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� � � • • • � • <br /> c'onatractioo Source Control BMP's• <br /> P+�e 9 consists of the Constructan Site Aciivities Checklist from the City of Everctt's <br /> Stormwater Maeagement Manual. There arc two items of concem that should be addressed. <br /> 'I7ie first is the po!eMial use of nutrients or feRilizers,and the second is the vvashing of <br /> construction equipment. <br /> NUTRIENT APPLICATION AND CONTROL: <br /> Inorganic nutrient pollution is most often caused by fertiliaers used in revegetating <br /> graded areas. Proper soil-stabili7ation mcasures, sediment conhul,and stortnwater detention <br /> structures should be used to keep tl�ese materials out of waterway�. <br /> Nutrient pollution can be minimized by working fertilizers and liming materials into tbe <br /> soil to depths of 4 to 6 inches, and by proper timing of the application. Control of nutrients can <br /> be achieved by applying the required quantity of fertilizer in more than oi:.A operatioa Hydro- <br /> seeding produces more nutrient pollution tban conventional seodbed prep��urstan operaLions. <br /> Use of feriilizers containing little or no phosphorus may be required by the City if tbe <br /> development is t►ear sensitive water bodies. In any eveM,care should be teicen to use oely the <br /> minimum amount of phosphotus needed, as determined by soil tests or advice from the local <br /> Conservation District or Soil Conservation Scrvice. <br /> The addition of lime can affect the pH (or acidity)of runoff, which�.�n ad��crsely affect <br /> nearby sensitive surface waters. Importation of topsoil is preferted over heavily liming and <br /> fertilizing exposed subsoil. <br /> EQUIPMENT WASHING: <br /> Lazge construction equipment and paRs should only be cleaned at the coatractor's yazd, <br /> where waste water can be properly treated prior to discharge to the sanitary sewer system <br /> Small parts can be clearted with degreasing solvents and detergents wluch ere reused afte� <br /> filtering or recycicd. T'hese solvents may not be discharged into any sewer, sa►utary or stoTm. <br /> Further information is available from the Departr*eM of Ecobgy. <br /> Without proper maintenance of stormwater fecilities, sediment and other debris can <br /> quickly clog facilities, making them osekss. Rehabilitation of such facilities is d'�$'icuh and <br /> expensive. Polluted water and sediments temoved during the cleaning operation must be <br /> properly disposed of. Stormwater treatment facilities st�all be maintained a�ordiog to criteria or <br /> procedures presented in the City of Everett's Stormwater Management Manual Section 3-1. <br /> / <br /> I � <br />