Agenda - Public Works Committee - 07/18/2023

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collected numerous survey shots on the subject property. Attached is a layout showing the survey shots on the front and side yards of the property. Another layout is attached showing the property with 2022 aerial photography and 1-foot contours included for reference. Based on the survey shots taken, much of the front yard must be filled and/or re -graded to prevent standing water in the front yard to properly address the property owner's concerns. Areas of one or both driveways may also need to be raised slightly. However, there is very little elevation difference between the home's foundation and the ditch along Argon Street so the final grade of the front yard would be nearly flat. And while a driveway culvert can be added under the west driveway and the ditch along Argon Street can be re -graded to better convey runoff from the street under the west driveway to the ditch along Cobalt Street, the Argon Street ditch grade will be extremely flat. Grading well defined roadside ditches and adding a driveway culvert under the west driveway will work to convey stormwater runoff from the City's right-of-way along Argon Street and Cobalt Street to the wetland north of the subject property. However, this will not fully address the property owner's concerns as a portion of the runoff that pools in the front yard is the result of rain that falls or snow that melts within the front yard, the driveways, and a portion of the property to the east. As directed by the Public Works Committee on June 20th, Staff has estimated costs to re -grade and establish turf within the right-of-way along Argon and Cobalt Streets adjacent to the subject property, and to install a driveway culvert under the west driveway including repairing the impacted portion of the concrete driveway. Attached is a copy of the plan showing the proposed ditch grading and culvert installation work, as well as a cost estimate totaling $32,071.50. It is important to note that these costs do not include costs to remove and replace any trees, which may be impacted by construction in order to achieve minimum 1:4 side slope in ditches. Notification: The property owners will receive a link to this case, and will be invited to attend the Public Works Committee meeting on Tuesday evening. Time Frame/Observations/Alternatives: Staff anticipates 15 minutes will be required to present this case and respond to questions. Funding Source: Dependent on discussions and direction from the Public Works Committee. Recommendation: Staff has no recommendations to offer at this time. Outcome/Action: Dependent on discussions and direction from the Public Works Committee. Attachments Pictures Septic As -built Plan 1972 Certificate of Survey 2022 Aerials with 2ft Contours 2022 Aerials with lft Contours Survey Shots Proposed Improvements Plan Cost Estimate