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K KJELDSEN Stephen K.Sinnock,P.E. <br /> S S I N N D C K Christopher Neudeck,P.E. <br /> N NEUDECK Neal T.Colwell,P.E. <br /> Barry O'Regan,P.E. <br /> inc. CIVIL ENGINEERS&LAND SURVEYORS <br /> 2414-0010 <br /> 08-300 <br /> May 18, 2020 <br /> Michael Callahan <br /> Senior Civil Engineer <br /> San Joaquin County <br /> Department of Public Works <br /> 1810 East Hazelton Avenue <br /> Stockton,CA 95205 <br /> Re: Grindstone Joe's Wastewater Holding Tank—Floodway Determination&Impacts <br /> Dear Mr. Callahan, <br /> This letter is in response to your 4/27/2020 email regarding the floodway determination for the Grindstone Joe <br /> Association site. This email requested additional information related to floodway definition No.4 as stated in the <br /> San Joaquin County Code Title 9 Section 9-110.4,which states: <br /> Floodway. "Floodway"means: <br /> (4) the river or other watercourse itself, between its levees or banks, to the elevation of the one-hundred <br /> (100)year flood, if the Flood Insurance Maps do not indicate the floodway and the State Reclamation <br /> Board has not established a designated floodway; or <br /> There was a typo in the previously submitted letter,and based upon the evaluation,the project site does meet this <br /> definition.However, it should be noted that his evaluation showed a reduction in cross-sectional area and fill <br /> volume in the floodway.Although this reduction in volume would likely result in insignificant reduction in flood <br /> stages or flood surcharges, a reduction in flow impedance can be expected in the 100-year flood event. <br /> The reduction in flow impedance is due to the fact that all proposed improvements to the site will be below grade. <br /> Previously used above ground holding tanks have been removed, and the proposed wastewater holding tank is <br /> entirely subgrade,and therefore not physically within the floodway. To ensure it is properly anchored and <br /> compliant with County code,concrete deadman anchors are included in the design,and fill will be placed above <br /> the tank(see previously provided Project plan set). All buoyancy calculations are based on a completely empty <br /> tank,resulting in conservative calculations for the required ballasting. <br /> We appreciate the SJC PWD's consideration of this information and we will be assisting the Association in <br /> making application to the SJC EHD for construction of the new holding tank system. If you have any questions, <br /> please contact me at jthomas cr,ksninc.com or(916)403-5900. <br /> Sincerely, <br /> KJELDSEN, SINNOCK&NEUDECK,INC. <br /> Joseph E. Thomas,RCE 90850 <br /> CC(via e-mail): Jeffery Wong,Senior Registered Environmental Health Specialist,San Joaquin County <br /> Elisabeth Beckensten,Kjeldsen,Sinnock&Neudeck,Inc. <br /> Grindstone Joe's Association <br /> Corporate Office: 711 N Pershing Avenue I Stockton,CA 95203 1 209-946-0268 1 www.ksninc.com <br /> Nlest Sacramento: 1550 Harbor Boulevard.Suite 212 1 West Sacramento.CA 95691 916-403-5900 <br />