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© 2004-2016 DKF Solutions Group All rights reserved. <br /> <br />City of Redwood City: Overflow Emergency Response Plan B-3a Sanitary Sewer Overflow/Backup Response Packet <br />Volume Estimation: Eyeball Estimation Method <br /> <br />Use this method only for small SSOs of less than 200 gallons. <br />SSO Date: Location: <br />STEP 1: Position yourself so that you have a vantage point where you can see the entire SSO. <br />STEP 2: Imagine one or more buckets or barrels of water tipped over. Depending on the size of the SSO , <br />select a bucket or barrel size as a frame of reference. It may be necessary to use more than one <br />bucket/barrel size. <br />STEP 3: Estimate how many of each size bucket or barrel it would take to make an equivalent spill. Enter <br />those numbers in Column A of the row in the table below that corresponds to the bucket/barrel <br />sizes you are using as a frame of reference. <br />STEP 4: Multiply the number in Column A by the multiplier in Column B. Enter the result in Column C. <br /> A B C <br />Size of bucket(s) or <br />barrel(s) <br />How many <br />of this size? Multiplier Estimated SSO <br />Volume (gallons) <br />1 gallon water jug x 1 gallons <br />5 gallon bucket x 5 gallons <br />32 gallon trash can x 32 gallons <br />55 gallon drum x 55 gallons <br />Other: ______ gallons x _____ gallons <br />Estimated Total SSO Volume: <br /> <br />STEP 5: Is rainfall a factor in the SSO? ☐ Yes ☐ No <br /> If yes, what volume of the observed spill volume do you estimate is rainfall? gallons <br /> If yes, describe how you determined the amount of rainfall in the observed spill? <br /> <br />STEP 6: Calculate the estimated SSO volume by subtracting the rainfall from the SSO volume: <br /> gallons − gallons = gallons <br /> Estimated SSO Volume Rainfall Total Estimated SSO Volume <br />Do you believe that this method has estimated the entire SSO? ☐ Yes ☐ No <br />If no, you MUST use additional methods to estimate the entire SSO. If yes, it is advisable to use additional <br />methods to support the estimation. Explain why you believe this method has/has not estimated the entire SSO: <br /> <br /> <br />This worksheet completed by: <br />Name: Signature: <br />Job Title: Date: <br />6.2.A. - Page 136