HDR Engineering Inc. 1/18/2022 Amendment 1

Exhibit A - Scope of Work Scope of Services The following tasks include the task remaining from the original scope of services,two with updated requested additional services,and one additional(new)task requested by the City. Task 1: Rate Design Analysis(Original Task) The original task was to review and analyze the current utility rate structures for water,water filtration, sewer, and stormwater based on the City's policy objectives for rate and revenue stability,customer equity,efficiency of use,and administrative practicality. For each proposed rate design,the revenues to • be generated from the fixed and volume-based components of the rate structure will be identified to help better address the issue of revenue stability. Bill comparisons will be developed to numerically and graphically show the bill impacts of the proposed rates compared to the present rates. At this time,the proposed rates for the water,water filtration,and sewer utilities have been developed. In addition,the current rate structure for the stormwater rates was maintained and rate projections developed. The remaining rate design analysis is to assist the City in the transition of the current stormwater rates to an impervious area charge. Provided below is a summary of the remaining aspects of the rate design analysis for the stormwater rate designs. Stormwater Charges—As noted above,the City is interested in transitioning to separate stormwater rates based upon impervious area. This issue and the transition to impervious charges has been studied extensively by the City since the last comprehensive rate study. Similar to the City's previous studies on this topic,this is a relatively complex task requiring a number of analytical steps jointly performed by HDR and the City. Provided below is a more detailed discussion of these steps and the role of the City and HDR in them. ✓ Review of Parcel/impervious Surface Data—The development of stormwater charges based upon the impervious surface area of a parcel requires a detailed review of non-residential parcel data. The City and HDR have jointly worked on this particular aspect of stormwater rates. The City will be contracting for updated aerial photos of parcels in May 2020 and the City hopes to have updated parcel data available in time for use in the development of the 2021 rates. The City will be responsible for the development of the new parcel data. In the past, HDR has been responsible for sorting and "scrubbing"the City's parcel data(e.g.duplicates,data errors,non-billable parcels). If the data is available and appears to be consistent and reliable compared to the existing data,then the new data will be utilized. If the new data is not available,the City will need to make a decision to either continue the existing stormwater rate approach for an additional year(s), or alternatively, use the existing parcel data until the new updated parcel data is available. ✓ Establishing Data(Billing)Units—As noted above,the City will review new aerial photos and develop an updated database of parcel information. The development of impervious surface-based stormwater charges cannot be developed until the parcel data has been scrubbed and resolved to the satisfaction of the City and HDR. In part,the data must be sorted to accommodate the residential and non-residential stormwater rate structures. For residential,the City is anticipating the continued use of a flat rate,with possibly a small/large category. For non-residential,each parcel must be assessed and the impervious surface area determined. From that,an impervious