4 The total contribution claimed for the development of the 140 additional dwellings is currently $2,133,458.10. An original figure of $2,583,504.80 was reduced to the above figure when the consent was modified by the council on 7 November 2005 to take account of the existing dwellings on the site. The applicant has lodged a further application for modification of the consent and contends that the s 94 contribution should be reduced because it is unreasonable in the particular circumstances of the case (s 94B(3) of the Environmental Planning and Assessment Act 1979 ("the EPA Act")).
5 Notwithstanding that the occupancy rates specified in the development consent are based upon the size of the dwellings pursuant to the CP it has been agreed between the parties that it is appropriate, at least in the present case, to use the number of bedrooms to determine the number of additional persons.
6 For the purpose of determining occupancy rates it is agreed that a small dwelling equates to a one-bedroom unit, a medium dwelling equates to a two-bedroom unit and a large dwelling equates to a three-bedroom unit. The existing eight dwellings on the site are to be credited with an occupancy rate of 3.48 persons each as very large dwellings.
7 The CP forecasts that between 2004 and 2009, 3,018 additional dwellings will be erected in Ku-Ring-Gai comprising 520 houses and 2,497 other dwellings and that 4,998 additional persons will take up residence in the local government area. The forecast increase in population in the Wahroonga precinct is 627 persons. The total sum to be collected pursuant to the CP appears to be $47,184,618.54 with an applied rate per person in the Wahroonga precinct of $9,288.51. According to the applicant, by using the respondent's average occupancy rates the forecast population increase is in fact 6,669 persons so that on this basis the council could expect to receive approximately 33% additional funds.
8 Based upon the occupancy rates foreshadowed in the CP (using the criterion of the number of bedrooms), the net increase in population as a consequence of the development will be 246 persons, according to the respondent whereas the applicant claims the net increase will be 180 persons.
9 The applicant takes no issue with the approach that forecasts a population increase in the whole of Ku-Ring-Gai based upon the construction of 3,018 new dwellings. However, it is the applicant's position that the appropriate calculation of increase in population to be attributed to each development for the purposes of the CP can only be reasonably undertaken by calculating the proportion of the 4,998 additional residents that each development represents. It is submitted that the use of such a marginal occupancy rate (MOR) is a means of apportioning the actual population increase (4,998) between new developments so that the s 94 contribution is equally distributed. It is claimed this determines the marginal increase in population generated by each new dwelling to arrive at the forecast population increase of 4,998 persons as opposed to the actual population.