The Board of Standards and Appeals shall impose the following conditions on the method of operation of such uses:

(a)        that all drilling, blasting, or excavation operations shall be limited to Mondays through Fridays between the hours of 8:00 a.m. and 5:00 p.m.;

(b)        that the emission of process dust either from the area of operations or from the excavated materials themselves shall be minimized by frequent watering or by such other means as the Board shall direct;

(c)        that the warning notices respecting unlawful entry shall be posted on the fence, and that a watchman shall be stationed on the premises to police the entire area after normal working hours and on weekends and holidays; and

(d)        that excavation operations shall be undertaken in such manner as to avoid the creation of undrained pockets and the formation of stagnant pools. When topographical conditions make such compliance impossible, all pools of water resulting from surface drainage shall be sprayed in accordance with the requirements of the Department of Health to eliminate breeding places for mosquitoes or other insects.

The Board may prescribe additional appropriate conditions and safeguards to protect the public health, safety and general welfare during the period between the cessation of operations and the final rehabilitation of the site in accordance with approved plans.