Cal. Code Regs. tit. 3 § 646.1
Dirt or unpaved corrals, or unpaved lanes, shall not be located closer than 25 feet from the milking barn or closer than 50 feet from the milk house. Corral drainage must be provided. A minimum of 3 percent slope shall be maintained in unpaved corrals where the available space for each animal is 400 square feet or less. The slope in areas more than 400 square feet per animal may be reduced proportionately to not less than 1 " percent at 800 square feet or more per animal. Deviations from the corral slope requirements, permissible under the authority of Section 33482 of the Agricultural Code, shall not be made without written permission from the director. The deviation request must be supported with evidence the proposal will result in comparable drainage.
A paved (concrete or equivalent) ramp or corral shall be provided to allow the animals to enter and leave the milking barn. This paved area shall be curbed (minimum of 6 inches high and 6 inches wide) and sloped to a drain. Cow washing areas shall be paved (concrete or equivalent) and sloped to a drain. The perimeter of the area shall be constructed in a manner that will retain the wash water to a paved drained area. Paved access shall be provided to permanent feed racks, mangers, and water troughs. Water troughs shall be provided with:
The cow standing platform at permanent feed racks shall be paved with concrete or equivalent for at least 10 feet back of the stanchion line.
Cal. Code Regs. Tit. 3, § 646.1
Note: Authority cited: Sections 407 and 33481, Agricultural Code. Reference: Sections 33481 through 33486, Agricultural Code.