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© 2004-2016 DKF Solutions Group All rights reserved. <br /> <br />City of Redwood City: Overflow Emergency Response Plan B-3b <br />Page 2 Sanitary Sewer Overflow/Backup Response Packet <br />Volume Estimation: Area Volume Estimation Method <br /> <br />STEP 4: Calculate the volume of the spill that was NOT absorbed into the ground. If the entire spill was <br />absorbed, skip to Step 5. <br />a. If spill is of varying depths, take several measurements at different depths and find the <br />average. <br /> inches ÷ = inches ÷ 12 = feet <br /> sum of measurements # of measurements average depth in inches average depth in feet of ponded sewage <br />b. Calculate spill volume of ponded sewage in cubic feet by multiplying the Total Spill Area in <br />Step 3 by the average depth calculated in Step 4a. Convert from cubic feet to gallons by <br />multiplying by 7.48. <br /> ft2 x ft = ft3 x 7.48 gal = gallons <br /> spill area (Step 3) average depth (Step 4a) spill volume in estimated volume of <br /> cubic feet ponded sewage <br />STEP 5: Calculate the volume of the spill that was absorbed into the ground. If only a wet stain is observed, <br />use the guidelines on B-4b Page 3 for the average depth. When estimating the volume that was <br />absorbed, take into consideration: <br />• How long the sewage has been sitting <br />• The air temperature on the day of the SSO <br />• Soil type for the area (e.g., hard-packed clay vs. loose or gravely soil) <br />When estimating the volume of the spill that was absorbed into the ground, it is also advisable to <br />dig down far enough to reach dry soil and take the depth of the wet soil into consideration. <br /> <br />Estimated volume that was absorbed into the soil: gallons <br />Explain how this estimation was determined: <br /> <br /> <br /> <br />STEP 6: Add the volume not absorbed (Step 4) plus the volume absorbed (Step 5) to get the total estimated <br />volume: <br /> gallons + gallons = gallons <br /> volume not absorbed volume absorbed Total Estimated Spill Volume <br /> <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 /> <br />This worksheet completed by: <br />Name: Signature: <br />6.2.A. - Page 139