1. Site plans assist the Fire Department to determine where a potential spill can be contained. The detailed site plan shall include the following:

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1 Secondary Containment, Spill Control and Drainage Guidelines for Hazardous Materials per 2010 CFC PURPOSE The intent of this guideline is to provide the requirements for the design and construction of spill control, secondary containment and drainage systems that are necessary for the storage and use of flammable/combustible liquids and hazardous materials. When required by the City of Corona Municipal Code and/or the California Fire Code; spill control, secondary containment and drainage systems shall be approved by the City of Corona, prior to construction. These guidelines do not address all environmental protection regulations. All recommendations and requirements are made with awareness that applicable environmental regulations may impact the design and use of these systems. SCOPE These guidelines are based on requirements from the Corona Municipal Code , and the 2010 California Fire Code (CFC). The primary requirements for spill control, secondary containment and drainage systems are contained in Chapter 27 of the 2010 California Fire Code. SUBMITTAL REQUIREMENTS SPILL CONTROL/SECONDARY CONTAINMENT Spill Control is the primary system of containment which prevents the flow of liquid to adjoining areas. Secondary containment is the system of liquid-tight or recessed floors with raised or recessed sills or dikes, or sumps and collection systems, or drainage systems leading to an approved location, for hazardous materials liquids or solids. When spill control or secondary containment is required, floors of buildings or areas shall meet the following requirements: Detailed Plans 1. Site plans assist the Fire Department to determine where a potential spill can be contained. The detailed site plan shall include the following: A. Scale of plan B. Site orientation (north, south, etc.) C. Loading areas D. Parking lots E. Internal roads and/or emergency access roadways F. Locations of any on-site fire hydrants and/or fire protection equipment G. Storm and sewer drains and where they terminate on the site H. Adjacent property use I. Locations and names of adjacent streets and alleys, and any fire hydrants located thereon J. Access and egress points, including widths and gates Page 1 of 5 revised January 13, 2011

2 2. The detailed facility layout shall include: A. Location of each hazardous material handling area and the quantity, vessel size and type of materials handled in each area B. Type of storage, including above ground, below ground and partially buried (such as storage tanks, barrels, process tanks, drums, pallets, cylinders, pipelines, rail cars, truck trailers, etc.) C. Location of emergency response equipment, such as equipment for fire suppression, approach and mitigation, protective clothing, medical response, etc. Spill Control Spill control is required when individual vessels have a capacity of more than 55 gallons, or when the aggregate capacity of multiple vessels exceeds 1000 gallons, per CFC The purpose of spill control is to permit the business owner to absorb a spill that may occur in day-today routine activity, and prevent the spill from flowing to an adjoining area. 2. Spill control shall be liquid-tight sloped or recessed floors in indoor locations or similar areas in outdoor locations, 3. Spill control shall be liquid-tight floors in indoor locations or similar areas in outdoor locations provided with liquid-tight raised or recessed sills or dikes, or 4. Spill control may discharge to a sump or collection system. 5. Spill control may be another approved engineered system. 6. Except for surfacing, the floors, sills, dikes, sumps and collection systems shall be constructed of noncombustible material, and a liquid-tight seal shall be compatible with the material stored. When liquid-tight sills or dikes are provided, they are not required at perimeter openings, which are provided with an open grate trench across the opening that connects to an approved collection system. Secondary Containment Secondary containment is required by CFC Table for buildings, rooms or areas used for storage of hazardous materials when the capacity of an individual vessel or the total capacity of multiple vessels exceeds the following: Liquids: Individual vessels greater than 55 gallons or multiple vessels greater than 1000 gallons Solids: Individual vessels greater than 550 pounds or multiple vessels greater than 10,000 pounds 1. Secondary containment is principally for the failure of a vessel. Secondary containment areas shall meet the design requirements for spill control, and the following specifications: 2. Secondary containment for indoor storage areas shall be designed to contain the spill from the largest vessel plus the design flow volume of fire protection water calculated to discharge from the fire extinguishing system over the minimum required system design area of the room or area in which the storage and/or use is located, for a period of 20 minutes, per CFC Secondary containment for outdoor storage areas shall be designed to contain a spill from the largest individual vessel. If the area is open to rainfall, secondary containment shall be designed to include the volume of a 24-hour rainfall as determined by a 25 year storm and provisions shall be made to drain the accumulations of groundwater and rainwater, per CFC Page 2 of 5 revised January 13, 2011

3 4. Outdoor secondary containment areas shall be approved by the Planning Department. 5. A monitoring method shall be provided to detect hazardous materials in the secondary containment system. The monitoring method is allowed to be visual inspection of the primary or secondary containment, or other approved means. Where secondary containment is subject to the intrusion of water, a monitoring method for detecting water shall be provided. When monitoring devices are provided, they shall be connected to distinct visual or audible signals, per CFC Drainage systems shall be designed in accordance with the California Plumbing Code and the requirements of the City of Corona Water Utilities Department. Drainage 1. Drainage is the method of fluid transfer commonly used in conjunction with spill control and secondary containment to direct the flow of the hazard to a more suitable location. As noted above, pumps and piping systems are also permitted as a transfer method, when secondary containment in the rooms or buildings protected is not adequate. When necessary, rooms or areas shall be provided with a transfer system to direct the flow of liquids into an approved location or treatment system. Drainage systems may be directed to treatment or neutralizer systems, when approved by the City of Corona. 2. The slope of floors to drains in indoor locations or similar areas in outdoor locations shall not be less than 1%. 3. Drains shall be sized to carry the sprinkler system design flow rate over the minimum required system design area or are of the room or area in which the storage in located, whichever is smaller, 4. Drains from outdoor storage areas shall be sized to carry the volume of fire flow and the volume of a 24- hour rainfall as determined by a 25-year storm, 5. Materials of construction for the drainage system shall be compatible with the materials stored, 6. Incompatible materials shall be separated from each other in the drainage system, and 7. Drains shall terminate in an approved location away from buildings, valves, means of egress, fire access roadways, adjoining property and storm drains. SECONDARY CONTAINMENT CALCULATIONS FOR OUTSIDE STORAGE 1. Determine the volume of secondary containment: L W H = Volume Multiply the length X width X height 2. Determine the displacement factor of the primary containers: (π r², for drum storage). a. Square the radius of a single drum b. Multiply this by 3.14 (π). c. Multiply the result by the number of drums within the secondary containment area d. Multiply this result by the proposed height of the containment area 3. Subtract the displacement factor from the total volume to determine the actual volume available for containment. Page 3 of 5 revised January 13, 2011

4 4. Determine the volume of the largest container. This factor may have to be converted to the unit of measurement used in the steps above. For instance, for a 55 gallon drum, you may have to use the Standard Conversions form to convert the gallons to cubic feet (7.481gallons = 1 c.f.) or cubic inches (1 gallon = 231 cubic inches). 5. Determine the volume of a 24 hour rainfall based on a 25 year storm history. The amount of rainfall for a given area can be requested from the Western Regional Climate Center (702) To determine the maximum amount of rainfall a secondary containment area the following calculations should be performed: Length x width x # of inches (feet) of rainfall 6. Add the volume of the largest container (in cubic feet or cubic inches) to the volume of the rainfall. Largest container + rainfall = total amount of liquid to be contained 7. Determine if the volume of the secondary containment area is large enough to hold the volume of the largest container and 24 hour rainfall. (Total Area displacement) (largest container + rainfall) 8. If the number derived from the above calculation is smaller than the volume of the secondary containment derived in Step 1, the secondary containment area is too small. SECONDARY CONTAINMENT CALCULATIONS FOR INSIDE STORAGE 1. Determine the volume of the largest vessel either in use or storage: ie, 325 gallon tote, 55 gallon drum, 500 gallon tank, etc. 2. Determine the design flow volume of the fire protection water calculated to discharge from the fire extinguishing system over the minimum required design area or area of the room in which the storage is located, whichever is smaller, for a period of 20 minutes. Example: multiple 55 gallon drums of product in a 2500 s.f. H-2 room, room measures 50 by 50 a. Largest vessel = 55 gallons b. Fire Sprinkler design density is Extra Hazard Group 2, with density of.40 gpm per 2500 s.f. c. Calculate the volume of water per design area or area of room (select smaller): 1. gpm x s.f..40 gpm x 2500 s.f. = 1000 gallons per minute per square foot (gpm/sf) d. Calculate the total volume of fire sprinkler flow to be contained over 20 minutes: 1. gpm/sf x 20 minutes 1000 gpm/sf x 20 minutes = 20,000 gallons e. Add the volume of the largest vessel to be contained: 1. 20,000 gallons + 55 gallons = 20,055 gallons 2. Convert the # of gallons to cubic feet gallons = 1 cubic foot 20,055 gallons gallons = 2680 cubic feet Page 4 of 5 revised January 13, 2011

5 f. Calculate the capacity (volume) of the secondary containment: 1. Length x Width x Height (L ) 50 x (W ) 50 x (H ) 1.25 (15 curb for diked area) = 3125 cubic feet g gallons of volume for secondary containment > 2680 gallons volume of product + fire flow Therefore, the secondary containment is adequate; it exceeds the volume of product + fire flow water. FORMULAS, etc. Where: A = Area D = Diameter R= R = Radius C = Circumference C = V = Volume π = (pi) D= Circle A = x R x R R = D/2 =R C = x D D = 2 x R Cylinder =H V = x R x R x H =L Rectangle A = W x L V = W x L x H Volume Conversions: (per US Office of Weights and Measures) 1 cubic foot of liquid = gallons 1 gallon =.133 cubic feet 1 gallon = 231 cubic inches H= L =W Page 5 of 5 revised January 13, 2011