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culverts, mailboxes, driveways, and any other visible features located within the right -of -way. In <br />addition, Byrn & Associates will call One Call to identify all utilities within the project area and located <br />the right -of -way boundaries. <br />5. Pipelines (Water /Sanitary Sewer): <br />a. Determine Alignments: Using topographic survey information and available utility records, <br />proposed alignments for water, wastewater and storm water utilities will be identified. LAN will <br />identify potential conflicts with existing and proposed utilities, and determine methods of <br />construction. <br />b. Preliminary Hydraulics /Modeling: The existing 6 -inch water and wastewater lines will be upsized to <br />an 8 -inch size, and thus, no hydraulic modeling will be performed for these utilities. <br />6. Streets: <br />a. Cross - Section Alternatives: It is assumed that the existing pavement will be restored to match <br />existing conditions. The limits of pavement restoration will be minimized to include only the proposed <br />utility trenches. Thus, a geotechnical analysis and pavement design is not included in this scope. <br />Standard Trench Backfill and Pavement details will be utilized. <br />b. Complete Street Assessment: The existing Coers Drive does not include curb and gutter. As part of <br />the drainage analysis and assessment, proposed drainage improvements will be reviewed, which may <br />include recommendations for curb and gutter, or other improvements impacting the street or <br />proposed sidewalk improvements. <br />c. Sidewalks: A new 5 -foot concrete sidewalk, approximately 1050 LF extending from Old Ranch Road <br />12 to Owens Street, will be designed with these improvements. It is anticipated that the sidewalk <br />would be located on the west side of Coers Drive. <br />7. Drainage: <br />a. 2D Modeling Rapid Assessment: LAN will build a preliminary "rain -on- mesh" hydraulic 2- <br />dimensional hydraulic model to assess the flooding characteristics at the project site. This model will <br />be used as a tool to better understand the drainage patterns where undefined and erosive flow is <br />occurring and to quickly analyze proposed and optimized alternatives that best fix the problems at <br />the project site. The results of the 2D model will be presented to City staff to determine the best <br />proposed conceptual design for the Coers Drive region. Up to three (3) proposed alternatives will be <br />analyzed with the 2D model. <br />b. Preliminary Hydrology: LAN will utilize all available information to develop overall drainage <br />boundaries and build a hydrologic model for the project area. LAN will develop preliminary peak flow <br />rates for specified design storms according to City of San Marcos criteria for each proposed <br />crossing. Ditch flows will also be calculated for the identified design storms. Results of the <br />preliminary hydrology will be summarized in the Preliminary Engineering Report. <br />2 <br />