CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY — NPDES permit IL0002305: limits, due date and EPA's record

NPDES permit IL0002305 · Minor NON-POTW · effective, expires 2029-09-30 · EPA's file as of 2026-09-19

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

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 (60)

Outfall	Parameter	Statistic	Limit	Months
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.2 mg/L	Mar, Apr, May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= .9 mg/L	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 1.2 mg/L	Sep, Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.8 mg/L	Jan, Feb, Nov, Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Mar, Apr, May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 3 mg/L	Jun, Jul, Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.7 mg/L	Sep, Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 4 mg/L	Jan, Feb, Nov, Dec
002	Nitrogen, ammonia total [as N]	WKLY AVG	<= 2.3 mg/L	Jun, Jul, Aug
002	Iron, total [as Fe]	30DA AVG	<= 2 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	all year
002	Oil and grease	30DA AVG	<= 15 mg/L	all year
002	Oil and grease	DAILY MX	<= 30 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
002	Mercury, total [as Hg]	30DA AVG	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
003	pH	MO MIN	>= 6 SU	all year
003	pH	MO MAX	<= 9 SU	all year
003	Solids, total suspended	30DA AVG	<= 25 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.9 mg/L	Mar, Apr, May
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 2.4 mg/L	Jun, Jul, Aug
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 3.9 mg/L	Sep, Oct
003	Nitrogen, ammonia total [as N]	30DA AVG	<= 6.3 mg/L	Jan, Feb, Nov, Dec
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Mar, Apr, May
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Jun, Jul, Aug
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Sep, Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Jan, Feb, Nov, Dec
003	Nitrogen, ammonia total [as N]	WKLY AVG	<= 9.8 mg/L	Mar, Apr, May
003	Nitrogen, ammonia total [as N]	WKLY AVG	<= 6.1 mg/L	Jun, Jul, Aug
003	Nitrogen, ammonia total [as N]	WKLY AVG	<= 9.8 mg/L	Sep, Oct
003	Iron, total [as Fe]	30DA AVG	<= 2 mg/L	all year
003	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	all year
003	Oil and grease	30DA AVG	<= 15 mg/L	all year
003	Oil and grease	DAILY MX	<= 30 mg/L	all year
003	Acenaphthylene	DAILY MX	report only	all year
003	Acenaphthene	DAILY MX	report only	all year
003	Anthracene	DAILY MX	report only	all year
003	Benzo[k]fluoranthene	DAILY MX	report only	all year
003	Benzo[a]pyrene	DAILY MX	report only	all year
003	Chrysene	DAILY MX	report only	all year
003	Fluoranthene	DAILY MX	report only	all year
003	Fluorene	DAILY MX	report only	all year
003	Indeno[1,2,3-cd]pyrene	DAILY MX	report only	all year
003	Phenanthrene	DAILY MX	report only	all year
003	Pyrene	DAILY MX	report only	all year
003	Benzo[ghi]perylene	DAILY MX	report only	all year
003	Benzo[a]anthracene	DAILY MX	report only	all year
003	Dibenz[a,h]anthracene	DAILY MX	report only	all year
003	Naphthalene	DAILY MX	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Mercury, total [as Hg]	30DA AVG	report only	all year
003	Mercury, total [as Hg]	DAILY MX	report only	all year
003	3,4-Benzofluoranthene	DAILY MX	report only	all year
003	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 20 mg/L	all year
003	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 40 mg/L	all year