10521 19TH AVE SE 2022-05-23 - Laserfiche WebLink

Silver Lake Plaza Element # 10: Control De -Watering De -watering of the site is not expected. If dewatering of the site is needed, all groundwater removed pumped and discharged through a filtering sock and drain into interceptor trenches on site and/or hauled to a City approved site. Element # 11: Maintain BMP's All Temporary Erosion and Sedimentation Control (TESC) devices and equipment will be inspected and maintained on a weekly basis if not sooner, based on storm events contributing to runoff. When construction is complete and the site is stabilized, any existing sediment will be removed and stabilized onsite. Element # 12: Manage the Project A general construction manager will manage the project for or by the owners. The construction manager shall maintain all of the above items in order to minimize sediment transport and turbid water leaving the site. His job will entail continual observation of the grading operations to ensure minimal effects to adjacent properties and offsite waterways. Element # 13: Protect On -Site Stormwater Management BMPs On -site stormwater BMPs primarily consist of soil amendments. Future soil amendment areas will be protected against compaction where feasible. Minimal Requirement # 3: Water Pollution Source Control All proposed development is commercial construction consisting mainly of non -pollution generating runoff and parking lot pavement with water quality BMPs. Runoff from the proposed dumpster area located near the southeast corner of the parking/driving area will be collected by a catch basin located within the dumpster area. The collected dumpster area runoff will be connected to the side sewer. No chemical or industrial type of water pollution is expected from this project. Minimum Requirement # 4: Preservation of Natural Drainage Systems and Outfalls, and provisions of off -site mitigation No changes to the existing drainage systems and outfalls are proposed with this development. Upstream and Developed runoff from the project is to drain into the existing drainage course located in the underground storm system along the east side of 19t" Ave SE. Minimum Requirement #5 On -Site Storm Water Management Due to the project proposing more than 10,000 sf. of new hard surfaces, Minimum Requirements #1 through #9 must be met. Because the project is within the UGA and on a parcel less than 5 acres, the project must meet either the Low Impact Development Performance Standard or List #2 in section 2.5.5 of Volume I of the SMMWW. This project has chosen to fulfill the requirements of List #2. Note that according to the "Geotechnical Engineering Report" by Robinson Noble, Inc infiltration is not recommended. Refer to feasibility list below for appropriate BMP selection or infeasibility description: WESTERN ENGINEERS, INC. 13 PROJECT: 15-1415-A