NR 120.14(13)(b)2.c. c. Failure of the structure would have minimum potential to endanger life or real or personal property.

NR 120.14(13)(b)3. 3. Cost-sharing may not be authorized for any grade stabilization structure on a navigable stream or stream classified as supporting a fishery.

NR 120.14(13)(c) (c) Standards. Standards from the NRCS field office technical guide are as follows:

NR 120.14(13)(c)1. 1. 410 — grade stabilization structure; July, 1994.

NR 120.14(13)(c)2. 2. 350 — sediment basin; September, 1990.

NR 120.14(13)(c)3. 3. 638 — water and sediment control basin; September, 1989.

NR 120.14(13)(c)4. 4. 342 — critical area planting; November, 1999.

NR 120.14(13)(c)5. 5. 348 — diversion dam; March, 1987.

NR 120.14(13)(c)6. 6. 362 — diversion; September, 1989.

NR 120.14(13)(c)7. 7. 382 — fence; November, 1999.

NR 120.14(13)(c)8. 8. 412 — grassed waterway; June, 1993.

NR 120.14(13)(c)9. 9. 468 — lined waterway or outlet; June, 1993.

NR 120.14(13)(c)10. 10. 484 — mulching; July, 1987.

NR 120.14(13)(c)11. 11. 500 — obstruction removal; January, 1983.

NR 120.14(13)(c)12. 12. 620 — underground outlet; June, 1993.

NR 120.14(13)(c)13. 13. 606 — subsurface drain; September, 1989.

NR 120.14(13)(c)14. 14. 638 — water and sediment control basin; September, 1989.

NR 120.14(14) (14) Agricultural sediment basins.

NR 120.14(14)(a) (a) Description. Agricultural sediment basins are permanent basins designed and constructed to reduce the transport of pollutants to surface waters and wetlands of sediment eroded from critical agricultural fields. This practice shall be implemented using one or more of the standards in par. (c).

NR 120.14(14)(b) (b) Conditions.

NR 120.14(14)(b)1. 1. Cost-sharing may be provided for the sediment basin including embankments, principal and emergency spillway structures, including anti-seep collars, dewatering outlet and outlet protection.

NR 120.14(14)(b)2. 2. Cost-sharing may not be provided for:

NR 120.14(14)(b)2.a. a. Basins having embankments exceeding 25 feet in structural height or with maximum storage capacity of more than 50 acre-feet.

NR 120.14(14)(b)2.b. b. Basins located where failure may result in loss of life.

NR 120.14(14)(b)3. 3. Sediment basins with embankments of 15 to 25 feet in structural height or with maximum storage capacities of 15 to 50 acre-feet in volume may be cost-shared only when approved by the department, in writing, prior to construction. For the department to authorize cost-sharing, it shall make the following findings:

NR 120.14(14)(b)3.a. a. Control of the site is needed to achieve the water quality objectives specified in the approved priority watershed plan, priority lake plan or project grant application.

NR 120.14(14)(b)3.b. b. Construction of the structure is cost-effective.

NR 120.14(14)(b)3.c. c. Failure of the structure would have minimum potential to endanger life or real or personal property.

NR 120.14(14)(c) (c) Standards. The sediment basin shall be designed consistent with standards for construction site sediment basins in the Wisconsin Construction Site Best Management Practice Handbook, WDNR Pub. WR-222, November 2001 Revision, the Wisconsin department of natural resources conservation practice standard 1001 for wet detention basins, June 1999 and the NRCS field office technical standards from the NRCS field office technical guide as follows: