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38 WISCONSIN ADMINISTRATIVE CODE Ind a Table 8.19-7 Minimum Tank Spacing (Shell-to-Shell) Fixed Roof Tanks Floating Roof Tanks Class I or II Liquids Class ILIA Liquids • An tanks not 1/6 sum of adjacent 1/6 sum of adjacent 1/6 sum of adjacent over ISO feet tank diameters,but tank diameters,but tank diameters,but diameter not less than 3 feet not less than 3 feet not less than 3 feet Tanks larger than 150 feet diameter If remote 1/6 sum of adjacent 1/4 sum of adjacent 1/6 sum of adjacent . . impounding is tank diameters tank diameters tank diameters in accordance with sub. (4) - (b) If impounding is 1/4 sum of adjacent 1/3 sum of adjacent 1/4 sum of adjacent around tanks in tank diameters tank diameters tank diameters accordance with • sub. (4) (c) (f) [2-2.2.6] The minimum horizontal separation between an LP gas container and a Class I,Class II or Class IIIA liquid storage tank shall be 20 feet, except in the case of Class I, Class II or Class IIIA liquid tanks operating at pressures exceeding 2.5 psig or equipped with emergency venting which will permit pressures to exceed 2.5 psig in which case the provisions of pars. (a) and (b) shall apply. Suitable means shall be taken to prevent the accumulation of Class I, Class II or Class IIIA liquids under adjacent LP gas containers such as by dikes, diversion curbs or grading. When flammable or combustible liquid storage tanks are within a diked area,the LP gas containers shall be outside the diked area and at least 10 feet away from the center line of the wall of the diked area.The foregoing provisions shall not apply when LP gas containers of 125 gallons or less capacity are installed adjacent to fuel oil supply tanks of 660 gallons or less capacity. No horizontal separation is required between aboveground LP gas containers and underground flammable and combustible liquid tanks installed in accordance with s. Ind 8.21. (4) [2-2.3] CONTROL OF SPILLAGE FROM ABOVEGROUND TANKS. (a) [2- 2.3.1] Facilities shall be provided so that any accidental discharge of any Class I,II or IIIA liquids will be prevented from endangering important facilities,adjoining property, or reaching waterways, as provided for in par. (b) or (c).Tanks storing Class IIIB liquids do not require special drainage or diking provisions for fire protection purposes. (b) [2-2.3.2] Remote impounding. Where protection of adjoining property or waterways is by means of drainage to a remote impounding area, so that impounded liquid will not be held against tanks, such systems shall comply with the following: 1. A slope of not less than 1 pert ant away from the tank shall be provided for at least 50 feet toward the impoundi.tg area; 2.The impounding -;r( shall hay .:capacity n- t less thin that of the largest , :ik that can drain iuttt it; Regi'i r 1 H.