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Stormwater Pollution Prevention Plan <br /> 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 temporary <br /> stabilization and inactive measures,the site inspection frequency can be reduced to once every <br /> month. <br /> 6.1.2 Site Inspection Documentation <br /> The site inspector will record each site inspection using the site log inspection forms provided in <br /> Appendix E. The site inspection log forms may be separated from this SWPPP document, but <br /> will be maintained on-site or within reasonable access to the site and be made available upon <br /> request to Ecology or the local jurisdiction. <br /> 6.2 Stormwater Quality Monitoring <br /> The construction site is greater than one acre in size, and does not discharge to an impaired water <br /> body, and is therefore subject to the general water quality monitoring requirements set forth in <br /> the 2011 Construction Stormwater General Permit(Appendix D). <br /> Samples are to be taken where stormwater associated with construction activity is discharged <br /> offsite. If there is no flow in these locations, the attempt to sample will be recorded in the site log <br /> book and reported to Ecology in the monthly Discharge Monitoring Report(DMR)as"No <br /> Discharge". Samples will be analyzed for turbidity using the EPA 180.1 analytical method. <br /> 6.2.1 Turbidity Sampling <br /> Monitoring requirements for the proposed project will include either turbidity or water <br /> transparency sampling to monitor site discharges for water quality compliance with the <br /> Construction Stormwater General Permit(Appendix D). Sampling will be conducted at all <br /> discharge points at least once per calendar week. <br /> Turbidity or transparency monitoring will follow the analytical methodologies described in <br /> Section S4 of the 2011 Construction Stormwater General Permit(Appendix D). The key <br /> benchmark values that require action are 25 NTU for turbidity(equivalent to 33 cm <br /> transparency) and 250 NTU for turbidity(equivalent to 6 cm transparency). If the 25 NTU <br /> benchmark for turbidity(equivalent to 33 cm transparency) is exceeded,the following steps will <br /> be conducted: <br /> 1. Ensure all BMPs specified in this SWPPP are installed and functioning as <br /> intended. <br /> 2. Assess whether additional BMPs should be implemented, and document <br /> revisions to the SWPPP as necessary. <br /> SWPPP Page 14 <br /> Delta Tidelands—Site Grading June 2016 <br />