Source
https://www.mpdc.govt.nz/filelink/fileman-files/News/Projects/Waitoa%20Water/Session2_Bore_drilling_advice.pdf — original source (opens in a new tab; the file is not redistributed)
Brown Bros (NZ) Ltd 100 mm water-bore quote — MPDC Waitoa community supply (Nov 2025)
The verified primary behind CR_045's borehole drilling cost (resolves RT_295)
A genuine commercial drilling quote from Brown Bros (NZ) Ltd (ref 25/26/172, 12 Nov 2025), published by Matamata-Piako DC for its Waitoa community water-supply enquiry. This is the named primary that CR_045’s headline borehole figures were spot-verified against — now filed so
params.pyborehole_drill_capexcan cite an authoritative quote directly. Waikato-alluvial-specific (screened wells in sands/pumices); high confidence there, indicative nationally.
Summary
Brown Bros (NZ) Ltd — a Waikato drilling contractor — quoted Matamata-Piako District Council for a new 100 mm-diameter community water bore at Waitoa. For the area’s typical 64 m mud-rotary bore (steel casing to ~58 m, in sands/pumices), the estimate is 21,440 excl GST**, built from standard rates: mobilisation + first 20 m **8,900, mud rotary 20–100 m 285/m**, air/tri-cone (hard rock) **305/m, plus 80 mm PVC screen 650 per 6 m and water analysis 420 each. A 100 mm bore yields up to 14 m³/hr where the aquifer allows; more volume needs a 150 mm bore or two 100 mm bores. Local groundwater is high in iron/manganese, so filtration is required. The quote excludes the submersible pump, the Waikato Regional Council bore permit ($546.25, which itself allows taking up to 15 m³/day), and site works — and taking >15 m³/day from one bore triggers a separate water-take resource consent. A second, Council-AI-generated table gives indicative (non-quote) pump/reticulation/filtration costs.
Key claims
- claim: "DRILLING RATES + 64 m WORKED EXAMPLE (real commercial quote, ex-GST, Waikato alluvial). Brown Bros (NZ) Ltd, ref 25/26/172, 12 Nov 2025, for MPDC's Waitoa community supply — Standard Drilling Rates: mobilisation to/from site + drilling 0–20 m $8,900; mud rotary drilling 20–100 m $285/m; air/tri-cone (hard rock) 20–100 m $305/m; 80 mm PVC screen $650 per 6 m length (over quoted); routine water analysis to NZ Drinking Water Standards $420/ea; drilling additives $30/kg; hole-conditioning / extra setup / water trips $350/hr; non-listed materials at cost + 12.5%; 20% non-refundable materials deposit. Worked example: a 64 m 100 mm ID mud-rotary bore (≈58 m steel casing + 6 m 80 mm PVC screen + grouting + half-day development/flow test) = $21,440 excl GST. EXCLUDES the submersible pump supply/install, the WRC bore permit, water for drilling, cuttings disposal, site access and re-instatement. Waikato-alluvial-specific (screened wells in sands/pumices)."
source_location: "p.1 Brown Bros letter + Standard Drilling Rates table; conditions §2.2 (ex-GST, 30-day validity), §2.5 (no pump allowance)"
- claim: "BORE CAPACITY + WATER QUALITY. A 100 mm/4-inch bore produces up to 14 m³/hr (≈336 m³/day) where the aquifer volume is available; if more is required, a 150 mm bore or two 100 mm bores are needed. Local (Waitoa/Waikato) groundwater tends to be high in iron and manganese, so water must be filtered — both to avoid blocking/staining pipes and fittings and, where supplied to another user, to meet NZ Drinking Water Standards. Brown Bros cannot guarantee the quantity, quality or temperature of water from any bore."
source_location: "p.1 Background section; conditions §2.6"
- claim: "WAIKATO CONSENT PATHWAY (regulatory, primary-confirmed). A consent to drill (Waikato Regional Council bore permit) costs $546.25 and allows drilling plus taking up to 15 m³/day. Taking more than 15 m³/day from one bore requires a separate Resource Consent to take water, which normally requires a (longer) pump test. Confirms the CR_045/CR_032 Waikato 15 m³/day threshold with the exact 2025/26 bore-permit fee."
source_location: "p.1 'Basic Process' paragraph"
- claim: "PUMP / RETICULATION / FILTRATION — Council-AI indicative, EXCL drilling (weaker than the drilling quote). MPDC AI-generated summary (14 Nov 2025) of typical NZ private-bore setup costs, low / mid / high: submersible pump + installation $1,250 / $2,500 / $4,000; reticulation (pipework) $1,000 / $2,000 / $3,000; filtration and treatment $800 / $2,500 / $5,000. Council explicitly labels this table AI-generated from industry sources (NZ pump/plumbing cost guides, bore suppliers/installers, filtration providers), indicative and varying by property layout and water quality — it is NOT a commercial quote."
source_location: "p.2 'Estimated Costs for Private Bore Setup (excluding Drilling)', 14 Nov 2025 — Council AI-generated table"Neobiome Intelligence relevance
Resolves RT_295 — the verified primary for params.py borehole_drill_capex. A real Waikato community-bore quote (21,440 excl GST for a 64 m 100 mm bore) confirms CR_045's flag that the model's interim **12,000** drill-capex is **low**: a genuine community-oriented bore is ~21k at 100 mm and ~26–28k at 150 mm (community casing, +20–30%). The model can either lift the flat cell toward ~18–22k or, better, adopt the quote’s structure — a fixed 8,900** mobilisation + first-20 m plus **285/m thereafter — which scales cleanly with the site water-table depth the sampler already returns (water_table_m → F21). Now backed by a verified commercial quote rather than a synthesis.
Also: the Waikato take-consent trigger (>15 m³/day) and the $546.25 bore-permit fee confirm the engine’s consent-gate framing at source. The pump/reticulation/filtration figures are Council-AI indicative — they corroborate but do not firm borehole_pump_capex (4,500); a real installed-pump quote is still wanted (RT_260 residual). Scope caveat: these rates are Waikato alluvial — high confidence there, indicative nationally; a second-region real quote would broaden it (RT_260 residual). See borehole.
Source provenance note
Two parts, different authority. The Standard Drilling Rates + 64 m worked example are a genuine Brown Bros (NZ) Ltd commercial quote (email Kelly Brown → Andrea Durie, 12 Nov 2025, ref 25/26/172) — authoritative, text-verified verbatim via pdftotext. The pump/reticulation/filtration table (p.2) is a Council-AI-generated summary (14 Nov 2025), explicitly indicative. The raw was downloaded directly from mpdc.govt.nz as an authoritative council PDF (not AI-retrieved), so no retrieval-provenance frontmatter applies; page data_quality: high is weighted to the verified drilling quote, with the AI pump table flagged inline.
Research targets
Research gaps
- A real installed submersible-pump + reticulation + filtration quote for a NZ community bore (the MPDC p.2 table is Council-AI indicative, not a quote), and a second-region real driller quote to broaden beyond Waikato alluvial — both fold into the RT_260 residual (no new RT raised).
Connections
Links to
Technologies (1): Groundwater (community-scale water …
Referenced by
Sources (3): CR_046 · CR_053 · REG_025
EDT domains (1): D03: Water, Waste & Circular Systems
Concepts (1): Regulatory Consenting for Off-Grid Communities…
Technologies (1): Groundwater (community-scale water …