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<br />. <br /> <br />e <br /> <br />to the attention of the City any known obstacles that might be encountered in <br />constructing the sanitary sewer in any location under consideration. The <br />Professional Engineer of Record shall determine the existence of pipes, ducts, <br />obstacles and other utilities (i.e. gas, telephone, electric, fiber optic, cable, etc.) <br />from a visual survey on the ground plus research of the public records and <br />private records when available. <br />11. Sanitary sewers within the City of La Porte's jurisdiction shall be designed and <br />installed at such a size and depth as to allow for orderly expansion of the system, <br />so as to avoid duplication in the future, and shall conform with the <br />Comprehensive Wastewater Collection and Treatment Plan (1984) for the City <br />of La Porte (as amended where applicable). <br />12. Sanitary sewers shall be separated from water lines by a minimum of 10 feet of <br />horizontal clearance. See Chapter 3 Water System Design Criteria for water and <br />sanitary sewer crossing design criteria. <br />13. Sanitary sewers shall be separated from storm sewer lines by a minimum of 4 <br />feet of horizontal clearance and the storm sewer line shall be above the sanitary <br />line where possible. <br />14. For sanitary sewers crossing utilities other than water or storm sewer (i.e. cable, <br />gas, fiber optic, power, etc.), a minimum of 6 inches of horizontal clearance <br />shall be maintained as measured from outside wall to outside wall. <br /> <br />G. Line Size <br /> <br />1. The minimum pipe diameter for a public sanitary sewer main or lateral sewer <br />other than a service lead shall be 6 inches. <br />2. Service leads 6 inches in diameter shall not serve more than the equivalent of 2 <br />single family lots or other equivalent types of small land tracts. <br />3. Service leads for single family residential lots shall have a minimum grade of <br />0.10% for a 6 inch line. The average daily flow for the design of sanitary sewers <br />shall be based on a minimum of 1350 gallons per day per acre (GPD/AC) of <br />residential land, 6534 GPD/AC of commercial land and 9450 GPD/AC of <br />industrial land. <br />4. For commercial service leads such as street bores, the required size of the line <br />shall be established from the plumbing drawings. Commercial, industrial, and <br />office areas shall be designed for an average daily flow that can be anticipated <br />from the contributing area. <br />5. Commercial sewer service leads shall be 6 inch pipe or larger. A single 6 inch <br />commercial service connection shall not serve more than one commercial lot or <br />parcel. Four inch service leads for commercial developments shall not be <br />allowed. <br />6. Sewer mains and lateral sewers shall meet at a manhole. Sewer mains and <br />lateral sewers shall end in a manhole and may end in a cleanout with special <br />permission and approval from the City Engineer. <br />7. The City shall have final review and approval authority as to the size and depths <br />required for sanitary sewer mains and lateral sewers. <br /> <br />H. Line Depth <br /> <br />1. The sanitary sewer should be laid with the top of the pipe a minimum of 4 feet <br />below the surface of the natural ground or finished grade. <br />2. Sanitary sewers laid in street rights-of-way with a curb and gutter section shall <br />have a minimum cover of 4 feet from the top of the pipe to the flowline <br />elevation of the gutter in the street at all locations. The Professional Engineer of <br />Record shall account for any anticipated future sanitary sewer extension whereas <br />the future sanitary sewer extension shall have a minimum 4 feet of cover from <br />the top of the pipe to the flowline of the gutter of the street. The Professional <br /> <br />Sanitary Sewer Design Criteria Page 7 of II <br />