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Docusign Envelope ID: BB27E2CA-90E7-44DF-ACD6-60284C2E92F6 <br /> ATTACHMENT A <br /> CITY OF SAN MARCOS <br /> WALLACE ADDITION SUBDIVISION IMPROVEMENTS <br /> SCOPE OF SERVICES <br /> appurtenances, labels of existing utilities including size and material as well as fire <br /> hydrant and Valve IDs, and proposed flowline grade information. This proposal assumes <br /> that water service leads will be shown in plan view only up to the existing meter.All water <br /> lines 12-inch or larger will be shown in profile at 1" = 10' scale. Assumes plans will be at <br /> 1" =40'scale produced on 11"x17"sheets. It is anticipated that twenty two (22) sheets <br /> will be required to show all the potable water pipelines in the project. <br /> c. Streets, Driveways, and Sidewalks: Upon approval from the City, the Consultant will <br /> further develop the design of the streets, driveways, and sidewalks within the project <br /> area. The design will progress in greater detail at each subsequent deliverable within the <br /> design phase. Sheets will show plan and profile of proposed driveway,joint <br /> requirements, existing utility crossings, callouts for appurtenances, labels of existing <br /> utilities including size and material. Assumes plans will be at 1" = 40'scale for plan view <br /> and 1" = 10' scale for profiles, produced on 11"x17"sheets. It is anticipated that fifteen <br /> (15) sheets will be required to show all the streets in the project. <br /> d. Drainage Improvements: Upon approval from the City, the Consultant will further develop <br /> the drainage improvements within the project area. The design will progress in greater <br /> detail at each subsequent deliverable within the design phase. Detailed calculations <br /> such as routing program computations should be documented in a drainage report. Both <br /> 25 & 100-year storm events using Atlas 14 rainfall data Per Storm Water Technical <br /> Manual (STM) 3.2.1.6.3 will be used in calculations. Both "on-site" and <br /> "overall"/"downstream" calculations will be provided. Sheets will show plan and profile of <br /> proposed pipe,joint requirements, existing utility crossings, callouts for appurtenances, <br /> labels of existing utilities including size and proposed flowline grade information. <br /> Hydrologic calculations will be shown on plan sheets (drainage area, runoff <br /> coefficient/weighted curve number calculation, impervious cover, time of concentration, <br /> rainfall intensity/flow path, and peak runoff(flow) for each sub-basin). Assumes plans will <br /> be at 1" = 40'scale on plan view and 1" = 10' on profile view, produced on 11"x17" <br /> sheets. It is anticipated that fifteen (15) sheets will be required to show all the drainage <br /> improvements in the project. <br /> e. Drainage Area Map(s)will be created and updated throughout the design phases. The <br /> drainage area map will consist of an "Existing" Overall Drainage Area Map with existing <br /> drainage areas and topography shown with minimum 1' contour and a "Proposed" Overall <br /> Drainage Area Map with proposed drainage areas and topography shown with minimum <br /> 1' contour. In addition, on the on-site Proposed Drainage Area Map for smaller drainage <br /> areas captured such as sub-areas to each inlet will be shown. Flow direction arrows, <br /> Time of Concentration lines and type segments, &flow paths will be shown as well. <br /> Drainage Area Maps will indicate points of analysis where flow leaves the site that <br /> include flow comparison tables, existing versus proposed. FEMA Floodway and <br /> Floodplain Boundaries (ref. FIRM panel No. and date and pending CLOMR or LOMR <br /> case numbers) will also be shown. In addition, Water Quality and Buffer Zones per <br /> CoSM Land Development Code (LDC) Section 6.2.2 will be shown. The Drainage Area <br /> Map will show ordinary high-water mark in Waters of the US. Assumes plans will be at 1" <br /> = 40'scale produced on 11"x17"sheets. It is anticipated that up to two (2) sheets will be <br /> required to show all the drainage information calculated in the design. <br /> f. Structural/Retaining Walls: The Consultant will design of structural appurtenances and <br /> retaining walls needed to accommodate the drainage improvements the project. Typical <br /> retaining wall details will be developed, such that the Contractor can have sufficient <br /> information and detail to adjust the retaining wall as needed in the project site. <br /> 5 <br />