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Smyrna Ready Mix Concrete, LLC

Ready-Mixed Concrete, Conway, Arkansas. NPDES permit AR0052396 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 6 times (last May 2026), 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 25 days after each period: form A monthly (15 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 120 required values missing, 9 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
April 2026	Oxygen demand, chem. [low level] [COD], monthly average	52 mg/L	≤ 50 mg/L	4%
April 2026	Solids, total suspended, daily maximum	118 mg/L	≤ 53 mg/L	123%
April 2026	Solids, total suspended, monthly average	118 mg/L	≤ 35 mg/L	237%
May 2026	Oxygen demand, chem. [low level] [COD], monthly average	52 mg/L	≤ 50 mg/L	4%
May 2026	Solids, total suspended, daily maximum	118 mg/L	≤ 53 mg/L	123%
May 2026	Solids, total suspended, monthly average	118 mg/L	≤ 35 mg/L	237%

Limits in force (15)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	instantaneous minimum	≥ 2 mg/L	all year
Oxygen demand, chem. [low level] [COD]	monthly average	≤ 50 mg/L	all year
Oxygen demand, chem. [low level] [COD]	daily maximum	≤ 75 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 35 mg/L	all year
Solids, total suspended	daily maximum	≤ 53 mg/L	all year
Oil & Grease	monthly average	≤ 10 mg/L	all year
Oil & Grease	daily maximum	≤ 15 mg/L	all year
Copper, total recoverable	monthly average	report only (ug/L)	all year
Copper, total recoverable	daily maximum	report only (ug/L)	all year
Copper, total recoverable	monthly average	report only (lb/d)	all year
Copper, total recoverable	daily maximum	report only (lb/d)	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

How strict are these limits?

Oxygen demand, chem. [low level] [COD], daily maximum 75 mg/L — stricter than 13% of 84 other minor industrial and other permits in Arkansas; 86% have the same limit
Oxygen demand, chem. [low level] [COD], monthly average 50 mg/L — stricter than 11% of 78 other minor industrial and other permits in Arkansas; 88% have the same limit

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

Same industry: the 7 Stone, Clay, Glass and Concrete Products permits in Arkansas.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/AR0052396 · MCP: https://passage-data.com/mcp