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Green Diamond Performance Materials, Inc.

Ferroalloy Ores, Except Vanadium, Riddle, Oregon. NPDES permit OR0001627 expired Sep 30, 2016; its limits still apply. Last 12 months: no values over a limit, 2 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form OP monthly (3 values), form Q quarterly (4 values)
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 (10)

Parameter	Statistic	Limit	Months
pH	daily minimum	report only (SU)	Jul–Oct
pH	daily minimum	≥ 6.5 SU	Jan, Feb, Mar, Apr, May, Jun, Nov, Dec
pH	daily maximum	report only (SU)	Jul–Oct
pH	daily maximum	≤ 8.5 SU	Jan, Feb, Mar, Apr, May, Jun, Nov, Dec
Solids, total suspended	value	report only (mg/L)	all year
Oil & Grease	value	report only (mg/L)	all year
Hardness, total [as CaCO3]	value	report only (mg/L)	all year
Silver, total [as Ag]	value	report only (ug/L)	all year
Oil and grease visual	value	report only (N=0;Y=1)	Jul–Oct
Oil and grease visual	value	≤ 0 N=0;Y=1	Jan, Feb, Mar, Apr, May, Jun, Nov, Dec

How strict are these limits?

pH, daily minimum at least 6.5 SU — stricter than 62% of 95 other minor industrial and other permits in Oregon; 37% have the same limit
pH, daily maximum 8.5 SU — stricter than 62% of 94 other minor industrial and other permits in Oregon; 37% have the same limit

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OR0001627 · MCP: https://passage-data.com/mcp