Geotechnical Investigation and Laboratory Testing: The selected proposer/offeror shall provide
foundation and geologic/geotechnical exploration in accordance with the procedures, requirements
and guidelines outlined in the latest edition of the New Mexico Department of Transportation
("NMDOT") Geotechnical Design Guide ("Manual"). The geotechnical exploration and laboratory
testing shall include at least the following
1. For roadway, soil sampling and testing during construction the selected proposer/offeror shall
represent the two (2) foot prism of finished subgrade.
2. For bridge elements, one (1) soil boring and/or rock core shall be completed at each abutment and
each pier element. At the abutments the borings should be taken to a depth of eighty (80) feet. At
the piers, the borings should be taken to a depth of hundred (100) feet. Lesser depths of exploration
will be acceptable with the presence of bedrock or very dense soil strata.
3. For retaining walls, one (1) soil boring and/or rock core shall be completed every two hundred (200)
feet with no less than two (2) borings completed per wall. Borings should be taken to a depth of
twice the height of the walls.
4. For drainage or utility structures and trenches, the need for borings will be determined on a siteby-site basis.
5. Perform required lab testing and soil classifications as required by the Manual. Lab testing may
require consolidation and tri-axial testing of undisturbed samples if clay soils are encountered,
direct shear tests, or rock core point load and unconfined compression tests.
6. Perform required lab testing and soil classifications as required by the Manual. Lab testing may
require consolidation and tri-axial testing of undisturbed samples if clay soils are encountered,
direct shear tests, or rock core point load and unconfined compression tests.
7. For roadway design, the results of the borings/cores shall determine a Designated Design R-Value
for each independent project. Additionally, based on a project-by-project basis for the Owner will
determine a number of R-Values (T-190) and NMDOT Charted R-Values needed for the internal
pavement design.
8. For roadway, a recommended pavement design based on the results determined by the lab testing.
Deadline to Submit Written Questions March 27, 2023
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