ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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17 SECTION 7 - CONSTRUCTION SITE MONITORING PROGRAM SECTION 7.1 - PURPOSE The purpose of the CSMP is four-fold: to demonstrate site compliance with the Discharge Prohibitions, to determine whether non-visible pollutants are present and are causing exceedance of water quality objectives, to determine the necessary action steps to reduce pollutants in storm water discharges, and to determine whether BMPs included in the SWPPP are effective in preventing or reducing pollutants in storm water discharges. SECTION 7.2 - APPLICABILITY OF PERMIT REQUIREMENTS The 2009-0009-DWQ specifies risk-based monitoring and sampling requirements. Risk level 1 dischargers are not subject to numeric effluent standards, but visual monitoring is required. Generally, visual monitor is required weekly, within 48 hours of a qualifying rain event, during a qualifying rain event and within 48 hours after a qualifying rain event (a “Qualifying Rain Event” is any storm that causes ½ inch or greater precipitation.). Section 7.5 further details the requirements for visual monitoring. Risk Level 1 dischargers shall collect samples in the event of any breach, malfunction, leakage, or spill observed during a visual inspection. Sampling requirements are detailed in Section 7.6. Exemptions to the visual inspection, monitoring and sampling requirements are during dangerous weather conditions (flooding, electrical storms, etc.) and outside normal business hours. An explanation of these events shall be placed in this SWPPP (in Appendix H) and the Annual Report as to why inspections were not conducted. SECTION 7.3 - MONITORING LOCATIONS The contractor shall visually inspect all catch basins, BMPs, storage areas, containment areas, and any other areas that may potentially contribute or prevent pollutants from entering the storm drain system. Sampling is required only in the event where a non-stormwater discharge (i.e. sediment, oil, paint, etc.) is observed that may pollute stormwater. At catch basins, sample at the down gradient of inlet protection. For example, if a spill is believed to have discharged into a catch basin(s), the sample shall be taken at the inlet pipe of the next downstream catch basin or manhole. See the grading plan in Appendix M and erosion control plan in Appendix N for more information. SECTION 7.4 - SAFETY Safety at the construction site is the highest priority. Visual monitoring or sampling in conditions that pose signifcant safety risk are not required. However, the contractor must maintain a log of qualifying events where visual monitoring and/or sampling did not occur due to unsafe conditions. The following are examples of conditions where normal monitoring may be suspended: