NR 345.04(2)(d)2.2. The dredging may occur only to cross a navigable stream no more than 35 feet across. NR 345.04(2)(d)3.3. The general permit may authorize up to 10 waterway crossings that are part of a single project. NR 345.04(2)(d)4.4. The size of the open trench or plowed channel may not exceed 48 inches in width in perennial streams and 72 inches in intermittent streams where no flow is present during construction. NR 345.04(2)(d)5.5. The dredging shall conform to the dimensions and elevations shown on the application. NR 345.04(2)(d)6.6. All equipment used for the project shall be designed and properly sized to minimize to the extent practicable, the amount of sediment that is resuspended into the water. NR 345.04(2)(d)7.7. Any area within 75 feet of the ordinary high water mark, where topsoil is exposed during construction, shall be stabilized within 24 hours to prevent soil from being eroded and washed into the waterway. NR 345.04(2)(d)8.8. During construction and installation of the utility crossing, the entire volume of the stream flow shall be maintained downstream from the project site. NR 345.04(2)(d)9.9. During excavation of the trench, dredged material may be temporarily stockpiled in an upland area provided it is separated from the stream by an installed silt fence or a protective, vegetated buffer strip not less than 20 feet in width. NR 345.04(2)(d)10.10. The trench excavation, filling and installation of utility crossing the below the ordinary high mark shall be completed within an 8-hour period. NR 345.04(2)(d)11.11. In perennial streams, clean, washed gravel or crushed stone or clean river stone originally removed from the utility trench or plowed channel, shall be used as backfill material to replace the excavated material. In intermittent streams with no flow present, the originally removed material may be used as backfill material for the dredged trench if the disturbed site is immediately stabilized. NR 345.04(2)(d)12.12. When the dredging is complete, the streambed contours shall be the same as the pre-construction contours. NR 345.04(2)(e)(e) Standards for maintenance dredging in established drainage districts. Dredging to maintain a district drain which is part of a drainage district established under ch. 88, Stats., is eligible for a general permit subject to the following limitations: NR 345.04(2)(e)1.1. Unless the department previously authorized the project under s. 30.20, Stats., the dredging may not be located in an area of special natural resource interest. NR 345.04(2)(e)2.2. Unless the department previously authorized the project under s. 30.20, Stats., the dredging may not be located where there are public rights features as described in s. NR 1.06. NR 345.04(2)(e)4.4. Maintenance of the district ditch and any structures in the ditch shall comply with the established specifications and compliance plan under ss. ATCP 48.20 and 48.22. NR 345.04(2)(e)5.5. Dredging may not exceed the volume or extend beyond the dimensions of the previously dredged project. NR 345.04(2)(f)1.1. A general permit, subject to all of the following limitations may authorize manual dredging activities that do not meet the exemption standards in s. NR 345.04 (1) (d). NR 345.04(2)(f)3.3. For each riparian property, the amount of bottom material removed from a waterbody may not exceed 10 cubic yards in a calendar year. NR 345.04 NoteNote: When the state is the riparian property owner, the requirements of ch. NR 45 shall be met. NR 345.04(2)(g)(g) Standards for maintenance dredging of previously dredged areas. Maintenance dredging of material from an area from which material has previously been removed is eligible for a general permit subject to all of the following limitations: NR 345.04(2)(g)1.1. Unless the department previously authorized the project under s. 30.20, Stats., the dredging may not be located in an area of special natural resource interest, or where there are public rights features as described in s. NR 1.06. NR 345.04(2)(g)3.3. Dredging may not exceed the volume or extend beyond the dimensions of the previous dredge project. NR 345.04(2)(g)4.4. The applicant has provided information that the area meets the requirements of “previously dredged area” as follows: NR 345.04(2)(g)4.a.a. The applicant can demonstrate that previous removal of material was authorized by the department; or NR 345.04(2)(g)4.b.b. The applicant can demonstrate historical information documenting the previous removal of material including the date of removal, the volume of material removed and location of the material disposal.