The Board shall adopt regulations governing the amount of public assistance persons receive under the provisions of this subtitle. In making such regulations, the Board shall consider significant differences in living costs in various counties and cities and, unless otherwise precluded by law, shall establish or approve such variations in monetary public assistance standards for shelter allowance on a regional or local basis, as may be appropriate. The amount of public assistance any person receives under the provisions of this subtitle shall be determined according to Board regulations with regard to (i) the property and income of the person and any support he receives from other sources, including from persons legally responsible for his support, and (ii) the average cost of providing public assistance statewide. It shall be sufficient to provide public assistance that, when added to all other income and support of the recipient (exclusive of that not to be taken into account as hereinafter provided), provides such person with a reasonable subsistence. In determining the income of and support available to a person, the amount of income required to be exempted by federal statute, or if the federal statute makes such exemption permissive, then such portion thereof as may be determined by the Board shall not be considered in determining the amount of assistance any person may receive under this subtitle. Any amounts received by a person pursuant to a settlement agreement with, or judgment in a lawsuit brought against, a manufacturer or distributor of “Agent Orange” for damages resulting from exposure to “Agent Orange” shall be disregarded in determining the amount of public assistance such person may receive from state public assistance programs and from federal public assistance programs to the extent permitted by federal law or regulation, and such amounts shall not be subject to a lien or be available for reimbursement to the Commonwealth or any local department for public assistance, notwithstanding the provisions of § 63.2-409. Any individual or family applying for or receiving public assistance under the Temporary Assistance for Needy Families Program, medical assistance services for low-income families with children, food stamp, or energy assistance programs, to the extent permitted by federal law and regulation, may have or establish one savings or other investment account per assistance unit not to exceed $5,000. Any such account, including any interest earned thereon or appreciation in value thereof, shall be exempt from consideration in any calculation under any specified public assistance program as long as no funds are withdrawn from the account. The State Board shall promulgate regulations permitting the withdrawal of funds from the account for purposes related to self-sufficiency, disregarding the funds withdrawn for such purposes in any calculation under any specified public assistance program, and establishing penalties for amounts withdrawn for any other purposes or other misuse of these funds.