A recipient may be assigned to participate in such work experience program only if:

(i) appropriate Federal and State standards of health, safety and other work conditions are maintained;

(ii) the number of hours an individual assigned to work experience activities authorized pursuant to this section may be required to participate in such assignment shall not exceed a number which equals the amount of assistance payable with respect to such individual's household (inclusive of the value of food stamps received by such household, if any) divided by the higher of:

(a) the Federal minimum wage; or

(b) the State minimum wage;

(iv) the project to which the participant is assigned serves a useful public purpose in fields such as health, social services, environmental protection, education, urban and rural development and redevelopment, welfare, recreation, operation of public facilities, public safety and child day care;

(v) such assignment would not result in:

(a) the displacement of any currently employed worker or loss of position (including partial displacement such as reduction in the hours of non-overtime work, wages or employment benefits) or result in the impairment of existing contracts for services or collective bargaining agreements;

(b) the assignment of a participant or the filling of a position when any other person is on layoff from the same or any equivalent position or the employer has terminated the employment of any regular employee or otherwise reduced its workforce with the effect of filling the vacancy so created with a participant assigned pursuant to this section;

(c) any infringement of the promotional opportunities of any currently employed person;

(d) the performance, by such participant, of a substantial portion of the work ordinarily and actually performed by regular employees;

(e) the loss of a bargaining unit position as a result of work experience participants performing, in part or in whole, the work normally performed by the employee in such position; or

(f) such assignment is not at any work site at which the regular employees are on a legal strike against the employer or are being subjected to lock out by the employer.