage and utility easements are not intended to be used by the public for walking purposes. Label all streets in the plan view. SHEET 11 of 13: Provide profile view of the proposed 72" Arch RCP. Show all proposed easements in the plan view on all sheets. Label the 72" Arch pipe on the plan and profile view. Draft the pipe correctly in the profile view (54" high). F:\ALBV\T1521657\corres\Hunter's Pass Review 052705.doe It appears the invert for FES C100 should be 950.04. It appears the outlet invert for 72" RCP should be 949.4. Label all sidewalk and label location of all proposed pedestrian curb ramps. Provide detailed information for the cul-de-sac's such as drainage arrows, slopes, top of curb elevations, radius information, etc. to ensure it is constructed properly. SHEET 12 of 13: It appears most of these details do not match the City of Albertville Standard Detail Plates. Revise to conform to City Standards. We will provide a copy of the City Standards if needed. SHEET 13 of 13: It appears a few of the cul-de-sacs are proposed to include a street less than 28' back to back. We need to discuss what width is appropriate. The proposed Pedestrian Curb Ramp (Handicap Ramp Detail) must be in compliance with current MnDOT/ADA Standards (Truncated Domes). MISC. COMMENTS: Show all proposed easements in the plan view on all sheets. Several Streets contain cul-de-sacs. Please verify that the geometry of each cul-de-sac is sufficient to accommodate a school bus and fire truck design vehicle. The center islands of some cul-de-sacs may need to be reduced to allow for a wider travel lane. Due to the anticipated traffic patterns and the widths of the streets, we recommend the proposed curb/bit radii at the major entrance locations to the development be increased to 35 feet. To improve the connectivity of the pedestrian facilities, connections from the sidewalk to street intersections with pedestrian ramps will be required. All watermain fittings, valve boxes, and hydrants shall be wrapped in polyethylene encasement material. Tracer wire for the purpose of locating the main will also be required. These items will need to be noted on the plans. During final design, it will be necessary to modify the sanitary system to eliminate manholes at high points with two outlet pipes. Stubs may need to be added or lengthened to serve the ultimate future service areas or additional looping of watermain within the development may be desirable. Please submit an overall utility plan to assist in this review / determination. It appears that no oversizing of municipal utilities to accommodate future nearby developments will be necessary. 7.5 feet of cover is not achieved at some watermain and forecmain locations. Please verify that the forcemain location at Block 3, Lot 6 is contained within the utility easement. Consider shifting the bend to the north. F:\ALBV\T1521657\corres\Hunter's Pass Review 052705.doc All watermain final design will require review on a per phase basis with final construction plans. This includes valving and hydrant spacing. For informational purposes, hydrant spacing will generally be 300 feet and valving will be required such that no more than 20 units will be vulnerable to a single watermain break or shutdown. Final hydrant and valve spacing and locations shall be reviewed by the Fire Chief and Public Works Department. Standard storm sewer castings are type R3067-V. A 15-foot transition between the proposed surmountable curb and the CB casting is recommended as per City standards. All 12-inch storm sewer shall be Class 5. All 15-inch storm sewer shall at least be a Class 4. The remaining storm sewer lines may be a Class 3 depending on the amount of cover. Please evaluate and modify the storm sewer schedule accordingly. This concludes our review of the materials submitted for the proposed Hunter's Pass Estates Development. We will be available to dicuss the items contained herein at your convenience. Please contact me if you have any questions. Sincerely, BOLTON & MENK, INC. cojdz� 4444A-10—p Mark D. Kasma, P.E. Albertville City Engineer Cc: Larry Kruse, City Administrator Al Brixius, City Planner Michael Couri, City Attorney Dan Faulkner, P.E., BMI F:\ALBV\T1521657\corres\Hunter's Pass Review 052705.doc