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• Contaminated surfaces shall be cleaned immediately following any discharge or spill <br /> incident. <br /> 111 <br /> • The contractor shall implement the following concrete and grout pollution control <br /> measures: <br /> • Process water and slurry resulting from concrete work will be prevented from entering <br /> the waters of the State by implementing Concrete Handling measures(BMP C151). <br /> The contractor shall implement the following Solid Waste pollution control measures: <br /> • Solid waste will be stored in secure, clearly marked containers. <br /> Element#10- Control Dewatering <br /> Foundation, vault, and trench de-watering water,which shall have similar characteristics to <br /> stormwater runoff at the site, shall be discharged into a controlled conveyance system prior to <br /> discharge to a sediment trap, pond, or other specified facility. Channels must be stabilized as <br /> specified in Element#8. <br /> Clean, non-turbid de-watering water, such as well-point groundwater, can be discharged to <br /> systems tributary to state surface waters, provided the de-watering flow does not cause <br /> erosion or flooding of receiving waters. These clean waters should not be routed through <br /> stormwater sediment ponds. <br /> Highly turbid or contaminated dewatering water shall be handled separately from <br /> stormwater. <br /> Element#11-Maintain BMPs <br /> All BMPs should be monitored and maintained regularly to ensure adequate operation. A <br /> TESC supervisor shall be identified at the beginning of the project to provide monitoring and <br /> direct the appropriate maintenance activity. As site conditions change, all BMPs shall be <br /> updated as necessary to maintain compliance with local regulations. <br /> Temporary BMPs can be removed when they are no longer needed. All temporary erosion <br /> and sediment control BMPs shall be removed within 30 days after construction is completed <br /> and the site is stabilized. <br /> Element#12-Manage the Project <br /> Erosion and sediment control BMPs for this project have been designed based on the <br /> following principles: <br /> • Design the project to fit the existing topography, soils,and drainage patterns. <br /> • Emphasize erosion control rather than sediment control. <br /> • Minimize the extent and duration of the area exposed. <br /> • Keep runoff velocities low. <br /> • Retain sediment on site. <br /> • Thoroughly monitor site and maintain all ESC measures. <br /> 1800 41st Street—Parking Expansion <br /> Drainage Report <br /> I <br />