Alpine Silica, LLC - River Ridge Ranch

NPDES permit AR0052965 · Minor NON-POTW · effective, expires 2031-02-28 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
2of 10 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (17)

OutfallParameterStatisticLimitMonths
05IStreamflowMINIMUM >= 52111 cfs all year
05ITurbidityMO AVG report only all year
05ITurbidityDAILY MX report only all year
05ITurbidityMO AVG report only all year
05ITurbidityDAILY MX report only all year
05IpHMINIMUM >= 6 SU all year
05IpHMAXIMUM <= 9 SU all year
05ISolids, total suspendedMO AVG <= 25 mg/L all year
05ISolids, total suspendedDAILY MX <= 45 mg/L all year
05ISolids, total suspendedMO AVG <= 3976.1 lb/d all year
05ISolids, total suspendedDAILY MX <= 7157 lb/d all year
05IOil & GreaseMO AVG <= 10 mg/L all year
05IOil & GreaseDAILY MX <= 15 mg/L all year
05IFlow, in conduit or thru treatment plantMO AVG report only all year
05IFlow, in conduit or thru treatment plantDAILY MX report only all year
05ISolids, total dissolvedMO AVG report only all year
05ISolids, total dissolvedDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states