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41, <br /> MR 4 - PRESERVATION OF NATURAL DRAINAGE SYSTEMS <br /> The excavation is to be backfilled with gravel, which will preserve the naturally high infiltration <br /> capacity of the site. This will prevent any change to the current drainage patterns. <br /> MR 5 - ONSITE STORMWATER MANAGEMENT <br /> Stormwater will be managed using BMP T5.12: Sheet Flow Dispersion throughout the entire site. <br /> Under this BMP, the site will avoid concentrating flow and allow all stormwater to disperse and <br /> infiltrate over flat or moderately sloping surfaces. <br /> REFERENCES <br /> Pacific Groundwater Group(PGG),2019a.Everett Steel Site,Cleanup Action Plan,Everett Wash- <br /> ington,2019. <br /> PGG,2019b. Everett Steel Site, Stormwater Pollution Protection Plan, Everett Washington,2019. <br /> Everett Steel Stormwater Site Plan and Drainage Report 3 T <br /> AUGUST 2019 l+ <br />