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5. SOURCE CONTROL (MR #3) <br /> This project proposes to construct an addition to an existing SFR. Per Volume 1 of'the <br /> 2019 DOE manual, residential development does not require source control. <br /> 6: PRESERVATION OF NATURAL DRAINAGE SYSTEM (MR #4) <br /> The runoff from the site improvements will either be dispersed or infiltrated on site via a <br /> infiltration/dispersion trench. However, by not grading or compacting the majority of the <br /> pervious surfaces to remain after construction in the area of disturbance a maximum <br /> amount of site runoff from the developed project will be absorbed and infiltrated into the <br /> existing on-site soils. This will mimic the existing conditions by maintaining the existing <br /> direction and condition of flow from this site. <br /> 7. ON-SITE STORMWATER MANAGEMENT (MR #5) <br /> Due to the fact that the project site is located within the combined sewer area of the City of <br /> Everett, Section 6-10.1 of the City of Everett Design and Construction Standards and <br /> Specifications manual applies. According to this section, projects that have a total of 200 <br /> square feet or more of net new impervious surface or convert '/. acres or more of <br /> vegetation to lawn or- landscape; the project is required to -meet the Flow Control <br /> Performance Standard. This standard states "Stormwater discharges shall match <br /> developed discharge durations to existing site durations for the range of existing discharge <br /> rates from the 10-year peak flow through the full 100-year_peak..flow". Therefore, an <br /> infiltration/dispersion trench has been designed to disperse, infiltrate, or store all <br /> impervious surface runoff to meet this standard (see Section 8 for details). <br /> Lalone Addition 20-0902 <br /> October 2020 Page 10 <br />