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Mr. Lorenzo Wingate City of La Porte August 31, 2021 Page 3 Attachment ÐAÑ The purpose of this proposal is to complete a study phase, develop final design plans, and provide construction phase services for the 100 Acre-Foot Interlocal Detention Pond project. The proposed project area can be seen in Attachment ÐCÑ. The proposed project schedule can be found in Attachment ÐDÑ, and will be updated as needed. SCOPE OF SERVICES Study Phase Services: Task 1: Impact Analysis Report Halff will conduct an impact analysis and submit a report to the HCFCD for formal approval. Tasks will include: a) Project Management Î Conduct regular progress meetings and conference calls with City staff. Conduct a pre-submittal meeting with HCFCD to present the project. Conduct up to two (2) presentations to City Council. b) Data Collection Î Review previous HCFCD model and documentation for Armand Bayou Watershed Protection Plan (ABWPP). Conduct one site visit to understand existing site conditions. Should multiple site visits be necessary, the City will not be charged an additional fee. c) Existing Conditions Update Î Update the existing conditions H&H model from the ABWPP in preparation for the proposed 100-acre-foot detention facility including revision of cross sections and update of land use near the proposed facility. Scope assumes that the existing conditions model will only require minor updates. d) Proposed Conditions Analysis Î Analyze up to two (2) pond configurations of the detention facility based on design constraints and discussions with City Staff including preliminary grading of the facility. Incorporate upstream proposed projects as provided by the HCFCD as part of the ABWPP. Coordinate with HCFCD regarding the proposed improvements. e) Estimate Probable Construction Costs Î Develop an opinion of probable construction cost using preliminary grading and known utility information for the project. A 30% contingency will be included for this phase of the project. f) Impact Analysis Report Î Summarize the impact analysis and submit a draft and final drainage report to the City of La Porte for approval. Upon approval by the City, submit a sealed drainage report to the HCFCD. g) Quality Control Î Perform QA/QC on all deliverables Task 2: Environmental Analysis During the study phase, Halff will perform environmental services associated with delivery of the 100 Acre- Foot Interlocal Detention Pond project, including: a) Phase I ESA o As requested by the City of LaPorte, the Halff Environmental Team will conduct a Phase I Environmental Site Assessment (ESA) for each of the proposed pond locations. Phase I ESAs are relatively modest investigations of the conditions that exist at a given site at the time the observations are made. Typically, only visual observations of the condition of the site are made principally to determine if investigations that are more detailed are justified.