# N05_E18 Great Lakes pilot: 1989–1991 Grand Calumet source ledger and modern regulatory bridge **Run date:** 2026-08-12 **Sector:** `N05_E18` — canonical 24 × 24 grid cell, 37.5–45.0° N and 75–90° W **Time bands:** 1950–2000 historical bridge; 2000–present modern baseline **Research status:** bounded finding; no sector score or `provisional_quadrant` assigned ## Selection and non-duplication decision This run continues the Great Lakes pilot at `N05_E18` and advances the next unresolved 1950–2000 path: retrieve page-level historical source records that can distinguish point sources, nonpoint sources, contaminated sediment, and regulatory/remediation knowledge in the Grand Calumet River / Indiana Harbor Canal system. The selected items were not present in the existing project notes: - **Brannon et al., *Analyses of Impacts of Bottom Sediments from Grand Calumet River and Indiana Harbor Canal on Water Quality***, U.S. Army Waterways Experiment Station, February 1989, Internet Archive item `DTIC_ADA206507`. - **U.S. Army Corps of Engineers, *Information Summary, Area of Concern: Grand Calumet River, Indiana***, March 1991, Internet Archive item `DTIC_ADA236435`. The reports overlap thematically with the existing 1966–2026 environmental-regulation note, but they add distinct primary/technical report items, page-level observations, and a more explicit source-ledger distinction. Existing claims were not copied as new findings unless the page provenance below was newly verified. ## Spatial crosswalk Both reports concern the Grand Calumet River / Indiana Harbor Canal system in Lake County, Indiana, with nearshore Lake Michigan and connected municipal/industrial facilities. This is a subarea of the mixed land/water `N05_E18` cell, not a cell-wide sample. | Source footprint | Relationship to fixed cell | Confidence | Limitation | |---|---|---|---| | Grand Calumet River, Indiana Harbor Canal, Indiana Harbor, and nearshore Lake Michigan | Within or adjacent to the Merrillville/Gary human anchor and the northern part of `N05_E18` | high | Report maps and facility footprints were not georeferenced to the full 24 × 24 envelope in this run | | Gary, Hammond, and East Chicago municipal systems | Local corridor/subarea within the cell | high | Municipal boundaries, sewer catchments, and report study area are not equivalent to the fixed sector | | 68-square-mile Grand Calumet drainage area used in the 1989 report | A small historical drainage-study footprint, not the cell | high | Report's drainage-area denominator is not a fixed-cell water or land denominator | ## Raw observations ### A. 1989 technical report: contamination sources and water-quality history **Source:** Brannon, James M., et al., *Analyses of Impacts of Bottom Sediments from Grand Calumet River and Indiana Harbor Canal on Water Quality*, Miscellaneous Paper D-89-1, U.S. Army Engineer Waterways Experiment Station, February 1989. Internet Archive identifier `DTIC_ADA206507`. | Observation | Direct source wording/result | Page provenance | Observation type | Confidence / limitation | |---|---|---|---|---| | Permitted outfalls | The report states that there were **39 permitted outfalls** on the Grand Calumet River and Indiana Harbor Canal, while measured point-source outfall mass discharges did not always account for total contaminant levels | PDF p. 12, section “Contamination Sources,” para. 7 | Reported technical observation | High for the report statement; medium for reuse because it is a 1984-era source inventory summarized in a 1989 report and lacks a fixed-cell coordinate table | | Industrial and nonpoint sources | The report identifies industrial/urban runoff, combined sewer overflows, waste-fill or pond leachate/overflow, and industrial spills as nonpoint or additional sources; it also describes **15 different CSO points** where untreated sewage and industrial wastewater could bypass treatment during rainfall exceeding **0.1 in. in 24 hours** | PDF p. 12, para. 7 | Reported technical observation | High for the cited passage; source lineage is partly secondary because the report cites HydroQual, LMF, and EPA materials | | Waste sites | The report states that **11 dumps and landfills** and **26 surface impoundments** near the river might contain hazardous materials | PDF p. 12, para. 7 | Reported technical observation | High for the report statement; “might contain” is retained and is not converted into confirmed contamination or a count score | | Reported improvement | The report summarizes earlier studies as reporting a general reduction between **1977 and 1983** in fecal coliform bacteria, ammonium-nitrogen, cyanides, phenols, total phosphorus, and oil and grease; it also reports improvement in ammonium-nitrogen, cyanide, and suspended solids in the Indiana Harbor Canal from **1970 to 1981**, with other constituents showing minor or no improvement | PDF p. 12, para. 8 | Technical literature synthesis | Medium: the report is a secondary synthesis of prior studies; original series were not retrieved in this run | | CSO and runoff load basis | The report uses an EPA 1985 estimate of **11 billion gallons/year** for CSO discharge, **35 in./year** average rainfall over a **68-square-mile** drainage area, runoff coefficient **0.8**, and **1,250 mgd** selected base stream flow for a planning-level mass-load comparison | PDF p. 26, para. 43; PDF p. 106, Table 6 notes | Reported assumptions used in a technical calculation | High for transcription; not a measured cell-wide flow series and not recomputed here | | Load comparison | Table 6 reports GCR/IHC in-stream TSS of **14 mg/L** and a corresponding average stream mass load of **50 × 10^6 lb/year**; it reports point-source total-solids loading summarized from HydroQual as **56 × 10^6 lb/year**. The table also reports CSO median concentrations of 190 mg/L TSS and 54 mg/L BOD5, while explicitly labeling the values as comparison inputs and estimates | PDF p. 106, Table 6 and notes | Reported table values | High for the table; medium for comparability because source periods, footprints, and calculation bases differ | | Seasonal uncertainty | Historical GCR/IHC data indicate dissolved oxygen reached its lowest values in summer, while 1983 monitoring also found low dissolved oxygen in November and February; suspended solids and storm-runoff pollutants often rose in winter and spring; stream-flow data were not included in the water-quality monitoring discussed | PDF p. 67, para. 153 | Reported technical limitation | High for the report statement; it demonstrates missing flow covariates rather than a complete seasonal series | | Daily variability | HydroQual is summarized as finding GCR/IHC dissolved oxygen variation of less than **1–2 mg/L** over 24 hours and using flow-weighted 24-hour composite samples to calibrate a steady-state model | PDF p. 67, para. 155 | Reported technical observation and method | High for the cited summary; not independently checked against the HydroQual original | | Modeling limitation | The report concludes that more detailed hydrodynamic and suspended-sediment transport data were needed before sophisticated methods could quantify sediment sources and resuspension/transport | Internet Archive item metadata abstract; report discussion around PDF pp. 58–63 | Technical interpretation by the report authors | High as an authored conclusion; it is not a claim that no later data exist | ### B. 1991 AOC information summary: sediment, water, and institutional record **Source:** U.S. Army Corps of Engineers, Environmental Laboratory, *Information Summary, Area of Concern: Grand Calumet River, Indiana*, Miscellaneous Paper EL-91-10, March 1991, prepared for EPA Great Lakes National Program Office ARCS. Internet Archive identifier `DTIC_ADA236435`. | Observation | Direct source wording/result | Page provenance | Observation type | Confidence / limitation | |---|---|---|---|---| | AOC scope | The report places the AOC in Lake County, Indiana and states that it includes most of the Grand Calumet River, the Indiana Harbor and Canal, and nearshore Lake Michigan | PDF p. 15, “General location” section | Reported geographic scope | High for the report-defined AOC; AOC extent is not the fixed sector boundary | | Contaminated sediment volume | The report estimates **1.4 million cubic yards** in the east branch, **700,000 cubic yards** in the west branch and Indiana Harbor Canal upstream of the navigation project, **1,000,000 cubic yards** in the authorized navigation project, and **500,000–1,000,000 cubic yards** of soft sediment adjacent to the authorized channel; it summarizes approximately **3.5–4 million cubic yards** of contaminated sediment within the AOC | PDF p. 15, “Volume of contaminated sediments” section | Reported estimate | High for transcription; medium for geographic and temporal reuse because the estimate is an AOC/project footprint, not a fixed-cell mass and not a current inventory | | Sampling history | The report states that at least **10 major sediment sampling studies** had been conducted by EPA Region V, Indiana DEM, and the U.S. Army Corps of Engineers | PDF p. 15, “Sediment data” section | Reported institutional observation | High; the cited count is a report-level summary and the individual study footprints were not reconstructed here | | Point-source contribution to flow | The report states that the Grand Calumet was predominantly fed by municipal and industrial wastewater, **up to 90 percent of the flow**, and that NPDES permits and extensive outflow monitoring had produced a substantial data body | PDF p. 15, “Point source discharges” section | Reported technical observation | High for the report statement; medium for reuse because the denominator, dates, and flow conditions are not fully harmonized in this run | | Water-quality monitoring | The report states that IDEM, the Corps, MSD, and EPA collected water-quality data from the GCR/IHC and nearshore Lake Michigan, and that IDEM maintained a fixed-station surveillance program alongside industrial and municipal wastewater-discharge monitoring | PDF p. 15, “Water quality data” section | Reported institutional observation | High; station-level series were not extracted here | | Contaminated groundwater | The report states that Indiana DEM data indicated groundwater contamination in the AOC | PDF p. 15, “Nonpoint source discharges” section and report Figure 25 | Reported technical observation | Medium-high for the statement; no map georeferencing or constituent series was extracted in this run | | Source register | The 1991 report's references include Snow's 1974 EPA Calumet-area investigation, a 1984 HydroQual wasteload allocation study, Indiana's 1986 fixed-station monitoring strategy, a 1987 USGS water-resources report, and other technical records | PDF pp. 26–27, references R18–R42 | Provenance/navigation observation | High; these are leads for the next retrieval path, not evidence substituted for the original documents | ### C. Contemporary structured regulatory crosswalk The current EPA Great Lakes Basin–Indiana CSO table identifies Gary's NPDES permit `IN0022977` and lists the Grand Calumet River and Little Calumet River as receiving waters. It identifies Hammond's permit `IN0023060` and the Grand Calumet River/East Arm Little Calumet River, and East Chicago's permit `IN0022829` and the Indiana Harbor Canal/Grand Calumet River. This is a current institutional crosswalk, not a reconstructed 1989–1991 time series. EPA's ECHO documentation states that ICIS-NPDES permit-limit and Discharge Monitoring Report data are available as national fiscal-year files, with records organized by outfall, monitoring location, limit set, and monitoring period; reported cells may contain measurements or No Data Indicator codes. The documentation establishes a reproducible modern data path, but this run did not download and spatially allocate the DMR files to the fixed cell. EPA's current Grand Calumet AOC page describes the area as heavily industrialized, identifies legacy pollutants in river and canal sediments, and states that routine monitoring indicates high biochemical oxygen demand. It also states that pre-1972 industrial discharges and nearby untreated municipal sewage contributed to the historical condition. These are current agency statements about the AOC, not proof of conditions throughout `N05_E18`. ## Source interpretation The new historical reports support a narrower, evidence-aware bridge for the named corridor: ```text industrial and municipal wastewater + runoff/CSO pathways → source inventories and monitoring expand → reported improvement in selected constituents, with persistent or mixed results → contaminated sediment and groundwater remain institutional problems → modern NPDES/DMR and AOC-remediation systems provide structured continuation, but project footprints remain bounded ``` The important finding is not a single pollution score. It is that the late-industrial water system was represented as a coupled source-and-sink problem: point discharges, municipal treatment, stormwater/CSO pathways, sediment storage/resuspension, groundwater, and nearshore Lake Michigan were analyzed together, while the authors explicitly documented missing flow and transport data. This supports a historical institutional-capacity observation—measurement and regulatory apparatus existed and expanded—but does not by itself demonstrate effective adaptation, causal remediation, or cell-wide recovery. The modern EPA records make the bridge operationally reproducible: permit identifiers and receiving waters are available in a current authoritative table, and EPA documents a machine-readable ICIS-NPDES DMR path. The current data path should be used to extract facility/outfall observations in a later run, preserving fiscal year, monitoring location, pollutant, units, result type, and NODI codes. It must not be backcast onto the 1989 estimates without a source and method crosswalk. ## Derived observations and scores No Macro-Culture constraint, adaptive-capacity, energy, water, infrastructure, or population score was calculated. The historical reports contain planning assumptions and heterogeneous project estimates, but they do not provide a provenance-complete, fixed-cell, period-comparable raw table. The following are **not scores**: - `39` permitted outfalls, `15` CSO points, `11` dumps/landfills, and `26` surface impoundments are source-reported historical counts for the named GCR/IHC study area; they are not normalized sector indicators. - `3.5–4 million cubic yards` is an AOC contaminated-sediment estimate from 1991; it is not a current or cell-wide contamination inventory. - `11 billion gallons/year` CSO discharge, `1,250 mgd` base flow, and the Table 6 loads are report assumptions/calculations for a historical planning comparison; they are not modern observations. **Formula version:** none applied. **Derived constraints:** not calculated. **Adaptive-capacity indicators:** not calculated. ## Model classification ```yaml sector_id: N05_E18 periods_touched: [1950-2000, 2000-present] provisional_quadrant: unresolved reason: historical reports are subarea-specific and methodologically heterogeneous; current regulatory data were identified but not extracted and allocated to the fixed cell; no formula-ready comparable raw table exists ``` `provisional_quadrant` is a model output, not an archival fact. This run assigns none. ## Confidence and missingness - **Historical report authority:** high for the report-authored observations, page references, units, and stated assumptions; medium for independent confirmation because several values summarize earlier studies not retrieved here. - **Geographic fit:** high for the GCR/IHC/AOC corridor; medium for the relationship to the full mixed land/water `N05_E18` cell. - **Temporal fit:** high for the 1989 and 1991 report dates; medium for underlying studies whose dates vary from the 1970s through 1980s. - **Measurement quality:** mixed. Some entries are reported counts, units, or table values; others are planning assumptions, estimates, or literature summaries. - **Modern crosswalk confidence:** high for EPA permit identifiers, receiving-water labels, and the documented ICIS-NPDES data path; no modern DMR values were extracted in this run. Explicit missingness: - `project_footprint_not_cellwide`: all historical GCR/IHC/AOC and modern CSO observations are subarea or facility records. - `source_lineage_partial`: 1989 report values often cite HydroQual, EPA, LMF, IDEM, or USGS material not independently retrieved here. - `historical_series_not_reconstructed`: no continuous 1970–2000 pollutant, flow, permit, or enforcement series was built. - `modern_dmr_not_extracted`: EPA's machine-readable ICIS-NPDES path was verified from documentation, but the fiscal-year files were not downloaded or allocated to the cell. - `geographic_match_uncertain`: report maps, outfalls, CSOs, and sediment polygons were not georeferenced against the canonical envelope. - `unit_and_method_heterogeneity`: counts, concentrations, flows, loads, cubic yards, and narrative classifications cannot be combined without explicit variable and method crosswalks. - `post-1991_continuity_unresolved`: current EPA pages establish ongoing regulatory/remediation context but do not supply a continuous bridge from the 1989–1991 estimates. - `not_applicable`: no score and no quadrant. Archival silence, unlocated source reports, missing DMR rows, and inaccessible historical series are not converted into zero or absence. ## Falsification and alternative explanations The observations do not establish that geography mechanically produced the industrial outcome. Corporate site selection, lake shipping, rail investment, municipal sewer design, regulatory timing, industrial organization, labor migration, state/federal policy, and legacy infrastructure could explain the observed concentration and its remediation trajectory independently or jointly with hydrology. The historical reports also caution against a simple “pollution declined, therefore adaptation increased” inference: selected constituents reportedly improved while other constituents showed minor or no improvement; sediment and groundwater remained concerns; and the authors identified missing flow and sediment-transport data. Any later quadrant assignment should test whether institutional measurement capacity predicts outcomes better than the physical sector variables alone. ## Next search path 1. Download EPA ICIS-NPDES DMR/permit files for the relevant fiscal years and facility identifiers; preserve outfall, monitoring location, pollutant, units, result, limit, NODI code, and date fields before any aggregation. 2. Retrieve the cited primary or near-primary reports: HydroQual 1984 wasteload allocation study, EPA 1985 Grand Calumet/IHC master plan, Snow 1974 Calumet-area investigation, Indiana 1986 fixed-station strategy, and the 1987 USGS water-resources report. 3. Retrieve and georeference the 1989/1991 report maps and tables for outfalls, CSOs, sediment sampling, drainage area, and monitoring stations; keep the report footprint separate from the fixed cell. 4. Build a non-overlapping 1970–2000 source ledger distinguishing point-source permits, municipal treatment, CSO/runoff, sediment, groundwater, and nearshore Lake Michigan observations. 5. Compare the historical ledger with current EPA/USGS/WQP records only where variable, unit, footprint, and method are documented as directly comparable or related-but-not-equivalent. 6. Continue the nine-sector Great Lakes pilot before assigning any formula output or `provisional_quadrant`. ## Provenance register 1. **Brannon, James M., et al.** *Analyses of Impacts of Bottom Sediments from Grand Calumet River and Indiana Harbor Canal on Water Quality*. U.S. Army Engineer Waterways Experiment Station, Miscellaneous Paper D-89-1, February 1989. Internet Archive item `DTIC_ADA206507`; PDF pages 12, 26, 67, and 106 used above; item metadata and abstract accessed 2026-08-12. 2. **U.S. Army Corps of Engineers, Environmental Laboratory.** *Information Summary, Area of Concern: Grand Calumet River, Indiana*. Miscellaneous Paper EL-91-10, March 1991; prepared for EPA Great Lakes National Program Office ARCS. Internet Archive item `DTIC_ADA236435`; PDF pp. 15 and 26–27 used above; item metadata and abstract accessed 2026-08-12. 3. **Historical report PDF derivative, 1989.** Exact downloadable item derivative used for page verification: `DTIC_ADA206507.pdf`. 4. **Historical report PDF derivative, 1991.** Exact downloadable item derivative used for page verification: `DTIC_ADA236435.pdf`. 5. **U.S. EPA.** *Combined Sewer Overflows in the Great Lakes Basin—Indiana*. Current table retrieved 2026-08-12; Gary `IN0022977`, Hammond `IN0023060`, and East Chicago `IN0022829` rows used for the contemporary permit/receiving-water crosswalk. 6. **U.S. EPA ECHO.** *ICIS-NPDES Permit Limit and Discharge Monitoring Report (DMR) Datasets*. Documentation retrieved 2026-08-12; used to identify the modern fiscal-year, outfall/monitoring-location data path and NODI handling. 7. **U.S. EPA.** *Grand Calumet River AOC*. Current agency context retrieved 2026-08-12; used only for the bounded modern AOC/legacy-pollution crosswalk. 8. **Project sector record.** Canonical bounds and Merrillville anchor: `ghojualamanchu/sectors/N05_E18_MERRILLVILLE.json`. 9. **Project SOP.** Fixed 24 × 24 geometry, source hierarchy, provenance, missingness, and model-classification boundary: `08-research-sop.md`. ## Bottom line The 1989 and 1991 reports provide a newly verified, page-level historical bridge for `N05_E18`: the Grand Calumet/Indiana Harbor system was documented as a coupled industrial-water system with permitted and nonpoint sources, municipal treatment, CSOs, contaminated sediment, groundwater concerns, and incomplete flow/transport knowledge. The reports also document mixed constituent trends rather than a simple improvement curve. Current EPA records provide a machine-readable permit/DMR continuation and identify the relevant Gary, Hammond, and East Chicago receiving-water pathways. This is a defensible historical and institutional observation for a subarea of `N05_E18`, not a cell-wide score. The formula and `provisional_quadrant` remain **unresolved**.