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August 10, 2022 Mr. Lorenzo Wingate City Engineer 2963 N. 23rd Street LaPorte, TX 77571 RE: Engineering Services Fee Proposal Brookglen Subdivision Drainage Improvements Dear Mr. Wingate: Halff Associates Inc. (Halff) is pleased to submit our proposal to provide Preliminary Engineering services to increase drainage capacity within the Brookglen Subdivision in the City of LaPorte. The scope of work is also expected to include modelling existing and proposed hydraulic/ hydrologic conditions, redesigning the drainage and pavement, and replacing the water line and sidewalk. The project area is generally bounded by a CenterPoint transmission line corridor to the north, Willow Springs Bayou (B112-00-00) to the west, Fairmont Parkway to the south, and Gladwyne Lane to the east. This proposal will include the development of a preliminary engineering report (PER), final design plans, bid and construction phase services. In the PER, Halff will analyze existing conditions and evaluate proposed alternatives to recommend the most feasible design based on various factors including estimated construction cost, available right-of- way and easements, constructability, conflicts with existing utilities, and inconvenience to residents. Halff will produce alternatives to primarily improve drainage and present them to the City of La Porte in a Preliminary Engineering Report (PER). If the City authorizes Halff to further develop the design of any one of the alternatives in the PER, Halff will proceed with to proceed with Final Design (and Bidding and Construction Phase Services if authorized) to complete the design and produce signed and sealed plans for bidding and construction. Final design services would include geotechnical analysis. Existing Conditions: The existing pavement throughout the neighborhood is comprised of concrete curb and gutter streets. An underground storm sewer conveys flow to four outfall points: an underground collection system along Brookwood Drive at the north and center of the subdivision, a secondary collection system running along Lazy Brook Lane at the southwestern boundary of the subdivision, a third collection system running along Barrybrook Lane at the southwestern boundary of the subdivision and a fourth collection system running along Somerton Drive and Fairbrook Lane at the southwestern boundary of the subdivision. All outfalls terminate at Willow Springs Bayou. Access to a section of the three outfalls on the southwestern collection system is limited; a portion of the system is located within fenced -in backyards of properties within the subdivision. Proposed Conditions: Using the hydrologic and hydraulic model, Develop one (1) improvement alternative to reduce ponding in IFN.AL FIF ASSOCIATES, IIIhN�C.. 100 41 , Y Ok) H, SUl (F'I 760 I FL... WSW 66,68-52 W'WW,H,," H-'(:011 r CilNr..FtF 11,, TX 77S01-2.701 FAX (9.S6) 756r,„53:.:3