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City of Everett 12020 Water,Filtration,Sewer,and Stormwater Rate Study 1 <br /> 1.Project Approach <br /> ✓ Establishing Data(Billing) Units—As noted above, the City will review new aerial photos <br /> and develop an updated database of parcel information. The development of impervious <br /> surface-based stormwater charges cannot be developed until the parcel data has been <br /> scrubbed and resolved to the satisfaction of the City and HDR. In part, the data must be <br /> sorted to accommodate the residential and non-residential stormwater rate structures. For <br /> residential, the City is anticipating the continued use of a flat rate, with possibly a small/large <br /> category. For non-residential, each parcel must be assessed and the impervious surface <br /> area determined. From that, an impervious surface unit(ISU)must be established. Once <br /> the ISU is defined, then the number of commercial ISU billing units can be established. <br /> / Design of Stormwater Rate Alternatives—With the billing information above, HDR can <br /> design the stormwater rates for residential and non-residential. The residential rates to be <br /> designed will be similar to the City's current stormwater rate (i.e., a flat rate). HDR will <br /> develop a uniform residential flat rate and a two-part large/small parcel flat rate. For the <br /> non-commercial rates, the 2018 impervious surface rate analysis reviewed two options; a <br /> $/square foot of impervious area and an approach based upon the relationship of lot size <br /> and impervious area(% range). The two methods produced similar results and a specific <br /> option was not selected as the preferred option. If the City still does not have a preferred <br /> non-residential stormwater rate structure then HDR will develop both rate structures for the <br /> City's review and consideration. Bill comparisons similar to those developed as a part of the <br /> 2018 stormwater rate structure study will be developed as a part of this analysis. <br /> ✓ Rate Transition—HDR and the City recognize the challenges and customer bill impacts of <br /> moving from the current non-residential stormwater rate structures to an impervious <br /> approach. Given that, this study will review the possible methods of rate transition to <br /> gradually move non-residential to full, cost-based, impervious stormwater rates. HDR will <br /> collaborate with City staff on the overall billing/rate setting approach. However, the City will <br /> be responsible for the ultimate billing approach that works within the City's billing system. <br /> Working with the City, HDR will develop a rate transition plan for the new non-residential <br /> stormwater rates. During the previous study(2016)the City reviewed the issue of <br /> stormwater credits. As part of this task, HDR will review the prior information provided to the <br /> City on the approach for stormwater credits. <br /> Task 5 Assumptions: <br /> • Development of up to two water and sewer rate alternatives for each rate schedule. <br /> • Develop water and sewer bill comparisons for the City to review customer bill impacts. <br /> • Develop an excel model to review and sort the stormwater parcel data (City is <br /> responsible for reviewing and assembling data). <br /> • Develop alternative stormwater rate designs; residential and non-residential and bill <br /> comparisons. <br /> Task 5 Deliverables: <br /> • An electronic copy of the rate model with the updated rate design analysis for each <br /> utility. <br /> Page 8 <br />