2300 KASCH PARK RD 2025-07-28 - Laserfiche WebLink

., j Redeveloped Conditions One of the areas of work proposed consists of repaving an existing paved area at the west entrance to the Kasch Park Operating Base. The area to be reconstructed is currently paved with asphalt pavement and will be repaved with concrete to the same slopes and elevations as the existing surface. This entire area is graded to slope into the existing stormwater collection and conveyance system on site that then goes to the oil/water separator,detention system,and bioswale constructed as part of the master plan stormwater system. The reconstruction will not have any effect on the quantity, quality,or rate of stormwater flows from the area of construction. The area of repaving at the west entry is 11,465 square feet. The new on-site vehicle circulation drive aisle connecting the two existing paved areas will be constructed as a raised driveway across an existing on-site sidewalk. The wings will ramp up to sidewalk elevation then ramp back down to parking lot grades on the other side. Some landscaping will be removed and paved to accommodate this drive aisle. The work replaces landscaping with 545 square feet of pollution generating impervious surface and also replaces 160 square feet of existing impervious with pollution generating impervious surface. The runoff from this area will be collected in the existing storm drainage collection and conveyance system on site and routed to the on-site oil/water separator,detention system,and bioswale. Along a portion of the west edge of the bus layover area,a new curb is proposed to aid in keeping the buses on the pavement and out of the landscaping. The curb will be 1-foot wide and 379 feet long. The wider curb allows for better protection against bus wheels. A small amount of surface runoff is directed towards the grass strip along the edge of the pavement where it is designed to drain into the catch basin at the south end of the landscape strip and into the on-site flow control and water quality treatment systems. Since the buses have been wheel compacting the landscape strip,this landscape strip often has ponding water rather than reaching the catch basin. The drainage that will be collected at the new curb line will be collected in two new catch basins which will be installed on existing storm drain lines. The design drawings from the time that this bus layover area was constructed showed catch basins proposed in the same spot that we are proposing to build them right now. The storm drainage line and pavement were constructed per plan with the intent of the catch basin collection points but the catch basins were never installed. Other than the width of the curb there is no change to the impervious surface area and the runoff will still reach the oil/water separator,detention vault and bioswale as it does now. The entire layover area was accounted for in the full bus base build out. Community Transit Kasch Park Base 2