5705.1 Except as provided in § 5705.3, to prevent spilling associated with the transfer of regulated substances to an UST system, each owner or operator must use spill prevention equipment (such as a spill catchment basin) that will prevent release of regulated substances when the transfer hose is detached from the fill pipe.

5705.2 The spill prevention equipment shall have a minimum capacity of five (5) gallons.

5705.3 Except as provided in § 5705.5, to prevent overfilling associated with the transfer of regulated substances, each owner or operator shall use overfill prevention equipment that does the following:

1. (a) Automatically shuts off flow into the tank when the tank is no more than ninety-five percent (95%) full;
2. (b) Alerts the transfer operator when the tank is no more than ninety percent (90%) full by restricting the flow into the tank or triggering a high-level alarm;
3. (c) For tanks with a capacity of four thousand (4,000) gallons or more, equipment which will restrict flow thirty (30) minutes prior to overfilling, or automatically shut-off flow into the tank so that none of the fittings located on the top of the tank are exposed to product due to overfilling.

5705.4 Tanks that are susceptible to over-pressurization, shall only use an automatic shutoff valve to comply with § 5705.3.

5705.5 An owner or operator shall not be required to provide and use the spill and overfill prevention equipment specified in this section if:

1. (a) Alternative equipment is used that is determined by the Director to be no less protective of human health and the environment than the equipment specified in the other provisions of this section; or
2. (b) The UST system is filled by transfers of no more than twenty-five (25) gallons at one time.

SOURCE: Final Rulemaking published at 40 DCR 7835, 7858 (November 12, 1993); as amended by Final Rulemaking published at 46 DCR 7699 (October 1, 1999); as amended by Erratum Notice published at 53 DCR 3759 (May 5, 2006).