Section 6.13. Utilities: Pipes. All utilities shall be installed below the surface of the ground. No water pipe, gas pipe, sewer pipe, or drainage pipe shall be installed or maintained on any Lot above the surface of the ground, except hoses used for irrigation purposes and sprinkler back-flow prevention. No Lot shall be used for the purpose of boring, mining, quarrying, exploring for or removing oil or other hydrocarbons, minerals, gravel or earth.