"Tier 2 Revised Stormwater Pollution Control Plan Checklist" - Oregon

Tier 2 Revised Stormwater Pollution Control Plan Checklist is a legal document that was released by the Oregon Department of Environmental Quality - a government authority operating within Oregon.

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Tier 2 Revised Stormwater Pollution Control Plan Checklist
Instructions
Industrial Stormwater Discharge 1200-Z Permits
Tier 2 Parameters
Only exceedances of the geometric mean from statewide benchmarks are subject to Tier 2 corrective
action. Please see the tables below for a list of the statewide parameters and associated benchmarks.
Table 4 from the permit: Statewide Benchmarks
Total
Total
Total
Total
E. coli
pH
TSS
BOD
Georegion
Copper
Lead
Zinc
Phosphorus
organism/100
s.u.
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mL
Columbia
5.5-9.0
0.017
0.10
0.24
30
24
0.16
406
2
2
2
1
Slough
Portland
5.5-9.0
0.015
2
0.24
2
0.24
2
30
Harbor
Cascades
5.5-9.0
0.016
0.018
0.068
100
Coastal
5.5-9.0
0.017
0.039
2
0.086
100
Columbia
6.0-9.0
0.023
0.21
0.35
100
River
Mainstem
Eastern
5.5-9.0
0.031
0.077
2
0.16
100
Willamette
5.5-9.0
0.015
2
0.11
2
0.14
2
100
Valley
Marine
6.0-9.0
0.025
1.10
0.46
100
Waters
1
Columbia Slough dischargers are only subject to benchmark monitoring, no impairment monitoring
2
Applied regional translators
Monitoring point, Parameter and Corresponding Geometric Mean Exceedance
Please indicate the monitoring point, as identified on the Site Plan in your Stormwater Pollution
Control Plan and also on your Discharge Monitoring Report.
Please indicate the parameter, units and geometric mean associated with each monitoring point
exceedance.
Please note, if you are not sampling all of your stormwater discharge points and your pollution
control plan has identified substantially similar effluent based on a site analysis and/or
monitoring, then you must install the same treatment on those representative discharge points.
Once implemented, you must sample substantially similar discharge points for the parameters that
triggered Tier 2.
Projected Reduction of Pollutant Concentration Treated
Please provide the projected percent reduction in concentration for the proposed treatment measure
associated with the corresponding geometric mean exceedance. Regardless if a facility is proposing one
treatment system to address more than one geometric mean exceedance or multiple treatment measures
with the goal of reaching a single benchmark, please list the percent reduction for each parameter. The
projected percent reduction should reduce the pollutant discharged to or below the benchmark.
Created by: Krista Ratliff
Last updated: 7/21
Tier 2 Revised Stormwater Pollution Control Plan Checklist
Instructions
Industrial Stormwater Discharge 1200-Z Permits
Tier 2 Parameters
Only exceedances of the geometric mean from statewide benchmarks are subject to Tier 2 corrective
action. Please see the tables below for a list of the statewide parameters and associated benchmarks.
Table 4 from the permit: Statewide Benchmarks
Total
Total
Total
Total
E. coli
pH
TSS
BOD
Georegion
Copper
Lead
Zinc
Phosphorus
organism/100
s.u.
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mL
Columbia
5.5-9.0
0.017
0.10
0.24
30
24
0.16
406
2
2
2
1
Slough
Portland
5.5-9.0
0.015
2
0.24
2
0.24
2
30
Harbor
Cascades
5.5-9.0
0.016
0.018
0.068
100
Coastal
5.5-9.0
0.017
0.039
2
0.086
100
Columbia
6.0-9.0
0.023
0.21
0.35
100
River
Mainstem
Eastern
5.5-9.0
0.031
0.077
2
0.16
100
Willamette
5.5-9.0
0.015
2
0.11
2
0.14
2
100
Valley
Marine
6.0-9.0
0.025
1.10
0.46
100
Waters
1
Columbia Slough dischargers are only subject to benchmark monitoring, no impairment monitoring
2
Applied regional translators
Monitoring point, Parameter and Corresponding Geometric Mean Exceedance
Please indicate the monitoring point, as identified on the Site Plan in your Stormwater Pollution
Control Plan and also on your Discharge Monitoring Report.
Please indicate the parameter, units and geometric mean associated with each monitoring point
exceedance.
Please note, if you are not sampling all of your stormwater discharge points and your pollution
control plan has identified substantially similar effluent based on a site analysis and/or
monitoring, then you must install the same treatment on those representative discharge points.
Once implemented, you must sample substantially similar discharge points for the parameters that
triggered Tier 2.
Projected Reduction of Pollutant Concentration Treated
Please provide the projected percent reduction in concentration for the proposed treatment measure
associated with the corresponding geometric mean exceedance. Regardless if a facility is proposing one
treatment system to address more than one geometric mean exceedance or multiple treatment measures
with the goal of reaching a single benchmark, please list the percent reduction for each parameter. The
projected percent reduction should reduce the pollutant discharged to or below the benchmark.
Created by: Krista Ratliff
Last updated: 7/21
Tier 2 Checklist Instructions
Page 2
Percent of Design Storm Volume Infiltrated
Please provide the calculated percent of the design storm that will be infiltrated for the drainage basin
being addressed, if applicable. Facilities choosing to submit a Tier 2 Mass Reduction Waiver request need
to evaluate their site and show how the remaining mass load of pollutants discharged are at or below the
mass equivalent of the statewide benchmarks. In addition, provide the information requested in the Tier 2
Waiver table. This calculation may result in discharge above the benchmark values. The revised
Stormwater Pollution Control Plan must provide data and analysis to support this mass load analysis
determination, including the detailed description of the measure(s).
Design Storm Criteria
Precipitation Data
1. Determine the 2-year, 24-hour rainfall depth for the facility using latitude and longitude; this
information can be found here:
http://www.nws.noaa.gov/ohd/hdsc/noaaatlas2.htm
2. Determine the Water Quality Design Storm amount by locating your facility’s zone on the
Oregon Department of Transportation’s Water Quality Design Storm Factor map, attached below.
Multiply the 2-year, 24-hour storm rainfall depth from Step #1 by the appropriate factor (50%,
67%, or 75%). The majority of the state will use 50% of the 2-year, 24-hour rainfall depth. For
example, if the 2-year, 24-hour rainfall depth according to NOAA is 3.0 inches, and the facility is
in Zone 6 on the map below, 3.0 x 50% = 1.5 inches. The Design Storm amount is 1.5 inches.
3. Design to a minimum storm size of 0.7 inches in 24- hours in order to capture the first flush of
industrial pollutants, even if the calculation from Step #2 is fewer than 0.7 inches.
4. Compare the calculated Water Quality Design Storm to the facility’s local jurisdiction’s water
quality design storm and use whichever is more stringent.
Created by: Krista Ratliff
Last updated: 7/21
Tier 2 Checklist Instructions
Page 3
More information is available:
https://www.oregon.gov/ODOT/GeoEnvironmental/Pages/Hydraulics-
Manual.aspx
Please simply indicate the page numbers of the stamped plan or waiver for the following
items:
Rationale for the Selection of the Measures
The permits require the revised Stormwater Pollution Control Plan include data and analysis to
support the selection of each treatment best management practice or infiltration measure.
Schedule for Implementing Measure
Please include the expected implementation schedule for the proposed measures. The permit
deadlines include:
Submit a proposed Tier 2 corrective action response to DEQ or agent no later than December 31
(six months after the end of the full reporting year that triggered Tier 2) unless DEQ or agent
approved a later date.
Complete construction and implement treatment or mass reduction measures no later than Sept 30
(a year and nine months after the Tier 2 proposal corrective action response submittal deadline)
unless DEQ or agent approved a later date.
Cost of proposed Tier 2 Response
Created by: Krista Ratliff
Last updated: 7/21
Tier 2 Checklist Instructions
Page 4
As part of the rationale in the selection of the measures, the facility must consider cost. In order to
meet the implementation schedule, it is highly recommended that all proprietary, capital investment,
permitting, operational and maintenance, as well as energy costs are evaluated.
Treatment System Schematic
Please include design and site location information for proposed treatment measures. Registrants are
responsible for meeting water quality standards, including assurance that any chemical treatment is
nontoxic to aquatic organisms. Any state approved program may be cited, such as Technologies
Assessment Protocol - Ecology (TAPE).
Operation and Maintenance Schedule
All Tier 2 responses will require some maintenance overtime to optimize pollutant removal and
manage break-through. Break-through happens when media is clogged or no longer treats the
stormwater pollutants. Although each facility maintenance schedule will vary based on loading, this is
an important component of the revised Stormwater Pollution Control Plan. Schedule A.10.b.vii and
Schedule A.10.e outline maintenance and repairs which must be recorded and available for review
upon request of DEQ, agents or a local municipality. The revised Plan must include a projected
maintenance schedule. DEQ recognizes this may vary once installation is complete. Please ensure any
Plan revisions related to operations of control measures are submitted to DEQ or agents within 30
days calendar days after the change.
700 Lloyd Building at 700 NE Multnomah
165 East 7th Avenue, Suite 100
800 SE Emigrant Avenue, Suite 330
St., Suite #600,
Eugene, OR 97401
Pendleton, OR 97801
Portland, OR 97232
Clackamas
Benton
Lane
Baker
Hood River
Sherman
Clatsop
Coos
Lincoln
Crook
Jefferson
Umatilla
Columbia
Curry
Linn
Deschutes
Klamath
Union
Multnomah
Douglas
Marion
Gilliam
Lake
Wallowa
Tillamook
Jackson
Polk
Grant
Malheur
Wasco
Washington
Josephine
Yamhill
Harney
Marrow
Wheeler
AGENT OFFICES
City of Portland
Clean Water Services
City of Eugene
Bureau of Environmental Services
2550 SW Hillsboro Highway
Industrial Source Control
Water Pollution Control Laboratory
Hillsboro, OR 97123
410 River Ave.
6543 N. Burlington Ave.
Includes Banks, Beaverton, Cornelius,
Eugene, OR 97404
Portland, OR 97203-5452
Durham, Forest Grove, Gaston, Hillsboro,
King City, North Plains, Sherwood,
Tigard, Tualatin, and portions of
Washington Co.
Created by: Krista Ratliff
Last updated: 7/21
DEQ Industrial Stormwater Permits
Tier 2 Revised Stormwater Pollution Control Plan Checklist
Instructions: Complete this form and submit with the revised SWPCP and engineered plan or waiver request.
Fill in the requested information in the highlighted cells and the appropriate page number(s) indicating the
location of information in the revised SWPCP.
File No.:
Facility Name:
Comments (for official
Permit
Requirement
Page #
use only)
Schedule
Date Revised Plan submitted:
A.12.i
Percent of
Geometric
Percent
Design Storm
Monitoring Point Parameter
Mean
Units
Reduction in
Infiltrated or
Exceedance
Concentration
Injected
A.12.f
Proposed Tier 2 Corrective Action Response
A.12
Design storm in inches
Rationale for the selection of the measures
A.12.f.iii.1
A.12.i.iii
Schedule for implementing these measures
A.12.f.iii.2 Stamped by PE
Cost of installation
Treatment system schematic and operational plan
Operation and maintenance schedule for treatment measures
and/or volume reduction measures proposed
For DEQ or Agent use only
A.11
Revised SWPCP complete and acceptable
Notes:
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