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1 <br /> Drainage Report <br /> Boeing Everett-E-6 Parking Lot Expansion July 16,2013 <br /> when sediment has filled one-third of the available storage (unless a different standard is <br /> specified by the product manufacturer). The following inlet protection measures will be applied <br /> on this project: <br /> ' • BMP C220: Storm Drain Inlet Protection <br /> 4.8 Element#8—Stabilize Channels and Outlets <br /> Construction stormwater should only be discharged after passing through an appropriate <br /> sediment removal process. The use of silt fence and other pollutant removal devices should be <br /> strictly adhered to by the contractor to ensure no sediment laden stormwater enters conveyance <br /> systems. <br /> 4.9 Element#9—Control Pollutants <br /> All pollutants, including waste materials and construction debris, that occur onsite shall be <br /> handled and disposed of in a manner that does not cause contamination of stormwater. Good <br /> housekeeping and preventative measures will be taken to ensure that the site will be kept clean, <br /> well-organized, and free of debris. The following pollutant control measures will be applied on <br /> this project: <br /> • All vehicles, equipment, and petroleum product storage/dispensing areas will be <br /> inspected regularly to detect any leaks or spills, and to identify maintenance needs to <br /> prevent leaks or spills. <br /> 4.10 Element#10—Control De-Watering <br /> If necessary the contractor shall submit a dewatering plan for the project. It is not anticipated that <br /> a dewatering plan will be necessary as excavation will be primarily shallow and above the <br /> groundwater table of the site. <br /> 4.11 Element#11 —Maintain BMPs <br /> All temporary and permanent erosion and sediment control BMPs shall be maintained and <br /> repaired as needed to assure continued performance of their intended function. Maintenance and <br /> repair shall be conducted in accordance with each particular BMPs specification. <br /> All temporary erosion and sediment control BMPs shall be removed within 30 days after the <br /> final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped <br /> sediment shall be removed. <br /> 4.12 Element#12—Manage the Project <br /> Erosion and sediment control BMPs for this project have been designed based on the following <br /> principles: <br /> • Retain sediment onsite. <br /> • Thoroughly monitor site and maintain all ESC measures. <br /> ' • Emphasize protection of inlets to stormwater conveyance systems. <br /> The project will be managed according to the following key project components: <br /> I <br /> 20130715_Drainage Report_Boeing Everett_Gate E-6 Parking Lot.doc Page 11 <br /> I <br />