3217 HEWITT AVE SEPA 018 - 013 Land Use Decision Documents 2025-04-15

5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. The FEMA.gov website available through the Flood Map Service Center shows the site as"Area of Minimal Flood Hazards Zone X. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No. b. Ground Water: pH,II 1) Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well. Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals. . . ; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. c. Water runoff(including stormwater): 1) Describe the source of runoff(including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Cui lei illy, surtcace water galling on the povoilielit surroi.iiicing the tanks is collected in a strip drain and a second catch basin, directed through oil/water separators. After removal of the tanks, rainfall will be collected in the second catch basin and directed through the separator, unchanged. The strip drain will be removed. 2) Could waste materials enter ground or surface waters? If so, generally describe. No, Tire groundwater is already impacted by low concentrations of hydrocarbons, hence the tank removal and in-situ bioremediation of groundwater. Surface water will be collected and run through an oil/water separator as described above. Entire construction project anticipated to require 'I -2 months to complete. 3) Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. No, d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: SEPA Environmental checklist(WAC 197-11-960) July 2016 Page 6 of 16