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View Enquiry: BE 2022-5014-011


Contract Details
Contract Number
2022-5014
Region
Northeastern
Tender Owner
MTO Capital
Location
From the East Junction of Sudbury Regional Road 55/SE ByPass easterly to Kukagami Lake Road for 19.5 km.
Highway
17
Length
20.06
QMS Declaration
Yes
Option A or B bidding
No
Contract Description
Grading, Drainage, Granular Base, Electrical, Hot Mix Paving
Tender Instructions
Contract Dates
Tender Advertise
30-Mar-2022
Tender Opening
11-May-2022 at 03:00:00 PM
TRF Submission Opening
13-Apr-2022
TRF Submission Closing
06-May-2022 at 12:00:00 PM

Enquiry Details
Enquiry Date
06-May-2022 at 11:27:38 AM
Type
General Conditions
Subject
Survey Requirements
Enquiry
In Tender documantion on pg. 101: "The vertical control component shall be established with reference to CGVD28" Canadian Geodetic Vertical Datum of 1928 (CGVD28) is an outdated orthometric system - it is not tied to modern GNSS systems, it does not use geoid. Today, the modern Canadian National Reference Datum CGVD2013a is already in common use in Canada. To meet strict accuracy criteria, it is preferable to use this modern CGVD2013a. If we need to meet the CGVD28 tender condition, it will be necessary to transform the resulting data to CGVD28 using HTv2, which is a Canadian elevation transformation tool. Unfortunately, there is no exact mathematical equation for the conversion and the conversion is only approximate. This may introduce errors and fail to meet the accuracy conditions, even though the actual measurement will meet the accuracy. Does MTO require the submission of results in CGVD28?

Response Details
Response Status
Completed
Response Date
09-May-2022 at 01:36:50 PM
Response
The control network must comprise CGVD28 values on new benchmarks and can be based on either: a) Existing Primary Vertical Control monuments in or near the project area, or b) If there is insufficient existing Primary Vertical Control, GNSS observations that have been suitably corrected to yield CGVD28 values, provided that they are internally consistent with 2nd order accuracy from end to end of the project. Where (b) above is the case, comparisons of old and new elevations on any existing primary or project control within the site limits shall be listed in the survey report and explained as to their goodness of fit.