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K Grindstone Joe Association <br /> SN Flood Determination&Impacts <br /> LSan Joaquin County <br /> April 7,2020 <br /> Page 3 of 3 <br /> characteristics to determine their likely impact upon the area hydraulics(e.g. flood elevation).These numbers are <br /> presented below. <br /> Cross Sectional Area Volumetric Analysis' <br /> Analysis <br /> Existing tanks removal - 8.8 yd (30.75 ft) - 10.7 yd' <br /> Proposed tank installation + 1.1 yd (1 Oft) + 8.0 yd' <br /> Total Cross Section Area 235.9 yd N/A <br /> between levees <br /> Total Volume of cells N/A 555.6 yd (15,000 ft) <br /> needed to model area <br /> Net Change -7.6 yd -2.7 yd' <br /> Percent change -3.2% -0.5% <br /> 'Approximate project location(demolition+installation)is 100 feet by 50 feet resulting in 8 twenty-five <br /> foot grid cells in the worst case modeling scenario.The worst case was assumed where the minimum <br /> number of cells was used to cover the area of the project impacts,thus minimizing the total flood <br /> volume being included. <br /> Based upon the above negative net and percent change,reduction in flow impedance is shown. KSN would expect <br /> an insignificant reduction in flood stages or flood surcharges should this project be permitted. <br /> We appreciate the SJC EHD's and PWD's consideration of this information and we will be assisting the <br /> Association in making application to the SJC EHD for construction of the new holding tank system. If you have <br /> any questions,please contact me at jthomas?_ksninc.com or(916)403- 5900. <br /> Sincerely, <br /> KJELDSEN, SINNOCK&NEUDECK,INC. <br /> Joseph E. Thomas,RCE 90850 <br /> Enclosure <br /> SJC EHD March 30,2020 Email Correspondence <br /> FEMA FIRMette <br /> CC(via e-mail): Mike Callahan,San Joaquin County Public Works Department <br /> Elisabeth Beckensten,Kjeldsen,Sinnock&Neudeck,Inc. <br /> Grindstone Joe's Association <br />