Guidance for Filling out the Proposed New Discharge to and Impaired Water Body Form

Guidance for Filling Out Proposed New Discharge to an Impaired Water Body Form July 2012

CSWGP special Sources: Ponding of stormwater prior to discharge, lack of shading, ashalt, concrete or CSWGP1 requirements Temperature requirements if rip-rap lined channels may contribute to the warming of stormwater. if 303(d) listed: NA TMDL listed: NA

USE IF: Due to site characteristics and time of year, warm discharge is not expected Pollutant is not present on-site (PNDIWB2 Form Option 2a) DO NOT USE IF: Warm stormwater may discharge to the impaired water body Pollutant may be/is present on-site but actions will be taken USE IF: Warm stormwater may discharge to the impaired water body to prevent exposure and discharge (PNDIWB Form Option 2b) DO NOT USE IF: Warm stormwater will discharge to the impaired water body Pollutant is on-site but discharge is not expected to cause/ USE IF: Warm stormwater will discharge to the impaired water body contribute to an exceedance of water quality standards (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

1 Department of Ecology. National Pollutant Discharge Elimination System Construction Stormwater General Permit (NPDES CSWGP). http://www.ecy.wa.gov/programs/wq/ stormwater/construction/permitdocs/cswgppermit120110.pdf

2 Department of Ecology. Construction Stormwater General Permit Proposed New Discharge to an Impaired Water Body – form ECY 070-399 Guidance for Filling Out Proposed New Discharge to an Impaired Water Body Form July 2012

CSWGP special CSWGP1 requirements Sources: Abundance of pollution (sediments, organic matter and/or nutrients) in the requirements if if 303(d) listed: low Dissolved Oxygen system, excessive algal blooms, warm water temperatures and low water flow can TMDL listed: NA NA unless tied to reduce oxygen levels. unless tied to phosphorus phosphorus

No known sources of dissolved oxygen reducing materials, above natural USE IF: conditions, exist on-site Pollutant is not present on-site (PNDIWB2 Form Option 2a) Nutrient sources or other dissolved oxygen reducing materials are or will be DO NOT USE IF: present on site Nutrient will be used or stored on-site that could lead to excessive nutrient concentrations in construction discharge. BMPs will be used to protect USE IF: Pollutant may be/is present on-site but actions will be taken soil and stormwater will be infiltrated or treated prior to discharge to the to prevent exposure and discharge (PNDIWB Form Option 2b) impaired water body Nutrient sources or other dissolved oxygen reducing materials are or will be DO NOT USE IF: present on-site and exposure to stormwater and discharge will/may occur Nutrient sources or other dissolved oxygen reducing materials are or will be Pollutant is on-site but discharge is not expected to cause/ USE IF: contribute to an exceedance of water quality standards present on-site and exposure to stormwater and discharge will/may occur (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

Sources: TPHs come from crude oil and are a mixture of chemicals, but they are all made mainly from hydrogen and carbon, called hydrocarbons. Crude oil is used to make CSWGP special Total Petroleum petroleum products, which can contaminate the environment. CSWGP1 requirements requirements if Hydrocarbons (TPHs) if 303(d) listed: NA TMDL listed: NA Conveyance: Leaky equipment or vehicles, petroleum spills, lack of secondary containment.

USE IF: NA Pollutant is not present on-site (PNDIWB2 Form Option 2a) DO NOT USE IF: Petroleum products will be used or stored on-site Petroleum products will be used or stored on-site but efforts will be made to USE IF: Pollutant may be/is present on-site but actions will be taken avoid contact with stormwater prior to discharge to prevent exposure and discharge (PNDIWB Form Option 2b) Petroleum products will be used or stored on-site and TPH contaminated DO NOT USE IF: stormwater could discharge to the impaired water body Petroleum products will be used or stored on-site and TPH contaminated Pollutant is on-site but discharge is not expected to cause/ USE IF: contribute to an exceedance of water quality standards stormwater could discharge to the impaired water body (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

Sources: The United States banned the manufacture of PCBs and most of the pesticides of concern (such as DDT, DDE, and DDD) are no longer used but they persist in the environment for a long time and levels can build up in soils and wildlife due to bioaccumulation and deposition. PCBs come from coolants and lubricants in electrical equipment. Dioxin compounds are not created intentionally, but are formed inadvertently by a number of human and natural activities. These activities include combustion and CSWGP special Toxics (PCBs, Dioxins incineration, forest fires, chlorine bleaching of pulp and paper, certain types of chemical CSWGP1 requirements requirements if and Pesticides) manufacturing and processing, and other industrial processes. Pesticides and insecticides if 303(d) listed: NA TMDL listed: NA such as Dieldrin, Heptachlor, and Heptachlor Epoxide, have also been banned for commercial/private use due to environmental concerns.

Conveyance: PCBs, dioxins, and pesticides are known to bind to sediment, therefore, sources may be conveyed during construction by soil disturbance and erosion leading to turbid discharges.

USE IF: No known sources exist on-site Pollutant is not present on-site (PNDIWB2 Form Option 2a) PCBs, pesticides, herbicides and insecticides may be present on site but no DO NOT USE IF: known sources exist PCBs, pesticides, herbicides and insecticides may be present on site but no USE IF: Pollutant may be/is present on-site but actions will be taken known sources exist to prevent exposure and discharge (PNDIWB Form Option 2b) Known source is on-site and efforts will be made to prevent discharge of DO NOT USE IF: contaminated stormwater Known source is on-site and efforts will be made to prevent discharge of Pollutant is on-site but discharge is not expected to cause/ USE IF: contribute to an exceedance of water quality standards contaminated stormwater (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

Sources: Leaky/failing septic systems, unmaintained porta-potties and pet or human feces, wildlife waste attracted by feeding, or offsite water from adjacent land use (failing septic CSWGP special system, hobby farm, goose pond, etc.). CSWGP1 requirements Fecal Coliform requirements if if 303(d) listed: NA TMDL listed: NA Conveyance: Known to bind to sediment so it may be conveyed during construction by soil disturbance and erosion leading to turbid discharges.

USE IF: No known sources, above natural conditions, exist on-site Pollutant is not present on-site (PNDIWB2 Form Option 2a) 1) decomissioning septic systems; 2) adjacent land use could add FC from DO NOT USE IF: offsite; 3) working on or around uncovered sanitary sewer lines 1) decomissioning septic systems; 2) adjacent land use could add FC from USE IF: Pollutant may be/is present on-site but actions will be taken offsite; 3) working on or around uncovered sanitary sewer lines to prevent exposure and discharge (PNDIWB Form Option 2b) Known fecal coliform source is on-site and efforts must be made to prevent DO NOT USE IF: discharge of fecal coliform contaminated stormwater Known fecal coliform source is on-site and efforts must be made to prevent Pollutant is on-site but discharge is not expected to cause/ USE IF: contribute to an exceedance of water quality standards discharge of fecal coliform contaminated stormwater (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

Nitrogen (sometimes CSWGP special Sources: High-nitrogen fertilizers, failing septic systems,unmaintained porta-potties, CSWGP1 requirements referred to as requirements if human and animal feces if 303(d) listed: NA Ammonia-N) TMDL listed: NA

USE IF: Nitrogen sources are not present on-site Pollutant is not present on-site (PNDIWB2 Form Option 2a) DO NOT USE IF: Nitrogen sources are or will be present on-site Nitrogen sources are or will be present on-site but actions will be taken to USE IF: Pollutant may be/is present on-site but actions will be taken prevent discharge to prevent exposure and discharge (PNDIWB Form Option 2b) Nitrogen sources are or will be present on-site and exposure to stormwater DO NOT USE IF: and discharge will/may occur Nitrogen sources are or will be present on-site and exposure to stormwater Pollutant is on-site but discharge is not expected to cause/ USE IF: contribute to an exceedance of water quality standards and discharge will/may occur (PNDIWB Form Option 2c) DO NOT USE IF: Option 2a or 2b applies

Sources: Naturally occuring from CSWGP special requirements if TMDL listed: 1) Where an applicable weathered rock and soil particulate TMDL sets specific waste load allocations or requirements for matter, compost can increase discharges covered by this permit, dischargers must conduct sampling phosphorus concentrations in in accordance with Special Condition S8.E; Specific requirements will CSWGP1 requirements if stormwater, and phosphorus be/are established by the applicable TMDL; or 2) Where an applicable 303(d) listed: Conduct turbidity fertilizers can be a source. Excessive TMDL has established a general waste load allocation for construction sampling in accordance with phosphorus can lead to a dissolved stormwater discharges, but has not identified specific requirements, Phosphorus Special Condition S8; 25 NTU oxygen impairment. comply with Special Conditions S4 (Monitoring) and S9 (SWPPPs); or effluent limit at the discharge 3) Where an applicable TMDL has not specified a waste load allocation point or compliance with water Conveyance: It is known to bind for construction stormwater discharges, but has not excluded these quality standards for turbidity. to sediment and may be conveyed discharges, comply with Special Conditions S4 (Monitoring) and S9 during construction by soil (SWPPPs); or 4) Where an applicable TMDL specifically precludes or disturbance and erosion leading to prohibits discharges from construction activity, the operator is not turbid discharges. eligible for coverage under the permit.

USE IF: NA 1) Project will disturb soil and turbid water will/may discharge to the Pollutant is not present on-site (PNDIWB2 Form Option 2a) impaired water body; and/or 2) discharge to impaired water body is exposed DO NOT USE IF: to compost prior to discharge; and/or 3) phosphorus fertilizer will be used in proximity to the discharge point BMPs will be used to protect soil and turbid stormwater will be infiltrated USE IF: and/or not allowed to discharge to the impaired water body Pollutant may be/is present on-site but actions will be taken 1) Project will disturb soil and turbid water will/may discharge to the to prevent exposure and discharge (PNDIWB Form Option 2b) impaired water body; and/or 2) discharge to impaired water body is exposed DO NOT USE IF: to compost prior to discharge; and/or 3) phosphorus fertilizer will be used in proximity to the discharge point Pollutant is on-site but discharge is not expected to cause/ USE IF: Turbid stormwater could discharge to the impaired water body contribute to an exceedance of water quality standards (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

Sources: Disturbed sediment is CSWGP special requirements if TMDL listed: 1) Where an applicable susceptible to erosion. Suspended TMDL sets specific waste load allocations or requirements for CSWGP1 requirements material (sediment, organic matter, discharges covered by this permit, dischargers must conduct sampling if 303(d) listed: etc.) in the water can be naturally in accordance with Special Condition S8.E; Specific requirements will Conduct turbidity occuring or caused/exaccerbated be/are established by the applicable TMDL; or 2) Where an applicable sampling in by human activities. TMDL has established a general waste load allocation for construction Total suspended solids accordance with stormwater discharges, but has not identified specific requirements, (TSS)/Turbidity/Fine Special Condition Conveyance: Sediment or other comply with Special Conditions S4 (Monitoring) and S9 (SWPPPs); or sediment S8; 25 NTU effluent material may be conveyed during 3) Where an applicable TMDL has not specified a waste load allocation limit at the discharge construction by soil disturbance for construction stormwater discharges, but has not excluded these point or compliance and erosion leading to turbid discharges, comply with Special Conditions S4 (Monitoring) and S9 with water quality discharges. Runoff from roadways (SWPPPs); or 4) Where an applicable TMDL specifically precludes or standards for turbidity. or impervious surfaces are another prohibits discharges from construction activity, the operator is not possible conveyance. eligible for coverage under the permit.

USE IF: NA Pollutant is not present on-site (PNDIWB2 Form Option 2a) Project will disturb soil and turbid water will/may discharge to the impaired DO NOT USE IF: water body BMPs will be used to protect soil and turbid stormwater will be infiltrated USE IF: Pollutant may be/is present on-site but actions will be taken and/or not allowed to discharge to the impaired water body to prevent exposure and discharge (PNDIWB Form Option 2b) DO NOT USE IF: Turbid stormwater could discharge to the impaired water body Pollutant is on-site but discharge is not expected to cause/ USE IF: Turbid stormwater could discharge to the impaired water body contribute to an exceedance of water quality standards (PNDIWB Form Option 2c) DO NOT USE IF: Option 2b applies

CSWGP special requirements if TMDL listed: 1) Where an applicable TMDL sets specific waste load allocations or requirements for discharges covered by this permit, dischargers must conduct sampling in accordance with Special Condition S8.E; Specific requirements will be/are established by the applicable TMDL; or 2) Sources: Any pH modifying CSWGP1 requirements if 303(d) Where an applicable TMDL has established a general waste load allocation for substance (such as concrete, listed: Conduct pH sampling construction stormwater discharges, but has not identified specific requirements, pH recycled concrete, acid), highly and comply with the numeric comply with Special Conditions S4 (Monitoring) and S9 (SWPPPs); or 3) Where acidic rainfall, decomposition of effluent limit of pH 6.5 to 8.5 an applicable TMDL has not specified a waste load allocation for construction organic material (biomass) standard units (su) stormwater discharges, but has not excluded these discharges, comply with Special Conditions S4 (Monitoring) and S9 (SWPPPs); or 4) Where an applicable TMDL specifically precludes or prohibits discharges from construction activity, the operator is not eligible for coverage under this permit.

High pH Low pH pH modifying substances will not be used or stored on-site The project will not be using or storing pH USE IF: (e.g. concrete, etc.) modifying substances on-site (e.g. acid, etc.) Pollutant is not present on-site (PNDIWB2 Form Option 2a) 1) Project will be using or storing pH modifying DO NOT USE IF: pH modifying substances will be used or stored on-site substances on-site, and/or 2) pH neutralization of construction stormwater will be performed BMPs will be used to prevent stormwater from coming in contact with pH modifying substances and/or curing pH neutralization will be achieved using methods USE IF: Pollutant may be/is present on-site but concrete, and/or high pH stormwater will be handled in prescribed in WSDOT’s Highway Runoff Manual.3 actions will be taken to prevent exposure accordance with WSDOT’s Highway Runoff Manual.3 and discharge (PNDIWB Form Option 2b) pH modifying substances will be used in or near the DO NOT USE IF: NA impaired water body with contact and discharge likely Pollutant is on-site but discharge is not pH modifying substances will be used in or near the USE IF: NA expected to cause/contribute to an impaired water body with contact or discharge likely exceedance of water quality standards (PNDIWB Form Option 2c) DO NOT USE IF: Option 2a or 2b applies NA

1 Department of Ecology. National Pollutant Discharge Elimination System Construction Stormwater General Permit (NPDES CSWGP). http://www.ecy.wa.gov/programs/wq/stormwater/construction/ permitdocs/cswgppermit120110.pdf

2 Department of Ecology. Construction Stormwater General Permit Proposed New Discharge to an Impaired Water Body – form ECY 070-399

3 WSDOT. Highway Runoff Manual. Section 6A-2.33. http://www.wsdot.wa.gov/publications/manuals/fulltext/M31-16/HighwayRunoff.pdf