Specifications include, but are not limited to: a) Gravity Sanitary Sewers. When potable water pipes and gravity sanitary sewers are laid parallel to each other, the horizontal distance between them shall be not less than 10 feet regardless of elevation difference. The distance shall be measured from edge to edge. The laying of water pipes and sanitary sewers shall be in separate trenches with undisturbed earth between them. In cases where it is not practical to maintain a 10-foot separation, equivalent protection shall be required and approved by KDHE. When a water pipe and a gravity sanitary sewer cross and there is 2 feet or more of separation (clear space), no special requirements or limitations are provided herein. In cases where it is not practical to maintain a 2-foot separation, equivalent protection shall be required and approved by KDHE. Joints in the sewer pipe shall be located as far as practical from the intersected water main. b) Pressure Sanitary Sewers. When a water pipe and pressure sanitary sewer are laid parallel to each other, the same separation rules apply as for gravity pipe. When a water pipe (including service lines) and a pressure sanitary sewer cross and the pressure sewer is 2 feet or more (clear space) below the water pipe, no special requirements or limitations are provided herein. In cases where it is not practical to maintain a 2-foot separation or the sewer is above, equivalent protection shall be required and approved by KDHE.