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Martin Marietta Materials, Inc - Fort Calhoun West Quarry

Crushed And Broken Limestone, Fort Calhoun, Nebraska. NPDES permit NE0138185 expired Jun 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form M quarterly (2 values), form Q quarterly (6 values), form P every 60 months
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (9)

Parameter	Statistic	Limit	Months
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 25 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Hydrocarbons, total gas chromatograph	monthly average	report only (mg/L)	all year
Hydrocarbons, total gas chromatograph	daily maximum	report only (mg/L)	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Priority pollutants scan [yes/no]	value	report only (N=0;Y=1)	all year

How strict are these limits?

Solids, total suspended, monthly average 25 mg/L — stricter than 83% of 43 other minor industrial and other permits in Nebraska; 14% have the same limit
Solids, total suspended, daily maximum 45 mg/L — stricter than 50% of 28 other minor industrial and other permits in Nebraska; 39% have the same limit

Cited limits by parameter: Nebraska's rules and the federal ones.

Same industry: the 11 Mining and Quarrying of Nonmetallic Minerals permits in Nebraska.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NE0138185 · MCP: https://passage-data.com/mcp