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3. The area on which the transfer takes place shall be paved. IFthe liquid is reuctive with asphalt (for <br />example, gasoline) Portland cement concrete shall be used to pave the area. <br />4. The lr.^.sfer area shall be graded or bermed !o prevent the run-on of stormwater from adjacent areas. <br />�. Trench or valley drains shall be located at the perimeter of the transfer area alung the down-hill side. <br />6. The drains shall route any runoff or spills through a spill containment structure consisting of a vault or <br />large catch basin/manhole with 2�0 gallons of live storage capacity. The spill containment structure <br />shall discharge to the storm drainage system. <br />7. The outlet of the spill containment structure shall be equipped with an AFL/Clark Oil Stop valve, or <br />approved equal, that allows passage of water but not of the product being transferted. <br />8. The lid of the spill containment structure shall be designed to vent vapors to the atmosphere and shall be <br />constructed of non-sparking material. <br />9. Drip pans shall be placed at locations where spillage may occur such as hose connections, hose reels and <br />filler noules. Drip pans shall always be used when making and breaking connections. <br />10. An audible alarm system, triggered by a liquid level sensor, sh::ll be designed and installed to alert an <br />attendant when the tank has been filled to 95% capacity. <br />11. A spill catchment basin shall be provided which surrounds thc underground storage tank's fill pipe, <br />prevents the inflow of the stored substance into the subsurface environment, and drains minor ove�lls <br />into the underground storage tank once volume becomes available. <br />LOADING AND UNLOADING PROM OR TO htARINE VESSELS <br />Facilities and procedures for the loading or unloading of petroleum products must comply with Coast Guard <br />requirements (R.5 in Section 4-3). <br />TRANSFER OF SMALL QUANTITIES FROM'CANKS AND CONTAINERS <br />See BMPs S 1.d0 and S L50 for requirements on the transfer of small quantities from tanks and containers, <br />respectively. <br />4-2.2.5 B�IP S1.�t0 LIQUID STORAGE IN ABOVE-GROUND TANKS <br />Any business which stores liquids in above-ground tanks shall comply with the following practices. <br />Storage of reactive, ignitable, or Flammable liquids must comply with the Uniform Fire Code (R.2 in Section 4- <br />3). The following practices are to complement, r.ot conflict with the Uniform Fire Code. Below-ground tanks <br />shall comply with Ecolcay requirements (R.6 in Section 4-3). <br />PERMANENT TANK STORAGE <br />l. The tank shall include an overfill protection system to minimize the risk of spillage during filling. <br />2. Pertnanently installed tanks shall be surrounded by dikes or bertns. The dike or bertn shall be of <br />sufficient height to provide a volume that is the greater of either 10° o of the total enclosed tank volume <br />or I 10% of the volume contained in [he largest tank. <br />3. The dikes and the surface within the dike area shall be sufficiently impervious to prevent loss of the <br />stored material in the event of spillage. <br />4-2-9 <br />