APAC-Central, Inc. D/B/A Preston Quarry — NPDES permit AR0045063: limits, due date and EPA's record

NPDES permit AR0045063 · Minor NON-POTW · administratively continued, expires 2026-03-31 · EPA's file as of 2026-09-19

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.

This permit expired on 2026-03-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among AR permits in EPA's filings — check your permit).

Limits in force (18)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen demand, chem. [low level] [COD]	MO AVG	<= 50 mg/L	all year
001	Oxygen demand, chem. [low level] [COD]	DAILY MX	<= 75 mg/L	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
001	Oil & Grease	MO AVG	<= 10 mg/L	all year
001	Oil & Grease	DAILY MX	<= 15 mg/L	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Oxygen demand, chem. [low level] [COD]	MO AVG	<= 50 mg/L	all year
002	Oxygen demand, chem. [low level] [COD]	DAILY MX	<= 75 mg/L	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
002	Oil & Grease	MO AVG	<= 10 mg/L	all year
002	Oil & Grease	DAILY MX	<= 15 mg/L	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year