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The costs of providing governmental services during and after flood conditions, including maintenance and repair of public utilities and facilities such as sewer, gas, electrical, and water system, and streets and bridges. Generally, variances may be issued for new construction and substantial improvements to be erected on a lot of one -half (1/2) acre or less in size contiguous to and surrounded by lots with existing structures constructed below the base flood level, providing Sections 7- 9- 605(c)(1) through 7- 9- 605(c)(1 have been fully considered. As the lot size increases beyond one -half (1/2) acre, the technical justification required for issuing the variance increases. Upon consideration of the factors of Section 7- 9- 605(c) and the purposes of this Chapter, the City Council may attach such conditions to the granting of variances as it deems necessary to further the purposes of this Chapter. Any applicant to whom a variance is granted shall be given written notice over the signature of a community official that the issuance of a variance to construct a structure below the base flood level will result in increased premium rates for flood insurance up to amounts as high as $25 for $100 of insurance coverage, and such construction below the base flood level increases risks to life and property. It is recommended that a copy of the notice shall be recorded by the Floodplain Administrator in the Office of the Alameda County Recorder and shall be recorded in a manner so that it appears in the chain of title of the affected parcel of land. Section 7 -9 -610 CONDITIONS FOR VARIANCES. Generally, variances may issued for new construction, substantial improvement, and other proposed new development to be erected on a lot of one -half (1/2) acre or less in size contiguous to and surrounded by lots with existing structures constructed below the base flood level, providing that the procedures of Articles 4 and 5 of this ordinance have been fully considered. As the lot size increases beyond one -half (1/2) acre, the technical justification required for issuing the variance increases. Variances may be issued for the repair or rehabilitation of "historic structures" (as defined in Article 2 of this ordinance) upon a determination that the proposed repair or rehabilitation will not preclude the structure's continued designation as an historic structure and the variance is the minimum necessary to preserve the historic character and design of the structure. Variances shall not be issued within any mapped regulatory floodway if any increase in flood levels during the base flood discharge would result. 25