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1 <br />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 />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 in the Consent Decree (see Appendix C) <br />and in accordance with the applicable requirements of the CSWGP and the Consent Decree. <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 8 — Turbidity Sampling Method <br />x <br />Turbidity Mete r/Turbidimeter (required for disturbances 5 acres or greater in size) <br />❑ <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 />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 />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />ae �22 <br />r,� <br />