N4 Mullingar to Longford (Rooskey) - Phase 3 Ground Investigation Works Contract
Deadline
19 Jun
19 Jun 2025
Deadline
19 Jun
Large-scale road corridor ground investigation including boreholes, trial pits, geophysics and laboratory testing for the N4 Phase 3 scheme. Approximately 38-week programme, PSCS role included.
This tender has been awarded
- Irish Drilling Limited · 02 Oct 2025
- Irish Drilling Limited · 25 Sep 2025
Must-haves
Fail any = disqualifiedCable percussion boring capability (minimum 150mm diameter casing)
Geobor S rotary drilling capability
Trial pitting plant
CPT and geophysical survey equipment (ERT, seismic refraction)
Health and Safety documentation and Safety Risk Assessment
Can you bid?
Required certifications
- Registered Ground Engineering Professional (RGEP)
- Registered Ground Engineering Specialist (RGES)
- Registered Ground Engineering Advisor (RGEA)
- PSCS competency
Background
The contract covers comprehensive ground investigation along the N4 Mullingar to Longford (Rooskey) Phase 3 road alignment. Intrusive works include cable percussion boring at 421 locations (to 30m), Geobor S rotary coring at 201 locations (102mm cores), and trial pits at 1,204 locations (to 4.5m). In-situ testing includes SPTs, CBR (200 no.), hand vane tests (2,619 no.), and permeability tests. Geophysical surveys include ERT and seismic refraction along approximately 21,000 lin.m combined (road centreline and 31 bridge structures), borehole televiewer logging (7 holes), and utility detection (3,800 m2). Sampling covers disturbed, bulk, undisturbed, groundwater, and contamination samples. Laboratory testing includes classification, chemical/electrochemical and strength tests. Deliverables include factual GI report, geophysical report, AGS data files, core photographs. Contractor must act as PSCS and manage traffic.
What this involves
Cable percussion boring, Geobor S rotary coring, trial pitting, geophysical surveys (ERT, seismic refraction, televiewer), in-situ testing, sampling, laboratory testing, factual GI reporting, PSCS role, traffic management.
Scoring
Lots (1)
Provision of ground investigation services including drilling, sampling, geophysical surveys, and reporting.
Documents (3)
N4_BoQ.xlsx
38.6 KB · Pricing / BOQ / Schedule of Rates
N4_Geophysics_Profile_250514.dbf
2.8 KB · Drawing / Plan / Layout
N4_Geophysics_Profile_250514.prj
387 bytes · Drawing / Plan / Layout
Original notice text
The proposed works consist of the construction of a new dual carriageway between Mullingar in County Westmeath to Tomisky (south of Roosky) located in County Longford, a total of approx. 52km in length. The proposed new carriageway will predominantly comprise new offline construction. Reuse of the existing N4 carriageway is proposed at the northern and southern tie ins. The new offline construction will be predominantly located in agricultural land. Works will generally involve earthworks, structures, pavements and drainage works. The purpose of this ground investigation is to establish the ground profile across the site to produce a robust and comprehensive “Factual Report” on ground conditions (including contamination) and inform the design of the following: The total length of the scheme comprising 52km including cuttings and embankments 37no. structures along its length ranging between small single to three span bridge structures Side roads including roundabouts for proposed structures Sustainable urban drainage system (SuDS) including 33no. ponds Of primary interest is the nature and thickness, and engineering parameters of soils and bedrock.
AI analysis updated 4 months ago
Deadline
19 Jun
Buyer
Westmeath County CouncilLocation
N4 national road corridor, Mullingar to Longford (Rooskey), Phase 3 alignment
Procedure
Open
Clarification
12 Jun 2025
eTenders ID
5631877
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