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Targeted Drainage Report — Twentieth Ave Substation <br />WO# 100026553 <br />Soils will be stabilized temporarily by application of cover measures such as straw or plastics where cover <br />measures are needed for unworked soils, 7 days during the dry season, 2 days during the wet season. <br />The disturbed area to be enclosed within the substation fence will be covered with gravel base (CSBC) as soon as <br />possible to further protect the underlying soils. <br />Element #6 — Protect Slopes <br />The slopes are designed to be at a 3:1 slope and a short length, track walking will be implemented to roughen <br />the slope and prevent riling. In the unlikely event that erosion becomes a problem wattles will be implement to <br />further control the runoff. <br />Element #7 — Protect Drain inlets. <br />Below grade inlet devices will be installed within the catch basins which could see runoff from the site. <br />Element #8 — Stabilize Channels and Qutlets <br />The swale to the north of the substation will have seed applied to provide permanent stabilization for the <br />minimal about of runoff it sees. <br />Element #9 —Control Pollutants <br />Spill prevention and control measures will be used if construction equipment requires on site fueling. Washout <br />of concrete trucks will be performed in a designated wash out areas. <br />Element #10 — Control De -Watering <br />Should it be necessary to dewater an excavation, a sediment control bag will be used at the discharging end of <br />the hose and the resulting runoff will percolate into the existing substation rock and slowly infiltrate. <br />Element #11 —Maintain BMPs <br />All BMPs will be maintained throughout the project as required to ensure their continued functioning. <br />Element #12 — Manage the Project <br />The project is less than one acre, therefore the construction stormwater general permit is not required. The site <br />will be inspected for conditions which could impact the quality of the stormwater as well and the effectiveness <br />of the erosion and sediment control measures. <br />Element #13 — Protect Low Impact Development BMPs <br />Not applicable. <br />2.3 MINIMUM REQUIREMENT #3 — Source Control of Pollution <br />Minimum requirement #3 is not applicable. The proposal only replaces an existing switchgear, which is not a <br />source of pollution. <br />Page 7 <br />