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California Street Parking Lot <br /> Stormwater Site Plan Report <br /> Minimum Requirement#6: Runoff Treatment: The project propose new parking lot area will replace <br /> about 12,250 sf of hard surface. The parking lot will be considered pollution generation hard surface <br /> (PGHS); however,the stormwater runoff will discharge to a combined sewer/stormwater and thus will <br /> be treated by the city. Prior to discharge from the site a catch basin with a floatable materials separator <br /> and gas trap (per COE standard drawing 414) shall be provided. <br /> Minimum Requirement#7: Flow Control: The proposed development will create and/or replace about <br /> 12,524 sf(0.287 ac) of hard (impervious) surface,thus meeting the 10,000 sf threshold for flow control. <br /> However, the project site is located within the City's combined sewer/stormwater area of the City. In <br /> accordance with the City's current policy for stormwater control in combined sewer/stormwater areas <br /> (Policy#2-11)the evaluation of the existing site conditions can be considered the existing site conditions <br /> (not forested land). The current site is completely covered by hard surface; therefor the site <br /> development will not increase the runoff flows due to the site development. In fact,the site will add <br /> some vegetated landscape areas and thus will reduce the runoff flows to the City system. <br /> Minimum Requirement#8: Wetlands Protection: No known wetlands or wetland buffers are located on <br /> or adjacent to the site. <br /> Minimum Requirement#9: Operation and Maintenance: An operation and maintenance summary is <br /> provided in Section 8 of this report. <br /> Job#19-035 Page 1-3 <br /> RAM Engineering, Inc. <br />