19E - SANTA ANA GRADE SEPARATION PROJECT

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Santa Ana Blvd. Grade Separation shoofly tracks east of existing railroad tracks. Nine parcels will require full acquisition, three parcels will require partial acquisition, and ten parcels will require temporary construction easements. Due the preliminary nature of this study, individual property owners were not consulted to determine the extent of the impacts to their properties. Full acquisition of a parcel is assumed where the proposed shoofly or detour road will impact an existing building, otherwise, temporary construction easements are assumed. Refer to Attachment G for a breakdown of the right -of -way requirements. 5.6 Drainage The drainage designs for the preferred alternative of the project follows the current Orange County Hydrology Manual (1986) and City of Santa Ana engineering design standards. Generally, 100 -year and 25 -year storm water discharges will be studied for sump conditions and gravity /flow -by conditions respectively. The project site currently receives surface flows generally from northeast to southwest by means of street flow. There is an existing storm drain system consisting of a 24 -inch reinforced concrete pipe (RCP) and catch basins at Santa Ana Boulevard near the existing railroad at -grade crossing that receives surface flow from the project site and offsite flows from north of Santa Ana Boulevard. The project site runoff then drains to Santa Ana Delhi Channel and eventually discharges to Upper Newport Bay and Lower Newport Bay. In the proposed condition, a pump station and new catch basins are proposed to collect runoff in the newly created sump along Santa Ana Boulevard. The outflow from the pump station will be discharged to the existing 24 -inch drainage system along Santa Ana Boulevard west of the project limit. A portion of the existing 24 -inch RCP conflicting with the proposed improvements will be removed and a drainage system will be reestablished between the existing drainage system and the pump station. It is noted that the exact location and configuration of the pump station will be determined in the next phase of the project as details of the SARTC Master Plan and Street Car Corridor become available. Tentatively, the pump station is located next to the Fuller Street cul -de -sac since this is the area least impact by future SARTC expansion. The drainage pattern at Santiago Street near the project is not anticipated to be changed; however, additional catch basins should be considered at the northeast corner of the Santa Ana Boulevard / Santiago Street intersection to reduce surface flow traveling toward the proposed sump. The street flow along Logan Street and Lincoln Avenue north of Santa Ana Boulevard will be captured by an at grade swale before the underpass. 5.7 Utilities Refer to Attachment H for exhibits showing existing and proposed utilities. There are numerous existing utilities within the project footprint. Based on field investigation, as -built plan research, and coordination with various utilities owners, the existing utilities are summarized below. City of Santa Ana: 12" waterlines: A 12" waterline runs east -west along the Santa Ana Boulevard. It ties into a 16" waterline to near the intersection of the Santa Ana Boulevard and Santiago Street and tees into a 20" waterline running north -south direction along the Fuller Street to the east. A 20" waterline continues to the east under Santa Ana Boulevard until it connects to the 16" waterline along Grand Avenue. PROJECT REPORT EQUIVALENT 19E-19 10