2300 MERRILL CREEK PKY OPUS NW 2018-01-01 MF Import

3.0 OG'F-SITG ANALYSIS � Upstrcam l3nsin As dic[atcd by topography, tl�crc is no upsVeam basin contribuung runoff ro the project sitc. At thc southcrn property linc oC the site, runoff tends to sheettlow eilher to the west or to the cast away from the project site. The project sitc on thc west side is completely devcloped and the east side tends to slope away from thc project site towards A`arbeck Creek. Downstrcam Busin As mentioned previously,die downstrcum drainage course for this project site is well documented by thc City of Lvcrett us there is :m cxisting 12-inch polyethylene pipe discharging from the project sitc off thc nonh-ccntral portion of thc sitc into a catch basin within thc right-of-way of Mcaill Crcek Parkway, which discharges ro tlie east into a 48-inch-diamcter dctcntion tank, which continucs to course easteriy in a 24-inch concrote pipc discharging to a camh basin on the south side of Mcrrill Creek Parkway where runoff is �hen coursed northwesterly undemeath Mcrrill Creck Parkway through 18-inch concrete pipe, discharging into a thickly woaled arefi by an energy dissipater riprap pad, which Narbeck Creek drains from. Narbeck Creek tends to drain along the eastern side of the project site in a northerly direction ;:nd the sitc dischazges to that creek on the north side oC Merrill Cmck parktvay. The City is well aware of thc Narbeck Creek downstream dr�inage coursc from this point. 3 ( 12230.00J.doc