Oregon

Oregon Department of Environmental Quality
Water Quality Division
811 SW 6th Avenue
Portland, OR 97204

DEQ has reissued OregonŐs GPs for discharges of stormwater from industrial facilities:

1200-Z Permit - effective July 1, 2012 thru June 30, 2017

E.H.2.2 Inspection of Clearing, Grading, and Excavation Activities

E.H.2.2.1 Inspection Frequency. Inspections must be conducted either at least once every 7 calendar days, or at least once every 14 calendar days and within 24 hours of the end of a storm event of 0.5 inches or greater. Inspection frequency may be reduced to at least once every month if the entire site is temporarily stabilized, if runoff is unlikely due to winter (e.g., site is covered with snow or ice) or frozen conditions, or construction is occurring during seasonal dry periods in arid areas and semi-arid areas.

d. Timing - Monitor the discharge during the first 12 hours of the discharge event, which is a measurable storm event resulting in an actual discharge from a site. If it is not practicable to collect the sample within this period, collect the sample as soon as practicable and provide documentation with the Discharge Monitoring Report form why it was not practicable to take samples within the period. Permit registrant is not required to sample outside of regular business hours or during unsafe conditions. Regular business hours are from 8 am to 5 pm on week days, unless the permit registrant specifies different hours in the SWPCP.

e. Monitoring Frequency-Permit registrant must monitor their stormwater discharge according to the frequency described in Table4 below

i. monitoring year is from July 1st to June 30th. The storm water sample must be collected at least 14 days apart.

Magnitude: result in discharge

Interval Between Storms: n/a

1200-ZN Permit

3. Monitoring Timing

a. Permit registrants must conduct monitoring according to the periods below. If it is not practicable to collect the sample within these periods, collect the sample as soon as practicable and document in the DMR why it was not practicable to take samples within the period. Permit registrant is not required to sample outside of regular office hours or during unsafe conditions. Regular business hours are from 8 am to 5 pm on week days, unless the permit registrant specifies different hours in the DMR.

i. Monitor the discharge during the first 12 hours of the storm event.

ii. Collect one sample during the first fall storm event. “First fall storm event” means the first time after September 1 of each year that precipitation occurs and results in a stormwater discharge from the facility.

b. Monitoring for visual observations and numeric effluent limits pursuant to Federal Effluent Limit

Guidelines is exempt from Schedule B.3 of the permit.

Magnitude: result in discharge

Interval Between Storms: n/a

1200-COLS Permit

d. Timing - Monitor the discharge during the first 12 hours of the discharge event, which is a measureable storm event resulting in an actual discharge from a site. If it is not practicable to collect the sample within this period, collect the sample as soon as practicable and provide documentation with the Discharge Monitoring Report form why it was not practicable to take samples within the period. Permit registrant is not required to sample outside of regular business hours or during unsafe conditions. Regular business hours are from 8 am to 5 pm on week days, unless the permit registrant specifies different hours in the SWPCP.

e. Monitoring Frequency - Permit registrants must monitor their stormwater discharge according to the frequency described in Table 4 below

i. Monitoring year is from July 1st to June 30th. The stormwater samples must be collected at least 14 days apart.

Magnitude: results in actual discharge

Interval Between Storms: n/a

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