| Review Type |
Outcome |
Est. Completion Date |
Completed |
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Engineering Review
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Approved with Conditions
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07/30/2018
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07/24/2018
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Gene Williams, P.E.
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Engineering Review
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No Comments
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07/19/2018
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07/19/2018
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Gene Williams, P.E.
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Engineering Review
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Corrections
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05/02/2018
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05/02/2018
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Gene Williams, P.E.
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Corrective Action Required
The Street, Stormwater, Master Drainage Plan, and Erosion and Sediment Control Plan are showing the street grade along SW River Run Dr. at 9%. This slope exceeds the allowable slope specified in the Design and Construction Manual for a Residential Collector street. This will have an affect on the design of the sanitary sewer, and hence, resubmittal is required.
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Engineering Review
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Corrections
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04/17/2018
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04/10/2018
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Gene Williams, P.E.
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Corrective Action Required
It appears that proposed manhole A-1 is existing City manhole #51-003. The F/L in and out elevations are greater than 2 feet difference in elevation, and a drop manhole should be constructed if using these incoming flowline elevations. Alternatives may be deepening the incoming sanitary sewer, provided that the depth of cover requirement or maximum slope is not exceeded. This item was caught during a final QA/QC check of the plans, and must be corrected.
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Engineering Review
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Corrections
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04/09/2018
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04/02/2018
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Gene Williams, P.E.
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Corrective Action Required
Sheet 5: A note is provided concerning the abandonment of the private school connection. The note refers the user (i.e., contractor and inspector) to the Design and Construction Manual). The specific method for abandonment must be shown on the plans rather than referring the user to a document that might not be on-site, or may not be available in the field. If the line is being abandoned in place, then the following action should be performed: 1) the private sewer line connection at the manhole must be abandoned by plugging the incoming line with a 1-foot thick plug of non-shrink grout sealed with a Portland cement grout, and 2) the opposite end must also be plugged as described above. Please provide specific notes on the plans concerning this procedure.
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Corrective Action Required
Sheet 5: Two sanitary sewer manholes are shown within pavement, as allowed by discussions with Water Utilities. These two (2) manholes within pavement must be flush with the surface, and include an 8" thick square-shaped cap of KCMMB concrete, one (1) foot around the manhole frame and lid, with a final 2" layer of surface course asphaltic concrete. The 8" thick cap must extend a minimum of one (1) foot beyond the trench, to provide a "bridging" support. The KCMMB concrete should be constructed with deformed #5 bars around the manhole frame and lid. This method will ensure a frame and lid with long-term resistance to settling. Please provide a plan and section view showing this method of construction on the street, stormwater, and Master Drainage Plan, but provide specific references in the sanitary sewer plans concerning this feature (e.g., a note is sufficient, referencing the construction of KCMMB diamonds around the frame and lids, see Street, Stormwater, Master Drainage Plan for details).
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Corrective Action Required
Sheet 5: The private sanitary sewer service for Lot 5 is too close to the outside of the manhole. Four (4) feet minimum distance is required.
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Corrective Action Required
Sheet 4: The general overview sheet is showing "SAN LINE A" pointing to the unapproved route for the sewer. Please correct, and show the correct route of SAN LINE A. Also, correct the STM LINE A label in the lower left hand corner of the sheet (i.e., should be SAN LINE H?).
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Engineering Review
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Corrections
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03/07/2018
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03/09/2018
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Gene Williams, P.E.
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Corrective Action Required
The waiver request is in progress.
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Corrective Action Required
Please refer to comment #9 contained in the previous comment letter dated Feb. 22, 2018. Manhole B-1 is still shown as an existing manhole. This is a new drop manhole, and the City does not want any misunderstandings in the field concerning this new structure. Please remove "existing" from the note.
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Corrective Action Required
Please refer to comment #11 contained in the previous comment letter dated Feb. 22, 2018. A trenching and backfill detail is provided, but may not comply with Section 2102.4.G, H, I, and J "Excavation, Trenching, and Backfilling for Pipe and Structures" contained within the Design and Construction Manual. The typical sections provided in the revised plans do not show the trench width, and this will be critical in the design of the trench backfill within right of way. Please see Section 2102.4 for specific requirements. Ensure the bedding material complies with the requirements contained in this section.
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Engineering Review
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Corrections
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02/23/2018
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02/22/2018
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Gene Williams, P.E.
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Corrective Action Required
The sanitary sewer alignment does not follow the approved Preliminary Development Plan dated Feb. 5, 2017. Although the exact location may be changed to an extent, the alignment shown in the vicinity of Lots 1 through 12 are significantly different. The sanitary sewer is shown in a parallel arrangement with the existing 24" sanitary sewer, rather than along the roadway. The sanitary sewer is also shown in the rear yards, which is a violation of the Design and Construction Manual.
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Corrective Action Required
The revision sheets contain several design changes that were not reflected in the original comment letter or the "response to comments" letter. Unless major alignment changes are revised, we have been requiring that all revisions include appropriate notation (e.g., revision clouds or other appropriate methods) showing the revision, the date of the revision, and other notes indicating what was revised. The problem that we have in reviewing these re-submittals is that revisions are made in accordance with the comments, but other, non-documented changes are made without our knowledge. This has lead to a number of issues, including plans that do not meet the standards set forth in the Design and Construction Manual.
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Corrective Action Required
Several locations of future sanitary sewer extension (i.e., manholes where the sanitary sewer will be extended in the future) now show stub-offs. These were not shown on the previous submittal, nor were any revision clouds provided. Stub-offs are not allowed for future extensions of public sanitary sewer. Any future extension must be core-drilled. This is a requirement of the Design and Construction Manual.
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Corrective Action Required
Sheet 5 of 10: Grading is different than the previous submittal, with no indication of the revision either by way of "revision cloud" or other means. In addition, it appears the depth of cover is slightly over the limit of fifteen (15) feet.
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Corrective Action Required
All Plan and Profile Sheets: We are recommending a large note be placed on all plan and profile sheets stating that "FUTURE SANITARY EXTENSIONS TO BE CORE-DRILLED - NO STUB-OFFS ALLOWED". The intent is to eliminate any misunderstanding on the part of the contractor when ordering manholes. In any case, if manholes are delivered to the site with the future extension holes already cast, they will be rejected by the City.
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Corrective Action Required
Sheet 5 of 10: MH A-1 F/L IN on the profile does not appear to match what is shown on the plan view. In addition, The F/L IN and F/L OUT shown on the plan view does not appear to make sense. However, please refer to comment #1 of this letter. It appears a complete re-design is warranted to ensure the plans conform to the approved Preliminary Development Plan, and the Design and Construction Manual.
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Corrective Action Required
Sheet 6 of 10: Temporary stub-offs are shown in the plan view on MH D-3 and MH B-4. As previously discussed, these features were not shown on the previous submittal, and were not documented using revision clouds or other means. However, temporary stub-offs are not allowed. All future extensions of sanitary sewers must be performed by core drilling into the existing manhole, and connecting the pipe to the existing manhole.
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Corrective Action Required
Sheet 6 of 10: It appears there is a drop greater than allowed by the Design and Construction Manual at MH B-1. It appears a drop manhole is warranted for such a large drop.
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Corrective Action Required
Sheet 6 of 10: MH B-1 is called-out as an existing manhole, and the 24" sanitary sewer line to the northeast of this manhole is called-out as existing. This does not appear to be correct. Aren't these proposed features?
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Corrective Action Required
Sheet 7 of 10: A temporary stub-off is shown in the profile view for Line E, at MH E-3. As previously discussed, this feature was not shown on the previous submittal, nor was it documented in terms of revision clouds. Finally, temporary stub-offs for future sanitary sewer extensions are not allowed. All future sanitary sewer extensions must be core-drilled into the manhole. The City will reject any manhole brought to the site which has pre-cast holes for future extensions.
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Corrective Action Required
A trenching and backfill detail was not provided. Please be aware the MDNR will not approve plans that are missing this detail.
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Corrective Action Required
A frame detail was not provided. The lid detail was satisfactory, but the frame detail was missing. The MDNR will reject plans without these details.
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Corrective Action Required
Regarding the realignment issue discussed in comment #1, any waiver request would need to be approved by the City, and appropriate notes placed on the plans stating that a waiver has been granted. Any waiver request would need to be accompanied by a diagram showing the original alignment, the proposed alignment, the reasoning behind the revised alignment, and grading plans showing the rear-yard sanitary sewers are accessible to two-wheel drive vehicles. Appropriate clearing and grading activities would be required, with cross-slopes and running slopes adequate for access to two-wheel drive vehicles. At this time, the City cannot support such a waiver because it appears there are better alternatives than the proposed alignment. Ideally, the original alignment shown in the Preliminary Development Plan would be satisfactory, but the storm crossing feature on SW River Run Dr. may present a challenge. Other alignments, however, appear to exist which would not require a waiver to the City's Design and Construction Manual, and we would recommend this be explored.
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Engineering Review
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Corrections
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10/05/2017
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10/05/2017
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|
Gene Williams, P.E.
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Corrective Action Required
Please specify on the title these plans are for the on-site sanitary sewer system rather than the off-site sanitary sewer plans. At this time, the City has not received the off-site sanitary sewer plans.
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Corrective Action Required
Sheet 3 of 10: In addition to tablature format, please show the location of the wyes on the plan view.
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Corrective Action Required
Sheet 3 of 10: Tees are not allowed. Please revise all connections to wyes.
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Corrective Action Required
Sheet 3 of 10: Please provide the stationing and elevation of the sanitary sewer stubs.
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Corrective Action Required
Please ensure the locations of wyes do not show a direct-connect to any manhole. They must be a minimum of 4 feet from any manhole, and must be a minimum of 4 feet from any adjacent wye.
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Corrective Action Required
Sheet 4 of 10: What is the irregular feature to the southeast of Lot 22? It does not appear to be the water quality basin, so it is unclear why this is shown.
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Corrective Action Required
Sheet 5 of 10: It appears the easement is missing between Lot 6 and 7. Please show it.
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Corrective Action Required
Sheet 9 of 10: The standard details for manhole frames and lids were missing.
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Corrective Action Required
Trench checks must be installed as per SAN-1. Please add a note on the plans specifying the use of trench checks for all sanitary sewer service stubs.
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Corrective Action Required
A trenching and backfill detail was not provided.
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Corrective Action Required
Please label existing manholes with the City manhole number. The manhole just north of A-1 is 51-001. The manhole to the south of this location is 51-002.
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Corrective Action Required
Sheet 5 of 10: MH A-1 is shown what appears to be over the existing line. Please provide the flowline in/out elevations at this location. Please specify that "no doghouse manholes are allowed".
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