Case B: Barfs Road, Distington
England · Evidence date 2026-08-21 · AI draft for senior consultant review
Research prototype — draft technical interpretation for professional review.
Case reconstructed from publicly available planning documents. Independent research prototype; not affiliated with or endorsed by the original report authors. Historical/source-selected criteria require applicability review. This draft provides no regulatory approval, professional sign-off or certified design. Gas, radon, controlled-waters and other specialist decisions may need further expert assessment.
Case evidence and context
Draft contamination interpretation and next actions; flag ground-condition interfaces, no foundation design.
Scope/development B-F01
Approximately 2.57 ha managed grass/public open space at Barfs Road, Distington, proposed 61 residential dwellings with private gardens and soft landscaping.
B01 · source PDF pages 6, 7 · reported_fact
History B-F02
Housing established by mid-1940s; demolished early 2000s. Potential demolition/fill sources include ash, coal, brick, concrete and former services. Adjacent southwest garage on 1961-1988 mapping; smithy about 9 m southeast on 1898 mapping.
B01 · source PDF pages 7, 11, 12, 13 · reported_fact
Off-site sources B-F03
Barfs Quarry about 104 m northwest; historical landfill about 139 m west; railway cuttings nearby. Records include inert, household, commercial and industrial waste. These are potential sources, not demonstrated contaminant migration onto this site.
B01 · source PDF pages 9, 11, 12, 13, 14 · reported_fact
Geology B-F04
Mapped glacial till over First Limestone with Hensingham Grit in southeastern tip. Bedrock not reached during this investigation. Logs contain clay, sand lenses and variable fill.
B01 · source PDF pages 8 · reported_fact
Hydrogeology and conflicting records B-F05
B01 geology section reports bedrock Secondary A and till Secondary Undifferentiated; its CSM and B02 describe bedrock as Principal. Both statements are retained unresolved. Distington Beck about 111 m east, partly culverted; no abstraction within 1 km, potable abstraction within 2 km, or SPZ on/within 500 m reported.
B01 · source PDF pages 8, 10, 14, 17 · reported_fact
Radon context B-F06
Mapped radon potential 10%-30% of homes above action level across most of site.
B01 · source PDF pages 9 · reported_fact
Coordinate records B-F07
Phase 1 gives site NGR 422563,601960. Phase 2 borehole coordinates cluster around 300600E,523800N. These records conflict; do not silently geolocate using the Phase 1 number.
B01 · source PDF pages 6 · reported_conflict_with_B02_logs
Investigation B-F08
15 windowless-sample boreholes; logs dated 13-15 May 2026. Five gas/water wells: WS02/04/08/12/14. Eighteen soil lab IDs, including paired depths at several locations; eight hydrocarbon/BTEX suites and six soil leachates. Lab sample dates all 15 May 2026; preserve difference from some drilling dates.
B02 · source PDF pages 7, 13, 14, 33, 78, 122, 123 · reported_fact
Ground observations B-F09
Typical made ground about 0.30-1.40 m, often with topsoil, demolition debris and local relic topsoil. WS02 instead records made ground to 3.70 m and a void 3.70-4.90 m, with no natural ground proved. Origin unconfirmed. No fuel/oil staining, odour, free product or visible asbestos recorded.
B02 · source PDF pages 8, 36 · reported_fact
Water B-F10
Water strikes WS06 at 3.00 m (standing 2.13 m), WS11 at 3.64 m. Water in lenses may be discontinuous; five visits include dry, wet and obstructed wells. Raw monitoring table records levels and purging notes. No groundwater chemistry certificate supplied; soil leachate is a distinct test matrix.
B02 · source PDF pages 9, 98, 99, 100, 101, 102 · reported_fact
Monitoring design/status B-F11
Original desk-study monitoring design specified at least six visits over at least three months. Supplied record has five visits, 12 June-27 July 2026. Some wells could not be located or measured. Instrument: GFM436 gas analyser with flow pod; field notes specify minimum three minutes, five for initially high readings.
B01 · source PDF pages 17 · prior_investigation_design_with_B02_observations
Screening configuration B-F12
Human-health configuration is residential with homegrown produce. Source selects 6% SOM for organic criteria, informed by average total organic carbon; TOC and SOM remain different measured/assumed fields. S4UL, C4SL and ATRISK values are source-selected. Controlled-waters criteria are copied only as benchmark configuration; statutory applicability and compliance point have not been independently validated.
B02 · source PDF pages 16, 17, 18, 19, 20 · source_selected_assessment_configuration
Laboratory QA B-F13
Chemtech 26-06051; eighteen samples marked non-deviating in certificate. Per-result units, method codes, LoDs, accreditation and n/t retained. No independent field QA chain supplied in the normalized pack.
B02 · source PDF pages 122, 140, 141, 142 · reported_fact
Ground features B-F14
Local soft/wet till, sand lenses, and a peat parting around 1.13 m in WS08. Coal mining search records no workings beneath site; local limestone dissolution features exist, including reported swallow hole about 140 m southeast.
B01 · source PDF pages 8, 9 · reported_fact
Deterministic benchmark comparisons
Historical source-selected criteria; applicability requires review. An exceedance is a screening flag, not confirmed unacceptable risk. Counts are comparisons, not independent samples.
- 772
- 5
- 42
WS02 · Lead · exceeds
234 mg/kg at 0.00 - 0.40 m; benchmark 200 mg/kg (B-CR-06).
B-LAB-124-T1-R14-C2 · source page 124 · soil
WS11 · Copper · exceeds
2590 mg/kg at 0.10 - 0.40 m; benchmark 2400 mg/kg (B-CR-05).
B-LAB-130-T1-R13-C4 · source page 130 · soil
WS12 · Benzo(b)fluoranthene · exceeds
6.59 mg/kg at 0.10 - 0.37 m; benchmark 3.7 mg/kg (B-CR-17).
B-LAB-131-T1-R7-C5 · source page 131 · soil
WS12 · Benzo(a)pyrene · exceeds
4.39 mg/kg at 0.10 - 0.37 m; benchmark 3 mg/kg (B-CR-16).
B-LAB-131-T1-R9-C5 · source page 131 · soil
WS12 · Dibenzo(a,h)anthracene · exceeds
0.725 mg/kg at 0.10 - 0.37 m; benchmark 0.3 mg/kg (B-CR-21).
B-LAB-131-T1-R11-C5 · source page 131 · soil
Inconclusive reporting limits (42)
These bounds do not demonstrate compliance. They are not measured exceedances.
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{
"evidence_id": "B-LAB-137-T1-R7-C1",
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"location": "WS02",
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"analyte": "Benzo(a)pyrene",
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},
{
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"criterion_id": "B-CR-64",
"location": "WS08",
"depth_raw_m": "0.14 - 0.30",
"analyte": "Benzo(a)pyrene",
"medium": "soil_leachate",
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},
{
"evidence_id": "B-LAB-137-T1-R7-C4",
"criterion_id": "B-CR-64",
"location": "WS09",
"depth_raw_m": "0.15 - 0.24",
"analyte": "Benzo(a)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
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},
{
"evidence_id": "B-LAB-137-T1-R7-C5",
"criterion_id": "B-CR-64",
"location": "WS13",
"depth_raw_m": "0.36 - 1.00",
"analyte": "Benzo(a)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
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"status": "inconclusive_reporting_limit",
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},
{
"evidence_id": "B-LAB-137-T1-R8-C1",
"criterion_id": "B-CR-68",
"location": "WS02",
"depth_raw_m": "0.60 - 1.00",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
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},
{
"evidence_id": "B-LAB-137-T1-R8-C2",
"criterion_id": "B-CR-68",
"location": "WS07",
"depth_raw_m": "0.20 - 0.59",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
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},
{
"evidence_id": "B-LAB-137-T1-R8-C3",
"criterion_id": "B-CR-68",
"location": "WS08",
"depth_raw_m": "0.14 - 0.30",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
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"unit_conversion_factor": 1,
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"status": "inconclusive_reporting_limit",
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},
{
"evidence_id": "B-LAB-137-T1-R8-C4",
"criterion_id": "B-CR-68",
"location": "WS09",
"depth_raw_m": "0.15 - 0.24",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
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},
{
"evidence_id": "B-LAB-137-T1-R8-C5",
"criterion_id": "B-CR-68",
"location": "WS13",
"depth_raw_m": "0.36 - 1.00",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-137-T1-R10-C1",
"criterion_id": "B-CR-66",
"location": "WS02",
"depth_raw_m": "0.60 - 1.00",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-137-T1-R10-C2",
"criterion_id": "B-CR-66",
"location": "WS07",
"depth_raw_m": "0.20 - 0.59",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-137-T1-R10-C3",
"criterion_id": "B-CR-66",
"location": "WS08",
"depth_raw_m": "0.14 - 0.30",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-137-T1-R10-C4",
"criterion_id": "B-CR-66",
"location": "WS09",
"depth_raw_m": "0.15 - 0.24",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-137-T1-R10-C5",
"criterion_id": "B-CR-66",
"location": "WS13",
"depth_raw_m": "0.36 - 1.00",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 137
},
{
"evidence_id": "B-LAB-138-T1-R30-C1",
"criterion_id": "B-CR-62",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Anthracene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 138
},
{
"evidence_id": "B-LAB-138-T1-R32-C1",
"criterion_id": "B-CR-75",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.023,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 138
},
{
"evidence_id": "B-LAB-138-T1-R35-C1",
"criterion_id": "B-CR-65",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Benzo(b)fluoranthene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 138
},
{
"evidence_id": "B-LAB-138-T1-R36-C1",
"criterion_id": "B-CR-67",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Benzo(k)fluoranthene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 138
},
{
"evidence_id": "B-LAB-139-T1-R7-C1",
"criterion_id": "B-CR-64",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Benzo(a)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.005,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 139
},
{
"evidence_id": "B-LAB-139-T1-R8-C1",
"criterion_id": "B-CR-68",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Indeno(1,2,3-cd)pyrene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 139
},
{
"evidence_id": "B-LAB-139-T1-R10-C1",
"criterion_id": "B-CR-66",
"location": "WS14",
"depth_raw_m": "0.28 - 0.80",
"analyte": "Benzo(g,h,i)perylene",
"medium": "soil_leachate",
"result_raw": "< 0.10",
"unit": "µg/l",
"comparison_value_or_bound": 0.1,
"criterion_unit": "µg/l",
"unit_conversion_factor": 1,
"criterion": 0.05,
"status": "inconclusive_reporting_limit",
"source_pdf_page": 139
}
]Coverage, monitoring and limitations
{
"gas": {
"visit_rows": 25,
"concentration_basis": "Steady concentrations from paired initial/steady field records.",
"max_reported_co2_pct": 5.8,
"min_reported_oxygen_pct": 14.2,
"automatic_characteristic_situation": null,
"reason": "Monitoring sufficiency, response zones, temporal pairing, sources and building type need review."
},
"unmatched": {
"soil | Water Soluble Sulphate | mg/kg": 18,
"soil | Moisture Content | %": 18,
"soil | Total Organic Carbon | %": 18,
"soil | Total PAH(16) | mg/kg": 18,
"soil | >C16-C21 Aliphatic (EH_2D_AL) | mg/kg": 8,
"soil | >C21-C35 Aliphatic (EH_2D_AL) | mg/kg": 8,
"soil | pH | pH units": 18,
"soil_leachate | Sulphate | mg/l": 6,
"soil_leachate | Sulphide | mg/l": 6,
"soil_leachate | Hardness ( CaCO3) | mg/l CaCO3": 6,
"soil_leachate | Acenaphthylene | µg/l": 6,
"soil_leachate | Acenaphthene | µg/l": 6,
"soil_leachate | Fluorene | µg/l": 6,
"soil_leachate | Benzo(a)anthracene | µg/l": 6,
"soil_leachate | Chrysene | µg/l": 6,
"soil_leachate | Dibenzo(a,h)anthracene | µg/l": 6,
"soil_leachate | Total PAH(16) | µg/l": 6,
"soil_leachate | pH (10:1 extract) | pH units": 6
},
"limitations": [
"Unmatched analytes are not passes.",
"TPH combined C16-C35 bands require an explicit, approved aggregation rule; this smoke test does not create it.",
"BaP surrogate method applicability is not inferred.",
"Criteria supplied are historical source configuration, not approved current guidance.",
"No risk conclusion follows automatically from exceedance or nondetection."
],
"missing": [
"Current approved final development levels and finished cover distribution",
"Complete field chain of custody, duplicate/blank data and independent instrument calibration records",
"Actual groundwater chemical results",
"Regulator acceptance and any later completed verification"
]
}Guidance used
LCRM1: England planning scope. Develop and update source–pathway–receptor linkages. Use preliminary, generic and detailed assessment proportionately. Generic screening exceedance alone does not establish unacceptable risk. Review scenario, matrix, exposure, chemistry, SOM and sampling coverage before interpreting a comparison.
LCRM2: For relevant linkages consider proportionate options, feasibility, objectives and alternatives. Targeted investigation must name the decision it resolves; do not prescribe blanket excavation from isolated exceedances.
LCRM3: A strategy is not completion evidence. Define performance objectives and applicable criteria, a verification plan with appropriate sampling/inspection and material records, contingencies for unexpected conditions, and a completion report supported by the implemented works. Numerical design requirements need competent selection.
TECH: Gas investigation and protection require specialist assessment against applicable BS8576, BS8485 and CIRIA guidance; radon is a separate BR211 question. Licensed clauses and numerical rules are not implemented. Do not assign final gas class or radon protection from maps alone. Groundwater assessment needs a migration model and compliance point; leachate is not groundwater. Waste classification, WAC, topsoil quality and concrete aggressivity are separate assessments.
AI technical interpretation
Generate a draft from the case evidence, deterministic screening and shared technical guidance for consultant review.