2012-03-12_PERMIT FILE - M2011028

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1). I'I,RMS AND C'ONDI"I IONS (cont.) d) Responsive SWMP Changes: SWMP changes addressing BMP installation and /or implementation are often required to he made in response to changing conditions. or when current I3MPs are determined ineffective. The majority of SWMP revisions to address these changes can he made immediately with quick in- the -tield revisions to the SWMP In the less common scenario where more complex development of materials to modify the SWMP is necessary. SWMP revisions shall be made in accordance with the following requirements• 6. Inspections 3) w hen BMPs are no longer necessary and are removed. PART 1 Permit - Page 12 Permit No ('OR- 030000 SWMP changes shall be made prior to changes in the site conditions, except as allowed for in paragraph d, below SWMP revisions may include, but are not limited to: potential pollutant source identification; selection of appropriate I3MPs for site conditions; BMP maintenance procedures; and interim and final stabilization practices. The SWMP changes may include a schedule for further BMP design and implementation, provided that, if any interim BMPs are needed to comply with the permit, they are also included in the SWMP and implemented during the interim period. I) the SWMP shall be revised as soon as practicable, but in no case more than 72 hours after the change(s) in BMP installation and /or implementation occur at the site, and 2) a notation must be included in the SWMP prior to the site change(s) that includes the time and date of the change(s) in the field, an identification of the BMP(s) removed or added, and the location(s) of those BMP(s). Site inspections must be conducted in accordance with the tbllowing requirements and minimum schedules. The required minimum inspection schedules do not reduce or eliminate the permittee's responsibility to implement and maintain BMPs in good and effecu\e operational condition. and in accordance with the SWMP. which could require more frequent inspections a) Minimum Inspection Schedule: The permittee shall. at a minimum. make a thorough inspection. in accordance with the requirements in I.D.6.b below. at least once every 14 calendar days. Also, post -storm event inspections must he conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. Provided the timing is appropriate, the post -storm inspections may be used to fulfill the 14 -day routine inspection requirement. A more frequent inspection schedule than the minimum inspections described may be necessary. to ensure that BMPs continue to operate as needed to comply with the permit. The following conditional modifications to this Minimum Inspection Schedule are allowed: I ) Post -Storm Event Inspections at Temporarily Idle Sites -- l i n o construction activities will occur following a storm event. post -storm event inspections•shall be conducted prior to re- commencing construction activities, but no later than 72 hours following the storm event. The occurrence of any such delayed inspection must be documented in the inspection record. Routine inspections still must be conducted at least every 14 calendar da■ s. 2) inspections at Completed Sites /Areas — For sites or portions of sites that meet the following criteria. but final stabilization has not been achieved due to a vegetative cover that has not become established. the permittee shall make a thorough inspection of their stormwater management system at least once every month. and post - storm event inspections are not required. This reduced inspection schedule is only allowed if: i) all construction acti■ ities that will result in surface ground disturbance are completed: I ) all aeti ities required for final stabilization, in accordance with the SWMP. have been completed. with the exception of the application of seed that has not occurred due to seasonal conditions or the necessity for additional seed application to augment prey sous efforts; and iii) the SWMP has been amended to indicate those areas that will be inspected in accordance with the reduced schedule allowed for in this paragraph.