Electric and telephone lines shall be buried or provided in easements at the rear lot lines. When electric or telephone service is located in rear lot easements, additional easements shall be provided along side lot lines at intervals of 250 feet or less at such other intervals as may be established by a street lighting plan approved by the Planning Commission. Easements shall be at least sixteen feet wide except that easements used solely for access to utilities above ground or easements for overhead utilities may be ten feet wide. Light standards shall be located in the curb strip between the sidewalk and street.