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jurisdiction and facilities are involved, and provides access to rainfall and other weather data from the ALERT Flood Warning Network. To contact either OCEMA section, call Orange County Control One (available 24 hours) at (714) 628-7008 and inform them of the type of assistance that is needed. Orange County Sanitation District (OCSD) OCSD should be contacted whenever a spill involves an OCSD trunk sewer facility. They may provide assistance with vactor trucks and other equipment in emergency situations after attempts to use contract services prove unsuccessful. Contact OCSD at (714) 962-2411. City of Santa Ana Storm Water Management Division The City of Santa Ana Storm Water Management Division personnel should be contacted whenever a spill reaches the storm drain system and is not fully recovered by the responding personnel. Contact Carlos Castellanos at (714) 647-5642 or his cell phone at (714) 486-4660, or Thomas Lo at (714) 647-5659. APPROVED VOLUME CALCULATION METHODS EYEBALL ESTIMATION METHOD (for spills 200 gallons or less) 1. Position yourself so that you have a vantage point where you can see the entire spill. 2. Imagine one or more buckets or barrels of water tipped over. Depending on the size of the spill, select a bucket or barrel size as a frame of reference. 3. Estimate the volume of the sewage spill by comparing it to your knowledge of the appearance of a known quantity of water. 4. If rainfall is a factor in the spill, estimate what amount of the spill is rainwater and subtract that from your initial estimation. PHOTO COMPARISON METHOD 1. Refer to the photos in Appendix C to estimate the flow rate in gpm. 2. Calculate the gallons based on the flow rate and the total length of time of the spill (GPM X Time = Total Gallons) AREA/VOLUME PONDED SEWAGE METHOD 1. Draw an outline of the spill, and then break the footprint down into recognizable shapes. Then calculate the area of each shape REVISION 4.0 (4/17) 19 F -81 16