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1�1�1�1�1�11 N Mr. Lorenzo Wingate IN INNHALFF City of La Porte ,1�1,1�1,1�1 August 4, 2022 Page 4 Attachment "A" The purpose of this proposal is to develop a PER, final design plans, and construction phase services for the Brookglen Subdivision Drainage Improvements project. The proposed project area can be seen in Attachment "C". SCOPE OF SERVICES Item 1: Preliminary Design Phase Services: The Preliminary Engineering Report will summarize findings from the drainage analysis and present alternative options to the City of La Porte for their approval. The PER may consider presenting the project in multiple phases based upon available funding. Preliminary Engineering Report services include: Project Management and Coordination a) Project management including invoicing, scheduling, and coordination with sub -consultants b) Conduct up to three (3) progress meetings with City of La Porte and HCFCD to discuss progress and results from the study. c) Perform QA/QC on all models and deliverables Data Collection a) Collect information from the City of La Porte and from other sources for the analysis including: • Terrain data • GIS shapefiles of storm sewer and other utilities • Available models and reports from previous studies in the area • Record drawings • Drainage complaint records b) Field Assessment — Conduct up to two (2) site visits to observe existing conditions and review potential project recommendations Drainage Analysis Existing Conditions a) Delineate subbasins for each inlet based on available record drawings and topography. Determine hydrologic parameters for each basin based on the City of LaPorte design criteria manual. b) Develop InfoWorks ICM ID/21) model for the neighborhood based on survey, field investigation, information collected from the City, and drainage basins. Model will include the inlets, storm sewer, HCFCD channels, and overland sheet flow. c) Simulate historical event will also be simulated at the request of the City to validate the model output. d) Simulated model for the 5-year, 10-year, and 100-year storm events using Atlas 14 rainfall. e) Evaluate system capacity and deficiencies and present existing results to the City. The existing conditions analysis will include the 100 ac-ft detention that is to be constructed by Pasadena and the two B512-02-00 Basins. Calculate the number of parcels/structures impacted, inundated areas, and middles of roadway impacted.