Septic tanks may be installed upon any lot not closer than three hundred feet to any public sanitary sewer; provided, that septic tanks may not be installed upon lots that are too small to provide sufficient area to accommodate the number of branches and the number of linear feet of drainage tile required in the plans and specifications on file in the office of the plumbing inspector and the building inspector. Septic tanks may not be installed upon lots that are frequently inundated, or upon which surface water frequently stands, or upon lots where adequate seepage from the drainage tiles cannot be obtained because of soil water or soil structure. (Prior code § 4-1-53)