An affidavit signed by the subdivider agreeing to
complete surfacing of the roadway within two years after the base
course has been installed or at least 2/3 of the phase is completed.
Said subdivider shall bear the expense of any paving cost overruns
if the certified check on deposit with the town, with accrued interest,
should be an insufficient amount. In addition, should any amount of
moneys remain after surfacing is satisfactorily completed, said moneys,
plus accrued interest, shall be refunded to the subdivider.