NR 110.25(5)(c)(c) Monitoring well construction. All groundwater monitoring wells shall be constructed in accordance with ch. NR 141 and this section. NR 110.25(5)(c)1.a.a. For piezometers, inlet screens shall have a length of at least 2.5 feet but not more than 5 feet unless otherwise approved by the department. NR 110.25(5)(c)1.b.b. For water table observation wells, inlet screens shall not exceed 10 feet in length. NR 110.25(5)(c)1.c.c. For a multilevel groundwater system, the deeper the well shall be screened at a depth to be determined from the site investigation. NR 110.25(5)(c)3.3. All groundwater monitoring systems shall be sampled in accordance with department published groundwater sampling procedures as referenced in s. NR 140.16. NR 110.25(5)(c)4.4. All unsuccessful wells, boreholes or other vertical holes and wells whose use is no longer required must be properly abandoned in accordance with s. NR 141.25. NR 110.25(5)(c)5.5. Documentation of well construction, well development and abandonment shall be submitted to the department in accordance with ss. NR 141.23 and 141.25. A location map shall also be provided in accordance with s. NR 141.065. NR 110.25(5)(d)(d) Alternative methods and materials. The department may approve alternative construction methods or materials for installation of groundwater monitoring wells on a case-by-case basis. NR 110.25 HistoryHistory: Cr. Register, November, 1974, No. 227, eff. 12-1-74; r. and recr. Register, February, 1983, No. 326, eff. 3-1-83; cr. (intro.), (3m), (4) (a) 3. and (4) (g), am. (2), r. and recr. (3), (4) (f) and (5), Register, November, 1990, No. 419, eff. 12-1-90; CR 09-123: am. (5) (b) 1., 3., (c) 3. and 5. Register July 2010 No. 655, eff. 8-1-10. NR 110.255NR 110.255 Conditions required for specific types of land disposal systems. NR 110.255(1)(a)(a) Design and construction criteria for absorption pond systems. NR 110.255(1)(a)1.1. New absorption pond systems shall consist of a minimum of 3 individual absorption ponds of approximately equal size. Absorption pond systems consisting of 1 or 2 individual ponds may be approved by the department on a case-by-case basis if it is demonstrated that the system has effluent storage capabilities or other provisions to ensure the operation of the system in accordance with the load and rest cycles determined under s. NR 110.25 (4) (f). NR 110.255(1)(a)2.2. The design hydraulic application rate for an absorption pond system shall be based on field and laboratory test results for infiltration and hydraulic conductivity. The design hydraulic application rate shall be conservatively established to allow for pond resting cycles and for a long term reduction in infiltration rate due to wastewater solids clogging the soil. NR 110.255(1)(a)3.3. Multiple pond systems shall be designed and constructed to allow individual ponds to be taken out of service for resting without interrupting the discharge to the remaining ponds. NR 110.255(1)(a)4.4. Wastewater effluent shall be discharged to absorption ponds such that it is evenly distributed over the entire absorption pond bottom. Effluent storage may be required to provide effluent dosing control by fill and draw operation. NR 110.255(1)(a)5.5. The absorption pond bottom shall be as level as possible at all locations. NR 110.255(1)(a)6.6. The shape of each absorption pond and the placement of ponds at the site must take into account the information in the hydrogeologic study required by s. NR 110.09 (8) such as the groundwater flow direction, the presence of discharge or recharge zones and the variability of soils. Infiltration areas should be oriented in relation to the direction of groundwater flow in such a manner as to minimize groundwater impacts. When possible, absorption ponds shall be constructed in areas which are not groundwater recharge areas. NR 110.255(1)(a)7.7. The minimum top width of an embankment or dike shall be 12 feet if the dike is intended to provide access for maintenance vehicles on a routine basis. The minimum top width shall be 8 feet if the embankment or dike is not designed for vehicle access. Outside embankment and dike slopes may not be steeper than 3 horizontal to one vertical and shall be properly seeded with a mixture of grasses to prevent erosion. Inside embankments and dikes may not be steeper than 2 horizontal to one vertical and shall be properly graveled or riprapped to prevent erosion. Interior ramps for maintenance vehicle access are acceptable. NR 110.255(1)(a)8.8. Absorption ponds may not be constructed on backfilled material. Earthwork activities within 1 foot of the final pond surface shall be limited to times when soil conditions are dry. NR 110.255(1)(a)9.9. The bottom of the absorption pond may not be closer that 5 feet to the highest anticipated groundwater elevation. NR 110.255(1)(a)10.10. An absorption pond system shall be constructed on soils which meet with the following minimum requirements: NR 110.255(1)(a)10.a.a. Soil texture may not be coarser than loamy sand (USDA soils classification) or have less than 5% passing a number 200 sieve. NR 110.255(1)(a)10.b.b. Soil texture may not be finer than clay loam (USDA soil classification) or have liquid limits greater that 50% (unified soil classification). NR 110.255(1)(a)11.11. A minimum separation distance of 10 feet shall be maintained between the bottom of the absorption pond and bedrock.