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<br />examples of impervious surfaces that are not included in the building foot print <br />measurement but do figure into the calculation of the total impervious surface for <br />that category. Based on sample data, and the adjustment factor referenced in section <br />5.3.2, the ESU measurement for a small residential account is set at 1.8. Medium <br />residential accounts are set at 2.9 ESDs. <br /> <br />When multiple customers share in the use of a site's impervious surface, the ESUs <br />for the site are divided amongst the customers. This may result in charges for <br />fractional ESUs added to charges for the ESUs of an individual customer's site. For <br />example, if five customers share access over and responsibility for a 8,678 square <br />foot impervious area private street, each customer is billed for one fifth the private <br />street's 8 ESUs, or 1.6 ESUs per customer, in addition to the charges for each <br />customer's individual premises. <br /> <br />The utility determines impervious area and building foot print information from <br />Assessment and Taxation records, aerial photos, building permit data, and other <br />sources as appropriate. <br /> <br />Administrative Order - Page 7 of 17 <br />