4817 RUCKER AVE 2024-12-09 - Laserfiche WebLink

sunny skies, with a temperature of 50 degrees. The results of the field inspection are described in Task 4 below. TASK 4— DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS Upstream Conditions The project site lies on at a local high point in the basin. The high point is essentially the center of the parcel, creating two on-site basins. The westerly basin generates sheet flows to the west, into Rucker Ave., and the easterly basin sheet flows to the east, into Colby Ave. The field investigation verified that little, if any, off-site runoff contributes to the property. Downstream Conditions Site runoff sheet flows toward Rucker Avenue and Colby Avenue as described above. Runoff enters the combined sewer system on each of these streets, and continues northerly, as shown on the attached off-site basin map, through gradually increasing pipe sizes. At 43rd Street, the westerly system turns east, and combines with the easterly system at the intersection of 43rd and Colby Avenue. This point is approximately 1/3 mile downstream of the project site, creating 2 Threshold Discharge Areas (TDAs) for the project. At this point, the downstream system turns east and traverses through private property, ultimately crossing 415t Street in a 30" pipe. From this point runoff continues to the north and into the Everett Memorial Stadium property, approximately 1 mile downstream of the project site. There were no signs of hydraulic inadequacy in the downstream system within 1 mile of the subject property. Current land use in this downstream basin is a mix of residential and commercial. Soils in the basin are mapped as a combination of sands, loams, and hydric soils, according to the National Resource Conservation Service.