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6.1.1 Site Inspection Frequency <br /> Site inspections will be conducted at least once a week and within 24 hours following any <br /> rainfall event which causes a discharge of stormwater from the site. For sites with <br /> temporary stabilization measures,the site inspection frequency can be reduced to once <br /> every month. <br /> 6.1.2 Site Inspection Documentation <br /> The site inspector will record each site inspection using the site log inspection forms <br /> provided in Appendix 2E. The site inspection log forms may be separated from this <br /> SWPPP document, but will be maintained on-site or within reasonable access to the site <br /> and be made available upon request to Ecology or the local jurisdiction. <br /> 6.2 Stormwater Quality Monitoring <br /> 6.2.1 Turbidity Sampling <br /> Monitoring requirements for the proposed project will include turbidity sampling to monitor <br /> site discharges for water quality compliance with the 2010 Snohomish County Drainage <br /> manual and Snohomish County Code Title 30.63A NPDES Construction Stormwater <br /> General Permit(Appendix 2D). Sampling will be conducted at all site discharge points at <br /> least once per calendar week. <br /> Turbidity monitoring will follow the analytical methodologies described in Section S4 of <br /> the 2005 Construction Stormwater General Permit(Appendix 2D). The key benchmark <br /> values that require action include 25 NTU and 250 NTU for turbidity. If the 25 NTU <br /> benchmark for turbidity is exceeded, the following steps will be conducted: <br /> II. Ensure all BMPs specified in this SWPPP are installed and functioning as <br /> intended. <br /> 2. Assess whether additional BMPs should be implemented and make revisions to <br /> the SWPPP as necessary. <br /> 3. Sample the discharge location daily until the analysis results are less than 25 <br /> NTU (turbidity)or 32 cm(transparency). <br /> If the turbidity is greater than 25 NTU but less than 250 NTU for more than 3 days, <br /> additional treatment BMPs will be implemented within 24 hours of the third consecutive <br /> sample that exceeded the benchmark value. Additional treatment BMPs will include, but <br /> are not limited to, off-site treatment, infiltration,filtration and chemical treatment. <br /> If the 250 NTU benchmark for turbidity is exceeded at any time, the following steps will be <br /> conducted: <br /> 1. Notify Ecology by phone within 24 hours of analysis. <br /> 2. Continue daily sampling until the turbidity is less than 25 NTU. <br /> 3. Initiate additional treatment BMPs such as off-site treatment, infiltration,filtration <br /> and chemical treatment within 24 hours of the first 250 NTU exceedance. <br /> 1800 41st Street—Parking Expansion <br /> Drainage Report <br /> I <br />