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The benchmark for turbidity value is 25 nephelometric turbidity units (NTU) and a transparency <br />less than 33 centimeters. <br />If the discharge's turbidity is 26 to 249 NTU or the transparency is less than 33 cm but equal to <br />or greater than 6 cm, the following steps will be conducted: <br />1. Review the SWPPP for compliance with Special Condition S9. Make appropriate <br />revisions within 7 days of the date the discharge exceeded the benchmark. <br />2. Immediately begin the process to fully implement and maintain appropriate source <br />control and/or treatment BMPs as soon as possible. Address the problems within 10 <br />days of the date the discharge exceeded the benchmark. If installation of necessary <br />treatment BMPs is not feasible within 10 days, Ecology may approve additional time <br />when the Permittee requests an extension within the initial 10-day response period. <br />3. Document BMP implementation and maintenance in the site log book. <br />If the turbidity exceeds 250 NTU or the transparency is 6 cm or less at any time, the following <br />steps will be conducted: <br />1. Telephone or submit an electronic report to the applicable Ecology Region's <br />Environmental Report Tracking System (ERTS) within 24 hours. <br />https://www.ecology.wa.gov/About-us/Get-involved/Report-an-environmental-issue <br />• Northwest Region (King, Kitsap, Island, San Juan, Skagit, Snohomish, <br />Whatcom): (425) 649-7000 <br />2. Immediately begin the process to fully implement and maintain appropriate source <br />control and/or treatment BMPs as soon as possible. Address the problems within 10 <br />days of the date the discharge exceeded the benchmark. If installation of necessary <br />treatment BMPs is not feasible within 10 days, Ecology may approve additional time <br />when the Permittee requests an extension within the initial 10-day response period <br />3. Document BMP implementation and maintenance in the site log book. <br />4. Continue to sample discharges daily until one of the following is true: <br />• Turbidity is 25 NTU (or lower). <br />• Transparency is 33 cm (or greater). <br />• Compliance with the water quality limit for turbidity is achieved. <br />0 1 - 5 NTU over background turbidity, if background is less than 50 NTU <br />0 1 % - 10% over background turbidity, if background is 50 NTU or greater <br />• The discharge stops or is eliminated. <br />