maintain certification folders on applicants and/or recipients of food stamps.

(1) applications for certification or recertification;

(2) worksheets used in the computation of income for eligibility;

(3) documentation of eligibility. Such documentation shall include the method of verification used in determining eligibility;

(4) copies of forms sent to the issuance unit to authorize or change participation and/or which serve as the basis of issuance;

(5) copies of notices sent to the household and any responses to those notices; and

(6) copies of documents reflecting actions related to the fair hearing process;