Res 2022-178R/authorizing a Change in Service to the agreement with HDR Engineering, Inc. relating to the Castle Forest Drainage Project

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Castle Forest Channel (CIP No.680) Engineering Design Services Scope and Fee The City of San Marcos (COSM) previously contracted HDR Engineering, Inc. (HDR) to develop a Preliminary Engineering Report(PER) to identify and mitigate the drainage issues in the Castle Forest Subdivision area. The PER dated January 6, 2022, was approved by the COSM and they have requested that HDR develop the plans, details and specification documents for Alternative 2, identified in the report. This document outlines the scope, schedule and fee associated with the development of the engineering design documents for the Castle Forest Channel (CIP No. 680). The proposed improvements include the following: • 3 storm-drain system extensions • 300 feet of channel conveyance improvements • 2 detention ponds The Castle Forest subdivision is downstream of a proposed residential development that HDR will consider in the H&H modeling updates as part of the design phase. It is assumed that flows from the offsite detention pond proposed by the upstream development can be re-configured to provide similar flows to the Castle Forest subdivisions, as seen in the PER,which will allow the Alternative 2 design to provide the flood risk reduction as proposed. During the H&H update, HDR will optimize the upstream development detention pond and if it is determined by HDR that portions of the proposed Alternative 2 improvements can be minimized or eliminated, they will incorporate additional design components provided in Alternative 1 of the PER, if agreed by COSM. Design components will be added to the design as long as the OPCC for all of the proposed Castle Forest Drainage improvements does not exceed the cost of Alternative 2 as outlined in the PER. Any infrastructure improvements above and beyond the Alternative 2 OPCC would not be part of this scope and be considered additional services. The design components may include storm drain system improvements, culvert improvements or channel conveyance improvements. The additional design request will not consider those that require real estate acquisition or additional permitting outside of the current scope of services. The scope to complete the work defined is as follows: I. Project Management a. HDR will attend one virtual Project Kick-off Meeting at the COSM and develop the project agenda and meeting minutes. b. HDR will attend project milestone meetings at the 60%, 90%and 100%submittals to review the comments provided by COSM and develop the project agenda and meeting minutes. c. HDR will prepare monthly progress reports and invoices for the project. d. HDR will provide project initiation, controls, and staff and sub-consultant coordination throughout the duration of the project. II. Data Collection a. HDR will conduct up to 2 site visits to observe field conditions and check survey data for reasonableness. b. HDR will manage the topographic survey data collection provided by sub-consultant. Topographic survey will include:culverts, trees (including diameter and species), curbs, storm drains, inlets, manholes, and city-owned and franchise utility appurtenances above ground or exposed (valves and meters, utility poles, etc.) in the project area. Existing