9247 Addendum 2.pdf
PDF 279 KB Posted
- Solicitation number
- EN-2022-9247
- Issued by
- Wisconsin
About this file
This is Addendum No. 2 to Contract No. 9247, issued by the City of Madison, Wisconsin Department of Public Works Engineering Division on November 2, 2022, for a topographic survey at Old Sauk Trails Business Park covering approximately 34 acres. The project requires topographic mapping of greenway features including elevations, existing utilities, bathymetric data, and trees exceeding 3 inches in diameter, along with significant street features and property features such as iron pins, easements, and right-of-way boundaries. The addendum provides clarifications on survey methodologies, including specifications for determining sediment depth using single beam sonar with a minimum 1% accuracy specification, spot-checking sediment depths using rod methods, and surveying pond bottoms through available data sources. All trees at project locations will be tagged, and if wetland delineators have marked wetland limits, the delineated areas shall be surveyed and included in deliverables. The contractor is required to review existing data files provided by the City and collect any missing data elements not included in the original file, with the understanding that items such as below-water data, pipe sizes, and wetland flags may be absent from existing documentation.
The addendum clarifies that a full proposal is not required from bidders; only the completed bid form is necessary unless contractors plan to deviate from requested efforts or qualifications. Contractors unable to provide lump sum pricing for work with unknown scope due to incomplete existing data may request Time and Materials contracts with a "not to exceed" limit, as the City's systems require an upper cost boundary. The survey shall extend at least 50 feet beyond project improvements and include minimum coverage of one upstream and downstream structure and culvert ends for both storm and sanitary sewers where present. Additional deliverables now include a detailed report outlining bathymetric survey data collection methodology, benchmark locations, equipment specifications, water surface elevation readings, data collection and processing methods, and results, with an example report provided for reference.
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Other files
| File | Type | Posted |
|---|---|---|
| 9247 RFB.pdf | ||
| 9247 Addendum 1.pdf |
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Text version
Department of Public Works
Engineering Division James M. Wolfe, P.E., City Engineer City-County Building, Room 115 210 Martin Luther King, Jr. Boulevard Madison, Wisconsin 53703 Phone: (608) 266-4751 Fax: (608) 264-9275 engineering@cityofmadison.com www.cityofmadison.com/engineering
November 2, 2022
NOTICE OF ADDENDUM
ADDENDUM NO. 2
CONTRACT NO. 9247
TOPOGRAPHIC SURVEY AT OLD SAUK TRAILS BUSINESS PARK
Revise and amend the contract document(s) for the above project as stated in this addendum, otherwise, the original document shall remain in effect.
RESPONSES TO QUESTIONS RECEIVED:
Question: Item 20 asks for the depth of water and sediment. Is this asking for the top of sediment elevation and the hard bottom elevation?
Answer: To the best extent possilble, determine sediment depth based on the below.
Top of sediment may be determined using single beam sonar with control points verified by the City of Madison.
The City of Madison hosts Madison GPS Base as part of the WDOT GNSS reference station network. More information is available: https://www.cityofmadison.com/engineering/developers-contractors/surveyor-toolkit
Sediment depths using sonar shall determine top of sediment, and shall be spot checked using rod method.
Bottom of pond depths shall be determined by the surveyor using best available data by evaluating sediment core logs (provided by the City), plan designs (provided by the City), and field confirmation using rod method where to survey through sediment to try to determine pond bottom elevation. Equipment for sonar shall have a specification of a minimumum 1% of measured depth accuracy.
Question: Can you confirm if the trees will be tagged on either of these projects?
For all locations, trees will be tagged.
Question: For submitting on the Pheasant Branch Greenway topo survey, are you only looking for the bid form on the last page submitted? Or are you looking for a full proposal with company info, past projects, staff, etc.?
A full proposal is not necessary for any company intending to do what is listed in the Request for Bids.
The additional language is meant for those that plan to deviate from the requested effort or qualifications.
Understanding the above, only the completed bid form is required.
Question: Under the section of General Survey Requirements:
Item No. 17: The City will be hiring a wetland delineator to mark the limits of wetlands on this project. If flags are present, the delineated wetland shall be surveyed and included in the deliverables.
The work is complete.
Question: Under the section of General Survey Requirements:
Is this work completed so it can be surveyed in Deliverables Part 1? If not will it be completed by April 15, 2023 in time for inclusion in Deliverables Part 2?
The work is complete.
Question: Item No. 22: In the area designated “Existing Topographic Extents”, the Contractor shall review the data file provided and collect any data on the above list that is not included in the data file provided.
Can you provide us a list of items missing from that work so that we can determine the effort needed to
Deputy City Engineer Bryan Cooper, AIA
Gregory T. Fries, P.E.
Chris Petykowski, P.E.
Deputy Division Manager Kathleen M. Cryan
Principal Engineer 2 John S. Fahrney, P.E.
Janet Schmidt, P.E.
Principal Engineer 1 Christina M. Bachmann, P.E.
Mark D. Moder, P.E.
Financial Manager Steven B. Danner-Rivers
11/2/2022-9247 Addendum 2.docx collect the missing information. We have no idea of the effort needed from the information in the RFP.
The file containing the existing survey data can be emailed for review or found here:
https://sftp.cityofmadison.com:443/ui/#/syncplify/share?N=nDHRxs9YVKaJoyam5Dw4Fc.
The City does not have a list, however, we understand items like below water data, pipe sizes, wetland flags, etc are missing.
Question: Alternately: Could this work be completed by time and material since we have no idea what is needed? Very hard to put a lump sum price on this item.
We can set up contracts as a Time and Materials not to exceed, but not a straight Time and Materials contract.
Our systems need that upper limit.
REVISE:
Attachment B Scope of Services:
GENERAL SURVEY REQUIREMENTS
13. The survey shall extend as least 50 10 feet beyond the improvements within the project boundary (unless there are fences/blockages not allowing access to adjacent property). For areas adjacent to streets, curb and sidewalk shall be surveyed. The Contractor shall assume that they shall survey a minimum of one structure and culvert ends (and in some instances more) upstream and downstream of the survey limits, for both storm and sanitary sewer, when they are present. Manhole inspections shall not be required with the survey work. The survey shall be of sufficient detail to collect offsite adjacent property information that may impact construction and design including signficiant trees, drainage patterns, structures, and utilities.
ADD
SURVEY DELIVERABLES
Additional report requirements.
3. Report outlining bathymetric survey data collection and equipment process including: benchmark locations, equipement, WSE readings, equipment specifications,data collection and processing method and results. An example can be found here:
https://www.cityofmadison.com/business/pw/contracts/documents/9433%20220627_SpringHarborBathy_Fin alReport.pdf
James M. Wolfe, P.E., City Engineer
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