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Kimley>»Horn <br />also accommodates drainage form the Mainplace Drive right-of-way and discharges into <br />the adjacent Caltrans North drainage system. <br />Discharge Point C (CP-C): Approximately 11.7 acres of the North-east portion of the site <br />(Ex-C1, Ex-C2), including surface parking and a portion of the existing Macy's building, <br />drains to a series of on -site inlets and drainage pipes. This portion of the private <br />drainage system discharges to the Main Street storm drain system. <br />Discharge Point D (CP-D): Approximately 7.2 acres of the site, comprising the south- <br />west parking lot (Ex-D1), drains to an existing on -site catch basin that connects to the <br />existing 30" City RCP. This RCP runs west under Mainplace Drive, accommodates <br />additional drainage from the Mainplace Drive right-of-way, and discharges to the <br />Caltrans South drainage system. <br />Discharge Point E (CP-E): The existing easterly parking structure, approximately 3.6 <br />acres, drains to existing on -site inlets and drains. This portion of the private drainage <br />system discharges to the Main Street storm drain system. <br />Discharge Point E2 (CP-E2): A portion of the on -site loop road, approximately 1.2 acres <br />drains to a City storm drain system in Broadway. The Broadway storm drain runs from <br />north to south and discharges directly into Santiago Creek. <br />3. Proposed (Post -development) Conditions <br />In the proposed condition, drainage will flow away from the proposed and existing <br />buildings and into one of several low points across the site. The existing private storm <br />drain infrastructure in the existing on -site ring road will largely remain in use. New <br />inlets will tie into the existing on -site private storm drain lines as each phase comes <br />online. Approximately 580' of offsite storm drain extension in Mainplace Drive will be <br />potentially be required to reroute flow around a proposed building at the west side of <br />the mall. <br />In order to maintain the historical drainage pattern, the connection points will remain <br />unchanged. The site drainage system in the proposed condition will be designed to <br />approximately maintain the size of the existing drainage tributary areas conveyed the <br />existing storm drain discharge points. The on -site drains will connect directly to City <br />drains, not directly to the Caltrans drainage system, nor directly to Santiago Creek. Only <br />City review of the proposed drainage will be required, according to the City. <br />Page 7 of 14 <br />