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4 Monitoring and Sampling Requirements <br /> Monitoring includes visual inspection, sampling for water quality parameters of concern, and <br /> documentation of the inspection and sampling findings in a site log book. A site log book will be <br /> maintained for all on-site construction activities and will include: <br /> • A record of the implementation of the SWPPP and other permit requirements <br /> • Site inspections <br /> • Stormwater sampling data <br /> The site log book must be maintained on-site within reasonable access to the site and be made <br /> available upon request to Ecology or the local jurisdiction. <br /> Numeric effluent limits may be required for certain discharges to 303(d) listed waterbodies. See <br /> CSWGP Special Condition S8 and Section 5 of this template. <br /> 4.1 Site Inspection <br /> Site inspections will be conducted at least once every calendar week and within 24 hours <br /> following any discharge from the site. For sites that are temporarily stabilized and inactive, the <br /> required frequency is reduced to once per calendar month. <br /> The discharge point(s) are indicated on the Site Map (see Appendix A)and in accordance with <br /> the applicable requirements of the CSWGP. <br /> 4.2 Stormwater Quality Sampling <br /> 4.2.1 Turbidity Sampling <br /> Requirements include calibrated turbidity meter or transparency tube to sample site discharges <br /> for compliance with the CSWGP. Sampling will be conducted at all discharge points at least <br /> once per calendar week. <br /> Method for sampling turbidity: <br /> Table 4—Turbidity Sampling Method <br /> ❑ Turbidity Meter/Turbidimeter(required for disturbances 5 acres or greater in size) <br /> Transparency Tube (option for disturbances less than 1 acre and up to 5 acres in size) <br /> 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 /> Page 121 <br />