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�{ K,J E L D S E N Stephen K.Sinnock,P.E. S S I N N D C K Christopher H.Neudeck,P.E. Neal T.Colwell,P.E. N N E U D E C K Barry O'Regan,P.E. inn. CIVIL ENGINEERS&LAND SURVEYORS 2414-0010 08-300 April 7,2020 Mr. Jeffery Wong Jwongpa,sigov.org Senior Registered Environmental Health Specialist Environmental Health Department San Joaquin County 1868 East Hazelton Avenue Stockton,CA 95205 Re: Grindstone Joe's Wastewater Holding Tank—Floodway Determination&Impacts Dear Mr. Wong, This letter,written on behalf of the Grindstone Joe Association(Association), is intended to provide additional detail as requested by the March 30,2020 email correspondence with the San Joaquin County Environmental Health Department(SJC EHD). This e-mail correspondence is provided as attachment to this letter. The following addresses the concerns identified by the SJC EHD and Public Works Department(PWD). The email correspondence indicates that the SJCPWD has determined the Wastewater Holding Tank(Project)is located within the floodway. The San Joaquin County Code Title 9 Section 9-110.4 defines a floodway as: Floodway. "Floodway"means: (1) the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the one-hundred(100)year flood without cumulatively increasing the water surface elevation more than one (I)foot; (2) the floodway shown on the Flood Insurance Maps; (3) the designated floodway of the State Reclamation Board, if the Flood Insurance Maps do not indicate the floodway; (4) the river or other watercourse itself, between its levees or banks, to the elevation of the one-hundred (100)year flood, if the Flood Insurance Maps do not indicate the floodway and the State Reclamation Board has not established a designated floodway; or (S) the channel necessary to carry a flood with a one percent(I%) or greater probability of occurring in any given year established by the Floodplain Administrator, if the above criteria do not determine the floodway. In order to determine if the Project location is a floodway as defined by definition(2), KSN reviewed the effective FEMA FIRM map for the project location. FEMA FIRM Panel 06077CO28OF with an effective date of October 16,2009 does not show a floodway having been calculated or designated at the Project location(See Attached FIRMette). The Project is located within a Zone AE(Static Elevation 9). A review of the effective Flood Insurance Study(FIS)Report for San Joaquin County(06077CV00I13, 06077CV002B, &06077CV003B)further confirms that no floodway has been calculated or determined by FEMA for this project location. Furthermore,the effective hydraulic model for this location is a hydro-dynamic model(DWR's Delta RMA2 hydro-dynamic model). In order to determine if the Project location falls within the definition of a floodway under item(3),KSN reviewed the CVFPB's BAM Website',as to whether a Designated Floodway is shown at the project location.A https://gis.bam.water.ca.gov/bam/ Lat/Long 38.10178, -121.48907 Corporate Office: 711 N Pershing Avenue I Stockton,CA 95203 1 209-946-0268 1 w m.ksninc.com West Sacramento: 1550 Harbor Boulevard,Suite 212 1 West Sacramento CA 95691 916-403-5900