Cal. Welf. & Inst. Code § 10424
(c)
(1) A provider organization petitioning for an election to be certified by the board as the representative for an appropriate unit of providers shall include in its petition proof of a 10-percent showing of interest designating the provider organization to act as the statewide representative of the providers. For purposes of the showing of interest, “family child care provider” shall include any “family child care provider” within the meaning of subdivision (b) of Section 10421 who received a subsidy payment in any of the last three full calendar months before the petition was submitted for which the information is available pursuant to subdivision (d) of Section 10422. Proof of support may consist of, but does not require, any one of the following:
(2)
(A) The board, or a neutral third party designated by the board to act on a request for an election, shall consider evidence of a family child care provider’s support, or lack of support, for a provider organization valid if it was signed by the family child care provider within two years of the date it is submitted to the board. For purposes of showing proof of support by a provider for a provider organization, as described in paragraph (1), the board shall accept any electronic signature that satisfies either of the following:
(d)
(e)