(a) Only the front or customer side of the dry cleaning machine should be readily accessible to the customer area. The working or maintenance portion of the machines should not be accessible to the customers in the store. In the event it becomes necessary to service dry cleaners from the customer area, the concentration of perc vapors should be kept at a level of 100 PPM or less if customers are present.
As a means of minimizing any solvent vapor build-up in the customer area and in the utility room resulting from any minor solvent leakage, it is required that there be a minimum flow rate of air away from the customer area as follows:
Number of Machines | Minimum Flow Rate Per Machine (cfm) |
1 - 3 | 250 |
4 - 8 | 200 |
9 - 16 | 150 |
17 or more | 100 |
(b) The exhaust ventilation as described above shall be provided on a continuous basis while the store is open for business. The fan wiring shall be such that the dry cleaning equipment cannot be operated unless the fan system is in operation.
(c) Access doors to the maintenance area shall be kept locked.
(d) The cleaning equipment must be provided with an exhaust system capable of maintaining a minimum of 100 feet per minute face velocity through the loading door whenever the door is open. The ductwork connections from this system must be sealed (soldered or taped) and the discharge stack extended above the roof line.
(e) A satisfactory means of preventing any leaking liquid from escaping the enclosure or room in which the dry cleaning equipment is installed must be provided. In order to accomplish this a method must be provided for draining or otherwise removing the solvent in the event of a leak, and for containment to hold a liquid volume equal to the maximum quantity of solvent contained in the system.
(f) An interlock system must be provided on the machine to prevent the loading door from being opened during the normal cycle. This system may be either electrical and/or mechanical and so connected that in the event of a power failure the machine fails safe.
(g) A step by step instruction list must be posted in a conspicuous location near the machine for customer use. Included should be a list of items not to be dry cleaned. A telephone number must be listed for emergency assistance.
(h) The machine design must be such that in the normal course of operation no significant amount of solvent is retained in the cleaned items upon completion of the dry cleaning cycle.
(i) The machine should be inspected daily and kept in good repair. All maintenance personnel should be familiar with necessary machine repairs and instructed as to proper methods for handling perc.
(j) Solvent control is to be such that under normal operation and use conditions prevailing solvent concentrations in the customer area will not exceed 100 PPM.
(k) Only the solvent and supplies specified by the equipment manufacturer shall be used.
(l) A supply of make-up air equal to or greater than the total volume of air exhausted from the plant should be provided in order to eliminate any negative pressure conditions which might otherwise develop.
(m) Exhaust ventilation stacks from dry-cleaning machines should not be located in proximity to combustion air intakes on gas-fired equipment.
(Ord. 62-42. Passed 4-16-62.)