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from contacting materials that will contaminate stormwater runoff such as provide a covered area or berm <br /> to prevent clean stormwater from entering work or storage areas. <br /> Source control BMPs prevent contaminants <br /> from entering stormwater by controlling <br /> them at the source. <br /> Treatment BMPs <br /> In contrast, treatments BMPs are structures that treat stormwater to remove contaminants. Treatment <br /> BMPs typically require elaborate planning, design and construction. A stormwater pond for your <br /> subdivision is an example of a treatment BMP. No treatment BMP is capable of removing 100 percent of <br /> the contaminants in stormwater and the less contaminants in the stormwater prior to the treatment BMP, <br /> the more effective the BMP is. <br /> Also remember that,just because there is a stormwater collection system where you live, it does not <br /> necessarily mean that the stormwater is treated. Many developments were created prior to requirements <br /> to treat stormwater. The runoff from your property may go directly or indirectly to a stream or wetland <br /> without any treatment. <br /> Keep in mind that runofffrom your <br /> property may go directly or indirectly to a <br /> stream or wetland without any treatment. <br /> This manual will focus on source control BMPs applicable to the routine practices of most owners of a <br /> single family residence.. <br /> WHAT'S IN THIS MANUAL? <br /> This manual has been developed for the owners of single family residences. If you are trying to get a <br /> building permit to construct a new home you may be required to submit a copy of this manual, or its <br /> equivalent as part of your permit application and then record it with the Snohomish County Auditor's <br /> office prior to receiving final approval of your project. <br /> The manual is divided into three sections as follows: <br /> • Introduction <br /> • General Principles of Pollution Prevention <br /> • Best Management Practices for Single-Family Residences <br /> The general principles and best management practices described are based on the requirements of <br /> the Snohomish County Drainage Design and Erosion Control Manual,Volume IV—Source Control. <br /> 2 <br />